What was found in Oregon'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 | 6020 µg/L 60% of the EPA limit 10000 µg/L Main supplier: OREGON WATERWORKS · 11,200 people · 2017
Highest in the city: 11550 µg/L — COUNTRY VINEYARD 4 · 28 people · 2019 | 4/4 | SYR4 |
| Nitrate-Nitrite | 5613 µg/L 56% of the EPA limit 10000 µg/L Main supplier: OREGON WATERWORKS · 11,200 people · 2019 | 4/4 | SYR4 |
| Copper | 306 µg/L 24% of the EPA limit 1300 µg/L Main supplier: OREGON WATERWORKS · 11,200 people · 2017
Highest in the city: 1046.2 µg/L — OAKHILL CORRECTIONAL INST · 1,096 people · 2017 | 4/4 | SYR4 |
| Fluoride | 962 µg/L 24% of the EPA limit 4000 µg/L Main supplier: OREGON WATERWORKS · 11,200 people · 2019 | 3/4 | SYR4 |
| Barium | 26.5 µg/L 1.3% of the EPA limit 2000 µg/L Main supplier: OREGON WATERWORKS · 11,200 people · 2017
Highest in the city: 196.05 µg/L — OAKHILL CORRECTIONAL INST · 1,096 people · 2017 | 4/4 | SYR4 |
| Lead | 115.95 µg/L 773% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: OREGON WATERWORKS · 11,200 people · 2017
Highest in the city: 118 µg/L — OAKHILL CORRECTIONAL INST · 1,096 people · 2017 | 4/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.345 pCi/L 29% of the EPA limit 15 pCi/L Main supplier: OREGON WATERWORKS · 11,200 people · 2017
Highest in the city: 7.7985 pCi/L — OAKHILL CORRECTIONAL INST · 1,096 people · 2014 | 3/4 | SYR4 |
| TTHM | 5.733 µg/L 7.2% of the EPA limit 80 µg/L Main supplier: OREGON WATERWORKS · 11,200 people · 2019 | 2/4 | SYR4 |
| Gross Beta Particle Activity | 3.777 pCi/L No EPA limit set Highest in the city: OAKHILL CORRECTIONAL INST · 1,096 people · 2014 | 1/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 3.0304 µg/L 5.1% of the EPA limit 60 µg/L Highest in the city: OAKHILL CORRECTIONAL INST · 1,096 people · 2019 | 1/4 | SYR4 |
| Monochloroacetic Acid | 2.4475 µg/L No EPA limit set Highest in the city: OAKHILL CORRECTIONAL INST · 1,096 people · 2019 | 1/4 | SYR4 |
| Selenium | 2 µg/L 4% of the EPA limit 50 µg/L Highest in the city: OAKHILL CORRECTIONAL INST · 1,096 people · 2017 | 1/4 | SYR4 |
| Chloroform | 1.46 µg/L No EPA limit set Main supplier: OREGON WATERWORKS · 11,200 people · 2019
Highest in the city: 1.8115 µg/L — OAKHILL CORRECTIONAL INST · 1,096 people · 2019 | 2/4 | SYR4 |
| Dibromochloromethane | 1.8 µg/L No EPA limit set Main supplier: OREGON WATERWORKS · 11,200 people · 2019 | 2/4 | SYR4 |
| Chromium | 1.75 µg/L 1.8% of the EPA limit 100 µg/L Main supplier: OREGON WATERWORKS · 11,200 people · 2017 | 1/4 | SYR4 |
| Combined Radium (-226 And -228) | 1.60385 pCi/L 32% of the EPA limit 5 pCi/L Main supplier: OREGON WATERWORKS · 11,200 people · 2017 | 4/4 | SYR4 |
| Bromodichloromethane | 1.575 µg/L No EPA limit set Main supplier: OREGON WATERWORKS · 11,200 people · 2019 | 2/4 | SYR4 |
| Dichloroacetic Acid | 1.2 µg/L No EPA limit set Highest in the city: OAKHILL CORRECTIONAL INST · 1,096 people · 2019 | 1/4 | SYR4 |
| Bromoform | 0.9960 µg/L No EPA limit set Main supplier: OREGON WATERWORKS · 11,200 people · 2019 | 1/4 | SYR4 |
| Combined Uranium | 0.8458 µg/L 2.8% of the EPA limit 30 µg/L Main supplier: OREGON WATERWORKS · 11,200 people · 2017 | 1/4 | SYR4 |
| Trichloroacetic Acid | 0.6080 µg/L No EPA limit set Highest in the city: OAKHILL CORRECTIONAL INST · 1,096 people · 2019 | 1/4 | SYR4 |
| Xylenes, Total | 0.2800 µg/L 0% of the EPA limit 10000 µg/L Main supplier: OREGON WATERWORKS · 11,200 people · 2019 | 1/4 | SYR4 |
| Tetrachloroethylene | 0.1000 µg/L 2% of the EPA limit 5 µg/L Main supplier: OREGON WATERWORKS · 11,200 people · 2019 | 1/4 | SYR4 |
| Lead | 0.0050 mg/L 33% of the EPA limit 0.0150 mg/L Main supplier: OREGON WATERWORKS · 11,200 people · 2023
Highest in the city: 0.0075 mg/L — COUNTRY VINEYARD 4 · 28 people · 2024 | 4/4 | 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 Oregon
| Supplier | Population served |
|---|---|
| OREGON WATERWORKS | 11,200 |
| OAKHILL CORRECTIONAL INST | 1,096 |
| COUNTRY VIEW MOBILE HOME COMMUNITY LLC | 80 |
| COUNTRY VINEYARD 4 | 28 |
Frequently asked questions about Oregon tap water
Is Oregon tap water safe to drink?
EPA testing detected 24 contaminants in the water serving Oregon. 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 Oregon?
4 public water suppliers report drinking-water monitoring for Oregon, Wisconsin to the EPA. Each is listed above with its population served.
What contaminants are in Oregon's water?
The contaminants EPA monitoring detected in Oregon include Nitrate, Nitrate-Nitrite, Copper, Fluoride, 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.