What was found in Quincy'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 | 4500 µg/L 45% of the EPA limit 10000 µg/L Main supplier: QUINCY · 42,000 people · 2019
Highest in the city: 9100 µg/L — MILL CREEK PWD · 5,755 people · 2019 | 3/4 | SYR4 |
| Nitrate-Nitrite | 2610 µg/L 26% of the EPA limit 10000 µg/L Main supplier: QUINCY · 42,000 people · 2018
Highest in the city: 8315 µg/L — MILL CREEK PWD · 5,755 people · 2018 | 3/4 | SYR4 |
| Copper | 62.69999999999996 µg/L 4.8% of the EPA limit 1300 µg/L Main supplier: QUINCY · 42,000 people · 2017
Highest in the city: 2016 µg/L — MILL CREEK PWD · 5,755 people · 2019 | 4/4 | SYR4 |
| Fluoride | 991.6 µg/L 25% of the EPA limit 4000 µg/L Main supplier: QUINCY · 42,000 people · 2019
Highest in the city: 1175 µg/L — MILL CREEK PWD · 5,755 people · 2018 | 3/4 | SYR4 |
| Chlorite | 866.9999999999993 µg/L 87% of the EPA limit 1000 µg/L Highest in the city: IL VETERANS HOME (QUINCY) · 401 people · 2019 | 1/4 | SYR4 |
| Barium | 21.799999999999994 µg/L 1.1% of the EPA limit 2000 µg/L Main supplier: QUINCY · 42,000 people · 2019
Highest in the city: 139 µg/L — EXPRESSWAY MHP · 98 people · 2017 | 3/4 | SYR4 |
| TTHM | 77.27999999999999 µg/L 97% of the EPA limit 80 µg/L Main supplier: QUINCY · 42,000 people · 2019
Highest in the city: 88.38499999999999 µg/L — IL VETERANS HOME (QUINCY) · 401 people · 2019 | 3/4 | SYR4 |
| Chloroform | 70.18499999999999 µg/L No EPA limit set Main supplier: QUINCY · 42,000 people · 2019
Highest in the city: 76.22999999999999 µg/L — IL VETERANS HOME (QUINCY) · 401 people · 2019 | 3/4 | SYR4 |
| Lead | 34.150000000000006 µg/L 228% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: QUINCY · 42,000 people · 2017
Highest in the city: 65.79 µg/L — IL VETERANS HOME (QUINCY) · 401 people · 2019 | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 41.584999999999994 µg/L 69% of the EPA limit 60 µg/L Main supplier: QUINCY · 42,000 people · 2019
Highest in the city: 48.235 µg/L — IL VETERANS HOME (QUINCY) · 401 people · 2019 | 3/4 | SYR4 |
| Dichloroacetic Acid | 31.029999999999998 µg/L No EPA limit set Main supplier: QUINCY · 42,000 people · 2019
Highest in the city: 36.99999999999999 µg/L — IL VETERANS HOME (QUINCY) · 401 people · 2019 | 2/4 | SYR4 |
| Lithium | 20 µg/L No EPA limit set Highest in the city: MILL CREEK PWD · 5,755 people · 2023 | 1/4 | UCMR-5 |
| Monobromoacetic Acid | 13.659999999999997 µg/L No EPA limit set Main supplier: QUINCY · 42,000 people · 2019 | 1/4 | SYR4 |
| Trichloroacetic Acid | 13.454999999999998 µg/L No EPA limit set Main supplier: QUINCY · 42,000 people · 2019 | 2/4 | SYR4 |
| Bromodichloromethane | 9.001499999999998 µg/L No EPA limit set Main supplier: QUINCY · 42,000 people · 2019
Highest in the city: 12.024999999999999 µg/L — IL VETERANS HOME (QUINCY) · 401 people · 2019 | 3/4 | SYR4 |
| Selenium | 3.2 µg/L 6.4% of the EPA limit 50 µg/L Main supplier: QUINCY · 42,000 people · 2019
Highest in the city: 5.324999999999999 µg/L — MILL CREEK PWD · 5,755 people · 2018 | 3/4 | SYR4 |
| Chromium | 5.1 µg/L 5.1% of the EPA limit 100 µg/L Highest in the city: MILL CREEK PWD · 5,755 people · 2018 | 1/4 | SYR4 |
| Monochloroacetic Acid | 4.5935 µg/L No EPA limit set Main supplier: QUINCY · 42,000 people · 2019 | 2/4 | SYR4 |
| Bromoform | 4.215 µg/L No EPA limit set Highest in the city: MILL CREEK PWD · 5,755 people · 2019 | 2/4 | SYR4 |
| Dibromochloromethane | 2.509 µg/L No EPA limit set Main supplier: QUINCY · 42,000 people · 2019
Highest in the city: 3.8819999999999997 µg/L — MILL CREEK PWD · 5,755 people · 2019 | 3/4 | SYR4 |
| Dibromoacetic Acid | 2.2859999999999996 µg/L No EPA limit set Highest in the city: MILL CREEK PWD · 5,755 people · 2019 | 2/4 | SYR4 |
| Combined Radium (-226 And -228) | 1.4 pCi/L 28% of the EPA limit 5 pCi/L Highest in the city: EXPRESSWAY MHP · 98 people · 2014 | 2/4 | SYR4 |
| Arsenic | 1.3 µg/L 13% of the EPA limit 10 µg/L Main supplier: QUINCY · 42,000 people · 2019 | 3/4 | SYR4 |
| Toluene | 1.1705 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: QUINCY · 42,000 people · 2019 | 1/4 | SYR4 |
| Pfba | 0.0135 µg/L No EPA limit set Main supplier: QUINCY · 42,000 people · 2025 | 1/4 | UCMR-5 |
| PFBS | 0.0057 µg/L No EPA limit set Main supplier: QUINCY · 42,000 people · 2025 | 1/4 | UCMR-5 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: QUINCY · 42,000 people · 2025
Highest in the city: 0.0046 mg/L — EXPRESSWAY MHP · 98 people · 2024 | 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 Quincy
| Supplier | Population served |
|---|---|
| QUINCY | 42,000 |
| MILL CREEK PWD | 5,755 |
| IL VETERANS HOME (QUINCY) | 401 |
| EXPRESSWAY MHP | 98 |
Frequently asked questions about Quincy tap water
Is Quincy tap water safe to drink?
EPA testing detected 27 contaminants in the water serving Quincy. 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 Quincy?
4 public water suppliers report drinking-water monitoring for Quincy, Illinois to the EPA. Each is listed above with its population served.
What contaminants are in Quincy's water?
The contaminants EPA monitoring detected in Quincy include Nitrate, Nitrate-Nitrite, Copper, Fluoride, 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.