What was found in Corvallis'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 | 1570 µg/L 16% of the EPA limit 10000 µg/L Main supplier: CORVALLIS MOBILE VILLAGE · 138 people · 2019
Highest in the city: 2572 µg/L — PONDEROSA MOBILE HOME PARK · 60 people · 2019 | 3/3 | SYR4 |
| Nitrate | 2220 µg/L 22% of the EPA limit 10000 µg/L Highest in the city: PONDEROSA MOBILE HOME PARK · 60 people · 2017 | 2/3 | SYR4 |
| Fluoride | 300 µg/L 7.5% of the EPA limit 4000 µg/L Main supplier: CORVALLIS MOBILE VILLAGE · 138 people · 2012
Highest in the city: 800 µg/L — PONDEROSA MOBILE HOME PARK · 60 people · 2017 | 3/3 | SYR4 |
| Copper | 375.7 µg/L 29% of the EPA limit 1300 µg/L Main supplier: CORVALLIS MOBILE VILLAGE · 138 people · 2019 | 3/3 | SYR4 |
| Barium | 79 µg/L 4% of the EPA limit 2000 µg/L Highest in the city: CENTENNIAL HOMEOWNER'S ASSOCIATION, INC · 115 people · 2019 | 1/3 | SYR4 |
| Lead | 5.75 µg/L 38% of the EPA limit 15 µg/L Main supplier: CORVALLIS MOBILE VILLAGE · 138 people · 2019
Highest in the city: 15 µg/L — PONDEROSA MOBILE HOME PARK · 60 people · 2019 | 3/3 | SYR4 |
| Arsenic | 7 µg/L 70% of the EPA limit 10 µg/L Main supplier: CORVALLIS MOBILE VILLAGE · 138 people · 2018
Highest in the city: 10 µg/L — PONDEROSA MOBILE HOME PARK · 60 people · 2017 | 3/3 | SYR4 |
| Combined Uranium | 4 µg/L 13% of the EPA limit 30 µg/L Main supplier: CORVALLIS MOBILE VILLAGE · 138 people · 2014
Highest in the city: 6 µg/L — PONDEROSA MOBILE HOME PARK · 60 people · 2016 | 2/3 | SYR4 |
| Gross Beta Particle Activity | 4.4 pCi/L No EPA limit set Main supplier: CORVALLIS MOBILE VILLAGE · 138 people · 2014 | 1/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.6 pCi/L 11% of the EPA limit 15 pCi/L Main supplier: CORVALLIS MOBILE VILLAGE · 138 people · 2014
Highest in the city: 4.2 pCi/L — PONDEROSA MOBILE HOME PARK · 60 people · 2016 | 2/3 | SYR4 |
| TTHM | 3.02 µg/L 3.8% of the EPA limit 80 µg/L Main supplier: CORVALLIS MOBILE VILLAGE · 138 people · 2019 | 1/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 1.844 µg/L 3.1% of the EPA limit 60 µg/L Main supplier: CORVALLIS MOBILE VILLAGE · 138 people · 2019 | 1/3 | SYR4 |
| Bromodichloromethane | 1.18 µg/L No EPA limit set Main supplier: CORVALLIS MOBILE VILLAGE · 138 people · 2019 | 1/3 | SYR4 |
| Dichloroacetic Acid | 1.1 µg/L No EPA limit set Main supplier: CORVALLIS MOBILE VILLAGE · 138 people · 2019 | 1/3 | SYR4 |
| Dibromochloromethane | 1.083 µg/L No EPA limit set Main supplier: CORVALLIS MOBILE VILLAGE · 138 people · 2019 | 1/3 | SYR4 |
| Combined Radium (-226 And -228) | 1 pCi/L 20% of the EPA limit 5 pCi/L Highest in the city: CENTENNIAL HOMEOWNER'S ASSOCIATION, INC · 115 people · 2013 | 1/3 | SYR4 |
| Chloroform | 0.8175 µg/L No EPA limit set Main supplier: CORVALLIS MOBILE VILLAGE · 138 people · 2019 | 1/3 | SYR4 |
| Dibromoacetic Acid | 0.6290 µg/L No EPA limit set Main supplier: CORVALLIS MOBILE VILLAGE · 138 people · 2019 | 1/3 | SYR4 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: CORVALLIS MOBILE VILLAGE · 138 people · 2025
Highest in the city: 0.0100 mg/L — PONDEROSA MOBILE HOME PARK · 60 people · 2025 | 3/3 | LCR |
Water suppliers serving Corvallis
| Supplier | Population served |
|---|---|
| CORVALLIS MOBILE VILLAGE | 138 |
| CENTENNIAL HOMEOWNER'S ASSOCIATION, INC | 115 |
| PONDEROSA MOBILE HOME PARK | 60 |
Frequently asked questions about Corvallis tap water
Is Corvallis tap water safe to drink?
EPA testing detected 19 contaminants in the water serving Corvallis. 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 Corvallis?
3 public water suppliers report drinking-water monitoring for Corvallis, Montana to the EPA. Each is listed above with its population served.
What contaminants are in Corvallis's water?
The contaminants EPA monitoring detected in Corvallis 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.