What was found in Crest Hill'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 | 1784 µg/L 137% of the EPA limit, at the 95th percentile of samples — 1300 µg/L Main supplier: CREST HILL · 21,169 people · 2018 | 1/1 | SYR4 |
| Nitrate | 1310 µg/L 13% of the EPA limit 10000 µg/L Main supplier: CREST HILL · 21,169 people · 2019 | 1/1 | SYR4 |
| Nitrate-Nitrite | 1129 µg/L 11% of the EPA limit 10000 µg/L Main supplier: CREST HILL · 21,169 people · 2016 | 1/1 | SYR4 |
| Fluoride | 1097 µg/L 27% of the EPA limit 4000 µg/L Main supplier: CREST HILL · 21,169 people · 2019 | 1/1 | SYR4 |
| Barium | 142.75 µg/L 7.1% of the EPA limit 2000 µg/L Main supplier: CREST HILL · 21,169 people · 2019 | 1/1 | SYR4 |
| TTHM | 54.99 µg/L 69% of the EPA limit 80 µg/L Main supplier: CREST HILL · 21,169 people · 2019 | 1/1 | SYR4 |
| Chloroform | 42.325 µg/L No EPA limit set Main supplier: CREST HILL · 21,169 people · 2019 | 1/1 | SYR4 |
| Nitrite | 39 µg/L 3.9% of the EPA limit 1000 µg/L Main supplier: CREST HILL · 21,169 people · 2019 | 1/1 | SYR4 |
| Lithium | 34.8 µg/L No EPA limit set Main supplier: CREST HILL · 21,169 people · 2023 | 1/1 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 15.1575 µg/L 25% of the EPA limit 60 µg/L Main supplier: CREST HILL · 21,169 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 13.19 µg/L No EPA limit set Main supplier: CREST HILL · 21,169 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 8.8345 µg/L No EPA limit set Main supplier: CREST HILL · 21,169 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 8.2935 µg/L No EPA limit set Main supplier: CREST HILL · 21,169 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 7.4755 µg/L No EPA limit set Main supplier: CREST HILL · 21,169 people · 2019 | 1/1 | SYR4 |
| Chromium | 7.1905 µg/L 7.2% of the EPA limit 100 µg/L Main supplier: CREST HILL · 21,169 people · 2019 | 1/1 | SYR4 |
| Lead | 6.23 µg/L 42% of the EPA limit 15 µg/L Main supplier: CREST HILL · 21,169 people · 2018 | 1/1 | SYR4 |
| Cyanide | 5 µg/L 2.5% of the EPA limit 200 µg/L Main supplier: CREST HILL · 21,169 people · 2018 | 1/1 | SYR4 |
| Gross Beta Particle Activity | 5 pCi/L No EPA limit set Main supplier: CREST HILL · 21,169 people · 2014 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 3.718 pCi/L 74% of the EPA limit 5 pCi/L Main supplier: CREST HILL · 21,169 people · 2018 | 1/1 | SYR4 |
| Dibromoacetic Acid | 2.51 µg/L No EPA limit set Main supplier: CREST HILL · 21,169 people · 2019 | 1/1 | SYR4 |
| Bromoform | 2.4444 µg/L No EPA limit set Main supplier: CREST HILL · 21,169 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 2.4075 µg/L No EPA limit set Main supplier: CREST HILL · 21,169 people · 2019 | 1/1 | SYR4 |
| Selenium | 2.33 µg/L 4.7% of the EPA limit 50 µg/L Main supplier: CREST HILL · 21,169 people · 2019 | 1/1 | SYR4 |
| Arsenic | 1.4165 µg/L 14% of the EPA limit 10 µg/L Main supplier: CREST HILL · 21,169 people · 2019 | 1/1 | SYR4 |
| PFBS | 0.0521 µg/L No EPA limit set Main supplier: CREST HILL · 21,169 people · 2023 | 1/1 | UCMR-5 |
| Pfpea | 0.0322 µg/L No EPA limit set Main supplier: CREST HILL · 21,169 people · 2023 | 1/1 | UCMR-5 |
| Pfba | 0.0272 µg/L No EPA limit set Main supplier: CREST HILL · 21,169 people · 2023 | 1/1 | UCMR-5 |
| Pfhxa | 0.0244 µg/L No EPA limit set Main supplier: CREST HILL · 21,169 people · 2023 | 1/1 | UCMR-5 |
| PFOA | 0.0137 µg/L No EPA limit set Main supplier: CREST HILL · 21,169 people · 2023 | 1/1 | UCMR-5 |
| Pfhpa | 0.0133 µg/L No EPA limit set Main supplier: CREST HILL · 21,169 people · 2023 | 1/1 | UCMR-5 |
| PFHXS | 0.0122 µg/L No EPA limit set Main supplier: CREST HILL · 21,169 people · 2023 | 1/1 | UCMR-5 |
| Lead | 0.0021 mg/L 14% of the EPA limit 0.0150 mg/L Main supplier: CREST HILL · 21,169 people · 2025 | 1/1 | LCR |
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 Crest Hill
| Supplier | Population served |
|---|---|
| CREST HILL | 21,169 |
Frequently asked questions about Crest Hill tap water
Is Crest Hill tap water safe to drink?
EPA testing detected 32 contaminants in the water serving Crest Hill. 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 Crest Hill?
1 public water supplier report drinking-water monitoring for Crest Hill, Illinois to the EPA. Each is listed above with its population served.
What contaminants are in Crest Hill's water?
The contaminants EPA monitoring detected in Crest Hill include Copper, Nitrate, Nitrate-Nitrite, Fluoride, Barium. 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.