What was found in Telluride'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 | 420 µg/L 4.2% of the EPA limit 10000 µg/L Main supplier: TELLURIDE TOWN OF · 7,900 people · 2019
Highest in the city: 1335 µg/L — ALDASORO RANCH HOC · 412 people · 2019 | 4/5 | SYR4 |
| Nitrate-Nitrite | 288 µg/L 2.9% of the EPA limit 10000 µg/L Main supplier: TELLURIDE TOWN OF · 7,900 people · 2015
Highest in the city: 1000 µg/L — ALDASORO RANCH HOC · 412 people · 2015 | 4/5 | SYR4 |
| Fluoride | 130 µg/L 3.3% of the EPA limit 4000 µg/L Main supplier: TELLURIDE TOWN OF · 7,900 people · 2019
Highest in the city: 212.75 µg/L — LAST DOLLAR PUD · 96 people · 2019 | 3/5 | SYR4 |
| TTHM | 29.6 µg/L 37% of the EPA limit 80 µg/L Main supplier: TELLURIDE TOWN OF · 7,900 people · 2019
Highest in the city: 72.39 µg/L — WILSON MESA · 290 people · 2019 | 4/5 | SYR4 |
| Chloroform | 30.13 µg/L No EPA limit set Main supplier: TELLURIDE TOWN OF · 7,900 people · 2019
Highest in the city: 55.18 µg/L — WILSON MESA · 290 people · 2019 | 3/5 | SYR4 |
| Barium | 45.3 µg/L 2.3% of the EPA limit 2000 µg/L Main supplier: TELLURIDE TOWN OF · 7,900 people · 2019
Highest in the city: 47.08 µg/L — LAST DOLLAR PUD · 96 people · 2019 | 4/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 27.535 µg/L 46% of the EPA limit 60 µg/L Main supplier: TELLURIDE TOWN OF · 7,900 people · 2019
Highest in the city: 37.25 µg/L — WILSON MESA · 290 people · 2019 | 3/5 | SYR4 |
| Dichloroacetic Acid | 18.402 µg/L No EPA limit set Main supplier: TELLURIDE TOWN OF · 7,900 people · 2019
Highest in the city: 22.465 µg/L — WILSON MESA · 290 people · 2019 | 3/5 | SYR4 |
| Arsenic | 6.935 µg/L 69% of the EPA limit 10 µg/L Main supplier: TELLURIDE TOWN OF · 7,900 people · 2019
Highest in the city: 17.3 µg/L — LAST DOLLAR PUD · 96 people · 2019 | 2/5 | SYR4 |
| Trichloroacetic Acid | 12.218 µg/L No EPA limit set Main supplier: TELLURIDE TOWN OF · 7,900 people · 2019
Highest in the city: 16 µg/L — WILSON MESA · 290 people · 2019 | 3/5 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.7000 pCi/L 4.7% of the EPA limit 15 pCi/L Main supplier: TELLURIDE TOWN OF · 7,900 people · 2015
Highest in the city: 10.205 pCi/L — LAST DOLLAR PUD · 96 people · 2019 | 4/5 | SYR4 |
| Chromium | 1 µg/L 1% of the EPA limit 100 µg/L Main supplier: TELLURIDE TOWN OF · 7,900 people · 2019
Highest in the city: 8.6 µg/L — LAST DOLLAR PUD · 96 people · 2019 | 2/5 | SYR4 |
| Bromodichloromethane | 2.7 µg/L No EPA limit set Main supplier: TELLURIDE TOWN OF · 7,900 people · 2019
Highest in the city: 7.25 µg/L — WILSON MESA · 290 people · 2019 | 3/5 | SYR4 |
| Xylenes, Total | 6.27 µg/L 0.1% of the EPA limit 10000 µg/L Highest in the city: ALDASORO RANCH HOC · 412 people · 2019 | 1/5 | SYR4 |
| Monochloroacetic Acid | 1.3995 µg/L No EPA limit set Main supplier: TELLURIDE TOWN OF · 7,900 people · 2019
Highest in the city: 3 µg/L — WILSON MESA · 290 people · 2019 | 3/5 | SYR4 |
| Gross Beta Particle Activity | 2.9 pCi/L No EPA limit set Highest in the city: LAST DOLLAR PUD · 96 people · 2019 | 1/5 | SYR4 |
| Dibromochloromethane | 2.825 µg/L No EPA limit set Highest in the city: ALDASORO RANCH HOC · 412 people · 2019 | 2/5 | SYR4 |
| Combined Radium (-226 And -228) | 0.3900 pCi/L 7.8% of the EPA limit 5 pCi/L Main supplier: TELLURIDE TOWN OF · 7,900 people · 2015
Highest in the city: 2.42 pCi/L — LAST DOLLAR PUD · 96 people · 2019 | 4/5 | SYR4 |
| Combined Uranium | 1.99 µg/L 6.6% of the EPA limit 30 µg/L Highest in the city: LAST DOLLAR PUD · 96 people · 2019 | 2/5 | SYR4 |
| Dibromoacetic Acid | 1.4 µg/L No EPA limit set Highest in the city: WILSON MESA · 290 people · 2019 | 2/5 | SYR4 |
| Antimony, Total | 1 µg/L 17% of the EPA limit 6 µg/L Main supplier: TELLURIDE TOWN OF · 7,900 people · 2019
Highest in the city: 1.3 µg/L — LAST DOLLAR PUD · 96 people · 2019 | 2/5 | SYR4 |
| Selenium | 1.3 µg/L 2.6% of the EPA limit 50 µg/L Highest in the city: LAST DOLLAR PUD · 96 people · 2019 | 3/5 | SYR4 |
| Bromoform | 0.8115 µg/L No EPA limit set Highest in the city: WILSON MESA · 290 people · 2019 | 2/5 | SYR4 |
| Ethylbenzene | 0.7710 µg/L 0.1% of the EPA limit 700 µg/L Highest in the city: ALDASORO RANCH HOC · 412 people · 2019 | 1/5 | SYR4 |
| Cadmium | 0.2900 µg/L 5.8% of the EPA limit 5 µg/L Highest in the city: LAST DOLLAR PUD · 96 people · 2019 | 1/5 | SYR4 |
| Hexachlorocyclopentadiene | 0.1700 µg/L 0.3% of the EPA limit 50 µg/L Highest in the city: WILSON MESA · 290 people · 2019 | 1/5 | SYR4 |
| Thallium, Total | 0.1000 µg/L 5% of the EPA limit 2 µg/L Highest in the city: LAST DOLLAR PUD · 96 people · 2019 | 1/5 | SYR4 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: TELLURIDE TOWN OF · 7,900 people · 2025
Highest in the city: 0.0119 mg/L — LAST DOLLAR PUD · 96 people · 2025 | 5/5 | LCR |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0100 µg/L 5% of the EPA limit 0.2000 µg/L Highest in the city: LAST DOLLAR PUD · 96 people · 2019 | 1/5 | 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 Telluride
| Supplier | Population served |
|---|---|
| TELLURIDE TOWN OF | 7,900 |
| ALDASORO RANCH HOC | 412 |
| WILSON MESA | 290 |
| SAN BERNARDO HOA | 132 |
| LAST DOLLAR PUD | 96 |
Frequently asked questions about Telluride tap water
Is Telluride tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Telluride. 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 Telluride?
5 public water suppliers report drinking-water monitoring for Telluride, Colorado to the EPA. Each is listed above with its population served.
What contaminants are in Telluride's water?
The contaminants EPA monitoring detected in Telluride include Nitrate, Nitrate-Nitrite, Fluoride, TTHM, Chloroform. 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.