What was found in Bozeman'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-Nitrite | 160 µg/L 1.6% of the EPA limit 10000 µg/L Main supplier: BOZEMAN CITY OF · 56,000 people · 2019
Highest in the city: 7205.5 µg/L — MT ELLIS ACADEMY · 106 people · 2019 | 25/32 | SYR4 |
| Nitrate | 3300 µg/L 33% of the EPA limit 10000 µg/L Highest in the city: ELK GROVE WATER · 672 people · 2019 | 1/32 | SYR4 |
| Fluoride | 1104.5 µg/L 28% of the EPA limit 4000 µg/L Main supplier: BOZEMAN CITY OF · 56,000 people · 2019 | 22/32 | SYR4 |
| Copper | 113.85 µg/L 8.8% of the EPA limit 1300 µg/L Main supplier: BOZEMAN CITY OF · 56,000 people · 2018
Highest in the city: 1081 µg/L — COUNTRY COURT GALLATIN · 30 people · 2018 | 28/32 | SYR4 |
| Barium | 366.5 µg/L 18% of the EPA limit 2000 µg/L Highest in the city: MT ELLIS ACADEMY · 106 people · 2019 | 11/32 | SYR4 |
| TTHM | 39 µg/L 49% of the EPA limit 80 µg/L Main supplier: BOZEMAN CITY OF · 56,000 people · 2019 | 9/32 | SYR4 |
| Chloroform | 37 µg/L No EPA limit set Main supplier: BOZEMAN CITY OF · 56,000 people · 2019 | 7/32 | SYR4 |
| Total Haloacetic Acids (HAA5) | 27.4 µg/L 46% of the EPA limit 60 µg/L Main supplier: BOZEMAN CITY OF · 56,000 people · 2019 | 8/32 | SYR4 |
| Trichloroacetic Acid | 14.5 µg/L No EPA limit set Main supplier: BOZEMAN CITY OF · 56,000 people · 2019 | 5/32 | SYR4 |
| Lead | 12.35 µg/L 82% of the EPA limit 15 µg/L Main supplier: BOZEMAN CITY OF · 56,000 people · 2018
Highest in the city: 13.76 µg/L — NORTH STAR ZOOT WATER · 4,323 people · 2018 | 27/32 | SYR4 |
| Dichloroacetic Acid | 13.45 µg/L No EPA limit set Main supplier: BOZEMAN CITY OF · 56,000 people · 2019 | 6/32 | SYR4 |
| Chromium | 9.9 µg/L 9.9% of the EPA limit 100 µg/L Highest in the city: SPIRIT HILLS SUBDIVISION · 230 people · 2019 | 4/32 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.045 pCi/L 20% of the EPA limit 15 pCi/L Main supplier: BOZEMAN CITY OF · 56,000 people · 2018
Highest in the city: 9.41 pCi/L — RAE WATER AND SEWER DIST 313 · 2,325 people · 2018 | 12/32 | SYR4 |
| Combined Uranium | 0.6850 µg/L 2.3% of the EPA limit 30 µg/L Main supplier: BOZEMAN CITY OF · 56,000 people · 2018
Highest in the city: 7 µg/L — HIDDEN VALLEY OWNER LLC · 200 people · 2014 | 16/32 | SYR4 |
| Bromodichloromethane | 2 µg/L No EPA limit set Main supplier: BOZEMAN CITY OF · 56,000 people · 2019
Highest in the city: 5.98 µg/L — BRIDGER BASE WATER SYSTEM · 75 people · 2019 | 9/32 | SYR4 |
| Dibromochloromethane | 5.535 µg/L No EPA limit set Highest in the city: NORTH STAR ZOOT WATER · 4,323 people · 2019 | 6/32 | SYR4 |
| Arsenic | 4 µg/L 40% of the EPA limit 10 µg/L Highest in the city: ROCKY CREEK TR COURT · 35 people · 2019 | 13/32 | SYR4 |
| Bromoform | 3.582 µg/L No EPA limit set Highest in the city: HIDDEN VALLEY OWNER LLC · 200 people · 2019 | 2/32 | SYR4 |
| Dibromoacetic Acid | 3.305 µg/L No EPA limit set Highest in the city: HIDDEN VALLEY OWNER LLC · 200 people · 2017 | 6/32 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 2.79 µg/L 47% of the EPA limit 6 µg/L Highest in the city: VALLEY GROVE SUBDIVISION · 825 people · 2019 | 1/32 | SYR4 |
| Combined Radium (-226 And -228) | 2.155 pCi/L 43% of the EPA limit 5 pCi/L Highest in the city: VALLEY GROVE SUBDIVISION · 825 people · 2015 | 6/32 | SYR4 |
| Selenium | 1.95 µg/L 3.9% of the EPA limit 50 µg/L Highest in the city: FRANKLIN HILLS SUBDIVISION · 50 people · 2017 | 2/32 | SYR4 |
| Xylenes, Total | 1.4715 µg/L 0% of the EPA limit 10000 µg/L Highest in the city: LAZY J SOUTH SUBDIVISION · 122 people · 2019 | 2/32 | SYR4 |
| Monochloroacetic Acid | 1.116 µg/L No EPA limit set Main supplier: BOZEMAN CITY OF · 56,000 people · 2019 | 1/32 | SYR4 |
| Di(2-ethylhexyl) Adipate | 0.8600 µg/L 0.2% of the EPA limit 400 µg/L Highest in the city: MYSTIC HEIGHTS HOA BOZEMAN · 96 people · 2019 | 1/32 | SYR4 |
| Toluene | 0.7190 µg/L 0.1% of the EPA limit 1000 µg/L Highest in the city: NORTH STAR ZOOT WATER · 4,323 people · 2019 | 1/32 | SYR4 |
| Lead | 0.0016 mg/L 11% of the EPA limit 0.0150 mg/L Main supplier: BOZEMAN CITY OF · 56,000 people · 2025
Highest in the city: 0.0070 mg/L — HIDDEN VALLEY OWNER LLC · 200 people · 2017 | 32/32 | 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 Bozeman
Frequently asked questions about Bozeman tap water
Is Bozeman tap water safe to drink?
EPA testing detected 27 contaminants in the water serving Bozeman. 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 Bozeman?
32 public water suppliers report drinking-water monitoring for Bozeman, Montana to the EPA. Each is listed above with its population served.
What contaminants are in Bozeman's water?
The contaminants EPA monitoring detected in Bozeman include Nitrate-Nitrite, Nitrate, Fluoride, Copper, Barium. 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.