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Tap water quality report

Dewey, OK

EPA monitoring detected 15 contaminants across the 3 water suppliers serving Dewey. 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
3,878
people served
15
contaminants found
Oklahoma rankings Lead in Oklahoma PFAS in Oklahoma

What was found in Dewey'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
Copper
195 µg/L 15%
of the EPA limit 1300 µg/L
Main supplier: DEWEY PUBLIC WORKS AUTHORITY · 3,490 people · 2017
Highest in the city: 2814 µg/L — WASHINGTON CO RWD #7 · 258 people · 2019
3/3 SYR4
TTHM
73.725 µg/L 92%
of the EPA limit 80 µg/L
Main supplier: DEWEY PUBLIC WORKS AUTHORITY · 3,490 people · 2019
Highest in the city: 99.88 µg/L — WASHINGTON CO RWD #7 · 258 people · 2019
3/3 SYR4
Chloroform
46.36 µg/L
No EPA limit set
Main supplier: DEWEY PUBLIC WORKS AUTHORITY · 3,490 people · 2019
Highest in the city: 58.205 µg/L — WASHINGTON CO RWD #7 · 258 people · 2019
3/3 SYR4
Total Haloacetic Acids (HAA5)
49.56 µg/L 83%
of the EPA limit 60 µg/L
Main supplier: DEWEY PUBLIC WORKS AUTHORITY · 3,490 people · 2019
3/3 SYR4
Bromodichloromethane
22.06 µg/L
No EPA limit set
Main supplier: DEWEY PUBLIC WORKS AUTHORITY · 3,490 people · 2019
Highest in the city: 31.37 µg/L — WASHINGTON CO RWD #7 · 258 people · 2019
3/3 SYR4
Dibromochloromethane
13.68 µg/L
No EPA limit set
Main supplier: DEWEY PUBLIC WORKS AUTHORITY · 3,490 people · 2019
Highest in the city: 25.66 µg/L — WASHINGTON CO RWD #7 · 258 people · 2019
3/3 SYR4
Dichloroacetic Acid
23.56 µg/L
No EPA limit set
Main supplier: DEWEY PUBLIC WORKS AUTHORITY · 3,490 people · 2019
3/3 SYR4
Trichloroacetic Acid
11.305 µg/L
No EPA limit set
Main supplier: DEWEY PUBLIC WORKS AUTHORITY · 3,490 people · 2019
Highest in the city: 20.4 µg/L — WASHINGTON CO RWD #7 · 258 people · 2019
3/3 SYR4
Lead
10.1 µg/L 67%
of the EPA limit 15 µg/L
Main supplier: DEWEY PUBLIC WORKS AUTHORITY · 3,490 people · 2017
2/3 SYR4
Dibromoacetic Acid
3.37 µg/L
No EPA limit set
Main supplier: DEWEY PUBLIC WORKS AUTHORITY · 3,490 people · 2019
Highest in the city: 6.2225 µg/L — WASHINGTON CO RWD #7 · 258 people · 2019
3/3 SYR4
Bromoform
4.0145 µg/L
No EPA limit set
Main supplier: DEWEY PUBLIC WORKS AUTHORITY · 3,490 people · 2019
Highest in the city: 5.9825 µg/L — WASHINGTON CO RWD #7 · 258 people · 2019
3/3 SYR4
Monochloroacetic Acid
4.235 µg/L
No EPA limit set
Main supplier: DEWEY PUBLIC WORKS AUTHORITY · 3,490 people · 2019
Highest in the city: 4.42 µg/L — WASHINGTON CO RWD #7 · 258 people · 2019
2/3 SYR4
Monobromoacetic Acid
2.014 µg/L
No EPA limit set
Highest in the city: WASHINGTON CO RWD #7 · 258 people · 2019
1/3 SYR4
Pfba
0.0110 µg/L
No EPA limit set
Main supplier: DEWEY PUBLIC WORKS AUTHORITY · 3,490 people · 2023
1/3 UCMR-5
Lead
0.0026 mg/L 17%
of the EPA limit 0.0150 mg/L
Main supplier: DEWEY PUBLIC WORKS AUTHORITY · 3,490 people · 2023
Highest in the city: 0.0047 mg/L — WASHINGTON CO RWD #7 · 258 people · 2025
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 Dewey

SupplierPopulation served
DEWEY PUBLIC WORKS AUTHORITY 3,490
WASHINGTON CO RWD #7 258
BAR-DEW WATER ASSOC INC 130

Frequently asked questions about Dewey tap water

Is Dewey tap water safe to drink?

EPA testing detected 15 contaminants in the water serving Dewey. 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 Dewey?

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

What contaminants are in Dewey's water?

The contaminants EPA monitoring detected in Dewey include Copper, TTHM, Chloroform, Total Haloacetic Acids (HAA5), Bromodichloromethane. 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.