What was found in Gunnison'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 | 1200 µg/L 12% of the EPA limit 10000 µg/L Main supplier: GUNNISON CITY OF · 9,610 people · 2018
Highest in the city: 4600 µg/L — NORTH VALLEY SUBDIVISION UTILITY COMPANY · 79 people · 2019 | 3/4 | SYR4 |
| Nitrate-Nitrite | 1201 µg/L 12% of the EPA limit 10000 µg/L Main supplier: GUNNISON CITY OF · 9,610 people · 2019
Highest in the city: 1800 µg/L — NORTH VALLEY SUBDIVISION UTILITY COMPANY · 79 people · 2018 | 3/4 | SYR4 |
| Fluoride | 130 µg/L 3.3% of the EPA limit 4000 µg/L Main supplier: GUNNISON CITY OF · 9,610 people · 2018
Highest in the city: 317 µg/L — NORTH VALLEY SUBDIVISION UTILITY COMPANY · 79 people · 2018 | 3/4 | SYR4 |
| Barium | 155 µg/L 7.8% of the EPA limit 2000 µg/L Main supplier: GUNNISON CITY OF · 9,610 people · 2018 | 3/4 | SYR4 |
| TTHM | 10.34 µg/L 13% of the EPA limit 80 µg/L Main supplier: GUNNISON CITY OF · 9,610 people · 2019
Highest in the city: 39.625 µg/L — GUNNISON COUNTY WSD · 800 people · 2019 | 4/4 | SYR4 |
| Chloroform | 0.9720 µg/L No EPA limit set Main supplier: GUNNISON CITY OF · 9,610 people · 2019
Highest in the city: 31.86 µg/L — ANTELOPE HILLS ASSOC · 265 people · 2019 | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 4.06 µg/L 6.8% of the EPA limit 60 µg/L Main supplier: GUNNISON CITY OF · 9,610 people · 2019
Highest in the city: 28.7 µg/L — GUNNISON COUNTY WSD · 800 people · 2019 | 4/4 | SYR4 |
| Trichloroacetic Acid | 17.35 µg/L No EPA limit set Highest in the city: ANTELOPE HILLS ASSOC · 265 people · 2019 | 2/4 | SYR4 |
| Dichloroacetic Acid | 10.94 µg/L No EPA limit set Highest in the city: ANTELOPE HILLS ASSOC · 265 people · 2019 | 2/4 | SYR4 |
| Antimony, Total | 9.57 µg/L 160% of the EPA limit, at the 95th percentile of samples — 6 µg/L Main supplier: GUNNISON CITY OF · 9,610 people · 2019 | 1/4 | SYR4 |
| Bromoform | 5.06 µg/L No EPA limit set Main supplier: GUNNISON CITY OF · 9,610 people · 2019
Highest in the city: 7.29 µg/L — NORTH VALLEY SUBDIVISION UTILITY COMPANY · 79 people · 2018 | 2/4 | SYR4 |
| Bromodichloromethane | 1.64 µg/L No EPA limit set Main supplier: GUNNISON CITY OF · 9,610 people · 2019
Highest in the city: 5.84 µg/L — ANTELOPE HILLS ASSOC · 265 people · 2019 | 4/4 | SYR4 |
| Dibromochloromethane | 3.72 µg/L No EPA limit set Main supplier: GUNNISON CITY OF · 9,610 people · 2019
Highest in the city: 5.18 µg/L — NORTH VALLEY SUBDIVISION UTILITY COMPANY · 79 people · 2018 | 4/4 | SYR4 |
| Combined Uranium | 2.715 µg/L 9% of the EPA limit 30 µg/L Main supplier: GUNNISON CITY OF · 9,610 people · 2019
Highest in the city: 5 µg/L — NORTH VALLEY SUBDIVISION UTILITY COMPANY · 79 people · 2019 | 3/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 2.82935 pCi/L 19% of the EPA limit 15 pCi/L Main supplier: GUNNISON CITY OF · 9,610 people · 2019
Highest in the city: 3.85 pCi/L — NORTH VALLEY SUBDIVISION UTILITY COMPANY · 79 people · 2019 | 3/4 | SYR4 |
| Dibromoacetic Acid | 2.285 µg/L No EPA limit set Main supplier: GUNNISON CITY OF · 9,610 people · 2019
Highest in the city: 3.428 µg/L — NORTH VALLEY SUBDIVISION UTILITY COMPANY · 79 people · 2018 | 2/4 | SYR4 |
| Selenium | 0.9830 µg/L 2% of the EPA limit 50 µg/L Main supplier: GUNNISON CITY OF · 9,610 people · 2018
Highest in the city: 2.9 µg/L — NORTH VALLEY SUBDIVISION UTILITY COMPANY · 79 people · 2018 | 2/4 | SYR4 |
| Combined Radium (-226 And -228) | 2.7 pCi/L 54% of the EPA limit 5 pCi/L Main supplier: GUNNISON CITY OF · 9,610 people · 2019 | 3/4 | SYR4 |
| Monochloroacetic Acid | 2.3 µg/L No EPA limit set Main supplier: GUNNISON CITY OF · 9,610 people · 2019
Highest in the city: 2.4 µg/L — GUNNISON COUNTY WSD · 800 people · 2018 | 3/4 | SYR4 |
| Arsenic | 2 µg/L 20% of the EPA limit 10 µg/L Highest in the city: NORTH VALLEY SUBDIVISION UTILITY COMPANY · 79 people · 2018 | 1/4 | SYR4 |
| Chromium | 2 µg/L 2% of the EPA limit 100 µg/L Highest in the city: NORTH VALLEY SUBDIVISION UTILITY COMPANY · 79 people · 2018 | 1/4 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.464 µg/L 24% of the EPA limit 6 µg/L Main supplier: GUNNISON CITY OF · 9,610 people · 2019 | 1/4 | SYR4 |
| Hexachlorocyclopentadiene | 0.0760 µg/L 0.2% of the EPA limit 50 µg/L Highest in the city: NORTH VALLEY SUBDIVISION UTILITY COMPANY · 79 people · 2018 | 1/4 | SYR4 |
| Pentachlorophenol | 0.0430 µg/L 4.3% of the EPA limit 1 µg/L Main supplier: GUNNISON CITY OF · 9,610 people · 2019 | 1/4 | SYR4 |
| Pfhxa | 0.0072 µg/L No EPA limit set Main supplier: GUNNISON CITY OF · 9,610 people · 2024 | 1/4 | UCMR-5 |
| Pfpea | 0.0051 µg/L No EPA limit set Main supplier: GUNNISON CITY OF · 9,610 people · 2024 | 1/4 | UCMR-5 |
| PFOS | 0.0042 µg/L No EPA limit set Main supplier: GUNNISON CITY OF · 9,610 people · 2024 | 1/4 | UCMR-5 |
| Lead | 0.0030 mg/L 20% of the EPA limit 0.0150 mg/L Main supplier: GUNNISON CITY OF · 9,610 people · 2025 | 4/4 | LCR |
| PFBS | 0.0030 µg/L No EPA limit set Main supplier: GUNNISON CITY OF · 9,610 people · 2024 | 1/4 | 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 Gunnison
| Supplier | Population served |
|---|---|
| GUNNISON CITY OF | 9,610 |
| GUNNISON COUNTY WSD | 800 |
| ANTELOPE HILLS ASSOC | 265 |
| NORTH VALLEY SUBDIVISION UTILITY COMPANY | 79 |
Frequently asked questions about Gunnison tap water
Is Gunnison tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Gunnison. 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 Gunnison?
4 public water suppliers report drinking-water monitoring for Gunnison, Colorado to the EPA. Each is listed above with its population served.
What contaminants are in Gunnison's water?
The contaminants EPA monitoring detected in Gunnison 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.