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Tap water quality report

Oskaloosa, IA

EPA monitoring detected 17 contaminants across the 3 water suppliers serving Oskaloosa. 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.

3
water suppliers
22,791
people served
17
contaminants found
Iowa rankings Lead in Iowa PFAS in Iowa

What was found in Oskaloosa'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
Nitrate
1800 µg/L 18%
of the EPA limit 10000 µg/L
Main supplier: OSKALOOSA MUNICIPAL WATER DEPT · 12,808 people · 2019
2/3 SYR4
Fluoride
220 µg/L 5.5%
of the EPA limit 4000 µg/L
Main supplier: OSKALOOSA MUNICIPAL WATER DEPT · 12,808 people · 2013
Highest in the city: 1000 µg/L — MAHASKA RURAL WATER SYSTEM, INC. · 9,818 people · 2019
2/3 SYR4
TTHM
60.87 µg/L 76%
of the EPA limit 80 µg/L
Main supplier: OSKALOOSA MUNICIPAL WATER DEPT · 12,808 people · 2019
2/3 SYR4
Copper
40 µg/L 3.1%
of the EPA limit 1300 µg/L
Main supplier: OSKALOOSA MUNICIPAL WATER DEPT · 12,808 people · 2019
2/3 SYR4
Chloroform
37.07 µg/L
No EPA limit set
Main supplier: OSKALOOSA MUNICIPAL WATER DEPT · 12,808 people · 2019
2/3 SYR4
Total Haloacetic Acids (HAA5)
22.66 µg/L 38%
of the EPA limit 60 µg/L
Main supplier: OSKALOOSA MUNICIPAL WATER DEPT · 12,808 people · 2019
Highest in the city: 23.6 µg/L — MAHASKA RURAL WATER SYSTEM, INC. · 9,818 people · 2019
2/3 SYR4
Bromodichloromethane
17 µg/L
No EPA limit set
Main supplier: OSKALOOSA MUNICIPAL WATER DEPT · 12,808 people · 2019
2/3 SYR4
Monochloroacetic Acid
10.106 µg/L
No EPA limit set
Main supplier: OSKALOOSA MUNICIPAL WATER DEPT · 12,808 people · 2019
Highest in the city: 14.24 µg/L — MAHASKA RURAL WATER SYSTEM, INC. · 9,818 people · 2019
2/3 SYR4
Lithium
14 µg/L
No EPA limit set
Main supplier: OSKALOOSA MUNICIPAL WATER DEPT · 12,808 people · 2025
1/3 UCMR-5
Lead
12.39 µg/L 83%
of the EPA limit 15 µg/L
Main supplier: OSKALOOSA MUNICIPAL WATER DEPT · 12,808 people · 2019
2/3 SYR4
Dichloroacetic Acid
10.805 µg/L
No EPA limit set
Main supplier: OSKALOOSA MUNICIPAL WATER DEPT · 12,808 people · 2019
2/3 SYR4
Dibromochloromethane
10.52 µg/L
No EPA limit set
Main supplier: OSKALOOSA MUNICIPAL WATER DEPT · 12,808 people · 2019
2/3 SYR4
Monobromoacetic Acid
7.278 µg/L
No EPA limit set
Main supplier: OSKALOOSA MUNICIPAL WATER DEPT · 12,808 people · 2019
1/3 SYR4
Trichloroacetic Acid
4.275 µg/L
No EPA limit set
Main supplier: OSKALOOSA MUNICIPAL WATER DEPT · 12,808 people · 2019
2/3 SYR4
Dibromoacetic Acid
4.0715 µg/L
No EPA limit set
Main supplier: OSKALOOSA MUNICIPAL WATER DEPT · 12,808 people · 2019
2/3 SYR4
Bromoform
2.855 µg/L
No EPA limit set
Main supplier: OSKALOOSA MUNICIPAL WATER DEPT · 12,808 people · 2019
2/3 SYR4
Lead
0.0013 mg/L 8.7%
of the EPA limit 0.0150 mg/L
Main supplier: OSKALOOSA MUNICIPAL WATER DEPT · 12,808 people · 2025
2/3 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 Oskaloosa

SupplierPopulation served
OSKALOOSA MUNICIPAL WATER DEPT 12,808
MAHASKA RURAL WATER SYSTEM, INC. 9,818
OAK CREEK MHP 165

Frequently asked questions about Oskaloosa tap water

Is Oskaloosa tap water safe to drink?

EPA testing detected 17 contaminants in the water serving Oskaloosa. 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 Oskaloosa?

3 public water suppliers report drinking-water monitoring for Oskaloosa, Iowa to the EPA. Each is listed above with its population served.

What contaminants are in Oskaloosa's water?

The contaminants EPA monitoring detected in Oskaloosa include Nitrate, Fluoride, TTHM, Copper, Chloroform. 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.