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.
0
health-based violations
185
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| Other | Monitoring | Resolved | 2025-07-01 |
| Other | Monitoring | Resolved | 2025-07-01 |
| MR | Monitoring | Resolved | 2021-01-01 → 2021-12-31 |
| MR | Monitoring | Resolved | 2021-01-01 → 2021-12-31 |
| MR | Monitoring | Resolved | 2021-01-01 → 2021-12-31 |
| MR | Monitoring | Resolved | 2021-01-01 → 2021-12-31 |
| MR | Monitoring | Resolved | 2020-01-01 → 2022-12-31 |
| MR | Monitoring | Resolved | 2020-01-01 → 2022-12-31 |
| MR | Monitoring | Resolved | 2020-01-01 → 2022-12-31 |
| MR | Monitoring | Resolved | 2020-01-01 → 2022-12-31 |
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 |
|---|---|---|---|---|
| Copper | 519.95 µg/L 40% of the EPA limit 1300 µg/L
worst single sample: 961 µg/L | 48/60 | SYR4 | 2014–2017 |
| Chloroform | 2.888 µg/L No EPA limit set
worst single sample: 3.37 µg/L | 32/32 | SYR4 | 2012–2019 |
| TTHM | 6.1135 µg/L 7.6% of the EPA limit 80 µg/L
worst single sample: 7 µg/L | 32/32 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 5.488 µg/L 9.1% of the EPA limit 60 µg/L
worst single sample: 9.43 µg/L | 32/32 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 2.45 µg/L No EPA limit set
worst single sample: 3.12 µg/L | 31/32 | SYR4 | 2012–2019 |
| Bromodichloromethane | 1.838 µg/L No EPA limit set
worst single sample: 2.48 µg/L | 25/32 | SYR4 | 2012–2019 |
| Lead | 0.0016 mg/L 11% of the EPA limit 0.0150 mg/L | 24/24 | LCR | 2027 |
| Monobromoacetic Acid | 1.48 µg/L No EPA limit set
worst single sample: 1.49 µg/L | 21/32 | SYR4 | 2012–2019 |
| Barium | 131.25 µg/L 6.6% of the EPA limit 2000 µg/L
worst single sample: 147 µg/L | 16/16 | SYR4 | 2012–2018 |
| Fluoride | 1175 µg/L 29% of the EPA limit 4000 µg/L
worst single sample: 1220 µg/L | 16/16 | SYR4 | 2012–2018 |
| Lead | 7.45 µg/L 50% of the EPA limit 15 µg/L
worst single sample: 8.62 µg/L | 11/60 | SYR4 | 2014–2017 |
| Lithium | 39.9 µg/L No EPA limit set | 8/8 | UCMR-5 | 2025 |
| Dibromochloromethane | 1.437 µg/L No EPA limit set
worst single sample: 1.44 µg/L | 7/32 | SYR4 | 2012–2019 |
| Arsenic | 3.761 µg/L 38% of the EPA limit 10 µg/L
worst single sample: 4.71 µg/L | 6/16 | SYR4 | 2012–2018 |
| Combined Radium (-226 And -228) | 3.9525 pCi/L 79% of the EPA limit 5 pCi/L
worst single sample: 4.2 pCi/L | 6/6 | SYR4 | 2014–2017 |
| Dibromoacetic Acid | 1.91 µg/L No EPA limit set
worst single sample: 2.12 µg/L | 5/32 | SYR4 | 2012–2019 |
| Bromoform | 1.2845 µg/L No EPA limit set
worst single sample: 1.31 µg/L | 4/32 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 1.164 µg/L No EPA limit set
worst single sample: 1.17 µg/L | 4/32 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 6.4255 µg/L No EPA limit set
worst single sample: 6.58 µg/L | 2/32 | SYR4 | 2012–2019 |
| Selenium | 5.31 µg/L 11% of the EPA limit 50 µg/L
worst single sample: 5.47 µg/L | 2/16 | SYR4 | 2012–2018 |
| Antimony, Total | 4.25 µg/L 71% of the EPA limit 6 µg/L | 1/16 | SYR4 | 2012–2018 |
| Benzo(A)Pyrene | 0.1040 µg/L 52% of the EPA limit 0.2000 µg/L | 1/44 | SYR4 | 2012–2019 |
| Beryllium, Total | 4.11 µg/L 103% of the EPA limit, at the 95th percentile of samples — 4 µg/L | 1/16 | SYR4 | 2012–2018 |
| Cadmium | 4.92 µg/L 98% of the EPA limit 5 µg/L | 1/16 | SYR4 | 2012–2018 |
| Nitrate-Nitrite | 22 µg/L 0.2% of the EPA limit 10000 µg/L | 1/20 | SYR4 | 2012–2016 |
| Nitrite | 22 µg/L 2.2% of the EPA limit 1000 µg/L | 1/45 | SYR4 | 2012–2018 |
| Thallium, Total | 4.64 µg/L 232% of the EPA limit, at the 95th percentile of samples — 2 µg/L | 1/16 | SYR4 | 2012–2018 |
81 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-PF3ONSAdonaAtrazineBhc-GammaBenzeneChlorobenzeneCyanideCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitrateOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Warrenville
Is Warrenville tap water safe to drink?
EPA monitoring detected 27 contaminants in Warrenville'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 Warrenville's water?
EPA monitoring detected Copper, Chloroform, TTHM, Total Haloacetic Acids (HAA5), Dichloroacetic Acid, and others. The full list with the level and data source for each is above.
How many people does Warrenville serve?
Warrenville reports serving 12,350 people in Illinois, per its EPA record.
Has Warrenville had any water quality violations?
The EPA has 185 violations on file for Warrenville, of which 0 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.