Tap WaterIndex

← Washington

Tap water quality report

Deer Park, WA

EPA monitoring detected 19 contaminants across the 1 water supplier serving Deer Park. 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.

1
water supplier
5,435
people served
19
contaminants found
Washington rankings Lead in Washington PFAS in Washington

What was found in Deer Park'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
4589 µg/L 46%
of the EPA limit 10000 µg/L
Main supplier: DEER PARK CITY OF · 5,435 people · 2019
1/1 SYR4
Nitrate-Nitrite
4494.5 µg/L 45%
of the EPA limit 10000 µg/L
Main supplier: DEER PARK CITY OF · 5,435 people · 2019
1/1 SYR4
Fluoride
139.35 µg/L 3.5%
of the EPA limit 4000 µg/L
Main supplier: DEER PARK CITY OF · 5,435 people · 2019
1/1 SYR4
Barium
76.73 µg/L 3.8%
of the EPA limit 2000 µg/L
Main supplier: DEER PARK CITY OF · 5,435 people · 2019
1/1 SYR4
Copper
18.4075 µg/L 1.4%
of the EPA limit 1300 µg/L
Main supplier: DEER PARK CITY OF · 5,435 people · 2019
1/1 SYR4
Arsenic
5.9285 µg/L 59%
of the EPA limit 10 µg/L
Main supplier: DEER PARK CITY OF · 5,435 people · 2019
1/1 SYR4
TTHM
5.608 µg/L 7%
of the EPA limit 80 µg/L
Main supplier: DEER PARK CITY OF · 5,435 people · 2019
1/1 SYR4
Lead
3.049 µg/L 20%
of the EPA limit 15 µg/L
Main supplier: DEER PARK CITY OF · 5,435 people · 2019
1/1 SYR4
Chloroform
2.73 µg/L
No EPA limit set
Main supplier: DEER PARK CITY OF · 5,435 people · 2019
1/1 SYR4
Dibromochloromethane
1.43 µg/L
No EPA limit set
Main supplier: DEER PARK CITY OF · 5,435 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
1.23 µg/L 2.1%
of the EPA limit 60 µg/L
Main supplier: DEER PARK CITY OF · 5,435 people · 2019
1/1 SYR4
Trichloroacetic Acid
1.23 µg/L
No EPA limit set
Main supplier: DEER PARK CITY OF · 5,435 people · 2019
1/1 SYR4
Bromodichloromethane
1.026 µg/L
No EPA limit set
Main supplier: DEER PARK CITY OF · 5,435 people · 2019
1/1 SYR4
Bromoform
0.8950 µg/L
No EPA limit set
Main supplier: DEER PARK CITY OF · 5,435 people · 2019
1/1 SYR4
Picloram
0.1160 µg/L 0%
of the EPA limit 500 µg/L
Main supplier: DEER PARK CITY OF · 5,435 people · 2019
1/1 SYR4
PFOS
0.0075 µg/L
No EPA limit set
Main supplier: DEER PARK CITY OF · 5,435 people · 2024
1/1 UCMR-5
PFNA
0.0043 µg/L
No EPA limit set
Main supplier: DEER PARK CITY OF · 5,435 people · 2024
1/1 UCMR-5
PFBS
0.0031 µg/L
No EPA limit set
Main supplier: DEER PARK CITY OF · 5,435 people · 2024
1/1 UCMR-5
Lead
0.0016 mg/L 11%
of the EPA limit 0.0150 mg/L
Main supplier: DEER PARK CITY OF · 5,435 people · 2025
1/1 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 Deer Park

SupplierPopulation served
DEER PARK CITY OF 5,435

Frequently asked questions about Deer Park tap water

Is Deer Park tap water safe to drink?

EPA testing detected 19 contaminants in the water serving Deer Park. 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 Deer Park?

1 public water supplier report drinking-water monitoring for Deer Park, Washington to the EPA. Each is listed above with its population served.

What contaminants are in Deer Park's water?

The contaminants EPA monitoring detected in Deer Park include Nitrate, Nitrate-Nitrite, Fluoride, Barium, Copper. 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.