Donna
What Donna filed with TWDB about the water it produced and the water it billed for, 2015–2023 — and what the filing does and does not let anyone verify.
- Non-revenue water, FY2023
- 34.5% Computed from filed system input and billed consumption.
- system input volume 738.3 sheet 2023, cell AP323 · converted to million gallons from the unit the filing states
- billed authorized consumption 483.3 sheet 2023, cell AU323 · converted to million gallons from the unit the filing states
- Annual value of the filed loss
- $283,000 Apparent loss is valued at this utility's own reported retail price of water, and real loss at its own reported variable production cost. Not our estimate, and shown to three significant figures.
- cost of apparent losses, as filed 55,097 sheet 2023, cell CD323 · republished only where the retail price it implies is one a utility could charge
- cost of real losses, as filed 227,664 sheet 2023, cell CH323 · republished only where the production cost it implies is one a utility could incur
- Apparent loss that is a default
- 10.8%
- apparent loss 22.3 sheet 2023, cell BL323 · converted to million gallons from the unit the filing states
2026-08-11-7270fa7072e5.xlsx2023 AP323agency source
Where this figure comes from
(system input − billed authorized) ÷ system input × 100
Read from data/archive/twdb/2026-08-11-7270fa7072e5.xlsx (SHA-256 7270fa7072e51e70), our archived copy of the file as it stood on 2026-08-11. That path is committed to the repository and is not served here. The agency publishes its own current copy at https://www.twdb.texas.gov/conservation/data/doc/water-loss-data/sources/historical-water-loss-audit-data.xlsx, which may since have been revised.
2026-08-11-7270fa7072e5.xlsx2023 CD323agency source
Where this figure comes from
cost of apparent losses + cost of real losses, both as computed in the filed audit
Read from data/archive/twdb/2026-08-11-7270fa7072e5.xlsx (SHA-256 7270fa7072e51e70), our archived copy of the file as it stood on 2026-08-11. That path is committed to the repository and is not served here. The agency publishes its own current copy at https://www.twdb.texas.gov/conservation/data/doc/water-loss-data/sources/historical-water-loss-audit-data.xlsx, which may since have been revised.
MeasuredTWDB default
2026-08-11-7270fa7072e5.xlsx2023 BL323agency source
Where this figure comes from
defaulted apparent-loss components ÷ total apparent loss × 100
Read from data/archive/twdb/2026-08-11-7270fa7072e5.xlsx (SHA-256 7270fa7072e51e70), our archived copy of the file as it stood on 2026-08-11. That path is committed to the repository and is not served here. The agency publishes its own current copy at https://www.twdb.texas.gov/conservation/data/doc/water-loss-data/sources/historical-water-loss-audit-data.xlsx, which may since have been revised.
What the filing says
Donna serves 5,767 retail connections and about 17,600 people. Because it reports more than 3,300 connections, it is on an annual water loss audit cycle with TWDB.
What the record shows
34.5% non-revenue water in FY2023, higher than 86% of the 785 Texas systems that filed that year.
- The figure is improving across the record.
It does not establish what moved. A meter replacement program, a main break, a change of billing system, a corrected prior-year filing and an ordinary reporting error all produce a series that looks like this, and a filed water loss audit does not say which happened. What the flag does say is that the years disagree with each other by more than most of the state's do, so a single year of this series is a weak basis for a decision without the records behind it.
Compliance record
18 violations on EPA's record for this system as of 2026Q2, of which 6 are health-based. 11 resolved, 6 archived, and 1 still open.
- Notification, Known or Potential LSL unaddressed, from July 2, 2025
Counted as distinct violations, not as rows: EPA's export carries one row per enforcement action taken against a violation, so a row count would multiply this system's record several times over. A violation here is a breach of a reporting, monitoring or contaminant-level rule as reported to EPA — it is not a measurement of the water, and this site has none.
Source: US EPA, Safe Drinking Water Information System, via the ECHO national download, 2026Q2. How we hold it.
TWDB derives water losses from system input minus authorized consumption, so these parts sum to the whole on every filing. What a filing can get wrong is which of these numbers were measured.
Where these volumes come from
- System input 738.3 MG sheet 2023, cell AP323 · converted to million gallons from the unit the filing states
- Billed authorized 483.3 MG sheet 2023, cell AU323 · converted to million gallons from the unit the filing states
- Unbilled authorized 13.8 MG computed here, not read from a cell
- Apparent loss 22.3 MG sheet 2023, cell BL323 · converted to million gallons from the unit the filing states
- Real loss 218.9 MG sheet 2023, cell BQ323
From data/archive/twdb/2026-08-11-7270fa7072e5.xlsx (SHA-256 7270fa7072e51e70), retrieved 2026-08-11 from the published source.
| Year | NRW | Input (MG) | Recoverable |
|---|---|---|---|
| 2023 | 34.5% | 738.3 | $283,000 |
| 2022 | 28.2% | 739.9 | $243,000 |
| 2021 | 13.1% | 654.8 | $117,000 |
| 2020 | 19.7% | 648 | $147,000 |
| 2018 | 27.3% | 650.8 | $197,000 |
| 2017 | 38.4% | 600.7 | $248,000 |
| 2016 | 40.0% | 611.5 | $200,000 |
| 2015 | 30.1% | 579.8 | $120,000 |
Balance closure is inapplicable on every filed year above, so the column that repeated it is not shown. TWDB derives water losses from system input minus authorized consumption, so this decomposition holds by construction. This is neither a pass nor a disclosure gap.
How much of this figure was measured
Apparent loss is three components: customer meter inaccuracy, unauthorized consumption, and data handling error. TWDB supplies a default value for the last two when a utility does not measure them, and records which in its export. Across the published record, unauthorized consumption is a default on 95% of filings, data handling error on 30%. The median filing is 14.4% defaulted, and 1,329 filings are more than half. TWDB's own data-validity score averages 68.4 out of 100 on the 9,315 filings using a default, against 70.0 on the 429 using none — so the score does not tell the two apart.
10.8% of Donna's reported apparent loss for FY2023 is a default rather than a measurement. How much of a Texas loss figure is measured sets this out across the whole filed record.
How the loss is valued
Apparent loss is water that reached a customer and was never billed: under-registering meters, data-handling errors, unauthorized use. It is valued here at the retail rate, because water that reached a customer would have sold at that rate. Real loss is valued at variable production cost only, since eliminating a leak saves what it cost to treat and pump the water rather than what it would have sold for. Valuing both at the retail rate is how a loss study produces a number nobody in a finance department believes, and that is the mistake this figure is built to avoid.
This is the value of the loss, not an amount anyone has established is recoverable. How much of it a utility can actually collect depends on which meters are under-registering, which accounts are unbilled, and what a replacement or an audit of those accounts would cost. None of that is in a filed water loss audit, and this page does not claim to know it.
Apparent loss is valued at this utility's own reported retail price of water, and real loss at its own reported variable production cost. Not our estimate, and shown to three significant figures.
Comparable systems
In the same county.
| System | Basis for comparison | NRW |
|---|---|---|
| Mercedes | HIDALGO County | 11.0% FY2024 |
| Hidalgo | HIDALGO County | 28.2% FY2024 |
| San Juan | HIDALGO County | 21.2% FY2024 |
| Hidalgo County MUD 1 | HIDALGO County | 32.5% FY2024 |
| Elsa | HIDALGO County | 41.5% FY2024 |
| Alamo | HIDALGO County | 15.8% FY2024 |
| La Joya | HIDALGO County | 12.3% FY2024 |
| Military Hwy Water Supply Corp Progreso | HIDALGO County | 26.4% FY2015 |
Where is it going?
This page values the loss at roughly $283,000 a year. It cannot say which accounts, which zones, or which meters, and it cannot say how much of that value is collectable. Answering either takes your billing history, your meter reads, and your production data reconciled against each other.
Our Water Loss Recovery Snapshot is three weeks, one flat fee, and the deliverable is a ranked list of specific accounts and zones with dollars and a confidence on each.
See what the Snapshot delivers Email us about DonnaSources and corrections. Every figure above is either filed by the utility or computed from filed figures, and each one says which. If a number here looks wrong, tell us: the error may be in the filing, in our reading of it, or in something the export does not show. Send a correction. We will check it against the source, correct the page where it is wrong, and say what changed.
- Texas Water Development Board — historical water loss audit data. Retrieved 2026-08-11 from data/archive/twdb/2026-08-11-7270fa7072e5.xlsx. https://www.twdb.texas.gov/conservation/data/doc/water-loss-data/sources/historical-water-loss-audit-data.xlsx