A water audit is a measured account of where an organisation's water comes from, where it is used and where it is lost, ending in a water balance and a list of ways to save. It is a technical audit, usually done by qualified engineers or accredited agencies. A financial or compliance auditor checks the bills, permits and costs around it, not the flow measurements.
Last reviewed: 17 October 2026. Facts checked. We ran web searches on water audit rules. The results pointed to the Central Ground Water Authority (CGWA) SOP, a Lok Sabha answer and Central Water Commission guidelines. We tried to open all three, and every attempt failed with a connection error, so we did not open any authority page. The points attributed to them below come from search result summaries only. We give no thresholds or deadlines, because we could not confirm them.
What a water audit is
It is a structured study of water use. The auditor maps sources and uses, measures flows, builds a balance of water in against water out, and finds losses and savings. The result is a report with numbers and recommendations.
Search results indicate the Central Water Commission has published general guidelines on water audit and water conservation, and that the Ministry of Jal Shakti said states handle water audits. We could not open the documents to confirm details. A separate search result describes CGWA rules asking certain groundwater-using industries for audits by accredited agencies. We could not confirm the scope, the frequency or the cut-offs, so check the CGWA's current guidelines if you extract groundwater.
Scope
| Area | Typical questions |
|---|---|
| Sources | Municipal supply, borewell, tanker, rainwater, recycled water |
| Uses | Process, cooling, cleaning, drinking, gardening, sanitation |
| Distribution | Pipes, tanks, valves, meters |
| Wastewater | Volume, treatment, reuse, disposal |
| Losses | Leaks, overflow, unmetered use, evaporation |
| Management | Metering, logs, targets, responsibility |
Steps
- Agree the scope and objective. Is it for a regulator, a lender or internal savings?
- Collect documents. Bills, meter readings, site drawings, borewell details, treatment plant records.
- Walk the site. Trace the water from inlet to drain.
- Measure. Use installed meters or portable flow meters. Note where there are no meters.
- Build the water balance. Total inflow should equal consumption plus losses plus outflow. Gaps point to leaks or unmetered use.
- Find losses and options. Fix leaks, reuse treated water, change fittings or processes.
- Report. State findings, evidence, savings and cost to implement.
- Follow up. Track actions and re-measure.
What is measured
- Volume in from each source, per day and per month.
- Volume used by each section, if metered or estimated.
- Wastewater generated and treated.
- Water used per unit of output, such as per tonne, per room or per student, so you can compare periods.
- Losses, shown as a share of inflow.
- Quality parameters where treatment or reuse is involved, tested by an accredited laboratory.
Estimates should be labelled as estimates. A balance built on guesses will not survive questions.
Who does the audit
Engineers, hydrologists or specialist agencies. If a regulator requires the report, ask that regulator whom it accepts. Do not assume. Our guides to environmental audit and energy audit follow a similar pattern.
What a financial or compliance auditor checks around it
- The engagement letter, the credentials of the agency and the fee booked.
- Water bills, tanker invoices and borewell costs against the water balance. Large unexplained gaps can point to unmetered use or unrecorded purchases.
- Whether permits for groundwater use or discharge exist where the entity's operations need them. Name the permit from the regulator's current list.
- Capital spend on water saving, such as treatment plants, and whether it is capitalised correctly.
- Whether management acted on recommendations and recorded savings.
- Any statements in sustainability or annual reports about water use, matched to the data. See BRSR and ESG internal audit.
Templates: the environmental, health and safety audit checklist can be adapted for permits and records.
Short checklist
- Purpose and reader of the report confirmed.
- Twelve months of water bills and meter logs gathered.
- Site map showing every source, meter and outlet.
- Meter calibration status noted.
- Wastewater treatment and reuse records collected.
- Permits listed with validity dates.
- Action plan with owner and date.
Frequently Asked Questions
What is a water audit?
A measured study of water sources, uses and losses, ending in a water balance and recommendations.
Is a water audit mandatory?
Not for everyone. Search results suggest CGWA asks certain industries that use groundwater for audits. We could not confirm the thresholds, so check the regulator.
What is a water balance?
It is the accounting of water in against water used, lost and discharged. The totals should agree. Gaps show where to look.
Who can do a water audit?
Qualified engineers or agencies. If a regulator needs the report, ask whom it accepts.
Can a CA firm do a water audit?
The measurement is technical and is not a CA's work. A CA firm can review costs, permits, controls over bills and reported numbers around it.
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