Is Mandan, ND Tap Water Safe? Quality & Contaminants

What was found in Mandan'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	740 µg/L 19% of the EPA limit 4000 µg/L Main supplier: MANDAN CITY OF · 21,769 people · 2016	1/4	SYR4
Nitrate-Nitrite	140 µg/L 1.4% of the EPA limit 10000 µg/L Main supplier: MANDAN CITY OF · 21,769 people · 2019	1/4	SYR4
Copper	26.5 µg/L 2% of the EPA limit 1300 µg/L Main supplier: MANDAN CITY OF · 21,769 people · 2017 Highest in the city: 81.77 µg/L — MISSOURI WEST WATER SYSTEM · 4,303 people · 2018	4/4	SYR4
TTHM	67.178 µg/L 84% of the EPA limit 80 µg/L Main supplier: MANDAN CITY OF · 21,769 people · 2019	4/4	SYR4
Chloroform	45.522 µg/L No EPA limit set Main supplier: MANDAN CITY OF · 21,769 people · 2019	4/4	SYR4
Lithium	45.5 µg/L No EPA limit set Main supplier: MANDAN CITY OF · 21,769 people · 2024	2/4	UCMR-5
Total Haloacetic Acids (HAA5)	20.706 µg/L 35% of the EPA limit 60 µg/L Main supplier: MANDAN CITY OF · 21,769 people · 2019 Highest in the city: 22.1175 µg/L — RIVERVIEW HEIGHTS · 200 people · 2019	4/4	SYR4
Dichloroacetic Acid	13.7 µg/L No EPA limit set Main supplier: MANDAN CITY OF · 21,769 people · 2019 Highest in the city: 17.375 µg/L — RIVERVIEW HEIGHTS · 200 people · 2019	4/4	SYR4
Bromodichloromethane	14.616 µg/L No EPA limit set Main supplier: MANDAN CITY OF · 21,769 people · 2019	4/4	SYR4
Barium	11.1 µg/L 0.6% of the EPA limit 2000 µg/L Main supplier: MANDAN CITY OF · 21,769 people · 2016	1/4	SYR4
Lead	9.685 µg/L 65% of the EPA limit 15 µg/L Main supplier: MANDAN CITY OF · 21,769 people · 2017	4/4	SYR4
Trichloroacetic Acid	5.584 µg/L No EPA limit set Main supplier: MANDAN CITY OF · 21,769 people · 2019	4/4	SYR4
Dibromochloromethane	4.791 µg/L No EPA limit set Main supplier: MANDAN CITY OF · 21,769 people · 2019	4/4	SYR4
Gross Alpha, Excl. Radon And U	2.91 pCi/L 19% of the EPA limit 15 pCi/L Main supplier: MANDAN CITY OF · 21,769 people · 2018	1/4	SYR4
Monochloroacetic Acid	2.165 µg/L No EPA limit set Main supplier: MANDAN CITY OF · 21,769 people · 2019 Highest in the city: 2.6485 µg/L — MISSOURI WEST WATER SYSTEM · 4,303 people · 2019	4/4	SYR4
Dibromoacetic Acid	2.078 µg/L No EPA limit set Main supplier: MANDAN CITY OF · 21,769 people · 2019	4/4	SYR4
Combined Uranium	1.2135 µg/L 4% of the EPA limit 30 µg/L Main supplier: MANDAN CITY OF · 21,769 people · 2018	1/4	SYR4
Combined Radium (-226 And -228)	0.0696 pCi/L 1.4% of the EPA limit 5 pCi/L Main supplier: MANDAN CITY OF · 21,769 people · 2018	1/4	SYR4
Lead	0.0062 mg/L 41% of the EPA limit 0.0150 mg/L Main supplier: MANDAN CITY OF · 21,769 people · 2023	4/4	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 Mandan

Supplier	Population served
MANDAN CITY OF	21,769
MISSOURI WEST WATER SYSTEM	4,303
CROWN BUTTE COOP	320
RIVERVIEW HEIGHTS	200

Frequently asked questions about Mandan tap water

Is Mandan tap water safe to drink?

EPA testing detected 19 contaminants in the water serving Mandan. 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 Mandan?

4 public water suppliers report drinking-water monitoring for Mandan, North Dakota to the EPA. Each is listed above with its population served.

What contaminants are in Mandan's water?

The contaminants EPA monitoring detected in Mandan include Fluoride, Nitrate-Nitrite, Copper, TTHM, Chloroform. 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.