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Tap water quality report

West Yellowstone Town of

EPA monitoring tested this supplier for 98 contaminants and detected 13. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

98
contaminants tested
13
detected
9,899
people served
4
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Ground water
Ownership
Local government
Counties served
Gallatin

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.

4
health-based violations
203
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2016-10-17
TT Health-based Resolved 2016-10-17
TT Health-based Resolved 2016-10-17
MCL Health-based Resolved 1995-01-01 → 1995-01-31
MR Monitoring Archived 2021-07-01 → 2021-09-30
MR Monitoring Resolved 2021-04-01 → 2021-06-30
MR Monitoring Resolved 2021-04-01 → 2021-06-30
MR Monitoring Resolved 2021-04-01 → 2021-06-30
MR Monitoring Resolved 2019-08-28
MR Monitoring Resolved 2019-08-28

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Copper
330.2 µg/L 25%
of the EPA limit 1300 µg/L
worst single sample: 638 µg/L
118/120 SYR4 2013–2018
Fluoride
3502.5 µg/L 88%
of the EPA limit 4000 µg/L
worst single sample: 3900 µg/L
84/84 SYR4 2012–2019
Lead
7.545 µg/L 50%
of the EPA limit 15 µg/L
worst single sample: 19.7 µg/L
76/120 SYR4 2013–2018
Nitrate-Nitrite
166.25 µg/L 1.7%
of the EPA limit 10000 µg/L
worst single sample: 179 µg/L
36/36 SYR4 2012–2019
Lead
0.0013 mg/L 8.3%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2024
Arsenic
2.495 µg/L 25%
of the EPA limit 10 µg/L
worst single sample: 2.79 µg/L
11/17 SYR4 2013–2019
Lithium
70 µg/L
No EPA limit set
 6/6 UCMR-5 2024
Barium
1.105 µg/L 0.1%
of the EPA limit 2000 µg/L
worst single sample: 1.11 µg/L
2/4 SYR4 2013–2018
Combined Radium (-226 And -228)
2.67 pCi/L 53%
of the EPA limit 5 pCi/L
worst single sample: 2.8 pCi/L
2/2 SYR4 2013–2017
Antimony, Total
0.3780 µg/L 6.3%
of the EPA limit 6 µg/L
 1/7 SYR4 2013–2018
Gross Alpha, Excl. Radon And U
1.8 pCi/L 12%
of the EPA limit 15 pCi/L
 1/2 SYR4 2013–2017
Mercury
0.0176 µg/L 0.9%
of the EPA limit 2 µg/L
 1/4 SYR4 2013–2018
Selenium
2.59 µg/L 5.2%
of the EPA limit 50 µg/L
 1/4 SYR4 2013–2018
85 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-PF3ONSAdonaAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
BROWN, JON M
Phone
406-646-7795

Frequently asked questions about West Yellowstone Town of

Is West Yellowstone Town of tap water safe to drink?

EPA monitoring detected 13 contaminants in West Yellowstone Town of'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 West Yellowstone Town of's water?

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

How many people does West Yellowstone Town of serve?

West Yellowstone Town of reports serving 9,899 people in Montana, per its EPA record.

Has West Yellowstone Town of had any water quality violations?

The EPA has 203 violations on file for West Yellowstone Town of, of which 4 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.