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Tap water quality report

The Dalles, OR

EPA monitoring detected 17 contaminants across the 7 water suppliers serving The Dalles. 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.

7
water suppliers
18,390
people served
17
contaminants found
Oregon rankings Lead in Oregon PFAS in Oregon

What was found in The Dalles'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
160 µg/L 1.6%
of the EPA limit 10000 µg/L
Main supplier: THE DALLES, CITY OF · 13,010 people · 2019
Highest in the city: 12040 µg/L — PINEWOOD MOBILE MANOR · 130 people · 2019
6/7 SYR4
Nitrate-Nitrite
160 µg/L 1.6%
of the EPA limit 10000 µg/L
Main supplier: THE DALLES, CITY OF · 13,010 people · 2019
Highest in the city: 7130 µg/L — PINEWOOD MOBILE MANOR · 130 people · 2018
5/7 SYR4
Fluoride
800 µg/L 20%
of the EPA limit 4000 µg/L
Main supplier: THE DALLES, CITY OF · 13,010 people · 2019
Highest in the city: 1211 µg/L — CHENOWITH PUD · 4,500 people · 2012
7/7 SYR4
Copper
120 µg/L 9.2%
of the EPA limit 1300 µg/L
Main supplier: THE DALLES, CITY OF · 13,010 people · 2018
Highest in the city: 202 µg/L — CHENOWITH PUD · 4,500 people · 2019
7/7 SYR4
Lithium
42.1 µg/L
No EPA limit set
Main supplier: THE DALLES, CITY OF · 13,010 people · 2024
Highest in the city: 47 µg/L — CHENOWITH PUD · 4,500 people · 2024
2/7 UCMR-5
Total Haloacetic Acids (HAA5)
28.015 µg/L 47%
of the EPA limit 60 µg/L
Main supplier: THE DALLES, CITY OF · 13,010 people · 2019
Highest in the city: 45.725 µg/L — PINEWOOD MOBILE MANOR · 130 people · 2018
3/7 SYR4
Barium
40.35 µg/L 2%
of the EPA limit 2000 µg/L
Main supplier: THE DALLES, CITY OF · 13,010 people · 2019
6/7 SYR4
TTHM
30 µg/L 38%
of the EPA limit 80 µg/L
Main supplier: THE DALLES, CITY OF · 13,010 people · 2019
4/7 SYR4
Lead
5.28 µg/L 35%
of the EPA limit 15 µg/L
Main supplier: THE DALLES, CITY OF · 13,010 people · 2019
Highest in the city: 17.317 µg/L — VIEW POINT TRAILER COURT · 160 people · 2019
7/7 SYR4
Gross Beta Particle Activity
4.2 pCi/L
No EPA limit set
Highest in the city: PINEWOOD MOBILE MANOR · 130 people · 2013
1/7 SYR4
Toluene
3.6 µg/L 0.4%
of the EPA limit 1000 µg/L
Highest in the city: PINEWOOD MOBILE MANOR · 130 people · 2018
1/7 SYR4
Chromium
1.85 µg/L 1.9%
of the EPA limit 100 µg/L
Highest in the city: HAZEL DELL ORCHARD · 260 people · 2018
2/7 SYR4
Combined Uranium
1.8 µg/L 6%
of the EPA limit 30 µg/L
Highest in the city: HAZEL DELL ORCHARD · 260 people · 2017
2/7 SYR4
Combined Radium (-226 And -228)
1.2 pCi/L 24%
of the EPA limit 5 pCi/L
Highest in the city: CHENOWITH PUD · 4,500 people · 2012
1/7 SYR4
Arsenic
1.1 µg/L 11%
of the EPA limit 10 µg/L
Highest in the city: PINEWOOD MOBILE MANOR · 130 people · 2018
1/7 SYR4
Picloram
0.1000 µg/L 0%
of the EPA limit 500 µg/L
Main supplier: THE DALLES, CITY OF · 13,010 people · 2018
1/7 SYR4
Lead
0.00021 mg/L 1.4%
of the EPA limit 0.0150 mg/L
Main supplier: THE DALLES, CITY OF · 13,010 people · 2026
Highest in the city: 0.0033 mg/L — FOLEY LAKES MOBILE HOME PARK · 300 people · 2023
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 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 The Dalles

SupplierPopulation served
THE DALLES, CITY OF 13,010
CHENOWITH PUD 4,500
FOLEY LAKES MOBILE HOME PARK 300
HAZEL DELL ORCHARD 260
VIEW POINT TRAILER COURT 160
PINEWOOD MOBILE MANOR 130
ROWENA DELL WATER SYSTEM 30

Frequently asked questions about The Dalles tap water

Is The Dalles tap water safe to drink?

EPA testing detected 17 contaminants in the water serving The Dalles. 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 The Dalles?

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

What contaminants are in The Dalles's water?

The contaminants EPA monitoring detected in The Dalles include Nitrate, Nitrate-Nitrite, Fluoride, Copper, Lithium. 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.