What was found in The Colony'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 |
|---|---|---|---|
| Nitrate | 1241.5 µg/L 12% of the EPA limit 10000 µg/L Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Nitrate-Nitrite | 1215.5 µg/L 12% of the EPA limit 10000 µg/L Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Fluoride | 733.5 µg/L 18% of the EPA limit 4000 µg/L Main supplier: CITY OF THE COLONY · 45,367 people · 2018 | 1/1 | SYR4 |
| Copper | 303 µg/L 23% of the EPA limit 1300 µg/L Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Barium | 78.1 µg/L 3.9% of the EPA limit 2000 µg/L Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Lithium | 76.6 µg/L No EPA limit set Main supplier: CITY OF THE COLONY · 45,367 people · 2023 | 1/1 | UCMR-5 |
| Cyanide | 48.14 µg/L 24% of the EPA limit 200 µg/L Main supplier: CITY OF THE COLONY · 45,367 people · 2017 | 1/1 | SYR4 |
| TTHM | 36.05 µg/L 45% of the EPA limit 80 µg/L Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 28.475 µg/L 47% of the EPA limit 60 µg/L Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Chloroform | 20.9 µg/L No EPA limit set Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 19.525 µg/L No EPA limit set Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 9.665 µg/L No EPA limit set Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Bromoform | 9.048 µg/L No EPA limit set Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 5.847 µg/L No EPA limit set Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 5.825 µg/L No EPA limit set Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 5.2 µg/L No EPA limit set Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Lead | 4.73 µg/L 32% of the EPA limit 15 µg/L Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 3.655 µg/L No EPA limit set Main supplier: CITY OF THE COLONY · 45,367 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: CITY OF THE COLONY · 45,367 people · 2018 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 2.589 pCi/L 52% of the EPA limit 5 pCi/L Main supplier: CITY OF THE COLONY · 45,367 people · 2017 | 1/1 | SYR4 |
| Chromium | 2.56 µg/L 2.6% of the EPA limit 100 µg/L Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 2.2 µg/L No EPA limit set Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Selenium | 1.095 µg/L 2.2% of the EPA limit 50 µg/L Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.9000 µg/L 15% of the EPA limit 6 µg/L Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Arsenic | 0.8400 µg/L 8.4% of the EPA limit 10 µg/L Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Simazine | 0.1000 µg/L 2.5% of the EPA limit 4 µg/L Main supplier: CITY OF THE COLONY · 45,367 people · 2019 | 1/1 | SYR4 |
| Pfba | 0.0087 µg/L No EPA limit set Main supplier: CITY OF THE COLONY · 45,367 people · 2024 | 1/1 | UCMR-5 |
| Pfpea | 0.0076 µg/L No EPA limit set Main supplier: CITY OF THE COLONY · 45,367 people · 2024 | 1/1 | UCMR-5 |
| Pfhxa | 0.0075 µg/L No EPA limit set Main supplier: CITY OF THE COLONY · 45,367 people · 2024 | 1/1 | UCMR-5 |
| PFBS | 0.0041 µg/L No EPA limit set Main supplier: CITY OF THE COLONY · 45,367 people · 2024 | 1/1 | UCMR-5 |
| Lead | 0.00062 mg/L 4.2% of the EPA limit 0.0150 mg/L Main supplier: CITY OF THE COLONY · 45,367 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 The Colony
| Supplier | Population served |
|---|---|
| CITY OF THE COLONY | 45,367 |
Frequently asked questions about The Colony tap water
Is The Colony tap water safe to drink?
EPA testing detected 31 contaminants in the water serving The Colony. 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 The Colony?
1 public water supplier report drinking-water monitoring for The Colony, Texas to the EPA. Each is listed above with its population served.
What contaminants are in The Colony's water?
The contaminants EPA monitoring detected in The Colony include Nitrate, Nitrate-Nitrite, Fluoride, Copper, Barium. 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.