Is Malmstrom Air Force Base Tap Water Safe? Quality Report

Water source: SWP
Ownership: Federal government
Counties served: Cascade

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

health-based violations

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2019-01-01 → 2019-03-31
MCL	Health-based	Resolved	2019-01-01 → 2019-03-31
MCL	Health-based	Resolved	2019-01-01 → 2019-03-31
MCL	Health-based	Resolved	2018-10-01 → 2018-12-31
MCL	Health-based	Resolved	2018-10-01 → 2018-12-31
MCL	Health-based	Resolved	2018-10-01 → 2018-12-31
MCL	Health-based	Resolved	2010-04-01 → 2010-06-30
MCL	Health-based	Resolved	2010-04-01 → 2010-06-30
MCL	Health-based	Resolved	2010-04-01 → 2010-06-30
MCL	Health-based	Resolved	2010-04-01 → 2010-06-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).

Contaminant	Max	Detection rate	Period
Pfba	0.0070 µg/L	4/8	2023

Other contaminants detected

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 this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Copper	1482.5 µg/L 114% of the EPA limit, at the 95th percentile of samples — 1300 µg/L worst single sample: 2510 µg/L	216/216	SYR4	2012–2018
TTHM	81 µg/L 101% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 104 µg/L	61/61	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	55 µg/L 92% of the EPA limit 60 µg/L worst single sample: 93 µg/L	61/61	SYR4	2012–2019
Bromodichloromethane	14 µg/L No EPA limit set worst single sample: 15 µg/L	56/56	SYR4	2012–2019
Chloroform	71.5 µg/L No EPA limit set worst single sample: 88 µg/L	56/56	SYR4	2012–2019
Dibromochloromethane	3.125 µg/L No EPA limit set worst single sample: 3.9 µg/L	56/56	SYR4	2012–2019
Dichloroacetic Acid	21.5 µg/L No EPA limit set worst single sample: 35 µg/L	56/56	SYR4	2012–2019
Trichloroacetic Acid	34.5 µg/L No EPA limit set worst single sample: 57 µg/L	55/56	SYR4	2012–2019
Lead	7 µg/L 47% of the EPA limit 15 µg/L worst single sample: 21 µg/L	49/216	SYR4	2012–2018
Dibromoacetic Acid	0.7590 µg/L No EPA limit set worst single sample: 2.2 µg/L	22/56	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	20/20	LCR	2024
Monochloroacetic Acid	1.78 µg/L No EPA limit set worst single sample: 1.9 µg/L	13/56	SYR4	2012–2019
Lithium	68 µg/L No EPA limit set	8/8	UCMR-5	2023
Monobromoacetic Acid	1.454 µg/L No EPA limit set worst single sample: 1.5 µg/L	2/56	SYR4	2012–2019

29 contaminants tested, none detected

11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaBromoformHfpo-DaNetfosaaNfdhaNmefosaaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfuna

Utility contact

Contact: 341ST MEDICAL GROUP OMRS SGXB
Phone: 406-731-1580

Frequently asked questions about Malmstrom Air Force Base

Is Malmstrom Air Force Base tap water safe to drink?

EPA monitoring detected 15 contaminants in Malmstrom Air Force Base's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Malmstrom Air Force Base's water?

EPA monitoring detected Copper, TTHM, Total Haloacetic Acids (HAA5), Bromodichloromethane, Chloroform, and others. The full list with the level and data source for each is above.

How many people does Malmstrom Air Force Base serve?

Malmstrom Air Force Base reports serving 8,850 people in Montana, per its EPA record.

Has Malmstrom Air Force Base had any water quality violations?

The EPA has 82 violations on file for Malmstrom Air Force Base, of which 39 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

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.