Compliance record
Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.
4
health-based violations
33
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Resolved | 2005-12-01 → 2005-12-31 |
| MCL | Health-based | Resolved | 2005-12-01 → 2005-12-31 |
| MCL | Health-based | Resolved | 2005-12-01 → 2005-12-31 |
| MCL | Health-based | Resolved | 2005-12-01 → 2005-12-31 |
| Other | Monitoring | Resolved | 2016-06-10 |
| Other | Monitoring | Resolved | 2016-06-10 |
| MR | Monitoring | Resolved | 2016-02-01 → 2016-02-29 |
| MR | Monitoring | Resolved | 2016-02-01 → 2016-02-29 |
| MR | Monitoring | Resolved | 2016-02-01 → 2016-02-29 |
| MR | Monitoring | Resolved | 2016-02-01 → 2016-02-29 |
PFAS detected
PFAS are industrial “forever chemicals”. These are the EPA's latest
nationwide test results (2023–2025).
Other contaminants detected
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 this
system's samples — over 100% is worth reading, but is not by itself a
violation. Where a single sample came in higher than that percentile, it
is noted under the bar. Formal violations are listed separately.
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 2440 µg/L 24% of the EPA limit 10000 µg/L
worst single sample: 3140 µg/L | 644/660 | SYR4 | 2012–2019 |
| Dibromochloromethane | 22.07 µg/L No EPA limit set
worst single sample: 34.1 µg/L | 567/728 | SYR4 | 2012–2019 |
| Bromoform | 8.245 µg/L No EPA limit set
worst single sample: 14.6 µg/L | 532/728 | SYR4 | 2012–2019 |
| Bromodichloromethane | 23.8 µg/L No EPA limit set
worst single sample: 31.5 µg/L | 513/728 | SYR4 | 2012–2019 |
| TTHM | 72.65 µg/L 91% of the EPA limit 80 µg/L
worst single sample: 106 µg/L | 487/506 | SYR4 | 2012–2019 |
| Chloroform | 25.1 µg/L No EPA limit set
worst single sample: 51.2 µg/L | 448/728 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 18.9 µg/L 32% of the EPA limit 60 µg/L
worst single sample: 34.6 µg/L | 436/506 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 6.6 µg/L No EPA limit set
worst single sample: 9.5 µg/L | 421/506 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 9.8 µg/L No EPA limit set
worst single sample: 19.6 µg/L | 378/506 | SYR4 | 2012–2019 |
| Copper | 289 µg/L 22% of the EPA limit 1300 µg/L
worst single sample: 469 µg/L | 366/401 | SYR4 | 2012–2018 |
| Trichloroacetic Acid | 5.6 µg/L No EPA limit set
worst single sample: 12.9 µg/L | 230/506 | SYR4 | 2012–2019 |
| Lead | 6.178 µg/L 41% of the EPA limit 15 µg/L
worst single sample: 16.3 µg/L | 144/401 | SYR4 | 2012–2018 |
| Nitrate-Nitrite | 2369 µg/L 24% of the EPA limit 10000 µg/L
worst single sample: 2680 µg/L | 132/135 | SYR4 | 2012–2019 |
| Barium | 115.7 µg/L 5.8% of the EPA limit 2000 µg/L
worst single sample: 199 µg/L | 103/103 | SYR4 | 2012–2019 |
| Fluoride | 834 µg/L 21% of the EPA limit 4000 µg/L
worst single sample: 950 µg/L | 93/96 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 1.775 µg/L No EPA limit set
worst single sample: 5.1 µg/L | 46/506 | SYR4 | 2012–2019 |
| Lithium | 25.5 µg/L No EPA limit set | 36/82 | UCMR-5 | 2025 |
| Lead | 0.0016 mg/L 11% of the EPA limit 0.0150 mg/L | 15/15 | LCR | 2024 |
| Combined Radium (-226 And -228) | 2.532 pCi/L 51% of the EPA limit 5 pCi/L
worst single sample: 2.61 pCi/L | 14/18 | SYR4 | 2012–2019 |
| Xylenes, Total | 3.5555 µg/L 0% of the EPA limit 10000 µg/L
worst single sample: 3.9 µg/L | 14/250 | SYR4 | 2012–2019 |
| Gross Alpha, Excl. Radon And U | 5.245 pCi/L 35% of the EPA limit 15 pCi/L
worst single sample: 5.3 pCi/L | 12/56 | SYR4 | 2013–2019 |
| Monochloroacetic Acid | 2.85 µg/L No EPA limit set
worst single sample: 3 µg/L | 11/506 | SYR4 | 2012–2019 |
| Combined Uranium | 1.3 µg/L 4.3% of the EPA limit 30 µg/L | 8/56 | SYR4 | 2013–2019 |
| Gross Beta Particle Activity | 11.525 pCi/L No EPA limit set
worst single sample: 11.7 pCi/L | 8/65 | SYR4 | 2012–2019 |
| Selenium | 4.36 µg/L 8.7% of the EPA limit 50 µg/L
worst single sample: 4.5 µg/L | 8/103 | SYR4 | 2012–2019 |
| Tetrachloroethylene | 0.9675 µg/L 19% of the EPA limit 5 µg/L
worst single sample: 1 µg/L | 6/250 | SYR4 | 2012–2019 |
| Di(2-ethylhexyl) Phthalate | 6.74 µg/L 112% of the EPA limit, at the 95th percentile of samples — 6 µg/L
worst single sample: 7.7 µg/L | 4/138 | SYR4 | 2012–2019 |
| Dichloromethane | 1.27 µg/L 25% of the EPA limit 5 µg/L
worst single sample: 1.3 µg/L | 3/250 | SYR4 | 2012–2019 |
| Chromium | 4.146 µg/L 4.1% of the EPA limit 100 µg/L
worst single sample: 4.15 µg/L | 2/103 | SYR4 | 2012–2019 |
| Ethylbenzene | 0.6920 µg/L 0.1% of the EPA limit 700 µg/L
worst single sample: 0.7000 µg/L | 2/250 | SYR4 | 2012–2019 |
| 2,4-D | 0.1000 µg/L 0.1% of the EPA limit 70 µg/L | 1/102 | SYR4 | 2013–2019 |
| Cadmium | 3.4 µg/L 68% of the EPA limit 5 µg/L | 1/103 | SYR4 | 2012–2019 |
74 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCarbofuranCarbon TetrachlorideChlordaneDalaponDi(2-ethylhexyl) AdipateDinosebEthylene DibromideEndrinHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about San Antonio Water
Is San Antonio Water tap water safe to drink?
EPA monitoring detected 35 contaminants in San Antonio Water's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.
What contaminants were detected in San Antonio Water's water?
EPA monitoring detected Nitrate, Dibromochloromethane, Bromoform, Bromodichloromethane, TTHM, and others. The full list with the level and data source for each is above.
How many people does San Antonio Water serve?
San Antonio Water reports serving 2,643,729 people in Texas, per its EPA record.
Has San Antonio Water had any water quality violations?
The EPA has 33 violations on file for San Antonio Water, of which 4 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.
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.