What Is Groundwater Monitoring? A Complete Guide

Groundwater monitoring is the systematic measurement of groundwater levels and groundwater quality over time, undertaken to manage groundwater resources, satisfy regulatory approvals and protect nearby assets and ecosystems. In Australia, groundwater accounts for 30% of national water consumption, supplying mines, towns, irrigators and groundwater-dependent ecosystems across every state and territory. When groundwater conditions change – whether through abstraction, contamination or climate – the consequences for project safety, environmental compliance and water supply can be significant.

This guide focuses on practical, engineering-led groundwater monitoring solutions: how monitoring systems are designed, what instrumentation is available, how data accuracy is maintained, and how automated data collection reduces risk for mining, civil infrastructure and environmental projects. Monitel is a Western Australian engineering firm that designs and operates automated groundwater monitoring systems across these sectors, producing defensible datasets that support long-term groundwater management and regulatory reporting. Automated monitoring supports compliance with Western Australian legislation and provides continuous visibility that manual programs cannot match.

What is groundwater and why does it need to be monitored?

Groundwater is water stored in the pores and fractures of soil, rock and sediment beneath the earth’s surface. It accumulates in geological formations known as aquifers, where groundwater flow moves slowly under the influence of hydraulic gradients – sometimes only metres per year. Unlike surface water, groundwater is largely invisible, making direct observation impossible without purpose-built monitoring infrastructure.

Australia depends heavily on groundwater sources. According to Geoscience Australia, groundwater comprises around 17% of accessible water resources but contributes roughly 30% of total water consumption nationally. In Perth, groundwater provides about 40% of the city’s total water supply, drawn primarily from the Gnangara and Jandakot groundwater mounds. Groundwater systems are vital for supporting ecosystems such as wetlands and native vegetation, and groundwater sustains local wetlands and urban ecosystems which rely on sufficient water levels beneath the water table.

Groundwater abstraction must be carefully managed to avoid long-term depletion and ecological damage. The Department of Water and Environmental Regulation oversees groundwater resources in Western Australia, and monitoring allows authorities to set groundwater allocation limits for sustainable extraction. Monitoring also helps regulators set and manage water licenses to prevent over-extraction. As rainfall patterns shift, monitoring has become critical in Perth due to declining rainfall and changing climate conditions, and groundwater monitoring plays a pivotal role in managing the effects of climate change on water resources across the continent. Without systematic water resource management and ongoing monitoring, there is no reliable basis for managing groundwater supply, protecting ecosystems or planning new infrastructure.

What is groundwater monitoring? (definition, scope and objectives)

Groundwater monitoring is the ongoing measurement and analysis of groundwater levels, pressures and groundwater quality parameters to understand aquifer behaviour, detect change and support engineering and environmental decisions. Monitoring focuses on tracking physical water levels and chemical quality over time – covering both quantity (hydraulic head, depth to water, flow direction, abstraction rates) and quality (pH, electrical conductivity, salinity, temperature, dissolved oxygen, turbidity, metals, nutrients, organic compounds, and biological indicators such as e coli).

Typical monitoring objectives include:

  • Assessing impacts of mine dewatering on surrounding aquifers and neighbouring bores
  • Verifying drawdown predictions against approved hydrogeological models
  • Protecting groundwater-dependent ecosystems from adverse changes in water levels or quality
  • Identifying potential contaminants and contamination pathways before they migrate offsite
  • Supporting closure planning and long-term water management strategies

Monitoring detects pollutants before they impact human health and economic activity. Groundwater monitoring is crucial for assessing contamination risks, and groundwater quality sampling helps manage the risk of contamination and safeguard drinking water supplies – including drinking water sources. Historical industrial activities can lead to groundwater contamination, making monitoring essential even on sites with no current operations. Groundwater monitoring assesses water quality and contamination risks across a wide range of water quality parameters, and monitoring data supports understanding the interaction between groundwater and any adjacent surface water body.

The critical role of defensible, audit-ready datasets cannot be overstated. Groundwater monitoring ensures compliance with environmental approvals, and groundwater monitoring data must meet Australian and ISO standards.

Groundwater monitoring methods and instrumentation

Instrumentation choice depends on project requirements: bore construction, expected groundwater levels, groundwater quality conditions, the range of parameters to be measured, and the required monitoring frequency. The following methods represent the core of most monitoring programs.

Monitoring wells and observation bores. Groundwater monitoring involves drilling boreholes for sample collection and water sampling. Monitoring wells collect groundwater samples for analysis, while observation wells monitor groundwater conditions without sampling. Wells are typically made of stainless steel or PVC, with screened intervals placed at specific depths within the target aquifer. Proper sealing outside the screen (using bentonite or cement) prevents cross-contamination between geological layers. Borehole networks are vital for capturing background conditions and detecting environmental impacts across a site.

Piezometers. Piezometers measure pore water pressure in the ground and are widely used around embankments, tailings dams and tunnel excavations. Vibrating wire piezometers convert pressure into electrical signals, offering low drift, long service life and suitability for deep installations. Standpipe piezometers provide a simpler, lower-cost option for shallow applications where manual measurement is acceptable.

Submersible level transmitters. Slim-line hydrostatic probes designed for small-diameter boreholes measure depth to water and groundwater levels with high resolution. Typical specifications include diameters as small as 17 mm, accuracy of ±0.25% full scale, and pressure ranges suitable for bores from a few metres to over 250 m depth. Vented vs non-vented cable designs and cable materials are selected based on bore depth, salinity and required longevity.

Water quality sensors. Multi-parameter sondes allow continuous in-situ measurement of pH, temperature, electrical conductivity, dissolved oxygen, turbidity and total dissolved solids. Groundwater monitoring includes using multi-parameter probes to test health markers like pH and salinity. Field measurements can include flow, temperature, and oxygen concentration. These sensors are valuable for early warning of tailings seepage or contaminated groundwater plumes.

Manual methods. Electric water level tapes, bailers, grab sampler devices, submersible pumps and low-flow sampling equipment remain important. Low-flow groundwater sampling generates minimal purged water volume, helping to obtain a representative sample without excessive disturbance. Spot sampling and collecting samples manually is still appropriate for baseline programs, periodic compliance checks, and verification of automated sensor outputs. Each water sample must be collected using protocols that determine contamination risk and ensure defensibility. Advanced methods such as Electrical Resistivity Tomography are also used as a form of remote sensing to map subsurface water distribution, complementing direct borehole data. Even sediment and particles in bore water can influence sensor readings, so careful sample collection and bore development are essential.

The role of dataloggers, telemetry and automated groundwater monitoring solutions

Many Australian mines and infrastructure projects now prefer automated monitoring over purely manual programs. The drivers are straightforward: safety, cost, data frequency and increasingly strict regulatory expectations.

Dataloggers record groundwater levels and quality at fixed intervals – typically every 5 to 15 minutes – creating high-resolution time series that capture transient responses to rainfall, pump starts and dewatering operations. This process produces far richer datasets than periodic manual readings, enabling engineers and hydrogeologists to make informed decisions based on actual aquifer behaviour rather than snapshots. Automatic samplers can collect samples continuously or at set intervals, further reducing reliance on manual site visits.

Monitel designs telemetry systems using GSM/4G, satellite or UHF radio, selected based on the remoteness of borefields, available power (solar or mains), and how critical real-time data is to operations. Automated systems enable real-time tracking of groundwater levels using telemetry and sensors. Telemetric systems reduce site visits and improve data collection frequency and reliability, which is particularly valuable for remote tailings dams, deep borefields or confined spaces where sending personnel poses significant safety risks and high labour costs.

Data is pushed to cloud platforms or secure servers, where dashboards display current water levels, trends and alarm status. When thresholds are exceeded, automated alerts notify responsible engineers immediately. Continuous monitoring reduces the risk of regulatory breaches by eliminating data gaps that manual programs inevitably produce. Monitel typically designs end-to-end groundwater monitoring solutions – from borehole instrumentation through to telemetry and reporting – tailored to each project’s specific requirements rather than offering a one-size-fits-all package.

Data accuracy: corrections, calibration and defensible groundwater datasets

High-quality groundwater data is not optional. Poor-quality data can be more expensive than quality instrumentation once re-drilling, re-sampling and regulatory risk are factored in. Measurements taken over long periods are only valuable if they are accurate and consistently corrected.

The main factors affecting groundwater level accuracy for hydrostatic probes include:

  • Temperature effects: Electronics and materials respond to temperature changes, causing zero-offset drift or sensitivity shifts. Sensors with built-in thermistors allow compensation, but without correction, fluid temperature variation can introduce systematic error.
  • Barometric pressure: Non-vented sensors measure absolute pressure, which includes atmospheric fluctuations. Without barometric compensation – using vented cables or a separate barometric sensor – diurnal atmospheric pressure swings can produce false water level variations. For example, an uncorrected transducer in a shallow bore might show apparent water level changes of 5–10 mm that are entirely atmospheric, potentially triggering false alarms or misrepresenting drawdown.
  • Density / salinity corrections: Hydrostatic pressure depends on fluid density. In saline aquifers, coastal bores or near tailings seepage, salinity variation changes the density of the water column. Without density correction, measured pressure head does not accurately represent true water level elevation.
  • Sensor drift and cable stretch: Over time, sensors may drift from their calibrated baseline. Deep installations may also experience cable elongation under weight, affecting depth referencing.

Calibration and verification practices include factory calibration certificates, field checks against manual water level tape readings, and periodic validation of water quality sensors using reference standards. Monitel’s engineering team documents metadata rigorously – sensor type, serial numbers, bore construction details, datum references such as Top of Casing and metres above Australian Height Datum – so that groundwater levels and pore pressures can be audited, replicated in models and defended during regulatory review.

Regulatory drivers, risk reduction and practical applications in Australia

Groundwater monitoring is linked directly to approvals under the Environmental Protection Act, the EPBC Act and state water licensing regimes. Regulators increasingly expect continuous, defensible monitoring data rather than periodic manual snapshots. Groundwater monitoring is essential for environmental compliance in mining and across major infrastructure projects, and it helps determine suitable locations for new bores and guides urban development in water-sensitive areas.

The main risk drivers for Monitel’s clients include:

  • Regulatory non-compliance and legal penalties: Gaps or delays in data collection can breach strict approval conditions, leading to fines, enforcement action or project shutdowns. Automated monitoring directly addresses this by producing continuous, audit-ready datasets.
  • Geotechnical instability and construction delays: In complex projects – for example, tunnel excavations in coastal environments – unexpected changes in pore water pressure or groundwater levels can compromise structural safety. Real-time monitoring provides the immediate data needed to manage dewatering and prevent costly construction failures.
  • Safety risks and labour costs: Sending personnel to remote or hazardous locations such as tailings dams or deep bore fields is expensive and poses significant safety risks. Automated platforms eliminate the need for frequent site visits by transmitting high-frequency data directly to the cloud.

Practical applications undertaken across Australian sites include monitoring drawdown around open pits and underground mines, tracking pore water pressures near tunnel drives, and monitoring seepage and groundwater levels around tailings dams and embankments. Early-warning triggers and alarm thresholds are set in automated systems to notify engineers when conditions approach critical limits – enabling timely, proactive water management rather than reactive reporting. Comprehensive monitoring networks with multiple bores at varying depths provide the spatial coverage needed to validate numerical models used in project approvals and ongoing operation.

Monitel’s engineering approach to groundwater monitoring systems

Monitel works as an engineering partner rather than a hardware reseller. The company’s involvement typically spans the full project lifecycle:

  1. Design: Reviewing approval conditions, hydrogeological models and site constraints to design the monitoring network – bore locations, depths, screen intervals and instrument selection. This includes choosing between submersible level transmitters, vibrating wire piezometers and water quality sondes based on what the project actually requires.
  2. Installation and commissioning: Coordinating with drilling contractors, ensuring correct sensor placement and datum referencing (TOC, mAHD), performing initial manual readings to verify sensor outputs, and establishing baseline data collection before operations begin.
  3. Long-term performance: Remote system diagnostics, routine sensor checks, data validation workflows, and support for clients’ hydrogeologists during reporting cycles and audits.

In one mining project, Monitel deployed approximately sixty CT2X sensors across a 50 km plain for a salt and potash operation, continuously measuring conductivity, temperature, salinity, total dissolved solids and pressure. Real-time data from this network enabled the client to detect environmental changes early and demonstrate regulatory compliance across multiple reporting periods – replacing what would have been an impractical manual sampling program.

At the Alkimos Desalination Plant, Monitel installed vibrating wire piezometers at multiple locations to monitor moisture, settlement and pore water pressure during pre-loading and early construction phases. Real-time pore pressure data underpinned safe dewatering decisions and helped avoid schedule delays during a technically demanding coastal tunnel and infrastructure project.

Monitel’s value lies in producing accurate, actionable groundwater data that supports engineering and environmental decisions – not merely installing sensors.

Planning a groundwater monitoring program for your project

For engineers, hydrogeologists and environmental managers planning or upgrading a monitoring network, the following steps provide a practical framework:

  • Define objectives clearly: Is the program designed for compliance, dewatering control, impact assessment, or contamination detection? Objectives drive every subsequent design decision.
  • Review regulatory conditions: Understand what approvals require – monitoring frequency, parameters, trigger values, reporting format and data standards.
  • Understand hydrogeological context: Review existing bore logs, aquifer properties and baseline data. Identify which aquifers are at risk and where groundwater-dependent ecosystems or neighbouring users may be affected.
  • Select suitable instrumentation: Choose between standpipes, vibrating wire piezometers and submersible level transmitters based on bore diameter, depth, expected conditions and required accuracy. Decide whether continuous water quality monitoring is warranted at selected locations.
  • Plan for operational practicalities: Consider access and safety at bore locations, power and telemetry coverage, data ownership and security, and integration with existing site data systems or cloud platforms.

Engaging specialist support early in the design process reduces the risk of installing instrumentation that does not meet project or regulatory requirements. Monitel is available to review proposed designs, advise on instrumentation selection, and develop automated groundwater monitoring solutions tailored to each site’s specific groundwater monitoring needs.

To discuss groundwater monitoring for an upcoming or existing project in mining, infrastructure or environmental management, contact Monitel to speak with our engineering team about designing a monitoring solution matched to your site conditions and regulatory requirements.

Groundwater Monitoring Methods: Manual vs Remote Groundwater Monitoring Systems

Groundwater monitoring is essential for assessing aquifer health, meeting environmental compliance obligations, and supporting operational decisions across mining, infrastructure, and environmental projects. This article compares manual and remote groundwater monitoring systems, examining their costs, accuracy, data frequency, and suitability for different project requirements. The focus is on continuous reporting technologies that reduce manpower costs and deliver higher-quality datasets – an area where Monitel provides end-to-end groundwater monitoring solutions across Western Australia and beyond.

Introduction to Groundwater Monitoring

By definition, groundwater monitoring encompasses both quantity monitoring – tracking groundwater levels, hydraulic head, and water table fluctuations – and groundwater quality assessment of parameters such as pH, conductivity, dissolved oxygen, and chemical contaminants. Together, these measurements form a comprehensive picture of aquifer behaviour over time.

Groundwater levels can be monitored manually or automatically. Manual approaches rely on field visits with handheld instruments, while remote monitoring systems use permanently installed sensors, data loggers, and telemetry to collect and transmit data continuously. Monitel operates as an engineering partner across the full monitoring lifecycle: selecting suitable instrumentation, designing the system, installing and commissioning equipment, and providing long-term support to produce audit-ready datasets.

Why Monitor Groundwater Resources and Water Resources

Groundwater is an important source of water across Australia. Groundwater accounts for 30% of Australia’s water consumption, and groundwater underpins nearly 70% of water used in Perth, necessitating monitoring to protect this resource. Springs, wetlands, and river baseflow all depend on stable groundwater levels, and over-abstraction can lead to land subsidence, saltwater intrusion, and ecological damage.

Regulatory drivers are tightening. Australian frameworks such as the non-urban water metering and telemetry framework (MAF2:2026) now mandate accurate meters and telemetry across water basins. In Western Australia, guidelines for groundwater monitoring in the onshore petroleum and geothermal industry require effective monitoring to demonstrate ongoing protection and groundwater management. Groundwater monitoring is essential for compliance with environmental regulations, and poor monitoring can lead to project delays, enforcement action, and costly remedial works.

From an operational perspective, groundwater monitoring contributes to risk management during construction and excavation. It helps protect ecosystems by maintaining stable water levels. Regular groundwater monitoring supports sustainable water resource management and helps prevent contamination from entering the food chain. Groundwater monitoring systems also support drought impact tracking and aquifer recharge assessment, and monitoring identifies and manages contaminant plumes in redevelopment areas.

Manual Groundwater Level Monitoring Methods

Manual monitoring uses a dipper to measure groundwater levels – typically an electric water level sounder or weighted tape lowered into a monitoring well. The operator records depth to water (DTW) from a fixed reference point, usually the top of casing (TOC). Manual methods are straightforward and require low capital investment, but they are labour intensive, producing only periodic snapshots of site conditions.

Field safety and access requirements add cost and complexity. Crews must travel to remote areas, sometimes over difficult terrain in harsh environments, carrying equipment and PPE. For networks spanning dozens of bores, manual visits consume significant travel time and resources. Monitoring wells are drilled to access aquifers at various depths, and each well requires a scheduled visit.

The frequency of manual groundwater level monitoring is typically weekly or monthly – rarely more frequent. This means transient events such as rainfall response, pumping cycles, or tidal effects are routinely missed.

Field Procedures for Manual Groundwater Level Monitoring

A standard manual dipper measurement follows these steps:

  1. Arrive at the monitoring well and confirm well identifier and location.
  2. Inspect the TOC – ensure it is clean, undamaged, and surveyed relative to a vertical datum (e.g. mAHD in Australia).
  3. Lower the calibrated dipper or electric probe into the bore until contact with the water surface is detected.
  4. Record DTW from the TOC reference, noting the measurement in metres to millimetre precision where required.
  5. Log the date, time, personnel, instrument serial number, calibration status, and weather conditions.

Site visits should follow a schedule determined by risk and regulatory requirements. All measurements should be recorded in a consistent format – whether paper-based or digital – and entered into a central database. Access to groundwater is typically achieved through specially designed boreholes and wells, and consistent notation of TOC elevation is critical for long-term trend analysis.

Manual Groundwater Water Quality Sampling

Water samples are periodically collected from monitoring wells to test for contaminants. The standard grab-sampling process involves:

  • Purging the well (typically three to five well volumes, or until field parameters such as temperature, pH, and conductivity stabilise).
  • Collecting samples in appropriate containers (amber glass, HDPE) using clean equipment.
  • Deploying field blanks and duplicates for QA/QC.

Sample preservation requires acidification or cool storage at 4°C depending on the analyte. Chain-of-custody documentation must record who collected the sample, the time, container type, sample ID, transport conditions, and laboratory receipt. Laboratories accredited to standards such as NATA in Australia typically report results within days to weeks. For a deeper comparison of grab sampling and continuous monitoring approaches, the article Grab Sampling vs Continuous Monitoring – What’s the Difference provides useful context.

Remote and Automated Groundwater Level Monitoring Systems

Automated systems provide continuous monitoring of groundwater levels, capturing data at intervals from minutes to hours. This high-frequency data reveals transient events that manual methods miss entirely – pumping drawdown curves, tidal influence, storm recharge, and seasonal trends all become visible.

Automated systems transmit groundwater data remotely to databases, eliminating the need for routine field visits. Alarm thresholds can be configured to notify engineers immediately when groundwater levels breach critical limits, enabling faster response. Automated monitoring reduces the need for manual site visits, improving safety and freeing field staff for higher-value work.

Instrumentation for an Automated Groundwater Monitoring System

Several sensor types form the backbone of automated groundwater monitoring systems:

  • Vibrating wire piezometers (VWPs): Closed-system sensors where pressure changes alter the tension of a vibrating wire, shifting its resonant frequency. VWPs offer long-term stability with precision around 0.02 psi (approximately 5 mm of water head) and minimal drift. They are commonly deployed in deep boreholes and geotechnical applications.
  • Submersible pressure transducers: Diaphragm-based sensors immersed below the water surface, measuring hydrostatic head. Widely used for groundwater level monitoring in shallow to moderate-depth bores. They require correction for temperature and barometric pressure to deliver accurate readings.
  • Multi-parameter sondes: Instruments that combine level measurement with groundwater quality parameters – pH, electrical conductivity, dissolved oxygen, turbidity, and temperatures. These are particularly suitable for projects requiring integrated quantity and quality monitoring.

Barometric compensation is essential. Atmospheric pressure fluctuations affect all non-vented pressure sensors, and without correction, apparent water level changes can be artefacts of weather rather than genuine aquifer response. Temperature corrections account for fluid density variations, which is especially important in coastal, brackish, or mining-affected groundwater.

Telemetry, Data Acquisition and Level Monitoring

Telemetry transmits data from field sensors to a central platform. Common options include:

Technology

Best Suited For

Power Requirements

GSM / 4G cellular

Sites with mobile coverage

Moderate

NB-IoT / LTE Cat-M1

Low-power, wide-area deployments

Low (multi-year battery life)

Satellite

Off-grid or very remote areas

Moderate to high

Radio (UHF/VHF)

Short-range, line-of-sight

Low to moderate
GSM telemetry enables real-time data collection for groundwater monitoring where cellular coverage exists. For remote areas without network coverage, satellite telemetry provides reliable connectivity. NB-IoT devices can operate on a single battery for multiple years depending on sampling and transmission intervals.

Data loggers in automated systems store thousands of samples with time-stamped metadata, providing backup if telemetry drops out. Secure cloud dashboards with role-based access allow engineers to visualise hydrographs, configure alarms, and export data for regulatory reporting. Real-time alarms can be delivered via SMS, email, or app notifications, with redundancy across multiple channels for critical thresholds.

Continuous Reporting and Monitel’s Monitoring System Approach

Monitel’s approach centres on continuous reporting technologies that automate the entire data chain – from sensor to cloud to report. Rather than simply supplying equipment, Monitel selects instrumentation based on site-specific hydrogeology, installs and commissions the system, configures telemetry and alarms, and provides ongoing calibration and support.

The manpower savings are substantial. Published case studies show remote monitoring can reduce field visits from 26 per year to just 2, cutting operational costs by more than 90% while increasing data points from approximately 24 to over 1,400 per year per monitoring point. In one mining example, remote monitoring replaced weekly site visits entirely, reducing costs by over 80% with satellite communications costing less than US$30 per month and payback achieved in under three months.

The resulting datasets are audit-ready: consistently time-stamped, linked to sensor calibration records, and stored with full metadata. This is a significant compliance advantage in an environment where regulators increasingly demand telemetry and validated metering.

Cost, Accuracy and Compliance Comparison

Factor

Manual Monitoring

Remote / Automated Monitoring

Capital cost

Low (dipper, tape, PPE)

Moderate to high (sensors, logger, telemetry)

Annual operating cost per site

$1,200–$4,800 (weekly visits)

~$981 (annualised hardware + telemetry)

Data frequency

Weekly to monthly

Minutes to hourly

Data points per year

~24–52

>1,400–525,600

Typical accuracy

±5–10 mm (operator and instrument dependent)

±3–5 mm (pressure transducer, with corrections)

Transient event detection

Unlikely

High probability

Compliance suitability

Periodic records only

Continuous, defensible time-series
The cost figures above draw on published analyses from California’s GWO network, where the annualised cost of a remote telemetry system was approximately $981 per site compared with $1,200–$4,800 for weekly manual measurement. Daily manual measurements can exceed $33,600 per site annually.

Accuracy improvements with automated sensors are well-documented. Vibrating wire transducers tested over 100-day periods demonstrated precision within 0.02 psi (approximately 5 mm) with drift below 0.05 psi, whereas manual methods are typically limited to ±5–10 mm depending on the operator and instrument condition.

For compliance, automated datasets with continuous time-series, calibration metadata, and audit trails are far more defensible than periodic manual records. This aligns with Australian standards requiring pattern-approved meters and telemetry validation.

Implementation Best Practices for Groundwater Management and Monitoring

Effective implementation starts with understanding the hydrogeology. Consider aquifer type (confined or unconfined), expected fluctuation range, water chemistry, and fouling potential before selecting instrumentation. Material selection – stainless steel, titanium, or polymer housings – should reflect the chemical environment.

Bore installation and well completion must follow established standards: appropriate diameter, filter pack, annular seal, casing, screen selection, and a sanitary cap. Survey the TOC elevation relative to the Australian Height Datum. Groundwater monitoring involves drilling boreholes for water testing, and proper construction ensures sensor response is representative of aquifer conditions.

Calibration and verification schedules should include:

  • Factory calibration prior to deployment
  • Field verification at installation against a manual reference reading
  • Annual recalibration or per manufacturer specifications
  • Periodic cross-checks using manual dipper measurements

Barometric and density correction procedures must be applied consistently. Install a barometric sensor at each site or use vented probes. Account for water density variations caused by temperature and salinity – particularly in coastal or mining-affected settings.

Maintain regular data validation workflows: review outliers, inspect cables and sensor surfaces, confirm telemetry link integrity, and record all maintenance activities with dates and personnel.

Common Challenges for Groundwater Monitoring Systems and Mitigations

Challenge

Mitigation

Sensor fouling (biofilm, silt, scale)

Regular cleaning, filter guards, anti-fouling coatings, automated wiper systems

Power supply in remote areas

Long-life lithium batteries, solar panels with charge controllers, low-power NB-IoT telemetry

Data gaps from telemetry failures

On-board flash storage in data loggers, redundant communication paths (cellular + satellite)

Regulator acceptance of automated data

Maintain raw data with full metadata, calibration certificates, time stamps, and audit trails
Power supply is a common constraint for bores located far from mains electricity. Modern NB-IoT sensors with optimised sleep modes can operate for years on a single battery, making them well suited to large monitoring networks across the country.

Case Studies and Use Cases for Groundwater Level Monitoring

WA Utilities dewatering monitoring: The Alkimos Seawater Desalination Plant (ASDP) involves complex marine and tunnelling works in highly permeable soils. Construction of deep intake and outfall tunnels requires significant dewatering to manage high internal pressures and ensure the stability of structures like the “peanut shaft”. Monitoring must cover groundwater levels to manage dewatering effects and track potential noise/vibration impacts from piling works that could affect the surrounding community and marine environment.

We are providing automated, high-precision instrumentation (such as hydrostatic level transmitters) to allow the construction alliance to maintain real-time visibility over the aquifer’s response to dewatering, ensuring the project stays within its Public Environmental Review and Construction Environmental Management Framework guidelines.

Civil infrastructure – excavation dewatering: On urban construction projects near sensitive infrastructure, real-time groundwater level monitoring detects unsafe drawdown before it causes settlement damage. High-frequency data allows contractors to adjust dewatering rates within hours rather than waiting for the next manual reading.

Groundwater Quality Monitoring Integration

Modern multi-parameter sondes integrate water quality sensors with level measurement in a single deployment. This ensures temporal alignment between quantity and quality data – critical for understanding how aquifer recharge or pumping events affect water chemistry.

Groundwater quality monitoring assesses pH, conductivity, and dissolved oxygen, along with turbidity, redox potential, and temperature. Groundwater can be contaminated by pesticides and heavy metals from agriculture, industry, or legacy soil contamination, and contaminant detection involves tracking pollutants from landfills or industrial activities. Groundwater monitoring can prevent contamination from agricultural pesticides and can identify risks to local ecosystems and drinking water.

Quality sensors require more frequent calibration than level sensors – typically every three to six months. QA/QC routines should include field blanks, duplicate samples, cross-calibration during maintenance visits, and verification against laboratory-tested grab samples. Additionally, sensors should be stored and transported according to manufacturer specifications to maintain accuracy.

FAQs: Groundwater Level Monitoring and Monitoring System Selection

Is manual monitoring more accurate than automated monitoring?

Not necessarily. Manual readings are subject to tape sag, operator error, and inconsistent reference points, typically achieving ±5–10 mm accuracy. Well-calibrated pressure transducers with barometric compensation routinely achieve ±3–5 mm. The key difference is that automated sensors deliver this accuracy continuously, whereas manual readings provide only a snapshot tested at one moment in time.

How reliable is telemetry, and how long do batteries last?

Modern NB-IoT and LTE Cat-M1 devices are designed for multi-year battery life – some manufacturers specify seven to ten years depending on sampling and transmission frequency. Cellular telemetry is reliable where network coverage exists; satellite telemetry serves areas without coverage. On-board data loggers store collected samples as backup, so temporary communication losses do not result in data gaps.

How does Monitel ensure data integrity and calibration records?

Monitel maintains full traceability from sensor to report. Each sensor is factory-calibrated with certificates recorded in the data platform. Field verification at installation confirms performance against manual reference readings. Calibration history, sensor serial numbers, barometric and density corrections, and all maintenance events are logged as metadata alongside raw data. This produces defensible, audit-ready datasets that satisfy regulatory requirements. Groundwater monitoring is essential for informed management decisions, and reliable data underpins every engineering strategy.

Next Steps

Selecting the right groundwater monitoring approach depends on your site conditions, regulatory obligations, population of monitoring points, and long-term data requirements. Whether you need to observe water table behaviour during dewatering, assess aquifer recharge, manage contamination risk, or report continuously for environmental approvals, the monitoring system should be designed around the specific problem.

Speak with Monitel’s team to discuss your groundwater monitoring requirements and develop a solution tailored to your site. Contact Monitel to get started.