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.
19
health-based violations
666
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Resolved | 2009-05-01 → 2009-05-31 |
| MCL | Health-based | Resolved | 2009-05-01 → 2009-05-31 |
| MCL | Health-based | Resolved | 2009-05-01 → 2009-05-31 |
| MCL | Health-based | Resolved | 2009-05-01 → 2009-05-31 |
| MCL | Health-based | Resolved | 2009-05-01 → 2009-05-31 |
| MCL | Health-based | Resolved | 2008-11-01 → 2008-11-30 |
| MCL | Health-based | Resolved | 2008-11-01 → 2008-11-30 |
| MCL | Health-based | Resolved | 2008-11-01 → 2008-11-30 |
| MCL | Health-based | Resolved | 2008-11-01 → 2008-11-30 |
| MCL | Health-based | Resolved | 2008-11-01 → 2008-11-30 |
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 |
|---|---|---|---|---|
| Vinyl Chloride | 7.678 µg/L 384% of the EPA limit, at the 95th percentile of samples — 2 µg/L
worst single sample: 9.97 µg/L | 89/195 | SYR4 | 2012–2019 |
| cis-1,2-Dichloroethylene | 3.595 µg/L 5.1% of the EPA limit 70 µg/L
worst single sample: 4.6 µg/L | 46/194 | SYR4 | 2012–2019 |
| Copper | 865.45 µg/L 67% of the EPA limit 1300 µg/L
worst single sample: 1160 µg/L | 38/60 | SYR4 | 2014–2017 |
| Total Haloacetic Acids (HAA5) | 4.507 µg/L 7.5% of the EPA limit 60 µg/L
worst single sample: 5.68 µg/L | 23/30 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 1.421 µg/L No EPA limit set
worst single sample: 1.43 µg/L | 19/30 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 15/15 | LCR | 2023 |
| Dichloromethane | 1.0425 µg/L 21% of the EPA limit 5 µg/L
worst single sample: 1.09 µg/L | 6/194 | SYR4 | 2012–2019 |
| Nitrite | 21.525 µg/L 2.2% of the EPA limit 1000 µg/L
worst single sample: 23 µg/L | 6/14 | SYR4 | 2014–2018 |
| Trichloroacetic Acid | 1.2 µg/L No EPA limit set
worst single sample: 1.21 µg/L | 5/30 | SYR4 | 2012–2019 |
| Xylenes, Total | 26.422 µg/L 0.3% of the EPA limit 10000 µg/L
worst single sample: 32.1 µg/L | 5/194 | SYR4 | 2012–2019 |
| Barium | 61.775 µg/L 3.1% of the EPA limit 2000 µg/L
worst single sample: 62 µg/L | 4/4 | SYR4 | 2014–2018 |
| Combined Radium (-226 And -228) | 3.757 pCi/L 75% of the EPA limit 5 pCi/L
worst single sample: 3.82 pCi/L | 4/4 | SYR4 | 2014–2018 |
| Fluoride | 1089.5 µg/L 27% of the EPA limit 4000 µg/L
worst single sample: 1130 µg/L | 4/4 | SYR4 | 2014–2018 |
| Lead | 41.1725 µg/L 274% of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 47 µg/L | 4/60 | SYR4 | 2014–2017 |
| Nitrate | 122 µg/L 1.2% of the EPA limit 10000 µg/L | 4/26 | SYR4 | 2012–2019 |
| Arsenic | 1.40175 µg/L 14% of the EPA limit 10 µg/L
worst single sample: 1.44 µg/L | 2/4 | SYR4 | 2014–2018 |
| Bromodichloromethane | 1.239 µg/L No EPA limit set
worst single sample: 1.24 µg/L | 2/32 | SYR4 | 2012–2019 |
| Bromoform | 1.5905 µg/L No EPA limit set
worst single sample: 1.62 µg/L | 2/30 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 0.9752 µg/L No EPA limit set
worst single sample: 1.01 µg/L | 2/30 | SYR4 | 2012–2019 |
| Dibromochloromethane | 1.5595 µg/L No EPA limit set
worst single sample: 1.57 µg/L | 2/30 | SYR4 | 2012–2019 |
| Ethylbenzene | 12.293 µg/L 1.8% of the EPA limit 700 µg/L
worst single sample: 12.9 µg/L | 2/194 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 1.1805 µg/L No EPA limit set
worst single sample: 1.19 µg/L | 2/30 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 2.2505 µg/L No EPA limit set
worst single sample: 2.26 µg/L | 2/30 | SYR4 | 2012–2019 |
| TTHM | 4.371 µg/L 5.5% of the EPA limit 80 µg/L
worst single sample: 4.41 µg/L | 2/30 | SYR4 | 2012–2019 |
| Toluene | 6.738 µg/L 0.7% of the EPA limit 1000 µg/L
worst single sample: 7.05 µg/L | 2/194 | SYR4 | 2012–2019 |
| Lithium | 70.3 µg/L No EPA limit set | 2/2 | UCMR-5 | 2025 |
| Nitrate-Nitrite | 69.5 µg/L 0.7% of the EPA limit 10000 µg/L | 1/5 | SYR4 | 2014–2016 |
| Selenium | 2.18 µg/L 4.4% of the EPA limit 50 µg/L | 1/4 | SYR4 | 2014–2018 |
80 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 TetrachlorideChlordaneChloroformChromiumDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Sauk
Is Sauk tap water safe to drink?
EPA monitoring detected 28 contaminants in Sauk'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 Sauk's water?
EPA monitoring detected Vinyl Chloride, cis-1,2-Dichloroethylene, Copper, 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 Sauk serve?
Sauk reports serving 9,921 people in Illinois, per its EPA record.
Has Sauk had any water quality violations?
The EPA has 666 violations on file for Sauk, of which 19 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.