Is Fairfield, IL Tap Water Safe? Quality & Contaminants

What was found in Fairfield'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	1180 µg/L 30% of the EPA limit 4000 µg/L	1/4	SYR4
Copper	772 µg/L 59% of the EPA limit 1300 µg/L	4/4	SYR4
Nitrate	620 µg/L 6.2% of the EPA limit 10000 µg/L	1/4	SYR4
Nitrate-Nitrite	620 µg/L 6.2% of the EPA limit 10000 µg/L	1/4	SYR4
Chlorite	540 µg/L 54% of the EPA limit 1000 µg/L	1/4	SYR4
TTHM	91.5 µg/L 114% of the EPA limit, in the worst sample — 80 µg/L	4/4	SYR4
Total Haloacetic Acids (HAA5)	66 µg/L 110% of the EPA limit, in the worst sample — 60 µg/L	4/4	SYR4
Chloroform	58.6 µg/L No EPA limit set	4/4	SYR4
Dichloroacetic Acid	47.4 µg/L No EPA limit set	4/4	SYR4
Barium	46.8 µg/L 2.3% of the EPA limit 2000 µg/L	1/4	SYR4
Bromodichloromethane	25.6 µg/L No EPA limit set	4/4	SYR4
Dibromochloromethane	25.4 µg/L No EPA limit set	4/4	SYR4
Bromoform	21.3 µg/L No EPA limit set	4/4	SYR4
Trichloroacetic Acid	18 µg/L No EPA limit set	4/4	SYR4
Dibromoacetic Acid	7.84 µg/L No EPA limit set	4/4	SYR4
Arsenic	7.8 µg/L 78% of the EPA limit 10 µg/L	1/4	SYR4
Lead	7.29 µg/L 49% of the EPA limit 15 µg/L	3/4	SYR4
Monochloroacetic Acid	5.34 µg/L No EPA limit set	4/4	SYR4
Monobromoacetic Acid	2.48 µg/L No EPA limit set	4/4	SYR4
Atrazine	2.1 µg/L 70% of the EPA limit 3 µg/L	1/4	SYR4
Simazine	1.5 µg/L 38% of the EPA limit 4 µg/L	1/4	SYR4
Combined Radium (-226 And -228)	0.8300 pCi/L 17% of the EPA limit 5 pCi/L	1/4	SYR4
Heptachlor Epoxide	0.0660 µg/L 33% of the EPA limit 0.2000 µg/L	1/4	SYR4
Bhc-Gamma	0.0250 µg/L 13% of the EPA limit 0.2000 µg/L	1/4	SYR4
Lead	0.0025 mg/L 17% of the EPA limit 0.0150 mg/L	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 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 Fairfield

Supplier	Population served
FAIRFIELD	6,202
JASPER WATERWORKS CORPORATION	1,578
NEW HOPE WATERWORKS CORP	1,285
BOYLESTON WATERWORKS CORP	948

Frequently asked questions about Fairfield tap water

Is Fairfield tap water safe to drink?

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

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

What contaminants are in Fairfield's water?

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