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Tap water quality report

Grinnell, IA

EPA monitoring detected 18 contaminants across the 2 water suppliers serving Grinnell. 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
9,877
people served
18
contaminants found
Iowa rankings Lead in Iowa PFAS in Iowa

What was found in Grinnell'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
1200 µg/L 30%
of the EPA limit 4000 µg/L
Main supplier: GRINNELL WATER DEPARTMENT · 9,564 people · 2013
1/2 SYR4
Nitrate
1200 µg/L 12%
of the EPA limit 10000 µg/L
Main supplier: GRINNELL WATER DEPARTMENT · 9,564 people · 2019
1/2 SYR4
Copper
356 µg/L 27%
of the EPA limit 1300 µg/L
Main supplier: GRINNELL WATER DEPARTMENT · 9,564 people · 2019
1/2 SYR4
Lithium
140 µg/L
No EPA limit set
Main supplier: GRINNELL WATER DEPARTMENT · 9,564 people · 2024
1/2 UCMR-5
Lead
10.5 µg/L 70%
of the EPA limit 15 µg/L
Main supplier: GRINNELL WATER DEPARTMENT · 9,564 people · 2019
1/2 SYR4
TTHM
10.228 µg/L 13%
of the EPA limit 80 µg/L
Main supplier: GRINNELL WATER DEPARTMENT · 9,564 people · 2019
1/2 SYR4
Total Haloacetic Acids (HAA5)
6.857 µg/L 11%
of the EPA limit 60 µg/L
Main supplier: GRINNELL WATER DEPARTMENT · 9,564 people · 2019
1/2 SYR4
Monochloroacetic Acid
5.079 µg/L
No EPA limit set
Main supplier: GRINNELL WATER DEPARTMENT · 9,564 people · 2019
1/2 SYR4
Dichloroacetic Acid
4.59 µg/L
No EPA limit set
Main supplier: GRINNELL WATER DEPARTMENT · 9,564 people · 2019
1/2 SYR4
Barium
4.5 µg/L 0.2%
of the EPA limit 2000 µg/L
Main supplier: GRINNELL WATER DEPARTMENT · 9,564 people · 2013
1/2 SYR4
Dibromochloromethane
3.791 µg/L
No EPA limit set
Main supplier: GRINNELL WATER DEPARTMENT · 9,564 people · 2019
1/2 SYR4
Bromoform
3.071 µg/L
No EPA limit set
Main supplier: GRINNELL WATER DEPARTMENT · 9,564 people · 2019
1/2 SYR4
Combined Radium (-226 And -228)
3 pCi/L 60%
of the EPA limit 5 pCi/L
Main supplier: GRINNELL WATER DEPARTMENT · 9,564 people · 2018
1/2 SYR4
Bromodichloromethane
2.457 µg/L
No EPA limit set
Main supplier: GRINNELL WATER DEPARTMENT · 9,564 people · 2019
1/2 SYR4
Dibromoacetic Acid
1.98 µg/L
No EPA limit set
Main supplier: GRINNELL WATER DEPARTMENT · 9,564 people · 2019
1/2 SYR4
Chloroform
1.2725 µg/L
No EPA limit set
Main supplier: GRINNELL WATER DEPARTMENT · 9,564 people · 2019
1/2 SYR4
Trichloroacetic Acid
0.6985 µg/L
No EPA limit set
Main supplier: GRINNELL WATER DEPARTMENT · 9,564 people · 2019
1/2 SYR4
Lead
0.0031 mg/L 21%
of the EPA limit 0.0150 mg/L
Main supplier: GRINNELL WATER DEPARTMENT · 9,564 people · 2025
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 Grinnell

SupplierPopulation served
GRINNELL WATER DEPARTMENT 9,564
GRINNELL MHP MHC 313

Frequently asked questions about Grinnell tap water

Is Grinnell tap water safe to drink?

EPA testing detected 18 contaminants in the water serving Grinnell. 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 Grinnell?

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

What contaminants are in Grinnell's water?

The contaminants EPA monitoring detected in Grinnell include Fluoride, Nitrate, Copper, 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.