Is Herrin, IL Tap Water Safe? Quality & Contaminants

What was found in Herrin'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	59.25 µg/L 74% of the EPA limit 80 µg/L Main supplier: HERRIN · 12,747 people · 2019	1/1	SYR4
Copper	57.099999999999994 µg/L 4.4% of the EPA limit 1300 µg/L Main supplier: HERRIN · 12,747 people · 2017	1/1	SYR4
Chloroform	50.28 µg/L No EPA limit set Main supplier: HERRIN · 12,747 people · 2019	1/1	SYR4
Total Haloacetic Acids (HAA5)	33 µg/L 55% of the EPA limit 60 µg/L Main supplier: HERRIN · 12,747 people · 2019	1/1	SYR4
Dichloroacetic Acid	23.6 µg/L No EPA limit set Main supplier: HERRIN · 12,747 people · 2019	1/1	SYR4
Monobromoacetic Acid	20.359999999999996 µg/L No EPA limit set Main supplier: HERRIN · 12,747 people · 2019	1/1	SYR4
Lead	11 µg/L 73% of the EPA limit 15 µg/L Main supplier: HERRIN · 12,747 people · 2017	1/1	SYR4
Bromodichloromethane	10.9375 µg/L No EPA limit set Main supplier: HERRIN · 12,747 people · 2019	1/1	SYR4
Trichloroacetic Acid	6.614499999999996 µg/L No EPA limit set Main supplier: HERRIN · 12,747 people · 2019	1/1	SYR4
Dibromochloromethane	4.392999999999999 µg/L No EPA limit set Main supplier: HERRIN · 12,747 people · 2019	1/1	SYR4
Monochloroacetic Acid	4.252999999999998 µg/L No EPA limit set Main supplier: HERRIN · 12,747 people · 2019	1/1	SYR4
Dibromoacetic Acid	1.8789999999999996 µg/L No EPA limit set Main supplier: HERRIN · 12,747 people · 2019	1/1	SYR4
Bromoform	0.7746 µg/L No EPA limit set Main supplier: HERRIN · 12,747 people · 2019	1/1	SYR4
Pfba	0.0110 µg/L No EPA limit set Main supplier: HERRIN · 12,747 people · 2025	1/1	UCMR-5
Lead	0.0100 mg/L 67% of the EPA limit 0.0150 mg/L Main supplier: HERRIN · 12,747 people · 2026	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 Herrin

Supplier	Population served
HERRIN	12,747

Frequently asked questions about Herrin tap water

Is Herrin tap water safe to drink?

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

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

What contaminants are in Herrin's water?

The contaminants EPA monitoring detected in Herrin include TTHM, Copper, Chloroform, 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.