WATER SERVICE PROVIDERS · GUIDE 04
How to find the losses a service provider can close without digging.
Every water provider knows it pumps more water than it bills for. Far fewer can say how much of the gap is water leaving through a broken pipe and how much is water that reached a paying household and was never charged for. The two problems look identical on the monthly report. They cost entirely different amounts to fix.
This matters because of how the loss is actually made up. The international standard water balance breaks non-revenue water into eight components. Five of them are records, policy, and process. Three of them are pipes. A provider that starts with the three is committing to excavation, metering equipment, and years of capital. A provider that starts with the five is committing to a customer register and a billing routine, and can often show a result inside one cycle.
The definition used across the sector comes from the standard water balance published by the International Water Association and the American Water Works Association. Non-revenue water is the volume of system input that does not produce revenue. It is the sum of unbilled authorized consumption, apparent losses, and real losses.
Stated as arithmetic, it is the water that enters the system minus the water that is billed for:
The definition matters more than it looks. A provider that measures only leakage is not measuring non-revenue water, and will report a number that no regulator or lender can compare with anyone else's.
The standard divides non-revenue water into eight components. Separating them is the whole diagnostic, because each one has a different owner, a different cost, and a different timescale.
Commercial and administrative, five components
Physical, three components
The last item in the commercial list is the one providers underestimate most. A connection that exists in the ground but not in the register is invisible to every report the provider produces. It does not appear as a loss, an arrear, or a customer. It appears as nothing at all, which is why it can persist for years.
The first measurement worth making needs no equipment. Count the service connections that physically exist in one zone, then count the active billing accounts in that same zone. The difference is revenue the provider is already supplying and has never charged for.
A worked example
The figures below are illustrative. They describe a scheme with 3,000 registered connections over one month, and are shaped to show how the arithmetic works rather than to represent any particular provider.
A provider that stops at 39% has a headline and no plan. Splitting the same 16,500 m³ into its components produces something a manager can assign:
Real losses are the largest single component, and they are also the slowest and most expensive to reduce. The four commercial components together come to 9,000 m³, more than half the total, and none of them requires breaking ground. At a tariff of 0.60 per cubic meter, the missing register entries alone are worth about 2,040 a month, or 24,000 a year, to a scheme of 3,000 connections.
Report the split, never the headline alone. A single non-revenue water percentage tells a board that something is wrong. The split tells the board which department owns it.
Non-revenue water on its own is a lagging figure and moves too slowly to manage against. Four figures together show whether the commercial side is improving while the physical work proceeds.
These four separate the two failures that a single number hides. A provider can bill accurately and collect badly, or collect everything it bills while billing half its customers. The responses are not related.
In mWater, the customer overview page carries total accounts receivable, collection rate, active customer accounts, and meters read in the last thirty days without configuration. Register completeness needs one addition, which is a count of connections from the asset register set against active accounts.
A figure that nobody owns does not change. For each of the four measures, the provider needs a person, a routine, and a record of what was done.
The World Bank sets this sequencing out in its Water Utility Turnaround Framework, which places commercial operations and technical operations alongside financial management, human resources, and strategy as areas a utility has to improve together. The framework is explicit that early, visible results build the credibility a longer program needs, and commercial losses are usually where those early results are available.
None of the above removes the need to deal with leakage. In the worked example, real losses were the single largest component, and in many networks they are larger still. The argument is about sequence, not substitution.
Commercial work funds physical work. Revenue recovered from a complete register and a working collection routine is revenue available for district metering, pressure management, and mains replacement. Providers that begin with capital works before fixing the register frequently find they cannot demonstrate a return, because the water they saved was water they were never billing for either.
The physical program also depends on records. Prioritizing mains replacement requires an asset register with age, material, and failure history. A provider that has mapped its network can rank pipe sections by how often they fail and how many customers each failure affects. A provider working from a dot map cannot.
Non-revenue water reduction is often presented as a multi-year capital program. The commercial half is not. A provider working steadily through the register can expect a recognizable sequence.
Report the four measures the same way each month from the beginning. A series that starts badly and improves is more useful to a board, a regulator, or a lender than a single good figure with no history behind it.
Before any program begins, record these for one zone and one month: system input volume, billed metered consumption, billed unmetered consumption, active accounts, connections counted on the ground, accounts read, amount billed, and amount collected.
Keep the same zone and the same definitions every month afterward. Comparability over time is worth more than precision in any single month, and a provider that changes its method mid-year loses both.
mWater holds the customer register, the meter readings, the tariffs, the billing and payment records, and the asset register on one platform, free to use, with unlimited users. Readings are collected offline in the field and synchronized when a connection is available, which is what makes a monthly reading round possible where coverage is poor.
Two sources underpin this guide, and both are worth reading in full before a program begins.
For comparison against other providers, the International Benchmarking Network for Water and Sanitation Utilities publishes indicators covering non-revenue water, metering practices, billing and collections, and financial performance.
This guide covers the loss. The others cover the category, the decision, the records, and the first month of operation.
Non-revenue water is system input minus billed authorized consumption, and the international standard splits it into eight components. Five are commercial and administrative, three are physical. Most providers can recover more revenue in the first year from a complete customer register, a reading round that finishes on time, and a collection routine, than from any capital works program they could fund in the same period. Measure the split, assign each component to a person, and report the same four figures every month.
mWater · Water service provider series