Tap WaterIndex

← Oregon

Tap water quality report

Jefferson, OR

EPA monitoring detected 10 contaminants across the 2 water suppliers serving Jefferson. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

2
water suppliers
3,413
people served
10
contaminants found
Oregon rankings Lead in Oregon PFAS in Oregon

What was found in Jefferson'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.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
414 µg/L 4.1%
of the EPA limit 10000 µg/L
Main supplier: JEFFERSON, CITY OF · 3,348 people · 2019
Highest in the city: 1300 µg/L — JEFFERSON MOBILE ACRES · 65 people · 2019
2/2 SYR4
Nitrate-Nitrite
1040 µg/L 10%
of the EPA limit 10000 µg/L
Highest in the city: JEFFERSON MOBILE ACRES · 65 people · 2019
1/2 SYR4
Copper
718.35 µg/L 55%
of the EPA limit 1300 µg/L
Main supplier: JEFFERSON, CITY OF · 3,348 people · 2018
1/2 SYR4
TTHM
18.7 µg/L 23%
of the EPA limit 80 µg/L
Main supplier: JEFFERSON, CITY OF · 3,348 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
18.5 µg/L 31%
of the EPA limit 60 µg/L
Main supplier: JEFFERSON, CITY OF · 3,348 people · 2019
1/2 SYR4
Lead
4.725 µg/L 32%
of the EPA limit 15 µg/L
Main supplier: JEFFERSON, CITY OF · 3,348 people · 2018
1/2 SYR4
Gross Alpha, Excl. Radon And U
3.2 pCi/L 21%
of the EPA limit 15 pCi/L
Highest in the city: JEFFERSON MOBILE ACRES · 65 people · 2016
1/2 SYR4
Arsenic
2 µg/L 20%
of the EPA limit 10 µg/L
Highest in the city: JEFFERSON MOBILE ACRES · 65 people · 2019
1/2 SYR4
Combined Radium (-226 And -228)
1.1 pCi/L 22%
of the EPA limit 5 pCi/L
Highest in the city: JEFFERSON MOBILE ACRES · 65 people · 2016
1/2 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: JEFFERSON, CITY OF · 3,348 people · 2025
Highest in the city: 0.0081 mg/L — JEFFERSON MOBILE ACRES · 65 people · 2024
2/2 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 Jefferson

SupplierPopulation served
JEFFERSON, CITY OF 3,348
JEFFERSON MOBILE ACRES 65

Frequently asked questions about Jefferson tap water

Is Jefferson tap water safe to drink?

EPA testing detected 10 contaminants in the water serving Jefferson. 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 Jefferson?

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

What contaminants are in Jefferson's water?

The contaminants EPA monitoring detected in Jefferson include Nitrate, Nitrate-Nitrite, Copper, TTHM, Total Haloacetic Acids (HAA5). 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.