Tap WaterIndex

← Illinois

Tap water quality report

Waterloo, IL

EPA monitoring detected 16 contaminants across the 1 water supplier serving Waterloo. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

1
water supplier
10,190
people served
16
contaminants found
Illinois rankings Lead in Illinois PFAS in Illinois

What was found in Waterloo'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.

ContaminantLevel vs EPA limitSuppliersSource
Copper
1367.9999999999977 µg/L 105%
of the EPA limit, at the 95th percentile of samples — 1300 µg/L
Main supplier: WATERLOO · 10,190 people · 2019
1/1 SYR4
TTHM
69.71999999999996 µg/L 87%
of the EPA limit 80 µg/L
Main supplier: WATERLOO · 10,190 people · 2019
1/1 SYR4
Chloroform
55.45499999999993 µg/L
No EPA limit set
Main supplier: WATERLOO · 10,190 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
22.759999999999994 µg/L 38%
of the EPA limit 60 µg/L
Main supplier: WATERLOO · 10,190 people · 2019
1/1 SYR4
Lithium
19.5 µg/L
No EPA limit set
Main supplier: WATERLOO · 10,190 people · 2025
1/1 UCMR-5
Dichloroacetic Acid
13.379999999999995 µg/L
No EPA limit set
Main supplier: WATERLOO · 10,190 people · 2019
1/1 SYR4
Bromodichloromethane
10.219999999999999 µg/L
No EPA limit set
Main supplier: WATERLOO · 10,190 people · 2019
1/1 SYR4
Trichloroacetic Acid
8.1 µg/L
No EPA limit set
Main supplier: WATERLOO · 10,190 people · 2019
1/1 SYR4
Lead
6.04 µg/L 40%
of the EPA limit 15 µg/L
Main supplier: WATERLOO · 10,190 people · 2019
1/1 SYR4
Dibromochloromethane
4.334999999999995 µg/L
No EPA limit set
Main supplier: WATERLOO · 10,190 people · 2019
1/1 SYR4
Monochloroacetic Acid
3.3 µg/L
No EPA limit set
Main supplier: WATERLOO · 10,190 people · 2019
1/1 SYR4
Monobromoacetic Acid
1.425 µg/L
No EPA limit set
Main supplier: WATERLOO · 10,190 people · 2019
1/1 SYR4
Dibromoacetic Acid
1.3549999999999998 µg/L
No EPA limit set
Main supplier: WATERLOO · 10,190 people · 2019
1/1 SYR4
Pfba
0.0169 µg/L
No EPA limit set
Main supplier: WATERLOO · 10,190 people · 2025
1/1 UCMR-5
Lead
0.0044 mg/L 29%
of the EPA limit 0.0150 mg/L
Main supplier: WATERLOO · 10,190 people · 2025
1/1 LCR
Pfpea
0.0032 µg/L
No EPA limit set
Main supplier: WATERLOO · 10,190 people · 2025
1/1 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 Waterloo

SupplierPopulation served
WATERLOO 10,190

Frequently asked questions about Waterloo tap water

Is Waterloo tap water safe to drink?

EPA testing detected 16 contaminants in the water serving Waterloo. 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 Waterloo?

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

What contaminants are in Waterloo's water?

The contaminants EPA monitoring detected in Waterloo include Copper, TTHM, Chloroform, Total Haloacetic Acids (HAA5), Lithium. 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.