Drinking water quality · 2024
· Verified
· PWSID TX0840007
What's in League City, TX tap water
1 contaminant in League City, TX's water sat at or above a federal limit, led by PFOS (Perfluorooctane sulfonic acid) at 1.2x the limit.
- !1 contaminant at or above a federal limit — worst is PFOS (Perfluorooctane sulfonic acid) at 1.2x
- !10 of 27 core regulated contaminants reported — 17 never appear in this report
- ✓No open federal violations
+How this score is calculated
Every system starts at 100. Points come off for measured levels, for the federal violation record, and for how much of the core regulated set the utility actually reported. All three inputs are the utility's own published numbers and EPA's own records.
- −15 contaminants at or above a federal limit
- −0 contaminants within 20% of a limit
- −0 open health-based violations
- −0 open monitoring / reporting violations
- −0 health-based violations resolved in the last 5 years
- −14 core regulated contaminants never reported (10/27)
A 90–100 · B 80–89 · C 70–79 · D 60–69 · F below 60. A system reporting under a third of the core set is capped at C however clean its numbers look — a short report is not a clean bill of health.
Full grading methodology, constant for constant →What to worry about
- PFOS (Perfluorooctane sulfonic acid)1.2× the federal limit4.8 ng/L · limit 4 ng/L
Linked to cancer, thyroid disease, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.
higher than 55% of U.S. systems
+16 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| Cyanide | 120 ug/L | 200 ug/L |
| TTHM | 23.3–47.6 ug/L | 80 ug/L |
| PFHxS (Perfluorohexane sulfonic acid) | 4.5 ng/L | 10 ng/L |
| Copper | 0.464 mg/L | 1.3 mg/L |
| Combined Radium | 1.5 pCi/L | 5 pCi/L |
| Lead | 0.003 mg/L | 0.015 mg/L |
| Nitrate | 1 mg/L | 10 mg/L |
| Fluoride | 0.3 mg/L | 4 mg/L |
| Simazine | 0.14 ug/L | 4 ug/L |
| Barium | 0.0482 mg/L | 2 mg/L |
| Xylenes | 0.0007 mg/L | 10 mg/L |
| Lithium | 23.8 ug/L | — |
| PFBA | 31.9 ng/L | — |
| PFHxA | 7.1000000000000005 ng/L | — |
| PFBS | 4.1000000000000005 ng/L | — |
| PFPeA | 102 ng/L | — |
What this report doesn't tell you
17 of the 27 contaminants a community water system normally reports do not appear anywhere in League City, TX's data. Absent is not the same as absent-from-the-water — it means nobody published a number.
+Full detail: PFAS testing, water source, historical monitoring, and the federal violation record
PFAS — EPA UCMR5 (2023–2025)
1 PFAS compound above EPA limits in League City, TX
The EPA finalized the first-ever federal drinking-water limits for six PFAS compounds in April 2024. These numbers come straight from EPA's UCMR5 lab dataset — every U.S. system serving more than 3,300 people tested every PFAS sample at an entry point to its distribution system. PFAS not listed below were either tested and not detected, or not yet sampled.
PFOS (Perfluorooctane sulfonic acid)
● Over EPA limit (1.2×)PFHxS (Perfluorohexane sulfonic acid)
● Below limitPFBA
● Detected (no federal limit)PFHxA
● Detected (no federal limit)PFBS
● Detected (no federal limit)PFPeA
● Detected (no federal limit)Where your water comes from · EPA SDWIS
League City, TX's drinking water comes from ground water, drawn from 7 sources.
Source
- 4 - GRISSOM RD / N WAYSIDE
- 2 - 516 3RD ST
- 3 - COUNTRYSIDE / 5929 FM 518 W
- SOUTH SHORE HARBOUR - 2800 FM 518 E
- + 3 more
Treatment
- PLANT - 4200 GRISSOM RD, LEAGUE CITY
- PLANT - 2050 DICKINSON AVE
- PLANT - COUNTRYSIDE / 5929 FM 518 W
- + 8 more
Distribution
Also buys water from CITY OF HOUSTON, GULF COAST WATER AUTHORITY TX CITY.
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.