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Tap water quality report

Sphinx Mountain Mb Hm Pk

EPA monitoring tested this supplier for 65 contaminants and detected 12. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

65
contaminants tested
12
detected
52
people served
38
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Ground water
Ownership
Private
Counties served
Park

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.

38
health-based violations
101
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 2010-07-01 → 2010-09-30
MCL Health-based Archived 2010-07-01 → 2010-09-30
MCL Health-based Archived 2010-07-01 → 2010-09-30
MCL Health-based Archived 2010-07-01 → 2010-09-30
MCL Health-based Archived 2010-07-01 → 2010-09-30
MCL Health-based Archived 2010-04-01 → 2010-06-30
MCL Health-based Archived 2010-04-01 → 2010-06-30
MCL Health-based Archived 2010-04-01 → 2010-06-30
MCL Health-based Archived 2010-04-01 → 2010-06-30
MCL Health-based Archived 2010-04-01 → 2010-06-30

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2024
Arsenic
8 µg/L 80%
of the EPA limit 10 µg/L
 9/9 SYR4 2012–2019
Copper
60.6 µg/L 4.7%
of the EPA limit 1300 µg/L
worst single sample: 76 µg/L
8/15 SYR4 2012–2018
Combined Uranium
17.7 µg/L 59%
of the EPA limit 30 µg/L
worst single sample: 18 µg/L
7/7 SYR4 2012–2017
Nitrate-Nitrite
30 µg/L 0.3%
of the EPA limit 10000 µg/L
 6/18 SYR4 2012–2019
Gross Alpha, Excl. Radon And U
12.145 pCi/L 81%
of the EPA limit 15 pCi/L
worst single sample: 13 pCi/L
4/7 SYR4 2012–2017
Barium
90 µg/L 4.5%
of the EPA limit 2000 µg/L
 3/3 SYR4 2012–2019
Fluoride
980 µg/L 25%
of the EPA limit 4000 µg/L
worst single sample: 1000 µg/L
3/3 SYR4 2012–2019
Mercury
0.1000 µg/L 5%
of the EPA limit 2 µg/L
 2/3 SYR4 2012–2019
Chromium
9 µg/L 9%
of the EPA limit 100 µg/L
 1/3 SYR4 2012–2019
Lead
1 µg/L 6.7%
of the EPA limit 15 µg/L
 1/15 SYR4 2012–2018
Toluene
0.8200 µg/L 0.1%
of the EPA limit 1000 µg/L
 1/3 SYR4 2012–2019
53 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
BROZOVSKY, NEWMAN V
Phone
406-848-9200
Email
[email protected]

Frequently asked questions about Sphinx Mountain Mb Hm Pk

Is Sphinx Mountain Mb Hm Pk tap water safe to drink?

EPA monitoring detected 12 contaminants in Sphinx Mountain Mb Hm Pk'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 Sphinx Mountain Mb Hm Pk's water?

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

How many people does Sphinx Mountain Mb Hm Pk serve?

Sphinx Mountain Mb Hm Pk reports serving 52 people in Montana, per its EPA record.

Has Sphinx Mountain Mb Hm Pk had any water quality violations?

The EPA has 101 violations on file for Sphinx Mountain Mb Hm Pk, of which 38 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.