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Tap water quality report

Hillsboro, OR

EPA monitoring detected 15 contaminants across the 7 water suppliers serving Hillsboro. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

7
water suppliers
95,102
people served
15
contaminants found
Oregon rankings Lead in Oregon PFAS in Oregon

What was found in Hillsboro's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
3660 µg/L 37%
of the EPA limit 10000 µg/L
 4/7 SYR4
Nitrate-Nitrite
2320 µg/L 23%
of the EPA limit 10000 µg/L
 3/7 SYR4
Copper
2190 µg/L 168%
of the EPA limit, in the worst sample — 1300 µg/L
 5/7 SYR4
Fluoride
290 µg/L 7.2%
of the EPA limit 4000 µg/L
 3/7 SYR4
TTHM
64.5 µg/L 81%
of the EPA limit 80 µg/L
 5/7 SYR4
Lead
43 µg/L 287%
of the EPA limit, in the worst sample — 15 µg/L
 4/7 SYR4
Total Haloacetic Acids (HAA5)
43 µg/L 72%
of the EPA limit 60 µg/L
 5/7 SYR4
Barium
34.2 µg/L 1.7%
of the EPA limit 2000 µg/L
 5/7 SYR4
Nitrite
30 µg/L 3%
of the EPA limit 1000 µg/L
 2/7 SYR4
Xylenes, Total
28.3 µg/L 0.3%
of the EPA limit 10000 µg/L
 1/7 SYR4
Ethylbenzene
6 µg/L 0.9%
of the EPA limit 700 µg/L
 1/7 SYR4
Gross Alpha, Excl. Radon And U
4.17 pCi/L 28%
of the EPA limit 15 pCi/L
 1/7 SYR4
Chromium
1 µg/L 1%
of the EPA limit 100 µg/L
 2/7 SYR4
Hexachlorocyclopentadiene
0.1400 µg/L 0.3%
of the EPA limit 50 µg/L
 1/7 SYR4
Lead
0.0064 mg/L 43%
of the EPA limit 0.0150 mg/L
 7/7 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 single worst sample on record — 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 Hillsboro

SupplierPopulation 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 highest level found 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.