What was found in Diana's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Fluoride | 764.3 µg/L 19% of the EPA limit 4000 µg/L Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Copper | 538.4 µg/L 41% of the EPA limit 1300 µg/L Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Nitrate-Nitrite | 455.25 µg/L 4.6% of the EPA limit 10000 µg/L Main supplier: DIANA SUD · 7,320 people · 2015 | 1/1 | SYR4 |
| Nitrate | 430 µg/L 4.3% of the EPA limit 10000 µg/L Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Nitrite | 126 µg/L 13% of the EPA limit 1000 µg/L Main supplier: DIANA SUD · 7,320 people · 2015 | 1/1 | SYR4 |
| Cyanide | 59.98 µg/L 30% of the EPA limit 200 µg/L Main supplier: DIANA SUD · 7,320 people · 2017 | 1/1 | SYR4 |
| Barium | 45.28 µg/L 2.3% of the EPA limit 2000 µg/L Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 44.79 µg/L 75% of the EPA limit 60 µg/L Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| TTHM | 44.03 µg/L 55% of the EPA limit 80 µg/L Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Chloroform | 33.1 µg/L No EPA limit set Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 30.17 µg/L No EPA limit set Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 24.82 µg/L No EPA limit set Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 23 µg/L No EPA limit set Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Lithium | 18 µg/L No EPA limit set Main supplier: DIANA SUD · 7,320 people · 2025 | 1/1 | UCMR-5 |
| Trichloroacetic Acid | 13.275 µg/L No EPA limit set Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Gross Beta Particle Activity | 5.38 pCi/L No EPA limit set Main supplier: DIANA SUD · 7,320 people · 2018 | 1/1 | SYR4 |
| Bromoform | 5.104 µg/L No EPA limit set Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 4.68 µg/L No EPA limit set Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Chromium | 3.5005 µg/L 3.5% of the EPA limit 100 µg/L Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.3 pCi/L 22% of the EPA limit 15 pCi/L Main supplier: DIANA SUD · 7,320 people · 2018 | 1/1 | SYR4 |
| Selenium | 3.12 µg/L 6.2% of the EPA limit 50 µg/L Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 2.76 pCi/L 55% of the EPA limit 5 pCi/L Main supplier: DIANA SUD · 7,320 people · 2018 | 1/1 | SYR4 |
| Dibromoacetic Acid | 2.47 µg/L No EPA limit set Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Lead | 1.868 µg/L 12% of the EPA limit 15 µg/L Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Arsenic | 1.14 µg/L 11% of the EPA limit 10 µg/L Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 1 µg/L No EPA limit set Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Thallium, Total | 0.7700 µg/L 39% of the EPA limit 2 µg/L Main supplier: DIANA SUD · 7,320 people · 2019 | 1/1 | SYR4 |
| Pfba | 0.0054 µg/L No EPA limit set Main supplier: DIANA SUD · 7,320 people · 2025 | 1/1 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: DIANA SUD · 7,320 people · 2025 | 1/1 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Diana
| Supplier | Population served |
|---|---|
| DIANA SUD | 7,320 |
Frequently asked questions about Diana tap water
Is Diana tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Diana. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Diana?
1 public water supplier report drinking-water monitoring for Diana, Texas to the EPA. Each is listed above with its population served.
What contaminants are in Diana's water?
The contaminants EPA monitoring detected in Diana include Fluoride, Copper, Nitrate-Nitrite, Nitrate, Nitrite. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.