# Apparent loss URL: https://municorn.us/glossary/apparent-loss/ Updated: 2026-08-09 Apparent loss is water that was delivered, consumed, and never invoiced. The water did its job; the accounting failed. It is the only component of water loss that converts to cash without capital work, and it is the one most utilities cannot quantify because it requires comparing three systems that do not talk to each other. ## Where it comes from - **Meter under-registration.** A mechanical meter that reads low bills low forever. Age is the parameter everyone models, and it is not the only one that matters — service pressure and cumulative throughput both move registration accuracy materially, which means a pressure-zone adjustment can restate a loss attribution more than a decade of ageing does. - **Data handling.** The gap between what the meter recorded and what the bill charged: dropped reads replaced by estimates that never get trued up, wrong multipliers, stale winter averages, rate misclassification, accounts flagged inactive that are still consuming. - **Unauthorized consumption.** Unpermitted connections, tampering, construction draw from an unmetered hydrant. ## Why it is usually modeled rather than measured The AWWA audit framework treats apparent loss as a modeled quantity and assigns the whole audit a qualitative validity score rather than a quantified uncertainty band. So a filed apparent-loss figure is typically an assumption about meter accuracy multiplied by a volume, not a measurement. That distinction decides whether a finding is worth acting on. A modeled share of a balance is a budgeting input. A specific address with a read history and a discriminating test behind it is a collectible. Only the second one belongs on an invoice, and it is the only kind we will put a contingency fee on. ## The reconciliation that finds it Meter reads against billing records against production totals against the service inventory. Each pair disagrees for a different reason, and the pattern of disagreement is what identifies the cause: an account with consumption and no bill is a different problem from a meter whose reads flatline, which is different again from a premise the billing system does not know exists. --- # Non-revenue water URL: https://municorn.us/glossary/non-revenue-water/ Updated: 2026-08-09 Non-revenue water is everything that entered a distribution system and produced no bill. It is not the same as leakage, and treating the two as synonyms is the most expensive vocabulary error in the sector. ## The four components A water audit divides system input into four parts, and the division is the whole point: - **Billed authorized consumption** — water that reached a customer and appeared on an invoice. - **Unbilled authorized consumption** — firefighting, main flushing, municipal use. Real water, deliberately not billed. - **Apparent loss** — water that reached a customer and was never billed. Under-registering meters, data-handling errors between the meter and the bill, unauthorized connections. - **Real loss** — water that never reached a customer. Leaks, main breaks, storage overflows. Non-revenue water is the last three added together. That sum is a useful headline and a useless action item, because the three have nothing in common operationally. ## Why the split decides what you do about it Apparent loss is a revenue problem. The water was delivered and consumed; only the billing failed. Recovering it means fixing meters and billing records, it shows up in the next cycle, and it needs no capital budget. Real loss is a cost problem. The water never reached anyone, so there is no invoice to recover — eliminating it saves what it cost to treat and pump, not what it would have sold for. Fixing it means finding and repairing pipe, which is a capital program on a multi-year horizon. A study that values both at the retail rate produces a number two to four times too large, which is why finance directors have learned to discount loss studies on sight. ## What a percentage does not tell you A ten percent loss rate on a system selling 20 billion gallons a year is worth far more than a thirty percent rate on one selling 200 million. Percentages rank systems by how bad they look; dollars rank them by what is worth doing. Recoverable dollars is the only ordering that maps onto a decision. --- # Real loss URL: https://municorn.us/glossary/real-loss/ Updated: 2026-08-09 Real loss is physical: water that entered the system and left it through a hole. Background leakage too small to surface, reported breaks, unreported breaks running until someone notices, storage tank overflows. ## How to value it At variable production cost — chemicals, power, purchased water — not at the retail rate. Stopping a leak does not create an invoice; it stops you paying to treat and pump water nobody receives. On most systems the variable cost is a quarter to a fifth of the retail rate, which is why the valuation choice changes a headline figure by a factor of four. The exception is a system at its supply limit, where avoided real loss defers a capital project or a purchased-water contract. There the right price is the marginal cost of the next increment of supply, and it can exceed the retail rate. That is a case to argue explicitly, per system, not a default. ## Why the reported number is soft Most filed real-loss figures are residuals: system input minus everything else the utility could account for. Anything mis-stated elsewhere in the balance lands here. That makes real loss simultaneously the largest number in many audits and the least independently verified one. It is also why a balance that does not close matters. If the components do not sum to the reported system input, the unexplained volume is sitting in a category the audit does not name — and the real-loss line, being the residual, is where a reader will wrongly assume it went. ## Finding it Night-flow analysis by district metered area, acoustic survey, pressure-transient work, and district-level mass balance over long windows. All of it presupposes that the zone boundaries in the GIS match the valves in the ground, which on most systems is an assumption nobody has tested. --- # Unaccounted-for water (UAW) URL: https://municorn.us/glossary/unaccounted-for-water/ Updated: 2026-08-09 Unaccounted-for water is the metric Massachusetts uses. MassDEP requires municipal public water suppliers averaging 100,000 gallons a day or more to calculate UAW and residential gallons per capita per day in the Annual Statistical Report filed through eDEP, and both are Water Management Act performance standards tied to withdrawal permitting. ## Not interchangeable with non-revenue water UAW is a subtraction: system input minus everything the supplier can account for, including authorized unbilled uses it can document. Non-revenue water under the AWWA framework is a decomposition into named components with an uncertainty attached to each. The practical difference is what happens to a volume you can explain but cannot prove. Under UAW, documented estimated municipal use comes out of the numerator — and MassDEP's own instructions are explicit that use claimed without attached documentation is counted as unaccounted-for. So the metric rewards recordkeeping as well as tight pipe, and two suppliers with identical physical losses can file materially different UAW. Comparing a Massachusetts UAW figure to a Texas non-revenue water figure without saying which is which produces a ranking that means nothing. Our state pages keep them separate and label them. ## Verify the threshold before you cite one The numeric performance standards attach to permits and are revised. If you are about to tell a board it is over its standard, get the current number from MassDEP with a date on it. Being right about the direction and wrong about the threshold is worse than saying nothing. --- # How the water loss index is built URL: https://municorn.us/methodology/water-loss-index/ Updated: 2026-08-09 The index is built from filings utilities submit to their own state regulator. Nothing here is a survey, an estimate of an estimate, or a proprietary normalization. Every figure is either as-filed or computed from as-filed values, and every page says which. ## Sources **Texas.** Water loss audits filed with the Texas Water Development Board. A retail public water utility with more than 3,300 connections, or with an active financial obligation to TWDB, files annually; below that threshold, every five years. Since January 2025, utilities with an active obligation or applying for financial assistance must also have the audit validated, so an unvalidated recent audit is itself a flag we display. **Massachusetts.** Unaccounted-for water and residential gallons per capita per day as published by MassDEP from Annual Statistical Reports, required of municipal suppliers averaging 100,000 gallons a day or more. Presentation scale is detected per file and normalized on ingest. Every volume in the index is million gallons. This sounds pedantic and it is the single most common transcription error in regulator exports. ## The closure check A water audit is an identity, not an opinion: system input = billed authorized + unbilled authorized + apparent loss + real loss We evaluate it on every filing that publishes all five terms, with a tolerance of 0.5 percent of system input to absorb rounding in the filed figures. Three verdicts, never two: - **closed** — the components sum to reported input within tolerance. - **failed** — they do not, and we state the signed residual in million gallons and as a share of input. That volume is either mis-stated or sitting in a category the audit does not name. - **insufficient** — the filing does not publish enough terms to evaluate the identity at all. The third verdict is the reason this index is worth reading. A check that cannot fail is not a check, and a system that reports an unevaluable filing as passing is worse than one that reports nothing. Most filings land here, because published summaries commonly carry totals and percentages rather than the components a balance is made of. We name which terms were missing. Do not aggregate `insufficient` with `closed`. In the bulk data they are separate values for exactly this reason. ## The recoverable figure Apparent loss is valued at the retail rate, because it is water that reached a customer and was never invoiced — revenue, recoverable inside a budget year, no capital work. Real loss is valued at variable production cost, because stopping a leak saves treatment and pumping, not retail price. Where a filing carries no retail rate, a state median is substituted and the figure is marked **modeled** everywhere it appears, including in the CSV. Where a filing publishes total loss without splitting apparent from real, the whole volume is valued at variable cost and labelled as a deliberate floor — the revenue portion cannot be estimated without the split. A recoverable figure is an order of magnitude, not a collections target. It says whether the problem is worth an afternoon or a quarter. Which accounts, which zones, and which meters requires your billing history, your meter reads, and your production data reconciled against each other, and no public filing contains that. ## What we do not do We do not rank by loss percentage. A small percentage on a large system is worth more than a large percentage on a small one, and percentage rankings punish small rural systems for arithmetic. We do not recompute a utility's filed figures to make them close. If a filing does not balance, the page says so and shows the residual. Adjusting inputs until an identity holds is how a check becomes decoration. We do not publish a figure we cannot source. An absent value renders as an em dash, never as a zero. ## Corrections If a number here is wrong, it is wrong in the filing or wrong in our reading of it. Both are worth knowing. Email ammar@municorn.us with the system and the year; we correct the page and note what changed and when. --- # Reporting Sprint URL: https://municorn.us/services/reporting-sprint/ Updated: 2026-08-09 Somewhere in your organization a person spends the last week of every month or quarter assembling a report by hand from four systems. That person is usually the one you most need thinking about something else. ## What we do Pick one report. A state submittal, a council packet, a grant draw request, a monthly operating report, an annual water loss audit. We trace every figure in it to the record it comes from, build the assembly once, and hand you something that produces the report on a schedule. The tracing is most of the work and it is the part with the durable value. It is common for this exercise to establish that two figures in the same report have been derived from the same underlying number by two different methods for years, and that nobody knew because nobody had cause to look. ## What you get The report, produced. The assembly, documented, with each figure tied to its source system and field. A list of the places where the source data cannot actually support the figure the form asks for — which is a compliance finding worth having in writing before an auditor produces it for you. ## Why this one is often first It needs no capital budget, it does not touch a system of record, and it frees a specific named person's specific named week. That makes it the easiest thing in this list to approve and the fastest to demonstrate. It also puts us inside the data long enough to see what else is wrong, which is usually how the next conversation starts. --- # Water Loss Recovery Snapshot URL: https://municorn.us/services/water-loss-recovery-snapshot/ Updated: 2026-08-09 Your filed audit says how much water you lost. It cannot say where it went, and no filing can, because the answer is not in the audit — it is in the disagreement between three systems that do not talk to each other. ## What we do We take read-only extracts of your billing history, your meter reads or AMI interval data, your production and district-level flow records, and your service inventory. Then we reconcile them against each other and against your own filed balance, and we work the disagreements. Each pair of systems disagrees for a different reason, and the pattern identifies the cause. An account consuming with no bill is not the same problem as a meter whose reads flatline, which is not the same as a premise your billing system does not know exists, which is not the same as a rate class applied to the wrong customer. ## What you get A ranked list. Each row is a specific account, address or zone, with a dollar figure, the cause, the test that identified it, and a confidence. Every row you can act on this quarter is separated from every row that belongs in a capital plan. Plus the reconciliation itself, as a spreadsheet you keep, with the queries behind it — so your staff can re-run it next quarter without us. ## What we will not do We will not hand you a modeled share of a water balance and call it recoverable revenue. A finding that goes on this list is measured: an account with a read history and a discriminating test behind it. Modeled components are reported separately and labelled, because a contingency fee on a modeled number is a number nobody can collect. We will not tell you the answer is a new system. Sometimes it is. Usually the data to find the money is already in systems you are paying for. ## Fit Best fit: a retail water utility with billing data in an ERP or CIS, meter reads in an AMI or AMR headend, and someone in finance who has wondered why production and billing do not track. Roughly 3,000 connections and up, though the reconciliation works at any size — below that the recoverable amount usually does not justify the engagement, and we will say so on the call. Poor fit: if your meter reads are on paper cards, the first project is getting them into a system, and that is a different and larger conversation we are happy to have. ## Why the price is fixed Because an hourly engagement gives us a reason to take longer and gives you a reason to scope it down, and neither serves the finding. Three weeks, one number, and the deliverable is defined above rather than in a change order. ---