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Tap water quality report

Oelwein, IA

EPA monitoring detected 7 contaminants across the 1 water supplier serving Oelwein. 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
5,920
people served
7
contaminants found
Iowa rankings Lead in Iowa PFAS in Iowa

What was found in Oelwein'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
Fluoride
924.5 µg/L 23%
of the EPA limit 4000 µg/L
Main supplier: OELWEIN MUNICIPAL WATER WORKS · 5,920 people · 2012
1/1 SYR4
Copper
144 µg/L 11%
of the EPA limit 1300 µg/L
Main supplier: OELWEIN MUNICIPAL WATER WORKS · 5,920 people · 2019
1/1 SYR4
Barium
42.04 µg/L 2.1%
of the EPA limit 2000 µg/L
Main supplier: OELWEIN MUNICIPAL WATER WORKS · 5,920 people · 2012
1/1 SYR4
Lithium
28 µg/L
No EPA limit set
Main supplier: OELWEIN MUNICIPAL WATER WORKS · 5,920 people · 2025
1/1 UCMR-5
Lead
16.8 µg/L 112%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: OELWEIN MUNICIPAL WATER WORKS · 5,920 people · 2019
1/1 SYR4
Combined Radium (-226 And -228)
3.83 pCi/L 77%
of the EPA limit 5 pCi/L
Main supplier: OELWEIN MUNICIPAL WATER WORKS · 5,920 people · 2018
1/1 SYR4
Lead
0.0042 mg/L 28%
of the EPA limit 0.0150 mg/L
Main supplier: OELWEIN MUNICIPAL WATER WORKS · 5,920 people · 2025
1/1 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 Oelwein

SupplierPopulation served
OELWEIN MUNICIPAL WATER WORKS 5,920

Frequently asked questions about Oelwein tap water

Is Oelwein tap water safe to drink?

EPA testing detected 7 contaminants in the water serving Oelwein. 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 Oelwein?

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

What contaminants are in Oelwein's water?

The contaminants EPA monitoring detected in Oelwein include Fluoride, Copper, Barium, Lithium, Lead. 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.