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.
53
health-based violations
60
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Archived | 2026-01-01 → 2026-03-31 |
| MCL | Health-based | Archived | 2026-01-01 → 2026-03-31 |
| MCL | Health-based | Archived | 2026-01-01 → 2026-03-31 |
| MCL | Health-based | Archived | 2026-01-01 → 2026-03-31 |
| MCL | Health-based | Archived | 2025-10-01 → 2025-12-31 |
| MCL | Health-based | Archived | 2025-10-01 → 2025-12-31 |
| MCL | Health-based | Archived | 2025-10-01 → 2025-12-31 |
| MCL | Health-based | Archived | 2025-10-01 → 2025-12-31 |
| MCL | Health-based | Archived | 2025-07-01 → 2025-09-30 |
| MCL | Health-based | Archived | 2025-07-01 → 2025-09-30 |
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 |
|---|---|---|---|---|
| Bromodichloromethane | 18 µg/L No EPA limit set
worst single sample: 22 µg/L | 64/64 | SYR4 | 2012–2019 |
| Chloroform | 53.255 µg/L No EPA limit set
worst single sample: 91 µg/L | 64/64 | SYR4 | 2012–2019 |
| Dibromochloromethane | 5.395 µg/L No EPA limit set
worst single sample: 7.9 µg/L | 64/64 | SYR4 | 2012–2019 |
| TTHM | 72.7 µg/L 91% of the EPA limit 80 µg/L
worst single sample: 117.3 µg/L | 61/61 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 44.305 µg/L 74% of the EPA limit 60 µg/L
worst single sample: 48.2 µg/L | 60/61 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 23.33 µg/L No EPA limit set
worst single sample: 26 µg/L | 59/61 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 20 µg/L No EPA limit set
worst single sample: 21.8 µg/L | 58/61 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 1.84 µg/L No EPA limit set
worst single sample: 2.2 µg/L | 39/61 | SYR4 | 2012–2019 |
| Copper | 2840 µg/L 218% of the EPA limit, at the 95th percentile of samples — 1300 µg/L
worst single sample: 3500 µg/L | 24/47 | SYR4 | 2014–2019 |
| Monochloroacetic Acid | 2.795 µg/L No EPA limit set
worst single sample: 2.9 µg/L | 22/61 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 1000 µg/L 10% of the EPA limit 10000 µg/L | 18/20 | SYR4 | 2012–2019 |
| Lead | 13.7 µg/L 91% of the EPA limit 15 µg/L
worst single sample: 15 µg/L | 14/47 | SYR4 | 2014–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 12/12 | LCR | 2023 |
| Fluoride | 160 µg/L 4% of the EPA limit 4000 µg/L | 10/10 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 1.36 µg/L No EPA limit set
worst single sample: 1.5 µg/L | 8/61 | SYR4 | 2012–2019 |
| Barium | 78.4 µg/L 3.9% of the EPA limit 2000 µg/L
worst single sample: 82 µg/L | 7/10 | SYR4 | 2012–2019 |
| Atrazine | 0.5025 µg/L 17% of the EPA limit 3 µg/L
worst single sample: 0.5700 µg/L | 6/18 | SYR4 | 2012–2019 |
| Gross Beta Particle Activity | 4.205 pCi/L No EPA limit set
worst single sample: 4.27 pCi/L | 6/10 | SYR4 | 2012–2019 |
| Dalapon | 38.0848 µg/L 19% of the EPA limit 200 µg/L
worst single sample: 38.27 µg/L | 5/15 | SYR4 | 2012–2019 |
| Di(2-ethylhexyl) Phthalate | 1.139 µg/L 19% of the EPA limit 6 µg/L
worst single sample: 1.22 µg/L | 4/17 | SYR4 | 2012–2019 |
| Arsenic | 1.36 µg/L 14% of the EPA limit 10 µg/L
worst single sample: 1.4 µg/L | 3/10 | SYR4 | 2012–2019 |
| Combined Radium (-226 And -228) | 0.5235 pCi/L 10% of the EPA limit 5 pCi/L
worst single sample: 0.5390 pCi/L | 3/7 | SYR4 | 2015–2019 |
| Combined Uranium | 1.262 µg/L 4.2% of the EPA limit 30 µg/L
worst single sample: 1.3 µg/L | 2/7 | SYR4 | 2012–2019 |
| Bromoform | 0.5800 µg/L No EPA limit set | 1/64 | SYR4 | 2012–2019 |
| Carbon Tetrachloride | 0.8100 µg/L 16% of the EPA limit 5 µg/L | 1/10 | SYR4 | 2012–2019 |
| Selenium | 0.5100 µg/L 1% of the EPA limit 50 µg/L | 1/10 | SYR4 | 2012–2019 |
| Xylenes, Total | 0.6600 µg/L 0% of the EPA limit 10000 µg/L | 1/10 | SYR4 | 2012–2019 |
83 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranChlordaneChromiumDichloromethaneDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about City of Patterson Water
Is City of Patterson Water tap water safe to drink?
EPA monitoring detected 29 contaminants in City of Patterson 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 City of Patterson Water's water?
EPA monitoring detected Bromodichloromethane, Chloroform, Dibromochloromethane, TTHM, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.
How many people does City of Patterson Water serve?
City of Patterson Water reports serving 8,456 people in Louisiana, per its EPA record.
Has City of Patterson Water had any water quality violations?
The EPA has 60 violations on file for City of Patterson Water, of which 53 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.