Is Niles, OH Tap Water Safe? Quality & Contaminants

What was found in Niles'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.

Contaminant	Level vs EPA limit	Suppliers	Source
TTHM	81.755 µg/L 102% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: NILES CITY PWS · 21,961 people · 2019	1/1	SYR4
Chloroform	71.235 µg/L No EPA limit set Main supplier: NILES CITY PWS · 21,961 people · 2019	1/1	SYR4
Copper	68.75 µg/L 5.3% of the EPA limit 1300 µg/L Main supplier: NILES CITY PWS · 21,961 people · 2017	1/1	SYR4
Total Haloacetic Acids (HAA5)	52.425 µg/L 87% of the EPA limit 60 µg/L Main supplier: NILES CITY PWS · 21,961 people · 2019	1/1	SYR4
Dichloroacetic Acid	43.65 µg/L No EPA limit set Main supplier: NILES CITY PWS · 21,961 people · 2019	1/1	SYR4
Bromodichloromethane	10.9 µg/L No EPA limit set Main supplier: NILES CITY PWS · 21,961 people · 2019	1/1	SYR4
Trichloroacetic Acid	9.917 µg/L No EPA limit set Main supplier: NILES CITY PWS · 21,961 people · 2019	1/1	SYR4
Monobromoacetic Acid	9.702 µg/L No EPA limit set Main supplier: NILES CITY PWS · 21,961 people · 2019	1/1	SYR4
Lead	9.48 µg/L 63% of the EPA limit 15 µg/L Main supplier: NILES CITY PWS · 21,961 people · 2017	1/1	SYR4
Dibromoacetic Acid	9.354 µg/L No EPA limit set Main supplier: NILES CITY PWS · 21,961 people · 2019	1/1	SYR4
Monochloroacetic Acid	7.993 µg/L No EPA limit set Main supplier: NILES CITY PWS · 21,961 people · 2019	1/1	SYR4
Bromoform	4.95 µg/L No EPA limit set Main supplier: NILES CITY PWS · 21,961 people · 2019	1/1	SYR4
Dibromochloromethane	3.781 µg/L No EPA limit set Main supplier: NILES CITY PWS · 21,961 people · 2019	1/1	SYR4
PFOS	0.0090 µg/L No EPA limit set Main supplier: NILES CITY PWS · 21,961 people · 2025	1/1	UCMR-5
Pfba	0.0059 µg/L No EPA limit set Main supplier: NILES CITY PWS · 21,961 people · 2025	1/1	UCMR-5
PFHXS	0.0036 µg/L No EPA limit set Main supplier: NILES CITY PWS · 21,961 people · 2025	1/1	UCMR-5
Lead	0.00076 mg/L 5.1% of the EPA limit 0.0150 mg/L Main supplier: NILES CITY PWS · 21,961 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 Niles

Supplier	Population served
NILES CITY PWS	21,961

Frequently asked questions about Niles tap water

Is Niles tap water safe to drink?

EPA testing detected 17 contaminants in the water serving Niles. 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 Niles?

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

What contaminants are in Niles's water?

The contaminants EPA monitoring detected in Niles include TTHM, Chloroform, Copper, Total Haloacetic Acids (HAA5), Dichloroacetic Acid. 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.