What was found in Crystal Lake's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Copper | 1256 µg/L 97% of the EPA limit 1300 µg/L Main supplier: CRYSTAL LAKE · 40,661 people · 2017 | 1/1 | SYR4 |
| Barium | 1120.6 µg/L 56% of the EPA limit 2000 µg/L Main supplier: CRYSTAL LAKE · 40,661 people · 2018 | 1/1 | SYR4 |
| Fluoride | 1052 µg/L 26% of the EPA limit 4000 µg/L Main supplier: CRYSTAL LAKE · 40,661 people · 2018 | 1/1 | SYR4 |
| TTHM | 63.5 µg/L 79% of the EPA limit 80 µg/L Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| cis-1,2-Dichloroethylene | 44.8 µg/L 64% of the EPA limit 70 µg/L Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| Lead | 40.4 µg/L 269% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: CRYSTAL LAKE · 40,661 people · 2017 | 1/1 | SYR4 |
| 1,2-Dichloroethane | 35.685 µg/L 714% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| Chloroform | 23.33 µg/L No EPA limit set Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 21.87 µg/L No EPA limit set Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 18.555 µg/L No EPA limit set Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| Bromoform | 17.5 µg/L No EPA limit set Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 16.665 µg/L 28% of the EPA limit 60 µg/L Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| Xylenes, Total | 9.195 µg/L 0.1% of the EPA limit 10000 µg/L Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 7.44 µg/L No EPA limit set Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 7.4155 µg/L No EPA limit set Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 5.9 µg/L No EPA limit set Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| Cyanide | 5.48 µg/L 2.7% of the EPA limit 200 µg/L Main supplier: CRYSTAL LAKE · 40,661 people · 2018 | 1/1 | SYR4 |
| Trichloroethylene | 4.7275 µg/L 95% of the EPA limit 5 µg/L Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 4.22 pCi/L 84% of the EPA limit 5 pCi/L Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 3.594 µg/L No EPA limit set Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 2.55 µg/L 43% of the EPA limit 6 µg/L Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| Toluene | 1.79 µg/L 0.2% of the EPA limit 1000 µg/L Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| trans-1,2-Dichloroethylene | 1.653 µg/L 1.7% of the EPA limit 100 µg/L Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 1.546 µg/L No EPA limit set Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| Ethylbenzene | 1.342 µg/L 0.2% of the EPA limit 700 µg/L Main supplier: CRYSTAL LAKE · 40,661 people · 2019 | 1/1 | SYR4 |
| Lead | 0.0077 mg/L 51% of the EPA limit 0.0150 mg/L Main supplier: CRYSTAL LAKE · 40,661 people · 2025 | 1/1 | LCR |
| PFBS | 0.0046 µg/L No EPA limit set Main supplier: CRYSTAL LAKE · 40,661 people · 2025 | 1/1 | UCMR-5 |
| Pfpea | 0.0045 µg/L No EPA limit set Main supplier: CRYSTAL LAKE · 40,661 people · 2025 | 1/1 | UCMR-5 |
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 the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Crystal Lake
| Supplier | Population served |
|---|---|
| CRYSTAL LAKE | 40,661 |
Frequently asked questions about Crystal Lake tap water
Is Crystal Lake tap water safe to drink?
EPA testing detected 28 contaminants in the water serving Crystal Lake. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Crystal Lake?
1 public water supplier report drinking-water monitoring for Crystal Lake, Illinois to the EPA. Each is listed above with its population served.
What contaminants are in Crystal Lake's water?
The contaminants EPA monitoring detected in Crystal Lake include Copper, Barium, Fluoride, TTHM, cis-1,2-Dichloroethylene. The full list, with the level at the main supplier and the data source, is in the table above.
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.