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Tap water quality report

Waterville, WA

EPA monitoring detected 19 contaminants across the 2 water suppliers serving Waterville. 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
1,520
people served
19
contaminants found
Washington rankings Lead in Washington PFAS in Washington

What was found in Waterville'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-Nitrite
34480 µg/L 345%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2019
2/2 SYR4
Nitrate
34460 µg/L 345%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2019
2/2 SYR4
Fluoride
429.5 µg/L 11%
of the EPA limit 4000 µg/L
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2017
Highest in the city: 490 µg/L — MANSFIELD WATER SYSTEM · 380 people · 2019
2/2 SYR4
Copper
29.941 µg/L 2.3%
of the EPA limit 1300 µg/L
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2017
Highest in the city: 43.7275 µg/L — MANSFIELD WATER SYSTEM · 380 people · 2019
2/2 SYR4
Barium
20.222 µg/L 1%
of the EPA limit 2000 µg/L
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2017
2/2 SYR4
TTHM
5.555 µg/L 6.9%
of the EPA limit 80 µg/L
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2019
Highest in the city: 9.104 µg/L — MANSFIELD WATER SYSTEM · 380 people · 2019
2/2 SYR4
Bromoform
4.407 µg/L
No EPA limit set
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2019
Highest in the city: 4.608 µg/L — MANSFIELD WATER SYSTEM · 380 people · 2019
2/2 SYR4
Lead
4.38 µg/L 29%
of the EPA limit 15 µg/L
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2017
1/2 SYR4
Selenium
4.368 µg/L 8.7%
of the EPA limit 50 µg/L
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2017
2/2 SYR4
Dibromochloromethane
1.365 µg/L
No EPA limit set
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2019
Highest in the city: 3.312 µg/L — MANSFIELD WATER SYSTEM · 380 people · 2019
2/2 SYR4
Chromium
0.9420 µg/L 0.9%
of the EPA limit 100 µg/L
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2017
Highest in the city: 2.855 µg/L — MANSFIELD WATER SYSTEM · 380 people · 2019
2/2 SYR4
Dibromoacetic Acid
1.3 µg/L
No EPA limit set
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2019
Highest in the city: 1.495 µg/L — MANSFIELD WATER SYSTEM · 380 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
1.3 µg/L 2.2%
of the EPA limit 60 µg/L
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2018
Highest in the city: 1.495 µg/L — MANSFIELD WATER SYSTEM · 380 people · 2016
2/2 SYR4
Arsenic
1.423 µg/L 14%
of the EPA limit 10 µg/L
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2017
2/2 SYR4
Bromodichloromethane
0.6000 µg/L
No EPA limit set
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2019
Highest in the city: 1.3035 µg/L — MANSFIELD WATER SYSTEM · 380 people · 2019
2/2 SYR4
Picloram
1.17 µg/L 0.2%
of the EPA limit 500 µg/L
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2018
1/2 SYR4
Thallium, Total
1.163 µg/L 58%
of the EPA limit 2 µg/L
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2017
2/2 SYR4
Chloroform
0.6000 µg/L
No EPA limit set
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2019
1/2 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: WATERVILLE TOWN OF · 1,140 people · 2025
2/2 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 Waterville

SupplierPopulation served
WATERVILLE TOWN OF 1,140
MANSFIELD WATER SYSTEM 380

Frequently asked questions about Waterville tap water

Is Waterville tap water safe to drink?

EPA testing detected 19 contaminants in the water serving Waterville. 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 Waterville?

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

What contaminants are in Waterville's water?

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