What was found in Keystone'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 | 412 µg/L 4.1% of the EPA limit 10000 µg/L Main supplier: SNAKE RIVER WD · 9,900 people · 2019
Highest in the city: 1700 µg/L — KEYSTONE RANCH · 670 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 388 µg/L 3.9% of the EPA limit 10000 µg/L Main supplier: SNAKE RIVER WD · 9,900 people · 2019 | 1/2 | SYR4 |
| Fluoride | 387 µg/L 9.7% of the EPA limit 4000 µg/L Highest in the city: KEYSTONE RANCH · 670 people · 2018 | 1/2 | SYR4 |
| Barium | 26.85 µg/L 1.3% of the EPA limit 2000 µg/L Main supplier: SNAKE RIVER WD · 9,900 people · 2017
Highest in the city: 150 µg/L — KEYSTONE RANCH · 670 people · 2018 | 2/2 | SYR4 |
| TTHM | 4.2 µg/L 5.3% of the EPA limit 80 µg/L Main supplier: SNAKE RIVER WD · 9,900 people · 2019
Highest in the city: 8.13 µg/L — KEYSTONE RANCH · 670 people · 2018 | 2/2 | SYR4 |
| Bromodichloromethane | 1.42 µg/L No EPA limit set Main supplier: SNAKE RIVER WD · 9,900 people · 2019
Highest in the city: 2.905 µg/L — KEYSTONE RANCH · 670 people · 2018 | 2/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 2.6 µg/L 43% of the EPA limit 6 µg/L Main supplier: SNAKE RIVER WD · 9,900 people · 2019 | 1/2 | SYR4 |
| Chloroform | 0.9470 µg/L No EPA limit set Main supplier: SNAKE RIVER WD · 9,900 people · 2019
Highest in the city: 2.5155 µg/L — KEYSTONE RANCH · 670 people · 2018 | 2/2 | SYR4 |
| Dibromochloromethane | 1.655 µg/L No EPA limit set Main supplier: SNAKE RIVER WD · 9,900 people · 2019
Highest in the city: 2.43 µg/L — KEYSTONE RANCH · 670 people · 2018 | 2/2 | SYR4 |
| Dichloroacetic Acid | 1.4 µg/L No EPA limit set Main supplier: SNAKE RIVER WD · 9,900 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 1.38 µg/L 2.3% of the EPA limit 60 µg/L Main supplier: SNAKE RIVER WD · 9,900 people · 2019 | 2/2 | SYR4 |
| Bromoform | 0.7910 µg/L No EPA limit set Main supplier: SNAKE RIVER WD · 9,900 people · 2019 | 2/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.5000 pCi/L 3.3% of the EPA limit 15 pCi/L Highest in the city: KEYSTONE RANCH · 670 people · 2012 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 0.2760 pCi/L 5.5% of the EPA limit 5 pCi/L Main supplier: SNAKE RIVER WD · 9,900 people · 2016 | 2/2 | SYR4 |
| Lead | 0.00090 mg/L 6% of the EPA limit 0.0150 mg/L Main supplier: SNAKE RIVER WD · 9,900 people · 2025
Highest in the city: 0.0320 mg/L — KEYSTONE RANCH · 670 people · 2025 | 2/2 | LCR |
| PFOS | 0.0220 µg/L No EPA limit set Main supplier: SNAKE RIVER WD · 9,900 people · 2023 | 1/2 | UCMR-5 |
| PFHXS | 0.0130 µg/L No EPA limit set Main supplier: SNAKE RIVER WD · 9,900 people · 2023 | 1/2 | UCMR-5 |
| Pfpea | 0.0080 µg/L No EPA limit set Main supplier: SNAKE RIVER WD · 9,900 people · 2023 | 1/2 | UCMR-5 |
| PFBS | 0.0066 µg/L No EPA limit set Main supplier: SNAKE RIVER WD · 9,900 people · 2023 | 1/2 | UCMR-5 |
| Pfhxa | 0.0063 µg/L No EPA limit set Main supplier: SNAKE RIVER WD · 9,900 people · 2023 | 1/2 | UCMR-5 |
| PFOA | 0.0058 µg/L No EPA limit set Main supplier: SNAKE RIVER WD · 9,900 people · 2023 | 1/2 | UCMR-5 |
| Pfhpa | 0.0042 µg/L No EPA limit set Main supplier: SNAKE RIVER WD · 9,900 people · 2023 | 1/2 | UCMR-5 |
| Hexachlorobenzene | 0.00080 µg/L 0.1% of the EPA limit 1 µg/L Main supplier: SNAKE RIVER WD · 9,900 people · 2018 | 1/2 | SYR4 |
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 Keystone
| Supplier | Population served |
|---|---|
| SNAKE RIVER WD | 9,900 |
| KEYSTONE RANCH | 670 |
Frequently asked questions about Keystone tap water
Is Keystone tap water safe to drink?
EPA testing detected 23 contaminants in the water serving Keystone. 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 Keystone?
2 public water suppliers report drinking-water monitoring for Keystone, Colorado to the EPA. Each is listed above with its population served.
What contaminants are in Keystone's water?
The contaminants EPA monitoring detected in Keystone 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.