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Tap water quality report

Yelm, WA

EPA monitoring detected 10 contaminants across the 3 water suppliers serving Yelm. 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.

3
water suppliers
20,353
people served
10
contaminants found
Washington rankings Lead in Washington PFAS in Washington

What was found in Yelm'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
4975 µg/L 50%
of the EPA limit 10000 µg/L
Main supplier: YELM CITY OF · 17,355 people · 2019
3/3 SYR4
Nitrate-Nitrite
1190 µg/L 12%
of the EPA limit 10000 µg/L
Main supplier: YELM CITY OF · 17,355 people · 2019
Highest in the city: 2300 µg/L — RICHMOND TOTTEN · 42 people · 2016
3/3 SYR4
TTHM
28.66 µg/L 36%
of the EPA limit 80 µg/L
Main supplier: YELM CITY OF · 17,355 people · 2019
1/3 SYR4
Chloroform
21.26 µg/L
No EPA limit set
Main supplier: YELM CITY OF · 17,355 people · 2019
1/3 SYR4
Total Haloacetic Acids (HAA5)
12.14 µg/L 20%
of the EPA limit 60 µg/L
Main supplier: YELM CITY OF · 17,355 people · 2019
1/3 SYR4
Bromodichloromethane
6.635 µg/L
No EPA limit set
Main supplier: YELM CITY OF · 17,355 people · 2019
1/3 SYR4
Dichloroacetic Acid
6.61 µg/L
No EPA limit set
Main supplier: YELM CITY OF · 17,355 people · 2019
1/3 SYR4
Trichloroacetic Acid
6.295 µg/L
No EPA limit set
Main supplier: YELM CITY OF · 17,355 people · 2019
1/3 SYR4
Dibromochloromethane
1.69 µg/L
No EPA limit set
Main supplier: YELM CITY OF · 17,355 people · 2019
1/3 SYR4
Lead
0.0019 mg/L 13%
of the EPA limit 0.0150 mg/L
Main supplier: YELM CITY OF · 17,355 people · 2024
Highest in the city: 0.0628 mg/L — RICHMOND TOTTEN · 42 people · 2019
3/3 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 Yelm

SupplierPopulation served
YELM CITY OF 17,355
CLEARWOOD 2,956
RICHMOND TOTTEN 42

Frequently asked questions about Yelm tap water

Is Yelm tap water safe to drink?

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

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

What contaminants are in Yelm's water?

The contaminants EPA monitoring detected in Yelm include Nitrate, Nitrate-Nitrite, TTHM, Chloroform, 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.