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.
22
health-based violations
62
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Archived | 1996-07-01 → 1996-07-31 |
| MCL | Health-based | Archived | 1996-07-01 → 1996-07-31 |
| MCL | Health-based | Archived | 1996-07-01 → 1996-07-31 |
| MCL | Health-based | Resolved | 1986-06-01 → 1989-05-31 |
| MCL | Health-based | Resolved | 1986-06-01 → 1989-05-31 |
| MCL | Health-based | Resolved | 1986-06-01 → 1989-05-31 |
| MCL | Health-based | Resolved | 1986-06-01 → 1989-05-31 |
| MCL | Health-based | Resolved | 1986-06-01 → 1989-05-31 |
| MCL | Health-based | Resolved | 1986-06-01 → 1989-05-31 |
| MCL | Health-based | Resolved | 1986-06-01 → 1989-05-31 |
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 |
|---|---|---|---|---|
| cis-1,2-Dichloroethylene | 44.8 µg/L 64% of the EPA limit 70 µg/L
worst single sample: 48.6 µg/L | 103/139 | SYR4 | 2012–2019 |
| Trichloroethylene | 4.7275 µg/L 95% of the EPA limit 5 µg/L
worst single sample: 9.19 µg/L | 96/138 | SYR4 | 2012–2019 |
| Bromodichloromethane | 18.555 µg/L No EPA limit set
worst single sample: 22.4 µg/L | 88/88 | SYR4 | 2012–2019 |
| Chloroform | 23.33 µg/L No EPA limit set
worst single sample: 28.1 µg/L | 88/88 | SYR4 | 2012–2019 |
| TTHM | 63.5 µg/L 79% of the EPA limit 80 µg/L
worst single sample: 75.8 µg/L | 88/88 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 16.665 µg/L 28% of the EPA limit 60 µg/L
worst single sample: 31.2 µg/L | 88/88 | SYR4 | 2012–2019 |
| Dibromochloromethane | 21.87 µg/L No EPA limit set
worst single sample: 28.5 µg/L | 87/88 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 7.4155 µg/L No EPA limit set
worst single sample: 19.1 µg/L | 80/88 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 7.44 µg/L No EPA limit set
worst single sample: 9.55 µg/L | 71/88 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 5.9 µg/L No EPA limit set
worst single sample: 11.3 µg/L | 53/88 | SYR4 | 2012–2019 |
| Copper | 1256 µg/L 97% of the EPA limit 1300 µg/L
worst single sample: 1730 µg/L | 52/60 | SYR4 | 2014–2017 |
| Bromoform | 17.5 µg/L No EPA limit set
worst single sample: 17.9 µg/L | 41/88 | SYR4 | 2012–2019 |
| Lead | 0.0077 mg/L 51% of the EPA limit 0.0150 mg/L | 24/24 | LCR | 2025 |
| Combined Radium (-226 And -228) | 4.22 pCi/L 84% of the EPA limit 5 pCi/L
worst single sample: 5.51 pCi/L | 21/28 | SYR4 | 2014–2019 |
| Barium | 1120.6 µg/L 56% of the EPA limit 2000 µg/L
worst single sample: 1710 µg/L | 15/15 | SYR4 | 2012–2018 |
| Fluoride | 1052 µg/L 26% of the EPA limit 4000 µg/L
worst single sample: 1080 µg/L | 15/15 | SYR4 | 2012–2018 |
| Monobromoacetic Acid | 1.546 µg/L No EPA limit set
worst single sample: 1.56 µg/L | 15/88 | SYR4 | 2012–2019 |
| Xylenes, Total | 9.195 µg/L 0.1% of the EPA limit 10000 µg/L
worst single sample: 12.1 µg/L | 15/133 | SYR4 | 2012–2019 |
| trans-1,2-Dichloroethylene | 1.653 µg/L 1.7% of the EPA limit 100 µg/L
worst single sample: 1.66 µg/L | 15/115 | SYR4 | 2012–2019 |
| Lead | 40.4 µg/L 269% of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 41 µg/L | 11/60 | SYR4 | 2014–2017 |
| Monochloroacetic Acid | 3.594 µg/L No EPA limit set
worst single sample: 3.87 µg/L | 9/88 | SYR4 | 2012–2019 |
| Ethylbenzene | 1.342 µg/L 0.2% of the EPA limit 700 µg/L
worst single sample: 1.37 µg/L | 3/113 | SYR4 | 2012–2019 |
| 1,2-Dichloroethane | 35.685 µg/L 714% of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 37 µg/L | 2/114 | SYR4 | 2012–2019 |
| Cyanide | 5.48 µg/L 2.7% of the EPA limit 200 µg/L | 2/15 | SYR4 | 2012–2018 |
| Di(2-ethylhexyl) Phthalate | 2.55 µg/L 43% of the EPA limit 6 µg/L
worst single sample: 2.62 µg/L | 2/40 | SYR4 | 2012–2019 |
| Toluene | 1.79 µg/L 0.2% of the EPA limit 1000 µg/L | 1/114 | SYR4 | 2012–2019 |
80 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitrateNitrate-NitriteNitriteOxamylPfbaPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl ChlorideLithiumO-DichlorobenzeneP-Dichlorobenzene
Utility contact
Frequently asked questions about Crystal Lake
Is Crystal Lake tap water safe to drink?
EPA monitoring detected 28 contaminants in Crystal Lake'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 Crystal Lake's water?
EPA monitoring detected cis-1,2-Dichloroethylene, Trichloroethylene, Bromodichloromethane, Chloroform, TTHM, and others. The full list with the level and data source for each is above.
How many people does Crystal Lake serve?
Crystal Lake reports serving 40,661 people in Illinois, per its EPA record.
Has Crystal Lake had any water quality violations?
The EPA has 62 violations on file for Crystal Lake, of which 22 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.