What was found in Fairfield'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 |
|---|---|---|---|
| Fluoride | 1131 µg/L 28% of the EPA limit 4000 µg/L Main supplier: FAIRFIELD · 6,202 people · 2019 | 1/4 | SYR4 |
| Copper | 250 µg/L 19% of the EPA limit 1300 µg/L Main supplier: FAIRFIELD · 6,202 people · 2017
Highest in the city: 623.95 µg/L — JASPER WATERWORKS CORPORATION · 1,578 people · 2019 | 4/4 | SYR4 |
| Nitrate | 620 µg/L 6.2% of the EPA limit 10000 µg/L Main supplier: FAIRFIELD · 6,202 people · 2019 | 1/4 | SYR4 |
| Nitrate-Nitrite | 604 µg/L 6% of the EPA limit 10000 µg/L Main supplier: FAIRFIELD · 6,202 people · 2018 | 1/4 | SYR4 |
| Chlorite | 480 µg/L 48% of the EPA limit 1000 µg/L Main supplier: FAIRFIELD · 6,202 people · 2014 | 1/4 | SYR4 |
| TTHM | 75.04 µg/L 94% of the EPA limit 80 µg/L Main supplier: FAIRFIELD · 6,202 people · 2019 | 4/4 | SYR4 |
| Chloroform | 43.64 µg/L No EPA limit set Main supplier: FAIRFIELD · 6,202 people · 2019 | 4/4 | SYR4 |
| Barium | 43.56 µg/L 2.2% of the EPA limit 2000 µg/L Main supplier: FAIRFIELD · 6,202 people · 2019 | 1/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 39.45 µg/L 66% of the EPA limit 60 µg/L Main supplier: FAIRFIELD · 6,202 people · 2019
Highest in the city: 41.2 µg/L — JASPER WATERWORKS CORPORATION · 1,578 people · 2019 | 4/4 | SYR4 |
| Dichloroacetic Acid | 26.31 µg/L No EPA limit set Main supplier: FAIRFIELD · 6,202 people · 2019
Highest in the city: 29.56 µg/L — JASPER WATERWORKS CORPORATION · 1,578 people · 2019 | 4/4 | SYR4 |
| Bromodichloromethane | 21.04 µg/L No EPA limit set Main supplier: FAIRFIELD · 6,202 people · 2019 | 4/4 | SYR4 |
| Trichloroacetic Acid | 13.96 µg/L No EPA limit set Main supplier: FAIRFIELD · 6,202 people · 2019 | 4/4 | SYR4 |
| Dibromochloromethane | 9.624 µg/L No EPA limit set Main supplier: FAIRFIELD · 6,202 people · 2019
Highest in the city: 10.2025 µg/L — NEW HOPE WATERWORKS CORP · 1,285 people · 2019 | 4/4 | SYR4 |
| Bromoform | 1.558 µg/L No EPA limit set Main supplier: FAIRFIELD · 6,202 people · 2019
Highest in the city: 9.3595 µg/L — NEW HOPE WATERWORKS CORP · 1,285 people · 2019 | 4/4 | SYR4 |
| Lead | 1.85 µg/L 12% of the EPA limit 15 µg/L Main supplier: FAIRFIELD · 6,202 people · 2017
Highest in the city: 7.29 µg/L — BOYLESTON WATERWORKS CORP · 948 people · 2019 | 3/4 | SYR4 |
| Arsenic | 7.0775 µg/L 71% of the EPA limit 10 µg/L Main supplier: FAIRFIELD · 6,202 people · 2019 | 1/4 | SYR4 |
| Dibromoacetic Acid | 3.797 µg/L No EPA limit set Main supplier: FAIRFIELD · 6,202 people · 2019
Highest in the city: 4.532 µg/L — NEW HOPE WATERWORKS CORP · 1,285 people · 2019 | 4/4 | SYR4 |
| Monochloroacetic Acid | 4.1025 µg/L No EPA limit set Main supplier: FAIRFIELD · 6,202 people · 2019
Highest in the city: 4.515 µg/L — JASPER WATERWORKS CORPORATION · 1,578 people · 2019 | 4/4 | SYR4 |
| Monobromoacetic Acid | 1.9575 µg/L No EPA limit set Main supplier: FAIRFIELD · 6,202 people · 2019
Highest in the city: 2.48 µg/L — NEW HOPE WATERWORKS CORP · 1,285 people · 2019 | 4/4 | SYR4 |
| Atrazine | 1.887 µg/L 63% of the EPA limit 3 µg/L Main supplier: FAIRFIELD · 6,202 people · 2019 | 1/4 | SYR4 |
| Simazine | 1.38 µg/L 35% of the EPA limit 4 µg/L Main supplier: FAIRFIELD · 6,202 people · 2019 | 1/4 | SYR4 |
| Combined Radium (-226 And -228) | 0.8300 pCi/L 17% of the EPA limit 5 pCi/L Main supplier: FAIRFIELD · 6,202 people · 2014 | 1/4 | SYR4 |
| Heptachlor Epoxide | 0.0660 µg/L 33% of the EPA limit 0.2000 µg/L Main supplier: FAIRFIELD · 6,202 people · 2019 | 1/4 | SYR4 |
| Bhc-Gamma | 0.0250 µg/L 13% of the EPA limit 0.2000 µg/L Main supplier: FAIRFIELD · 6,202 people · 2019 | 1/4 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: FAIRFIELD · 6,202 people · 2025
Highest in the city: 0.0025 mg/L — NEW HOPE WATERWORKS CORP · 1,285 people · 2025 | 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 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 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 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.