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Tap water quality report

Wilmington, OH

EPA monitoring detected 25 contaminants across the 1 water supplier serving Wilmington. 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.

1
water supplier
12,401
people served
25
contaminants found
Ohio rankings Lead in Ohio PFAS in Ohio

What was found in Wilmington'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
3100 µg/L 31%
of the EPA limit 10000 µg/L
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2019
1/1 SYR4
Nitrate-Nitrite
3095 µg/L 31%
of the EPA limit 10000 µg/L
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2019
1/1 SYR4
Copper
1322.05 µg/L 102%
of the EPA limit, at the 95th percentile of samples — 1300 µg/L
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2019
1/1 SYR4
Fluoride
237 µg/L 5.9%
of the EPA limit 4000 µg/L
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2019
1/1 SYR4
TTHM
84.34 µg/L 105%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2019
1/1 SYR4
Chloroform
69.04 µg/L
No EPA limit set
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
36.17 µg/L 60%
of the EPA limit 60 µg/L
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2019
1/1 SYR4
Lead
35.725 µg/L 238%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2019
1/1 SYR4
Dichloroacetic Acid
26.34 µg/L
No EPA limit set
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2019
1/1 SYR4
Bromodichloromethane
13.22 µg/L
No EPA limit set
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2019
1/1 SYR4
Trichloroacetic Acid
12.265 µg/L
No EPA limit set
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2019
1/1 SYR4
Dibromoacetic Acid
5.29 µg/L
No EPA limit set
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2019
1/1 SYR4
Dibromochloromethane
3.88 µg/L
No EPA limit set
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2019
1/1 SYR4
Monochloroacetic Acid
3.8 µg/L
No EPA limit set
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2019
1/1 SYR4
Monobromoacetic Acid
1.87 µg/L
No EPA limit set
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2019
1/1 SYR4
Atrazine
1.008 µg/L 34%
of the EPA limit 3 µg/L
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2019
1/1 SYR4
Bromoform
0.6865 µg/L
No EPA limit set
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2019
1/1 SYR4
Simazine
0.3500 µg/L 8.8%
of the EPA limit 4 µg/L
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2019
1/1 SYR4
Pfpea
0.0098 µg/L
No EPA limit set
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2023
1/1 UCMR-5
Pfhxa
0.0082 µg/L
No EPA limit set
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2023
1/1 UCMR-5
PFOS
0.0073 µg/L
No EPA limit set
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2023
1/1 UCMR-5
PFHXS
0.0070 µg/L
No EPA limit set
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2023
1/1 UCMR-5
Pfba
0.0058 µg/L
No EPA limit set
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2023
1/1 UCMR-5
Pfhpa
0.0050 µg/L
No EPA limit set
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2023
1/1 UCMR-5
Lead
0.00080 mg/L 5.3%
of the EPA limit 0.0150 mg/L
Main supplier: WILMINGTON CITY PWS · 12,401 people · 2025
1/1 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 Wilmington

SupplierPopulation served
WILMINGTON CITY PWS 12,401

Frequently asked questions about Wilmington tap water

Is Wilmington tap water safe to drink?

EPA testing detected 25 contaminants in the water serving Wilmington. 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 Wilmington?

1 public water supplier report drinking-water monitoring for Wilmington, Ohio to the EPA. Each is listed above with its population served.

What contaminants are in Wilmington's water?

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