Is Allison, IA Tap Water Safe? Quality & Contaminants

What was found in Allison'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
Nitrate	4000 µg/L 40% of the EPA limit 10000 µg/L Main supplier: ALLISON WATER SUPPLY · 966 people · 2019	1/1	SYR4
Fluoride	1100 µg/L 28% of the EPA limit 4000 µg/L Main supplier: ALLISON WATER SUPPLY · 966 people · 2019	1/1	SYR4
Barium	246 µg/L 12% of the EPA limit 2000 µg/L Main supplier: ALLISON WATER SUPPLY · 966 people · 2012	1/1	SYR4
Copper	126 µg/L 9.7% of the EPA limit 1300 µg/L Main supplier: ALLISON WATER SUPPLY · 966 people · 2018	1/1	SYR4
TTHM	25.16 µg/L 31% of the EPA limit 80 µg/L Main supplier: ALLISON WATER SUPPLY · 966 people · 2019	1/1	SYR4
Chloroform	20.925 µg/L No EPA limit set Main supplier: ALLISON WATER SUPPLY · 966 people · 2019	1/1	SYR4
Total Haloacetic Acids (HAA5)	19.165 µg/L 32% of the EPA limit 60 µg/L Main supplier: ALLISON WATER SUPPLY · 966 people · 2019	1/1	SYR4
Lead	15.58 µg/L 104% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: ALLISON WATER SUPPLY · 966 people · 2018	1/1	SYR4
Dichloroacetic Acid	7.695 µg/L No EPA limit set Main supplier: ALLISON WATER SUPPLY · 966 people · 2019	1/1	SYR4
Monochloroacetic Acid	6.7325 µg/L No EPA limit set Main supplier: ALLISON WATER SUPPLY · 966 people · 2019	1/1	SYR4
Trichloroacetic Acid	5.023 µg/L No EPA limit set Main supplier: ALLISON WATER SUPPLY · 966 people · 2019	1/1	SYR4
Bromodichloromethane	3.256 µg/L No EPA limit set Main supplier: ALLISON WATER SUPPLY · 966 people · 2019	1/1	SYR4
Dibromochloromethane	2.5245 µg/L No EPA limit set Main supplier: ALLISON WATER SUPPLY · 966 people · 2019	1/1	SYR4
Lead	0.0076 mg/L 51% of the EPA limit 0.0150 mg/L Main supplier: ALLISON WATER SUPPLY · 966 people · 2024	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 Allison

Supplier	Population served
ALLISON WATER SUPPLY	966

Frequently asked questions about Allison tap water

Is Allison tap water safe to drink?

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

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

What contaminants are in Allison's water?

The contaminants EPA monitoring detected in Allison include Nitrate, Fluoride, Barium, Copper, TTHM. 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.