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Tap water quality report

Duvall, WA

EPA monitoring detected 8 contaminants across the 2 water suppliers serving Duvall. 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
14,850
people served
8
contaminants found
Washington rankings Lead in Washington PFAS in Washington

What was found in Duvall'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
TTHM
47.675 µg/L 60%
of the EPA limit 80 µg/L
Main supplier: DUVALL CITY OF · 11,050 people · 2019
Highest in the city: 50.876 µg/L — KING COUNTY WATER DISTRICT 119 · 3,800 people · 2019
2/2 SYR4
Chloroform
44.15 µg/L
No EPA limit set
Main supplier: DUVALL CITY OF · 11,050 people · 2019
Highest in the city: 48.39 µg/L — KING COUNTY WATER DISTRICT 119 · 3,800 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
41.14 µg/L 69%
of the EPA limit 60 µg/L
Main supplier: DUVALL CITY OF · 11,050 people · 2019
2/2 SYR4
Trichloroacetic Acid
25.1 µg/L
No EPA limit set
Main supplier: DUVALL CITY OF · 11,050 people · 2019
2/2 SYR4
Dichloroacetic Acid
16.45 µg/L
No EPA limit set
Main supplier: DUVALL CITY OF · 11,050 people · 2019
Highest in the city: 18.55 µg/L — KING COUNTY WATER DISTRICT 119 · 3,800 people · 2019
2/2 SYR4
Monochloroacetic Acid
3.34 µg/L
No EPA limit set
Main supplier: DUVALL CITY OF · 11,050 people · 2019
Highest in the city: 4.448 µg/L — KING COUNTY WATER DISTRICT 119 · 3,800 people · 2019
2/2 SYR4
Bromodichloromethane
3.5375 µg/L
No EPA limit set
Main supplier: DUVALL CITY OF · 11,050 people · 2019
2/2 SYR4
Dibromochloromethane
1.826 µg/L
No EPA limit set
Main supplier: DUVALL CITY OF · 11,050 people · 2019
2/2 SYR4
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 Duvall

SupplierPopulation served
DUVALL CITY OF 11,050
KING COUNTY WATER DISTRICT 119 3,800

Frequently asked questions about Duvall tap water

Is Duvall tap water safe to drink?

EPA testing detected 8 contaminants in the water serving Duvall. 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 Duvall?

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

What contaminants are in Duvall's water?

The contaminants EPA monitoring detected in Duvall include TTHM, Chloroform, Total Haloacetic Acids (HAA5), Trichloroacetic Acid, Dichloroacetic Acid. 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.