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Tap water quality report

Cornelius, OR

EPA monitoring detected 13 contaminants across the 3 water suppliers serving Cornelius. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

3
water suppliers
14,605
people served
13
contaminants found
Oregon rankings Lead in Oregon PFAS in Oregon

What was found in Cornelius'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
2200 µg/L 22%
of the EPA limit 10000 µg/L
 2/3 SYR4
Nitrate-Nitrite
700 µg/L 7%
of the EPA limit 10000 µg/L
 1/3 SYR4
Copper
213 µg/L 16%
of the EPA limit 1300 µg/L
 3/3 SYR4
Fluoride
120 µg/L 3%
of the EPA limit 4000 µg/L
 1/3 SYR4
TTHM
73.5 µg/L 92%
of the EPA limit 80 µg/L
 2/3 SYR4
Total Haloacetic Acids (HAA5)
50.6 µg/L 84%
of the EPA limit 60 µg/L
 3/3 SYR4
Barium
18.5 µg/L 0.9%
of the EPA limit 2000 µg/L
 2/3 SYR4
Lead
14 µg/L 93%
of the EPA limit 15 µg/L
 3/3 SYR4
Gross Alpha, Excl. Radon And U
4.21 pCi/L 28%
of the EPA limit 15 pCi/L
 1/3 SYR4
Toluene
1.9 µg/L 0.2%
of the EPA limit 1000 µg/L
 1/3 SYR4
Thallium, Total
1 µg/L 50%
of the EPA limit 2 µg/L
 1/3 SYR4
Beryllium, Total
0.9000 µg/L 23%
of the EPA limit 4 µg/L
 1/3 SYR4
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
 3/3 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 Cornelius

SupplierPopulation served
CORNELIUS, CITY OF 14,490
WEST LAUREL ACRES WATER CO 65
LAUREL ACRES WATER CO INC 50

Frequently asked questions about Cornelius tap water

Is Cornelius tap water safe to drink?

EPA testing detected 13 contaminants in the water serving Cornelius. 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 Cornelius?

3 public water suppliers report drinking-water monitoring for Cornelius, Oregon to the EPA. Each is listed above with its population served.

What contaminants are in Cornelius's water?

The contaminants EPA monitoring detected in Cornelius 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.