What was found in Clark'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 |
|---|---|---|---|
| Nitrate | 344.5 µg/L 3.4% of the EPA limit 10000 µg/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2019
Highest in the city: 4300 µg/L — MILNER PARK · 100 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 194 µg/L 1.9% of the EPA limit 10000 µg/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2018
Highest in the city: 4230 µg/L — MILNER PARK · 100 people · 2018 | 2/2 | SYR4 |
| Fluoride | 1440 µg/L 36% of the EPA limit 4000 µg/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2017 | 2/2 | SYR4 |
| Barium | 184 µg/L 9.2% of the EPA limit 2000 µg/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2017
Highest in the city: 199 µg/L — MILNER PARK · 100 people · 2017 | 2/2 | SYR4 |
| TTHM | 16.725 µg/L 21% of the EPA limit 80 µg/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2019 | 2/2 | SYR4 |
| Nitrite | 16 µg/L 1.6% of the EPA limit 1000 µg/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2018 | 1/2 | SYR4 |
| Chloroform | 12.045 µg/L No EPA limit set Main supplier: STEAMBOAT LAKE WD · 411 people · 2019 | 1/2 | SYR4 |
| Arsenic | 9.26 µg/L 93% of the EPA limit 10 µg/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2017 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 8.87 µg/L 15% of the EPA limit 60 µg/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2017 | 2/2 | SYR4 |
| Bromodichloromethane | 6.96 µg/L No EPA limit set Main supplier: STEAMBOAT LAKE WD · 411 people · 2019 | 2/2 | SYR4 |
| Combined Radium (-226 And -228) | 4.26 pCi/L 85% of the EPA limit 5 pCi/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2018 | 2/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.955 pCi/L 26% of the EPA limit 15 pCi/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2018 | 2/2 | SYR4 |
| Selenium | 3.59 µg/L 7.2% of the EPA limit 50 µg/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2017 | 2/2 | SYR4 |
| Dibromochloromethane | 2.455 µg/L No EPA limit set Main supplier: STEAMBOAT LAKE WD · 411 people · 2019
Highest in the city: 2.955 µg/L — MILNER PARK · 100 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 2.6 µg/L No EPA limit set Main supplier: STEAMBOAT LAKE WD · 411 people · 2017 | 1/2 | SYR4 |
| Combined Uranium | 1.19 µg/L 4% of the EPA limit 30 µg/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2018
Highest in the city: 2.53 µg/L — MILNER PARK · 100 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 2.5 µg/L No EPA limit set Main supplier: STEAMBOAT LAKE WD · 411 people · 2017 | 2/2 | SYR4 |
| Monochloroacetic Acid | 1.6 µg/L No EPA limit set Main supplier: STEAMBOAT LAKE WD · 411 people · 2017
Highest in the city: 2.5 µg/L — MILNER PARK · 100 people · 2017 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 2.49 pCi/L No EPA limit set Main supplier: STEAMBOAT LAKE WD · 411 people · 2013 | 1/2 | SYR4 |
| Bromoform | 0.5475 µg/L No EPA limit set Main supplier: STEAMBOAT LAKE WD · 411 people · 2019
Highest in the city: 2.14 µg/L — MILNER PARK · 100 people · 2019 | 2/2 | SYR4 |
| Xylenes, Total | 1.852 µg/L 0% of the EPA limit 10000 µg/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2019 | 1/2 | SYR4 |
| Toluene | 1.6 µg/L 0.2% of the EPA limit 1000 µg/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2019 | 1/2 | SYR4 |
| Monobromoacetic Acid | 1.1 µg/L No EPA limit set Main supplier: STEAMBOAT LAKE WD · 411 people · 2017 | 1/2 | SYR4 |
| Trichloroacetic Acid | 1.1 µg/L No EPA limit set Main supplier: STEAMBOAT LAKE WD · 411 people · 2017 | 1/2 | SYR4 |
| Antimony, Total | 0.8800 µg/L 15% of the EPA limit 6 µg/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2017 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.7400 µg/L 12% of the EPA limit 6 µg/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2017 | 1/2 | SYR4 |
| Ethylbenzene | 0.5500 µg/L 0.1% of the EPA limit 700 µg/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2019 | 1/2 | SYR4 |
| Mercury | 0.1600 µg/L 8% of the EPA limit 2 µg/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2017 | 1/2 | SYR4 |
| Lead | 0.0024 mg/L 16% of the EPA limit 0.0150 mg/L Main supplier: STEAMBOAT LAKE WD · 411 people · 2025
Highest in the city: 0.0066 mg/L — MILNER PARK · 100 people · 2025 | 2/2 | 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 Clark
| Supplier | Population served |
|---|---|
| STEAMBOAT LAKE WD | 411 |
| MILNER PARK | 100 |
Frequently asked questions about Clark tap water
Is Clark tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Clark. 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 Clark?
2 public water suppliers report drinking-water monitoring for Clark, Colorado to the EPA. Each is listed above with its population served.
What contaminants are in Clark's water?
The contaminants EPA monitoring detected in Clark include Nitrate, Nitrate-Nitrite, Fluoride, Barium, TTHM. 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.