Is Carroll, IA Tap Water Safe? Quality & Contaminants

What was found in Carroll'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.

Contaminant	Level vs EPA limit	Suppliers	Source
Fluoride	1100 µg/L 28% of the EPA limit 4000 µg/L Main supplier: CARROLL MUNICIPAL WATER SUPPLY · 10,184 people · 2013	1/1	SYR4
Copper	793.35 µg/L 61% of the EPA limit 1300 µg/L Main supplier: CARROLL MUNICIPAL WATER SUPPLY · 10,184 people · 2017	1/1	SYR4
Nitrite	199 µg/L 20% of the EPA limit 1000 µg/L Main supplier: CARROLL MUNICIPAL WATER SUPPLY · 10,184 people · 2019	1/1	SYR4
Barium	157 µg/L 7.9% of the EPA limit 2000 µg/L Main supplier: CARROLL MUNICIPAL WATER SUPPLY · 10,184 people · 2013	1/1	SYR4
Lithium	53 µg/L No EPA limit set Main supplier: CARROLL MUNICIPAL WATER SUPPLY · 10,184 people · 2025	1/1	UCMR-5
Total Haloacetic Acids (HAA5)	8.391 µg/L 14% of the EPA limit 60 µg/L Main supplier: CARROLL MUNICIPAL WATER SUPPLY · 10,184 people · 2019	1/1	SYR4
Lead	7.34 µg/L 49% of the EPA limit 15 µg/L Main supplier: CARROLL MUNICIPAL WATER SUPPLY · 10,184 people · 2017	1/1	SYR4
Monochloroacetic Acid	5.2715 µg/L No EPA limit set Main supplier: CARROLL MUNICIPAL WATER SUPPLY · 10,184 people · 2019	1/1	SYR4
Dichloroacetic Acid	2.6645 µg/L No EPA limit set Main supplier: CARROLL MUNICIPAL WATER SUPPLY · 10,184 people · 2019	1/1	SYR4
Arsenic	1.79 µg/L 18% of the EPA limit 10 µg/L Main supplier: CARROLL MUNICIPAL WATER SUPPLY · 10,184 people · 2019	1/1	SYR4
Chloroform	1.3775 µg/L No EPA limit set Main supplier: CARROLL MUNICIPAL WATER SUPPLY · 10,184 people · 2019	1/1	SYR4
Combined Radium (-226 And -228)	1.13 pCi/L 23% of the EPA limit 5 pCi/L Main supplier: CARROLL MUNICIPAL WATER SUPPLY · 10,184 people · 2018	1/1	SYR4
Trichloroacetic Acid	0.8320 µg/L No EPA limit set Main supplier: CARROLL MUNICIPAL WATER SUPPLY · 10,184 people · 2019	1/1	SYR4
Lead	0.0080 mg/L 53% of the EPA limit 0.0150 mg/L Main supplier: CARROLL MUNICIPAL WATER SUPPLY · 10,184 people · 2023	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 Carroll

Supplier	Population served
CARROLL MUNICIPAL WATER SUPPLY	10,184

Frequently asked questions about Carroll tap water

Is Carroll tap water safe to drink?

EPA testing detected 14 contaminants in the water serving Carroll. 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 Carroll?

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

What contaminants are in Carroll's water?

The contaminants EPA monitoring detected in Carroll include Fluoride, Copper, Nitrite, Barium, 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.