What was found in Edwardsville'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 |
|---|---|---|---|
| Nitrate | 1300 µg/L 13% of the EPA limit 10000 µg/L Main supplier: EDWARDSVILLE · 26,808 people · 2019 | 2/6 | SYR4 |
| Nitrate-Nitrite | 1261 µg/L 13% of the EPA limit 10000 µg/L Main supplier: EDWARDSVILLE · 26,808 people · 2018 | 2/6 | SYR4 |
| Fluoride | 1129 µg/L 28% of the EPA limit 4000 µg/L Main supplier: EDWARDSVILLE · 26,808 people · 2018
Highest in the city: 1196 µg/L — HOLIDAY SHORES SD · 2,840 people · 2019 | 2/6 | SYR4 |
| Copper | 666.9999999999995 µg/L 51% of the EPA limit 1300 µg/L Main supplier: EDWARDSVILLE · 26,808 people · 2017
Highest in the city: 1180.999999999998 µg/L — SOUTHERN IL UNIVERSITY-EDWARDSVILLE · 2,817 people · 2019 | 5/6 | SYR4 |
| TTHM | 32.080999999999996 µg/L 40% of the EPA limit 80 µg/L Main supplier: EDWARDSVILLE · 26,808 people · 2019
Highest in the city: 106.81999999999996 µg/L — HOLIDAY SHORES SD · 2,840 people · 2019 | 5/6 | SYR4 |
| Chloroform | 11.2 µg/L No EPA limit set Main supplier: EDWARDSVILLE · 26,808 people · 2019
Highest in the city: 92.96199999999999 µg/L — HOLIDAY SHORES SD · 2,840 people · 2019 | 5/6 | SYR4 |
| Barium | 83.7 µg/L 4.2% of the EPA limit 2000 µg/L Main supplier: EDWARDSVILLE · 26,808 people · 2018 | 2/6 | SYR4 |
| Total Haloacetic Acids (HAA5) | 9.502499999999996 µg/L 16% of the EPA limit 60 µg/L Main supplier: EDWARDSVILLE · 26,808 people · 2019
Highest in the city: 70.57999999999998 µg/L — HOLIDAY SHORES SD · 2,840 people · 2019 | 5/6 | SYR4 |
| Trichloroacetic Acid | 3.5599999999999987 µg/L No EPA limit set Main supplier: EDWARDSVILLE · 26,808 people · 2019
Highest in the city: 45.379999999999995 µg/L — HOLIDAY SHORES SD · 2,840 people · 2019 | 5/6 | SYR4 |
| Lead | 4.514999999999999 µg/L 30% of the EPA limit 15 µg/L Main supplier: EDWARDSVILLE · 26,808 people · 2017
Highest in the city: 33.53000000000005 µg/L — SOUTHERN IL UNIVERSITY-EDWARDSVILLE · 2,817 people · 2019 | 4/6 | SYR4 |
| Dichloroacetic Acid | 5.47 µg/L No EPA limit set Main supplier: EDWARDSVILLE · 26,808 people · 2019
Highest in the city: 32.13999999999999 µg/L — HOLIDAY SHORES SD · 2,840 people · 2019 | 5/6 | SYR4 |
| Bromodichloromethane | 10.924499999999998 µg/L No EPA limit set Main supplier: EDWARDSVILLE · 26,808 people · 2019
Highest in the city: 24.835 µg/L — NORTH EAST CENTRAL PWD · 3,975 people · 2019 | 5/6 | SYR4 |
| Dibromochloromethane | 7.7730999999999995 µg/L No EPA limit set Main supplier: EDWARDSVILLE · 26,808 people · 2019
Highest in the city: 12.339999999999998 µg/L — NORTH EAST CENTRAL PWD · 3,975 people · 2019 | 5/6 | SYR4 |
| Monobromoacetic Acid | 3.38 µg/L No EPA limit set Main supplier: EDWARDSVILLE · 26,808 people · 2019
Highest in the city: 8.717499999999998 µg/L — NORTH EAST CENTRAL PWD · 3,975 people · 2019 | 4/6 | SYR4 |
| Arsenic | 1 µg/L 10% of the EPA limit 10 µg/L Main supplier: EDWARDSVILLE · 26,808 people · 2018
Highest in the city: 3.8 µg/L — HOLIDAY SHORES SD · 2,840 people · 2019 | 2/6 | SYR4 |
| Monochloroacetic Acid | 3.61 µg/L No EPA limit set Highest in the city: HOLIDAY SHORES SD · 2,840 people · 2019 | 2/6 | SYR4 |
| Dibromoacetic Acid | 2.9 µg/L No EPA limit set Main supplier: EDWARDSVILLE · 26,808 people · 2019 | 4/6 | SYR4 |
| Bromoform | 2.2609999999999992 µg/L No EPA limit set Main supplier: EDWARDSVILLE · 26,808 people · 2019
Highest in the city: 2.295 µg/L — SOUTHERN IL UNIVERSITY-EDWARDSVILLE · 2,817 people · 2019 | 4/6 | SYR4 |
| Combined Radium (-226 And -228) | 1.328 pCi/L 27% of the EPA limit 5 pCi/L Main supplier: EDWARDSVILLE · 26,808 people · 2014 | 2/6 | SYR4 |
| Atrazine | 1.1179999999999999 µg/L 37% of the EPA limit 3 µg/L Highest in the city: HOLIDAY SHORES SD · 2,840 people · 2019 | 1/6 | SYR4 |
| Pfba | 0.0270 µg/L No EPA limit set Highest in the city: NORTH EAST CENTRAL PWD · 3,975 people · 2024 | 1/6 | UCMR-5 |
| Pfpea | 0.0045 µg/L No EPA limit set Highest in the city: NORTH EAST CENTRAL PWD · 3,975 people · 2024 | 2/6 | UCMR-5 |
| PFOA | 0.0041 µg/L No EPA limit set Highest in the city: NORTH EAST CENTRAL PWD · 3,975 people · 2024 | 1/6 | UCMR-5 |
| PFOS | 0.0041 µg/L No EPA limit set Highest in the city: NORTH EAST CENTRAL PWD · 3,975 people · 2024 | 1/6 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: EDWARDSVILLE · 26,808 people · 2026
Highest in the city: 0.0037 mg/L — HOLIDAY SHORES SD · 2,840 people · 2025 | 6/6 | LCR |
| PFBS | 0.0035 µg/L No EPA limit set Main supplier: EDWARDSVILLE · 26,808 people · 2024
Highest in the city: 0.0037 µg/L — SOUTHERN IL UNIVERSITY-EDWARDSVILLE · 2,817 people · 2023 | 2/6 | UCMR-5 |
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 Edwardsville
| Supplier | Population served |
|---|---|
| EDWARDSVILLE | 26,808 |
| NORTH EAST CENTRAL PWD | 3,975 |
| HOLIDAY SHORES SD | 2,840 |
| SOUTHERN IL UNIVERSITY-EDWARDSVILLE | 2,817 |
| UNIVERSITY FLATS MHP | 203 |
| QUAIL RUN MOBILE HOME PARK | 168 |
Frequently asked questions about Edwardsville tap water
Is Edwardsville tap water safe to drink?
EPA testing detected 26 contaminants in the water serving Edwardsville. 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 Edwardsville?
6 public water suppliers report drinking-water monitoring for Edwardsville, Illinois to the EPA. Each is listed above with its population served.
What contaminants are in Edwardsville's water?
The contaminants EPA monitoring detected in Edwardsville include Nitrate, Nitrate-Nitrite, Fluoride, Copper, TTHM. 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.