Is Missoula Water Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: Missoula

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
MR	Monitoring	Resolved	2017-04-01 → 2017-06-30
MR	Monitoring	Resolved	2017-04-01 → 2017-06-30
MR	Monitoring	Resolved	2017-04-01 → 2017-06-30
MR	Monitoring	Resolved	2017-04-01 → 2017-06-30
MR	Monitoring	Resolved	2017-04-01 → 2017-06-30
MR	Monitoring	Resolved	2017-04-01 → 2017-06-30
MR	Monitoring	Resolved	2017-04-01 → 2017-06-30
MR	Monitoring	Resolved	2017-04-01 → 2017-06-30
MR	Monitoring	Resolved	2017-04-01 → 2017-06-30
MR	Monitoring	Resolved	2017-04-01 → 2017-06-30

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
Nitrate-Nitrite	1730 µg/L 17% of the EPA limit 10000 µg/L worst single sample: 3450 µg/L	564/564	SYR4	2012–2019
Copper	318 µg/L 24% of the EPA limit 1300 µg/L worst single sample: 1200 µg/L	261/347	SYR4	2012–2019
Arsenic	3 µg/L 30% of the EPA limit 10 µg/L worst single sample: 4 µg/L	183/267	SYR4	2012–2019
Lead	5 µg/L 33% of the EPA limit 15 µg/L worst single sample: 14 µg/L	135/352	SYR4	2012–2019
Barium	456 µg/L 23% of the EPA limit 2000 µg/L worst single sample: 570 µg/L	93/93	SYR4	2012–2019
Fluoride	200 µg/L 5% of the EPA limit 4000 µg/L worst single sample: 1000 µg/L	82/93	SYR4	2012–2019
TTHM	9.7 µg/L 12% of the EPA limit 80 µg/L worst single sample: 9.9 µg/L	55/150	SYR4	2012–2019
Combined Uranium	2 µg/L 6.7% of the EPA limit 30 µg/L	46/53	SYR4	2014–2019
Dibromoacetic Acid	1.085 µg/L No EPA limit set worst single sample: 1.3 µg/L	44/44	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	1.085 µg/L 1.8% of the EPA limit 60 µg/L worst single sample: 1.3 µg/L	44/44	SYR4	2012–2019
Dibromochloromethane	3.7 µg/L No EPA limit set worst single sample: 4 µg/L	43/150	SYR4	2012–2019
Bromodichloromethane	2.2 µg/L No EPA limit set	37/150	SYR4	2012–2019
Combined Radium (-226 And -228)	2.635 pCi/L 53% of the EPA limit 5 pCi/L worst single sample: 3.9 pCi/L	32/55	SYR4	2013–2019
Gross Alpha, Excl. Radon And U	4.99 pCi/L 33% of the EPA limit 15 pCi/L worst single sample: 5.4 pCi/L	32/53	SYR4	2014–2019
Bromoform	2.5 µg/L No EPA limit set worst single sample: 4.2 µg/L	27/150	SYR4	2012–2019
Chloroform	1.137 µg/L No EPA limit set worst single sample: 1.3 µg/L	27/150	SYR4	2012–2019
Lead	0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L	19/19	LCR	2026
Lithium	15 µg/L No EPA limit set	6/45	UCMR-5	2025
Gross Beta Particle Activity	9.74 pCi/L No EPA limit set worst single sample: 11 pCi/L	4/9	SYR4	2018
Dichloromethane	1.9 µg/L 38% of the EPA limit 5 µg/L	3/109	SYR4	2012–2019
Di(2-ethylhexyl) Phthalate	4.6 µg/L 77% of the EPA limit 6 µg/L	1/110	SYR4	2012–2019
Nitrite	10 µg/L 1% of the EPA limit 1000 µg/L	1/90	SYR4	2012–2019
Selenium	1 µg/L 2% of the EPA limit 50 µg/L	1/93	SYR4	2012–2019
Tetrachloroethylene	0.2600 µg/L 5.2% of the EPA limit 5 µg/L	1/110	SYR4	2012–2019

81 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDalaponDi(2-ethylhexyl) AdipateDichloroacetic AcidDinosebEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: HENEHAN, MIKE
Phone: 406-552-6700
Email: [email protected]

Frequently asked questions about Missoula Water

Is Missoula Water tap water safe to drink?

EPA monitoring detected 24 contaminants in Missoula Water'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 Missoula Water's water?

EPA monitoring detected Nitrate-Nitrite, Copper, Arsenic, Lead, Barium, and others. The full list with the level and data source for each is above.

How many people does Missoula Water serve?

Missoula Water reports serving 68,200 people in Montana, per its EPA record.

Has Missoula Water had any water quality violations?

The EPA has 83 violations on file for Missoula Water, of which 0 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.