What was found in Tomball'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 | 750 µg/L 19% of the EPA limit 4000 µg/L Main supplier: CITY OF TOMBALL · 17,532 people · 2017 | 4/4 | SYR4 |
| Copper | 551.5999999999999 µg/L 42% of the EPA limit 1300 µg/L Main supplier: CITY OF TOMBALL · 17,532 people · 2017 | 4/4 | SYR4 |
| Barium | 317 µg/L 16% of the EPA limit 2000 µg/L Main supplier: CITY OF TOMBALL · 17,532 people · 2019 | 4/4 | SYR4 |
| Nitrate | 290 µg/L 2.9% of the EPA limit 10000 µg/L Main supplier: CITY OF TOMBALL · 17,532 people · 2019 | 3/4 | SYR4 |
| Nitrate-Nitrite | 268 µg/L 2.7% of the EPA limit 10000 µg/L Main supplier: CITY OF TOMBALL · 17,532 people · 2015
Highest in the city: 289 µg/L — PITCAIRN WSC · 238 people · 2015 | 3/4 | SYR4 |
| Lithium | 27.1 µg/L No EPA limit set Main supplier: CITY OF TOMBALL · 17,532 people · 2024 | 1/4 | UCMR-5 |
| TTHM | 12.7 µg/L 16% of the EPA limit 80 µg/L Main supplier: CITY OF TOMBALL · 17,532 people · 2019 | 2/4 | SYR4 |
| Lead | 12.1 µg/L 81% of the EPA limit 15 µg/L Main supplier: CITY OF TOMBALL · 17,532 people · 2017 | 4/4 | SYR4 |
| Gross Beta Particle Activity | 4.2 pCi/L No EPA limit set Main supplier: CITY OF TOMBALL · 17,532 people · 2017
Highest in the city: 4.8 pCi/L — VAN MANOR MOBILE HOME PARK · 333 people · 2017 | 2/4 | SYR4 |
| Chloroform | 1.56 µg/L No EPA limit set Main supplier: CITY OF TOMBALL · 17,532 people · 2019
Highest in the city: 4.359999999999999 µg/L — VAN MANOR MOBILE HOME PARK · 333 people · 2019 | 2/4 | SYR4 |
| Dibromochloromethane | 4.345 µg/L No EPA limit set Main supplier: CITY OF TOMBALL · 17,532 people · 2019 | 2/4 | SYR4 |
| Bromoform | 3.75 µg/L No EPA limit set Main supplier: CITY OF TOMBALL · 17,532 people · 2019 | 2/4 | SYR4 |
| Bromodichloromethane | 3 µg/L No EPA limit set Main supplier: CITY OF TOMBALL · 17,532 people · 2019 | 2/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 2.925 µg/L 4.9% of the EPA limit 60 µg/L Main supplier: CITY OF TOMBALL · 17,532 people · 2019 | 2/4 | SYR4 |
| Arsenic | 2.8 µg/L 28% of the EPA limit 10 µg/L Highest in the city: PITCAIRN WSC · 238 people · 2019 | 2/4 | SYR4 |
| Xylenes, Total | 2.6 µg/L 0% of the EPA limit 10000 µg/L Main supplier: CITY OF TOMBALL · 17,532 people · 2019 | 1/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 2.3 pCi/L 15% of the EPA limit 15 pCi/L Main supplier: CITY OF TOMBALL · 17,532 people · 2017 | 1/4 | SYR4 |
| Combined Radium (-226 And -228) | 2.26 pCi/L 45% of the EPA limit 5 pCi/L Main supplier: CITY OF TOMBALL · 17,532 people · 2016 | 2/4 | SYR4 |
| Trichloroacetic Acid | 1 µg/L No EPA limit set Main supplier: CITY OF TOMBALL · 17,532 people · 2019
Highest in the city: 2.17 µg/L — VAN MANOR MOBILE HOME PARK · 333 people · 2019 | 2/4 | SYR4 |
| Dibromoacetic Acid | 1.3599999999999999 µg/L No EPA limit set Main supplier: CITY OF TOMBALL · 17,532 people · 2019 | 1/4 | SYR4 |
| Dichloroacetic Acid | 1.0950000000000002 µg/L No EPA limit set Main supplier: CITY OF TOMBALL · 17,532 people · 2019
Highest in the city: 1.2 µg/L — VAN MANOR MOBILE HOME PARK · 333 people · 2019 | 2/4 | SYR4 |
| Benzene | 0.7000 µg/L 14% of the EPA limit 5 µg/L Main supplier: CITY OF TOMBALL · 17,532 people · 2019 | 1/4 | SYR4 |
| Ethylbenzene | 0.5000 µg/L 0.1% of the EPA limit 700 µg/L Main supplier: CITY OF TOMBALL · 17,532 people · 2019 | 1/4 | SYR4 |
| Lead | 0.0016 mg/L 11% of the EPA limit 0.0150 mg/L Main supplier: CITY OF TOMBALL · 17,532 people · 2023 | 4/4 | 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 Tomball
| Supplier | Population served |
|---|---|
| CITY OF TOMBALL | 17,532 |
| VAN MANOR MOBILE HOME PARK | 333 |
| PITCAIRN WSC | 238 |
| WINTERHAVEN SUBDIVISION | 138 |
Frequently asked questions about Tomball tap water
Is Tomball tap water safe to drink?
EPA testing detected 24 contaminants in the water serving Tomball. 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 Tomball?
4 public water suppliers report drinking-water monitoring for Tomball, Texas to the EPA. Each is listed above with its population served.
What contaminants are in Tomball's water?
The contaminants EPA monitoring detected in Tomball include Fluoride, Copper, Barium, Nitrate, 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.