What was found in St Helens'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 | 2800 µg/L 28% of the EPA limit 10000 µg/L Main supplier: ST HELENS, CITY OF · 13,410 people · 2019
Highest in the city: 5672 µg/L — DEER ISLAND WATERWORKS · 90 people · 2019 | 5/5 | SYR4 |
| Nitrate-Nitrite | 1580 µg/L 16% of the EPA limit 10000 µg/L Main supplier: ST HELENS, CITY OF · 13,410 people · 2012
Highest in the city: 3250 µg/L — DEER ISLAND WATERWORKS · 90 people · 2019 | 4/5 | SYR4 |
| Copper | 449.5 µg/L 35% of the EPA limit 1300 µg/L Main supplier: ST HELENS, CITY OF · 13,410 people · 2019
Highest in the city: 775.7 µg/L — MCNULTY WATER PUD · 2,500 people · 2018 | 5/5 | SYR4 |
| Fluoride | 394 µg/L 9.9% of the EPA limit 4000 µg/L Highest in the city: MCNULTY WATER PUD · 2,500 people · 2019 | 4/5 | SYR4 |
| Nitrite | 76.1 µg/L 7.6% of the EPA limit 1000 µg/L Highest in the city: WARREN WATER ASSOCIATION · 2,050 people · 2017 | 3/5 | SYR4 |
| Barium | 50 µg/L 2.5% of the EPA limit 2000 µg/L Highest in the city: DEER ISLAND HEIGHTS WS · 60 people · 2012 | 4/5 | SYR4 |
| TTHM | 24.33 µg/L 30% of the EPA limit 80 µg/L Main supplier: ST HELENS, CITY OF · 13,410 people · 2019 | 1/5 | SYR4 |
| Arsenic | 18.95 µg/L 190% of the EPA limit, at the 95th percentile of samples — 10 µg/L Highest in the city: MCNULTY WATER PUD · 2,500 people · 2019 | 1/5 | SYR4 |
| Lead | 4 µg/L 27% of the EPA limit 15 µg/L Main supplier: ST HELENS, CITY OF · 13,410 people · 2019
Highest in the city: 8 µg/L — DEER ISLAND HEIGHTS WS · 60 people · 2017 | 4/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 7.58 µg/L 13% of the EPA limit 60 µg/L Main supplier: ST HELENS, CITY OF · 13,410 people · 2019 | 1/5 | SYR4 |
| Combined Radium (-226 And -228) | 2.766 pCi/L 55% of the EPA limit 5 pCi/L Highest in the city: MCNULTY WATER PUD · 2,500 people · 2013 | 1/5 | SYR4 |
| Gross Alpha, Excl. Radon And U | 2.4 pCi/L 16% of the EPA limit 15 pCi/L Highest in the city: MCNULTY WATER PUD · 2,500 people · 2013 | 1/5 | SYR4 |
| Lead | 0.0010 mg/L 6.9% of the EPA limit 0.0150 mg/L Main supplier: ST HELENS, CITY OF · 13,410 people · 2025
Highest in the city: 0.1660 mg/L — DEER ISLAND HEIGHTS WS · 60 people · 2026 | 5/5 | LCR |
| PFBS | 0.0155 µg/L No EPA limit set Main supplier: ST HELENS, CITY OF · 13,410 people · 2025 | 1/5 | UCMR-5 |
Water suppliers serving St Helens
| Supplier | Population served |
|---|---|
| ST HELENS, CITY OF | 13,410 |
| MCNULTY WATER PUD | 2,500 |
| WARREN WATER ASSOCIATION | 2,050 |
| DEER ISLAND WATERWORKS | 90 |
| DEER ISLAND HEIGHTS WS | 60 |
Frequently asked questions about St Helens tap water
Is St Helens tap water safe to drink?
EPA testing detected 14 contaminants in the water serving St Helens. 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 St Helens?
5 public water suppliers report drinking-water monitoring for St Helens, Oregon to the EPA. Each is listed above with its population served.
What contaminants are in St Helens's water?
The contaminants EPA monitoring detected in St Helens include Nitrate, Nitrate-Nitrite, Copper, Fluoride, Nitrite. 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.