Tap WaterIndex

← Oklahoma

Tap water quality report

Stilwell, OK

EPA monitoring detected 19 contaminants across the 4 water suppliers serving Stilwell. 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
7,976
people served
19
contaminants found
Oklahoma rankings Lead in Oklahoma PFAS in Oklahoma

What was found in Stilwell'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
2450 µg/L 25%
of the EPA limit 10000 µg/L
Main supplier: STILWELL · 3,276 people · 2019
1/4 SYR4
Copper
495.9 µg/L 38%
of the EPA limit 1300 µg/L
Main supplier: STILWELL · 3,276 people · 2019
Highest in the city: 1092.3 µg/L — ADAIR CO RWD #2 · 1,675 people · 2019
4/4 SYR4
Fluoride
758 µg/L 19%
of the EPA limit 4000 µg/L
Main supplier: STILWELL · 3,276 people · 2019
1/4 SYR4
Chlorite
716.35 µg/L 72%
of the EPA limit 1000 µg/L
Main supplier: STILWELL · 3,276 people · 2019
1/4 SYR4
TTHM
67.78 µg/L 85%
of the EPA limit 80 µg/L
Main supplier: STILWELL · 3,276 people · 2019
4/4 SYR4
Chloroform
53.93 µg/L
No EPA limit set
Main supplier: STILWELL · 3,276 people · 2019
4/4 SYR4
Total Haloacetic Acids (HAA5)
45.26 µg/L 75%
of the EPA limit 60 µg/L
Main supplier: STILWELL · 3,276 people · 2019
4/4 SYR4
Barium
36.8 µg/L 1.8%
of the EPA limit 2000 µg/L
Main supplier: STILWELL · 3,276 people · 2012
1/4 SYR4
Dichloroacetic Acid
23.02 µg/L
No EPA limit set
Main supplier: STILWELL · 3,276 people · 2019
4/4 SYR4
Trichloroacetic Acid
18.5 µg/L
No EPA limit set
Main supplier: STILWELL · 3,276 people · 2019
4/4 SYR4
Lead
17.095 µg/L 114%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Highest in the city: ADAIR CO RWD #2 · 1,675 people · 2019
3/4 SYR4
Bromodichloromethane
12.21 µg/L
No EPA limit set
Main supplier: STILWELL · 3,276 people · 2019
Highest in the city: 12.635 µg/L — ADAIR CO RWD #1 (CHERRY TREE) · 2,000 people · 2019
4/4 SYR4
Monochloroacetic Acid
4.515 µg/L
No EPA limit set
Main supplier: STILWELL · 3,276 people · 2019
Highest in the city: 5.1855 µg/L — ADAIR CO RWD #1 (CHERRY TREE) · 2,000 people · 2019
3/4 SYR4
Dibromochloromethane
4.33 µg/L
No EPA limit set
Main supplier: STILWELL · 3,276 people · 2019
Highest in the city: 4.378 µg/L — ADAIR CO RWD #1 (CHERRY TREE) · 2,000 people · 2019
4/4 SYR4
Dibromoacetic Acid
2.02 µg/L
No EPA limit set
Main supplier: STILWELL · 3,276 people · 2019
Highest in the city: 2.445 µg/L — ADAIR CO RWD #1 (CHERRY TREE) · 2,000 people · 2019
4/4 SYR4
Monobromoacetic Acid
1.29 µg/L
No EPA limit set
Main supplier: STILWELL · 3,276 people · 2019
1/4 SYR4
Bromoform
1.075 µg/L
No EPA limit set
Main supplier: STILWELL · 3,276 people · 2019
Highest in the city: 1.13 µg/L — ADAIR CO RWD #1 (CHERRY TREE) · 2,000 people · 2019
2/4 SYR4
2,4-D
0.3700 µg/L 0.5%
of the EPA limit 70 µg/L
Main supplier: STILWELL · 3,276 people · 2019
1/4 SYR4
Lead
0.00088 mg/L 5.9%
of the EPA limit 0.0150 mg/L
Main supplier: STILWELL · 3,276 people · 2025
Highest in the city: 0.0041 mg/L — ADAIR CO RWD #1 (CHERRY TREE) · 2,000 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 Stilwell

SupplierPopulation served
STILWELL 3,276
ADAIR CO RWD #1 (CHERRY TREE) 2,000
ADAIR CO RWD #2 1,675
ADAIR CO RWD #4 1,025

Frequently asked questions about Stilwell tap water

Is Stilwell tap water safe to drink?

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

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

What contaminants are in Stilwell's water?

The contaminants EPA monitoring detected in Stilwell include Nitrate-Nitrite, Copper, Fluoride, Chlorite, TTHM. 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.