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Tap water quality report

Washington, MO

EPA monitoring detected 16 contaminants across the 4 water suppliers serving Washington. 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.

4
water suppliers
17,660
people served
16
contaminants found
Missouri rankings Lead in Missouri PFAS in Missouri

What was found in Washington'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
Barium
433.4 µg/L 22%
of the EPA limit 2000 µg/L
Main supplier: WASHINGTON PWS · 14,068 people · 2017
Highest in the city: 624.65 µg/L — FRANKLIN COUNTY PWSD 1 · 3,500 people · 2017
4/4 SYR4
Nitrate-Nitrite
170 µg/L 1.7%
of the EPA limit 10000 µg/L
Main supplier: WASHINGTON PWS · 14,068 people · 2019
Highest in the city: 490 µg/L — FRANKLIN COUNTY PWSD 1 · 3,500 people · 2019
4/4 SYR4
Copper
131 µg/L 10%
of the EPA limit 1300 µg/L
Main supplier: WASHINGTON PWS · 14,068 people · 2018
Highest in the city: 175.8 µg/L — FRANKLIN COUNTY PWSD 1 CARDINAL MEADOWS · 52 people · 2018
4/4 SYR4
Fluoride
148 µg/L 3.7%
of the EPA limit 4000 µg/L
Main supplier: WASHINGTON PWS · 14,068 people · 2017
3/4 SYR4
Toluene
17.2 µg/L 1.7%
of the EPA limit 1000 µg/L
Main supplier: WASHINGTON PWS · 14,068 people · 2019
1/4 SYR4
Total Haloacetic Acids (HAA5)
9.08 µg/L 15%
of the EPA limit 60 µg/L
Highest in the city: FRANKLIN COUNTY PWSD 1 · 3,500 people · 2019
1/4 SYR4
Dichloroacetic Acid
6.88 µg/L
No EPA limit set
Highest in the city: FRANKLIN COUNTY PWSD 1 · 3,500 people · 2019
1/4 SYR4
Lead
5.5175 µg/L 37%
of the EPA limit 15 µg/L
Main supplier: WASHINGTON PWS · 14,068 people · 2018
Highest in the city: 6.438 µg/L — AVERY MOBILE HOME COURT · 40 people · 2019
4/4 SYR4
Chromium
2.0855 µg/L 2.1%
of the EPA limit 100 µg/L
Main supplier: WASHINGTON PWS · 14,068 people · 2017
Highest in the city: 4.912 µg/L — FRANKLIN COUNTY PWSD 1 · 3,500 people · 2017
4/4 SYR4
Trichloroacetic Acid
2.2 µg/L
No EPA limit set
Highest in the city: FRANKLIN COUNTY PWSD 1 · 3,500 people · 2019
1/4 SYR4
TTHM
1.73 µg/L 2.2%
of the EPA limit 80 µg/L
Highest in the city: FRANKLIN COUNTY PWSD 1 · 3,500 people · 2019
1/4 SYR4
Chloroform
1.56 µg/L
No EPA limit set
Main supplier: WASHINGTON PWS · 14,068 people · 2019
2/4 SYR4
Combined Radium (-226 And -228)
1.3 pCi/L 26%
of the EPA limit 5 pCi/L
Highest in the city: AVERY MOBILE HOME COURT · 40 people · 2016
2/4 SYR4
Xylenes, Total
1.02 µg/L 0%
of the EPA limit 10000 µg/L
Highest in the city: FRANKLIN COUNTY PWSD 1 · 3,500 people · 2017
1/4 SYR4
Bromodichloromethane
0.9300 µg/L
No EPA limit set
Highest in the city: FRANKLIN COUNTY PWSD 1 · 3,500 people · 2019
1/4 SYR4
Lead
0.0026 mg/L 17%
of the EPA limit 0.0150 mg/L
Main supplier: WASHINGTON PWS · 14,068 people · 2024
Highest in the city: 0.0041 mg/L — FRANKLIN COUNTY PWSD 1 · 3,500 people · 2025
4/4 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 Washington

SupplierPopulation served
WASHINGTON PWS 14,068
FRANKLIN COUNTY PWSD 1 3,500
FRANKLIN COUNTY PWSD 1 CARDINAL MEADOWS 52
AVERY MOBILE HOME COURT 40

Frequently asked questions about Washington tap water

Is Washington tap water safe to drink?

EPA testing detected 16 contaminants in the water serving Washington. 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 Washington?

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

What contaminants are in Washington's water?

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