What was found in League City'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 | 1055.5 µg/L 11% of the EPA limit 10000 µg/L Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Nitrate-Nitrite | 1039 µg/L 10% of the EPA limit 10000 µg/L Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2015 | 1/1 | SYR4 |
| Fluoride | 890 µg/L 22% of the EPA limit 4000 µg/L Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Copper | 725.2 µg/L 56% of the EPA limit 1300 µg/L Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2018 | 1/1 | SYR4 |
| Barium | 183.5 µg/L 9.2% of the EPA limit 2000 µg/L Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Nitrite | 92 µg/L 9.2% of the EPA limit 1000 µg/L Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 57.775 µg/L 96% of the EPA limit 60 µg/L Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| TTHM | 53.85 µg/L 67% of the EPA limit 80 µg/L Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 42.175 µg/L No EPA limit set Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Chloroform | 41.72 µg/L No EPA limit set Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Lead | 16 µg/L 107% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2018 | 1/1 | SYR4 |
| Lithium | 15.5 µg/L No EPA limit set Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2025 | 1/1 | UCMR-5 |
| Bromodichloromethane | 15.375 µg/L No EPA limit set Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 15.1 µg/L No EPA limit set Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Bromoform | 14.635 µg/L No EPA limit set Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 10.36 µg/L No EPA limit set Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Xylenes, Total | 8.53 µg/L 0.1% of the EPA limit 10000 µg/L Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 8 µg/L No EPA limit set Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Gross Beta Particle Activity | 6.57 pCi/L No EPA limit set Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 4.225 µg/L No EPA limit set Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Arsenic | 2.2 µg/L 22% of the EPA limit 10 µg/L Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Ethylbenzene | 1.94 µg/L 0.3% of the EPA limit 700 µg/L Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 1.475 pCi/L 30% of the EPA limit 5 pCi/L Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 1.2 µg/L No EPA limit set Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Toluene | 0.6000 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Atrazine | 0.2940 µg/L 9.8% of the EPA limit 3 µg/L Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Simazine | 0.1745 µg/L 4.4% of the EPA limit 4 µg/L Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Hexachlorocyclopentadiene | 0.1200 µg/L 0.2% of the EPA limit 50 µg/L Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2019 | 1/1 | SYR4 |
| Pfpea | 0.1020 µg/L No EPA limit set Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2025 | 1/1 | UCMR-5 |
| Pfba | 0.0319 µg/L No EPA limit set Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2025 | 1/1 | UCMR-5 |
| Pfhxa | 0.0071 µg/L No EPA limit set Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2025 | 1/1 | UCMR-5 |
| PFOS | 0.0048 µg/L No EPA limit set Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2025 | 1/1 | UCMR-5 |
| PFHXS | 0.0045 µg/L No EPA limit set Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2025 | 1/1 | UCMR-5 |
| PFBS | 0.0041 µg/L No EPA limit set Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2025 | 1/1 | UCMR-5 |
| Lead | 0.0030 mg/L 20% of the EPA limit 0.0150 mg/L Main supplier: CITY OF LEAGUE CITY · 149,557 people · 2024 | 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 League City
| Supplier | Population served |
|---|---|
| CITY OF LEAGUE CITY | 149,557 |
Frequently asked questions about League City tap water
Is League City tap water safe to drink?
EPA testing detected 35 contaminants in the water serving League City. 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 League City?
1 public water supplier report drinking-water monitoring for League City, Texas to the EPA. Each is listed above with its population served.
What contaminants are in League City's water?
The contaminants EPA monitoring detected in League City 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.