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.
132
health-based violations
266
violations on file
3
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Resolved | 2015-06-01 → 2015-06-30 |
| MCL | Health-based | Resolved | 2015-06-01 → 2015-06-30 |
| MCL | Health-based | Resolved | 2015-06-01 → 2015-06-30 |
| MCL | Health-based | Resolved | 2015-06-01 → 2015-06-30 |
| MCL | Health-based | Resolved | 2001-10-01 → 2002-09-30 |
| MCL | Health-based | Archived | 1999-07-01 → 1999-07-31 |
| MCL | Health-based | Archived | 1999-07-01 → 1999-07-31 |
| MCL | Health-based | Resolved | 1999-04-01 → 2002-10-31 |
| MCL | Health-based | Resolved | 1999-04-01 → 2002-10-31 |
| MCL | Health-based | Resolved | 1999-04-01 → 2002-10-31 |
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 |
|---|---|---|---|---|
| Copper | 795.8 µg/L 61% of the EPA limit 1300 µg/L
worst single sample: 1150 µg/L | 49/61 | SYR4 | 2014–2017 |
| Nitrate | 1740 µg/L 17% of the EPA limit 10000 µg/L
worst single sample: 2170 µg/L | 48/100 | SYR4 | 2012–2019 |
| Lead | 0.0300 mg/L 200% above the EPA limit of 0.0150 mg/L | 29/29 | LCR | 2025 |
| Bromodichloromethane | 10.365 µg/L No EPA limit set
worst single sample: 12.2 µg/L | 28/28 | SYR4 | 2012–2019 |
| Chloroform | 13.675 µg/L No EPA limit set
worst single sample: 15.6 µg/L | 28/28 | SYR4 | 2012–2019 |
| Lead | 23.775 µg/L 159% of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 30.5 µg/L | 28/61 | SYR4 | 2014–2017 |
| TTHM | 31.98 µg/L 40% of the EPA limit 80 µg/L
worst single sample: 37.3 µg/L | 28/28 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 10.746 µg/L 18% of the EPA limit 60 µg/L
worst single sample: 11.08 µg/L | 28/28 | SYR4 | 2012–2019 |
| Dibromochloromethane | 6.844 µg/L No EPA limit set
worst single sample: 8.04 µg/L | 27/28 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 5.378 µg/L No EPA limit set
worst single sample: 5.55 µg/L | 27/28 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 4.089 µg/L No EPA limit set
worst single sample: 4.21 µg/L | 27/28 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 2.053 µg/L No EPA limit set
worst single sample: 2.3 µg/L | 20/28 | SYR4 | 2012–2019 |
| Barium | 49.89 µg/L 2.5% of the EPA limit 2000 µg/L
worst single sample: 52.5 µg/L | 19/19 | SYR4 | 2012–2019 |
| Fluoride | 1011 µg/L 25% of the EPA limit 4000 µg/L
worst single sample: 1110 µg/L | 19/19 | SYR4 | 2012–2019 |
| Lithium | 65 µg/L No EPA limit set | 14/14 | UCMR-5 | 2024 |
| Arsenic | 7.827 µg/L 78% of the EPA limit 10 µg/L
worst single sample: 10.5 µg/L | 12/20 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 1072.45 µg/L 11% of the EPA limit 10000 µg/L
worst single sample: 1260 µg/L | 12/21 | SYR4 | 2012–2016 |
| Combined Radium (-226 And -228) | 2.885 pCi/L 58% of the EPA limit 5 pCi/L
worst single sample: 3.2 pCi/L | 10/16 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 1.81 µg/L No EPA limit set
worst single sample: 1.9 µg/L | 7/28 | SYR4 | 2012–2019 |
| Bromoform | 1.4675 µg/L No EPA limit set
worst single sample: 1.47 µg/L | 6/28 | SYR4 | 2012–2019 |
| Chromium | 20.921 µg/L 21% of the EPA limit 100 µg/L
worst single sample: 22.4 µg/L | 3/19 | SYR4 | 2012–2019 |
| Selenium | 2.508 µg/L 5% of the EPA limit 50 µg/L
worst single sample: 2.52 µg/L | 2/19 | SYR4 | 2012–2019 |
| Xylenes, Total | 0.9000 µg/L 0% of the EPA limit 10000 µg/L
worst single sample: 0.9100 µg/L | 2/28 | SYR4 | 2012–2019 |
| Toluene | 0.6600 µg/L 0.1% of the EPA limit 1000 µg/L | 1/28 | SYR4 | 2012–2019 |
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-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPfdaPfdoaPfeesaPfhpaPfhpsPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Lockport
Is Lockport tap water safe to drink?
EPA monitoring detected 28 contaminants in Lockport'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 Lockport's water?
EPA monitoring detected Copper, Nitrate, Lead, Bromodichloromethane, Chloroform, and others. The full list with the level and data source for each is above.
How many people does Lockport serve?
Lockport reports serving 23,100 people in Illinois, per its EPA record.
Has Lockport had any water quality violations?
The EPA has 266 violations on file for Lockport, of which 132 are health-based (a contaminant limit or required treatment was breached) and 3 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.