What was found in Silverthorne'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 | 808.5 µg/L 8.1% of the EPA limit 10000 µg/L Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2019
Highest in the city: 3000 µg/L — TANGLEWOOD WS · 60 people · 2019 | 7/7 | SYR4 |
| Nitrate-Nitrite | 985.5 µg/L 9.9% of the EPA limit 10000 µg/L Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2015 | 4/7 | SYR4 |
| Fluoride | 580 µg/L 14% of the EPA limit 4000 µg/L Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2018 | 7/7 | SYR4 |
| Barium | 140.75 µg/L 7% of the EPA limit 2000 µg/L Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2019
Highest in the city: 251.5 µg/L — HEENEY WATER DISTRICT · 150 people · 2019 | 7/7 | SYR4 |
| Chloroform | 1.925 µg/L No EPA limit set Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2019
Highest in the city: 90.6 µg/L — TIMBER CREEK WD · 312 people · 2013 | 4/7 | SYR4 |
| Lithium | 25 µg/L No EPA limit set Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2025 | 1/7 | UCMR-5 |
| TTHM | 15.335 µg/L 19% of the EPA limit 80 µg/L Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2019
Highest in the city: 22.05 µg/L — BUFFALO MOUNTAIN MD · 2,650 people · 2019 | 6/7 | SYR4 |
| Bromodichloromethane | 3.95 µg/L No EPA limit set Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2019
Highest in the city: 14.76 µg/L — TIMBER CREEK WD · 312 people · 2013 | 4/7 | SYR4 |
| Bromoform | 2.075 µg/L No EPA limit set Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2019
Highest in the city: 13.08 µg/L — TANGLEWOOD WS · 60 people · 2017 | 5/7 | SYR4 |
| Total Haloacetic Acids (HAA5) | 3.315 µg/L 5.5% of the EPA limit 60 µg/L Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2019
Highest in the city: 7.7 µg/L — BUFFALO MOUNTAIN MD · 2,650 people · 2019 | 7/7 | SYR4 |
| Dibromochloromethane | 5.36 µg/L No EPA limit set Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2019
Highest in the city: 5.54 µg/L — BUFFALO MOUNTAIN MD · 2,650 people · 2019 | 5/7 | SYR4 |
| Dibromoacetic Acid | 1.9 µg/L No EPA limit set Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2019
Highest in the city: 5 µg/L — TANGLEWOOD WS · 60 people · 2017 | 3/7 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.075 pCi/L 21% of the EPA limit 15 pCi/L Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2015
Highest in the city: 3.63 pCi/L — HEENEY WATER DISTRICT · 150 people · 2019 | 7/7 | SYR4 |
| Combined Radium (-226 And -228) | 0.3700 pCi/L 7.4% of the EPA limit 5 pCi/L Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2013
Highest in the city: 3.1 pCi/L — BUFFALO MOUNTAIN MD · 2,650 people · 2017 | 7/7 | SYR4 |
| Combined Uranium | 1.302 µg/L 4.3% of the EPA limit 30 µg/L Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2015
Highest in the city: 3 µg/L — SAGE CREEK CANYON CORP · 192 people · 2019 | 6/7 | SYR4 |
| Arsenic | 2.95 µg/L 30% of the EPA limit 10 µg/L Highest in the city: TANGLEWOOD WS · 60 people · 2017 | 2/7 | SYR4 |
| Chromium | 1 µg/L 1% of the EPA limit 100 µg/L Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2019
Highest in the city: 2.9 µg/L — TANGLEWOOD WS · 60 people · 2017 | 4/7 | SYR4 |
| Xylenes, Total | 2.46 µg/L 0% of the EPA limit 10000 µg/L Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2019 | 1/7 | SYR4 |
| Antimony, Total | 2 µg/L 33% of the EPA limit 6 µg/L Highest in the city: BLUE RIVER VALLEY RANCH LAKES · 150 people · 2017 | 2/7 | SYR4 |
| Dichloroacetic Acid | 1.955 µg/L No EPA limit set Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2019 | 2/7 | SYR4 |
| Selenium | 1.9 µg/L 3.8% of the EPA limit 50 µg/L Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2019
Highest in the city: 1.95 µg/L — TANGLEWOOD WS · 60 people · 2017 | 5/7 | SYR4 |
| Trichloroacetic Acid | 1.4 µg/L No EPA limit set Highest in the city: BUFFALO MOUNTAIN MD · 2,650 people · 2019 | 1/7 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.7900 µg/L 13% of the EPA limit 6 µg/L Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2019 | 1/7 | SYR4 |
| Cadmium | 0.2100 µg/L 4.2% of the EPA limit 5 µg/L Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2019 | 1/7 | SYR4 |
| Mercury | 0.1200 µg/L 6% of the EPA limit 2 µg/L Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2019 | 1/7 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2025
Highest in the city: 0.0150 mg/L — TANGLEWOOD WS · 60 people · 2026 | 7/7 | LCR |
| PFBS | 0.0059 µg/L No EPA limit set Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2025 | 1/7 | UCMR-5 |
| PFHXS | 0.0037 µg/L No EPA limit set Main supplier: SILVERTHORNE TOWN OF · 8,400 people · 2025 | 1/7 | 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 Silverthorne
| Supplier | Population served |
|---|---|
| SILVERTHORNE TOWN OF | 8,400 |
| BUFFALO MOUNTAIN MD | 2,650 |
| TIMBER CREEK WD | 312 |
| SAGE CREEK CANYON CORP | 192 |
| BLUE RIVER VALLEY RANCH LAKES | 150 |
| HEENEY WATER DISTRICT | 150 |
| TANGLEWOOD WS | 60 |
Frequently asked questions about Silverthorne tap water
Is Silverthorne tap water safe to drink?
EPA testing detected 28 contaminants in the water serving Silverthorne. 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 Silverthorne?
7 public water suppliers report drinking-water monitoring for Silverthorne, Colorado to the EPA. Each is listed above with its population served.
What contaminants are in Silverthorne's water?
The contaminants EPA monitoring detected in Silverthorne include Nitrate, Nitrate-Nitrite, Fluoride, Barium, 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.