What was found in Hillsboro'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 | 3660 µg/L 37% of the EPA limit 10000 µg/L Highest in the city: WOLSBORN FARMS WATER DISTRICT · 92 people · 2019 | 4/7 | SYR4 |
| Nitrate-Nitrite | 2320 µg/L 23% of the EPA limit 10000 µg/L Highest in the city: WOLSBORN FARMS WATER DISTRICT · 92 people · 2019 | 3/7 | SYR4 |
| Copper | 111.5 µg/L 8.6% of the EPA limit 1300 µg/L Main supplier: HILLSBORO, CITY OF · 92,632 people · 2018
Highest in the city: 902.8 µg/L — WOLSBORN FARMS WATER DISTRICT · 92 people · 2017 | 5/7 | SYR4 |
| Fluoride | 290 µg/L 7.2% of the EPA limit 4000 µg/L Highest in the city: RAINBOW ENDS WATER SYSTEM · 50 people · 2019 | 3/7 | SYR4 |
| TTHM | 51.09 µg/L 64% of the EPA limit 80 µg/L Main supplier: HILLSBORO, CITY OF · 92,632 people · 2019 | 5/7 | SYR4 |
| Total Haloacetic Acids (HAA5) | 36.245 µg/L 60% of the EPA limit 60 µg/L Main supplier: HILLSBORO, CITY OF · 92,632 people · 2019 | 5/7 | SYR4 |
| Barium | 34.2 µg/L 1.7% of the EPA limit 2000 µg/L Highest in the city: RAINBOW ENDS WATER SYSTEM · 50 people · 2019 | 5/7 | SYR4 |
| Nitrite | 28 µg/L 2.8% of the EPA limit 1000 µg/L Highest in the city: JOINT WATER COMMISSION · 0 people · 2019 | 2/7 | SYR4 |
| Xylenes, Total | 21.1 µg/L 0.2% of the EPA limit 10000 µg/L Highest in the city: WOLSBORN FARMS WATER DISTRICT · 92 people · 2019 | 1/7 | SYR4 |
| Lead | 5 µg/L 33% of the EPA limit 15 µg/L Main supplier: HILLSBORO, CITY OF · 92,632 people · 2018
Highest in the city: 11.3 µg/L — HILLSBORO-CHERRY GROVE · 1,628 people · 2019 | 4/7 | SYR4 |
| Ethylbenzene | 4.68 µg/L 0.7% of the EPA limit 700 µg/L Highest in the city: WOLSBORN FARMS WATER DISTRICT · 92 people · 2019 | 1/7 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.17 pCi/L 28% of the EPA limit 15 pCi/L Highest in the city: RAINBOW ENDS WATER SYSTEM · 50 people · 2019 | 1/7 | SYR4 |
| Chromium | 1 µg/L 1% of the EPA limit 100 µg/L Highest in the city: JOINT WATER COMMISSION · 0 people · 2019 | 2/7 | SYR4 |
| Hexachlorocyclopentadiene | 0.1400 µg/L 0.3% of the EPA limit 50 µg/L Highest in the city: JOINT WATER COMMISSION · 0 people · 2019 | 1/7 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: HILLSBORO, CITY OF · 92,632 people · 2024
Highest in the city: 0.0064 mg/L — HILLSBORO-CHERRY GROVE · 1,628 people · 2024 | 7/7 | LCR |
Water suppliers serving Hillsboro
| Supplier | Population served |
|---|---|
| HILLSBORO, CITY OF | 92,632 |
| HILLSBORO-CHERRY GROVE | 1,628 |
| FIR GROVE HOMEOWNERS ASSN | 450 |
| SOUTH HILLS WATER SYSTEM | 250 |
| WOLSBORN FARMS WATER DISTRICT | 92 |
| RAINBOW ENDS WATER SYSTEM | 50 |
| JOINT WATER COMMISSION | 0 |
Frequently asked questions about Hillsboro tap water
Is Hillsboro tap water safe to drink?
EPA testing detected 15 contaminants in the water serving Hillsboro. 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 Hillsboro?
7 public water suppliers report drinking-water monitoring for Hillsboro, Oregon to the EPA. Each is listed above with its population served.
What contaminants are in Hillsboro's water?
The contaminants EPA monitoring detected in Hillsboro include Nitrate, Nitrate-Nitrite, Copper, Fluoride, 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.