Is Louisville, OH Tap Water Safe? Quality & Contaminants

What was found in Louisville's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Fluoride	2180 µg/L 55% of the EPA limit 4000 µg/L	4/5	SYR4
Copper	1910 µg/L 147% of the EPA limit, in the worst sample — 1300 µg/L	5/5	SYR4
Nitrate	270 µg/L 2.7% of the EPA limit 10000 µg/L	1/5	SYR4
Nitrate-Nitrite	270 µg/L 2.7% of the EPA limit 10000 µg/L	1/5	SYR4
TTHM	148.1 µg/L 185% of the EPA limit, in the worst sample — 80 µg/L	5/5	SYR4
Barium	138 µg/L 6.9% of the EPA limit 2000 µg/L	4/5	SYR4
Chloroform	103 µg/L No EPA limit set	5/5	SYR4
Total Haloacetic Acids (HAA5)	99.6 µg/L 166% of the EPA limit, in the worst sample — 60 µg/L	5/5	SYR4
Dichloroacetic Acid	58.6 µg/L No EPA limit set	5/5	SYR4
Bromodichloromethane	58.3 µg/L No EPA limit set	5/5	SYR4
Dibromochloromethane	35.7 µg/L No EPA limit set	5/5	SYR4
Trichloroacetic Acid	27.5 µg/L No EPA limit set	5/5	SYR4
Chromium	26 µg/L 26% of the EPA limit 100 µg/L	3/5	SYR4
Monochloroacetic Acid	22.4 µg/L No EPA limit set	4/5	SYR4
Lead	22 µg/L 147% of the EPA limit, in the worst sample — 15 µg/L	4/5	SYR4
Dibromoacetic Acid	18 µg/L No EPA limit set	5/5	SYR4
Bromoform	16.9 µg/L No EPA limit set	5/5	SYR4
Lithium	9 µg/L No EPA limit set	1/5	UCMR-5
Monobromoacetic Acid	2.5 µg/L No EPA limit set	3/5	SYR4
Selenium	1.52 µg/L 3% of the EPA limit 50 µg/L	3/5	SYR4
P-Dichlorobenzene	0.7000 µg/L 0.9% of the EPA limit 75 µg/L	1/5	SYR4
Pfpea	0.0030 µg/L No EPA limit set	1/5	UCMR-5
Lead	0.0012 mg/L 8.3% of the EPA limit 0.0150 mg/L	5/5	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 single worst sample on record — 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 Louisville

Supplier	Population served
LOUISVILLE CITY PWS	9,186
EAST CANTON VILLAGE PWS	1,606
GREEN MEADOWS HEALTH AND WELLNESS CENTER	182
LOUISVILLE CENTER FOR REHABILITATION	172
LOUISVILLE GARDENS HEALTH CENTER	81

Frequently asked questions about Louisville tap water

Is Louisville tap water safe to drink?

EPA testing detected 23 contaminants in the water serving Louisville. 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 Louisville?

5 public water suppliers report drinking-water monitoring for Louisville, Ohio to the EPA. Each is listed above with its population served.

What contaminants are in Louisville's water?

The contaminants EPA monitoring detected in Louisville include Fluoride, Copper, Nitrate, Nitrate-Nitrite, TTHM. The full list, with the highest level found 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.