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Tap water quality report

Storm Lake, IA

EPA monitoring detected 16 contaminants across the 2 water suppliers serving Storm Lake. 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.

2
water suppliers
11,606
people served
16
contaminants found
Iowa rankings Lead in Iowa PFAS in Iowa

What was found in Storm Lake'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
840 µg/L 21%
of the EPA limit 4000 µg/L
Main supplier: STORM LAKE WATER TREATMENT PLANT · 11,431 people · 2019
1/2 SYR4
Nitrite
521 µg/L 52%
of the EPA limit 1000 µg/L
Main supplier: STORM LAKE WATER TREATMENT PLANT · 11,431 people · 2019
1/2 SYR4
Chlorite
380.95 µg/L 38%
of the EPA limit 1000 µg/L
Main supplier: STORM LAKE WATER TREATMENT PLANT · 11,431 people · 2019
1/2 SYR4
Nitrate
242 µg/L 2.4%
of the EPA limit 10000 µg/L
Main supplier: STORM LAKE WATER TREATMENT PLANT · 11,431 people · 2019
1/2 SYR4
Lithium
130 µg/L
No EPA limit set
Main supplier: STORM LAKE WATER TREATMENT PLANT · 11,431 people · 2024
1/2 UCMR-5
Copper
68.425 µg/L 5.3%
of the EPA limit 1300 µg/L
Main supplier: STORM LAKE WATER TREATMENT PLANT · 11,431 people · 2019
1/2 SYR4
Chloroform
11 µg/L
No EPA limit set
Main supplier: STORM LAKE WATER TREATMENT PLANT · 11,431 people · 2019
1/2 SYR4
Total Haloacetic Acids (HAA5)
6.9675 µg/L 12%
of the EPA limit 60 µg/L
Main supplier: STORM LAKE WATER TREATMENT PLANT · 11,431 people · 2019
1/2 SYR4
Lead
5.96 µg/L 40%
of the EPA limit 15 µg/L
Main supplier: STORM LAKE WATER TREATMENT PLANT · 11,431 people · 2019
1/2 SYR4
Barium
5.49 µg/L 0.3%
of the EPA limit 2000 µg/L
Main supplier: STORM LAKE WATER TREATMENT PLANT · 11,431 people · 2013
1/2 SYR4
Monochloroacetic Acid
3.6585 µg/L
No EPA limit set
Main supplier: STORM LAKE WATER TREATMENT PLANT · 11,431 people · 2019
1/2 SYR4
Arsenic
3.504 µg/L 35%
of the EPA limit 10 µg/L
Main supplier: STORM LAKE WATER TREATMENT PLANT · 11,431 people · 2016
1/2 SYR4
Dichloroacetic Acid
2.241 µg/L
No EPA limit set
Main supplier: STORM LAKE WATER TREATMENT PLANT · 11,431 people · 2019
2/2 SYR4
Trichloroacetic Acid
1.025 µg/L
No EPA limit set
Main supplier: STORM LAKE WATER TREATMENT PLANT · 11,431 people · 2019
1/2 SYR4
Dibromoacetic Acid
0.5895 µg/L
No EPA limit set
Main supplier: STORM LAKE WATER TREATMENT PLANT · 11,431 people · 2019
1/2 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: STORM LAKE WATER TREATMENT PLANT · 11,431 people · 2025
Highest in the city: 0.00010 mg/L — LAKE CREEK HOMEOWNERS ASSOCIATION · 175 people · 2023
2/2 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 Storm Lake

SupplierPopulation served
STORM LAKE WATER TREATMENT PLANT 11,431
LAKE CREEK HOMEOWNERS ASSOCIATION 175

Frequently asked questions about Storm Lake tap water

Is Storm Lake tap water safe to drink?

EPA testing detected 16 contaminants in the water serving Storm Lake. 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 Storm Lake?

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

What contaminants are in Storm Lake's water?

The contaminants EPA monitoring detected in Storm Lake include Fluoride, Nitrite, Chlorite, Nitrate, 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.