What was found in Montrose'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 | 5950 µg/L 60% of the EPA limit 10000 µg/L Highest in the city: MILLARD MOBILE HOME PARK · 90 people · 2019 | 6/14 | SYR4 |
| Nitrate-Nitrite | 5527 µg/L 55% of the EPA limit 10000 µg/L Highest in the city: MILLARD MOBILE HOME PARK · 90 people · 2019 | 5/14 | SYR4 |
| Fluoride | 743.7 µg/L 19% of the EPA limit 4000 µg/L Highest in the city: MILLARD MOBILE HOME PARK · 90 people · 2019 | 6/14 | SYR4 |
| Chloroform | 33.37 µg/L No EPA limit set Main supplier: TRI COUNTY WCD · 20,490 people · 2019
Highest in the city: 38.34 µg/L — MONTROSE CITY OF · 19,305 people · 2019 | 7/14 | SYR4 |
| TTHM | 32.485 µg/L 41% of the EPA limit 80 µg/L Main supplier: TRI COUNTY WCD · 20,490 people · 2019
Highest in the city: 37.22 µg/L — CIMARRON CREEK · 560 people · 2019 | 8/14 | SYR4 |
| Total Haloacetic Acids (HAA5) | 29.22 µg/L 49% of the EPA limit 60 µg/L Main supplier: TRI COUNTY WCD · 20,490 people · 2019
Highest in the city: 33.71 µg/L — MONTROSE CITY OF · 19,305 people · 2019 | 9/14 | SYR4 |
| Barium | 30.96 µg/L 1.5% of the EPA limit 2000 µg/L Highest in the city: EARLES SUBDIVISION WC · 40 people · 2019 | 6/14 | SYR4 |
| Dichloroacetic Acid | 14.03 µg/L No EPA limit set Main supplier: TRI COUNTY WCD · 20,490 people · 2019
Highest in the city: 17.505 µg/L — MENOKEN WD · 4,500 people · 2019 | 4/14 | SYR4 |
| Lithium | 14.4 µg/L No EPA limit set Main supplier: TRI COUNTY WCD · 20,490 people · 2024
Highest in the city: 16.9 µg/L — MONTROSE CITY OF · 19,305 people · 2025 | 4/14 | UCMR-5 |
| Trichloroacetic Acid | 14.9625 µg/L No EPA limit set Main supplier: TRI COUNTY WCD · 20,490 people · 2019
Highest in the city: 16.141 µg/L — CHIPETA WD · 3,802 people · 2019 | 4/14 | SYR4 |
| Gross Alpha, Excl. Radon And U | 13.6694 pCi/L 91% of the EPA limit 15 pCi/L Highest in the city: SUNRISE TRAILER PARK · 60 people · 2018 | 5/14 | SYR4 |
| Chromium | 11.56 µg/L 12% of the EPA limit 100 µg/L Highest in the city: SUNRISE TRAILER PARK · 60 people · 2018 | 5/14 | SYR4 |
| Selenium | 4.49 µg/L 9% of the EPA limit 50 µg/L Highest in the city: SPRING VIEW TP · 145 people · 2018 | 5/14 | SYR4 |
| Combined Uranium | 4 µg/L 13% of the EPA limit 30 µg/L Highest in the city: MILLARD MOBILE HOME PARK · 90 people · 2019 | 6/14 | SYR4 |
| Gross Beta Particle Activity | 3.8 pCi/L No EPA limit set Highest in the city: EARLES SUBDIVISION WC · 40 people · 2019 | 1/14 | SYR4 |
| Bromodichloromethane | 3.497 µg/L No EPA limit set Main supplier: TRI COUNTY WCD · 20,490 people · 2019
Highest in the city: 3.6095 µg/L — MONTROSE CITY OF · 19,305 people · 2019 | 7/14 | SYR4 |
| Combined Radium (-226 And -228) | 2.88 pCi/L 58% of the EPA limit 5 pCi/L Highest in the city: SPRING VIEW TP · 145 people · 2018 | 4/14 | SYR4 |
| Monochloroacetic Acid | 1.7535 µg/L No EPA limit set Main supplier: TRI COUNTY WCD · 20,490 people · 2019
Highest in the city: 2.122 µg/L — MONTROSE CITY OF · 19,305 people · 2019 | 4/14 | SYR4 |
| Arsenic | 1.38 µg/L 14% of the EPA limit 10 µg/L Highest in the city: MILLARD MOBILE HOME PARK · 90 people · 2019 | 5/14 | SYR4 |
| Dibromoacetic Acid | 1.15 µg/L No EPA limit set Main supplier: TRI COUNTY WCD · 20,490 people · 2019
Highest in the city: 1.207 µg/L — MONTROSE CITY OF · 19,305 people · 2019 | 4/14 | SYR4 |
| Hexachlorocyclopentadiene | 0.0970 µg/L 0.2% of the EPA limit 50 µg/L Highest in the city: PROJECT 7 WA · 0 people · 2019 | 1/14 | SYR4 |
| Pfba | 0.0295 µg/L No EPA limit set Highest in the city: CHIPETA WD · 3,802 people · 2023 | 1/14 | UCMR-5 |
| Lead | 0.0060 mg/L 40% of the EPA limit 0.0150 mg/L Main supplier: TRI COUNTY WCD · 20,490 people · 1999
Highest in the city: 0.0070 mg/L — HIDDEN LAKE COMMUNITY · 83 people · 2025 | 14/14 | 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 Montrose
| Supplier | Population served |
|---|---|
| TRI COUNTY WCD | 20,490 |
| MONTROSE CITY OF | 19,305 |
| MENOKEN WD | 4,500 |
| CHIPETA WD | 3,802 |
| CIMARRON CREEK | 560 |
| RIVER MEADOWS THE | 490 |
| BLACK CANYON ESTATES MHP | 188 |
| SPRING VIEW TP | 145 |
| MILLARD MOBILE HOME PARK | 90 |
| HIDDEN LAKE COMMUNITY | 83 |
| SUNRISE TRAILER PARK | 60 |
| EARLES SUBDIVISION WC | 40 |
| HARVEY MARTINEZ TRAILER COURT | 25 |
| PROJECT 7 WA | 0 |
Frequently asked questions about Montrose tap water
Is Montrose tap water safe to drink?
EPA testing detected 23 contaminants in the water serving Montrose. 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 Montrose?
14 public water suppliers report drinking-water monitoring for Montrose, Colorado to the EPA. Each is listed above with its population served.
What contaminants are in Montrose's water?
The contaminants EPA monitoring detected in Montrose include Nitrate, Nitrate-Nitrite, Fluoride, Chloroform, 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.