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Tap water quality report

Renton, WA

EPA monitoring detected 17 contaminants across the 6 water suppliers serving Renton. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

6
water suppliers
203,262
people served
17
contaminants found
Washington rankings Lead in Washington PFAS in Washington

What was found in Renton'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
3200 µg/L 32%
of the EPA limit 10000 µg/L
 2/6 SYR4
Nitrate-Nitrite
3200 µg/L 32%
of the EPA limit 10000 µg/L
 2/6 SYR4
Fluoride
910 µg/L 23%
of the EPA limit 4000 µg/L
 2/6 SYR4
Total Haloacetic Acids (HAA5)
66.3 µg/L 111%
of the EPA limit, in the worst sample — 60 µg/L
 6/6 SYR4
TTHM
58.09 µg/L 73%
of the EPA limit 80 µg/L
 6/6 SYR4
Chloroform
55.6 µg/L
No EPA limit set
 6/6 SYR4
Trichloroacetic Acid
39.2 µg/L
No EPA limit set
 6/6 SYR4
Copper
33 µg/L 2.5%
of the EPA limit 1300 µg/L
 2/6 SYR4
Dichloroacetic Acid
28.9 µg/L
No EPA limit set
 4/6 SYR4
Bromodichloromethane
6.7 µg/L
No EPA limit set
 5/6 SYR4
Monochloroacetic Acid
5.2 µg/L
No EPA limit set
 2/6 SYR4
Arsenic
3.5 µg/L 35%
of the EPA limit 10 µg/L
 2/6 SYR4
Dibromochloromethane
3.2 µg/L
No EPA limit set
 4/6 SYR4
Dibromoacetic Acid
1.05 µg/L
No EPA limit set
 4/6 SYR4
Bromoform
0.9000 µg/L
No EPA limit set
 2/6 SYR4
Lead
0.0035 mg/L 23%
of the EPA limit 0.0150 mg/L
 5/6 LCR
PFBS
0.0030 µg/L
No EPA limit set
 1/6 UCMR-5
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 Renton

SupplierPopulation served
RENTON CITY OF 108,091
SOOS CREEK WATER & SEWER DISTRICT 74,172
KING COUNTY WATER DISTRICT NO 90 20,100
MAPLEWOOD ADDITION WATER COOP 435
RAVENSDALE WATER SUPPLY 389
LAKE WILDERNESS SHORE ACRES ESTATE 75

Frequently asked questions about Renton tap water

Is Renton tap water safe to drink?

EPA testing detected 17 contaminants in the water serving Renton. 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 Renton?

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

What contaminants are in Renton's water?

The contaminants EPA monitoring detected in Renton include Nitrate, Nitrate-Nitrite, Fluoride, Total Haloacetic Acids (HAA5), 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.