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
31
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Resolved | 1996-10-01 → 1996-12-31 |
| MCL | Health-based | Resolved | 1996-07-01 → 1996-09-30 |
| MCL | Health-based | Resolved | 1996-04-01 → 1996-06-30 |
| MCL | Health-based | Resolved | 1996-01-01 → 1996-03-31 |
| RPT | Monitoring | Resolved | 2025-07-02 |
| RPT | Monitoring | Resolved | 2025-07-02 |
| MR | Monitoring | Resolved | 2017-09-01 → 2017-09-30 |
| MR | Monitoring | Resolved | 2017-09-01 → 2017-09-30 |
| MR | Monitoring | Resolved | 2017-09-01 → 2017-09-30 |
| MR | Monitoring | Resolved | 2017-09-01 → 2017-09-30 |
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 |
|---|---|---|---|---|
| Chlorite | 697 µg/L 70% of the EPA limit 1000 µg/L
worst single sample: 940 µg/L | 436/440 | SYR4 | 2013–2019 |
| Bromoform | 31.455 µg/L No EPA limit set
worst single sample: 48.2 µg/L | 130/130 | SYR4 | 2012–2019 |
| Dibromochloromethane | 18.32 µg/L No EPA limit set
worst single sample: 34.7 µg/L | 130/130 | SYR4 | 2012–2019 |
| Bromodichloromethane | 7.68 µg/L No EPA limit set
worst single sample: 22.2 µg/L | 127/130 | SYR4 | 2012–2019 |
| TTHM | 57.81 µg/L 72% of the EPA limit 80 µg/L
worst single sample: 100 µg/L | 114/114 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 26.54 µg/L 44% of the EPA limit 60 µg/L
worst single sample: 31.8 µg/L | 114/114 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 18.205 µg/L No EPA limit set
worst single sample: 20 µg/L | 112/114 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 6.1 µg/L No EPA limit set
worst single sample: 20.3 µg/L | 111/114 | SYR4 | 2012–2019 |
| Copper | 81.685 µg/L 6.3% of the EPA limit 1300 µg/L
worst single sample: 430 µg/L | 90/99 | SYR4 | 2013–2017 |
| Chloroform | 4.71 µg/L No EPA limit set
worst single sample: 11.9 µg/L | 50/130 | SYR4 | 2012–2019 |
| Nitrate | 330 µg/L 3.3% of the EPA limit 10000 µg/L | 38/40 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 2.62 µg/L No EPA limit set
worst single sample: 3.2 µg/L | 28/114 | SYR4 | 2012–2019 |
| Fluoride | 607.5 µg/L 15% of the EPA limit 4000 µg/L
worst single sample: 630 µg/L | 16/16 | SYR4 | 2012–2019 |
| Barium | 126.45 µg/L 6.3% of the EPA limit 2000 µg/L
worst single sample: 131 µg/L | 14/14 | SYR4 | 2013–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 13/13 | LCR | 2023 |
| Trichloroacetic Acid | 7.2 µg/L No EPA limit set | 12/114 | SYR4 | 2012–2019 |
| Cyanide | 164 µg/L 82% of the EPA limit 200 µg/L
worst single sample: 200 µg/L | 10/12 | SYR4 | 2014–2019 |
| Selenium | 5.885 µg/L 12% of the EPA limit 50 µg/L
worst single sample: 6.2 µg/L | 10/14 | SYR4 | 2013–2019 |
| Monochloroacetic Acid | 4.38 µg/L No EPA limit set
worst single sample: 4.5 µg/L | 9/114 | SYR4 | 2012–2019 |
| Lead | 4.688 µg/L 31% of the EPA limit 15 µg/L
worst single sample: 5.01 µg/L | 8/99 | SYR4 | 2013–2017 |
| Lithium | 49.8 µg/L No EPA limit set | 8/8 | UCMR-5 | 2025 |
| Combined Uranium | 2 µg/L 6.7% of the EPA limit 30 µg/L | 2/2 | SYR4 | 2017 |
| Gross Beta Particle Activity | 8.94 pCi/L No EPA limit set
worst single sample: 9 pCi/L | 2/2 | SYR4 | 2017 |
| Xylenes, Total | 1.19 µg/L 0% of the EPA limit 10000 µg/L
worst single sample: 1.2 µg/L | 2/16 | SYR4 | 2012–2019 |
| Arsenic | 2.3 µg/L 23% of the EPA limit 10 µg/L | 1/14 | SYR4 | 2013–2019 |
| Carbon Tetrachloride | 0.9000 µg/L 18% of the EPA limit 5 µg/L | 1/16 | SYR4 | 2012–2019 |
| Combined Radium (-226 And -228) | 1.5 pCi/L 30% of the EPA limit 5 pCi/L | 1/1 | SYR4 | 2017 |
| Di(2-ethylhexyl) Phthalate | 0.6100 µg/L 10% of the EPA limit 6 µg/L | 1/19 | SYR4 | 2012–2019 |
| Gross Alpha, Excl. Radon And U | 2 pCi/L 13% of the EPA limit 15 pCi/L | 1/2 | SYR4 | 2017 |
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-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPFBSPfdaPfdoaPfeesaPfhpsPfmbaPfmpaPFNAPFOAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about City of San Juan
Is City of San Juan tap water safe to drink?
EPA monitoring detected 35 contaminants in City of San Juan'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 City of San Juan's water?
EPA monitoring detected Chlorite, Bromoform, Dibromochloromethane, Bromodichloromethane, TTHM, and others. The full list with the level and data source for each is above.
How many people does City of San Juan serve?
City of San Juan reports serving 30,000 people in Texas, per its EPA record.
Has City of San Juan had any water quality violations?
The EPA has 31 violations on file for City of San Juan, 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.