Tap WaterIndex

← Montana

Tap water quality report

Hidden Lake Colony

EPA monitoring tested this supplier for 72 contaminants and detected 9. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

72
contaminants tested
9
detected
80
people served
62
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Ground water
Ownership
Private
Counties served
Glacier

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.

62
health-based violations
236
violations on file
1
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2017-10-01 → 2017-12-31
MCL Health-based Resolved 2017-10-01 → 2017-12-31
MCL Health-based Resolved 2017-10-01 → 2017-12-31
MCL Health-based Resolved 2017-07-01 → 2017-09-30
MCL Health-based Resolved 2017-07-01 → 2017-09-30
MCL Health-based Resolved 2017-07-01 → 2017-09-30
MCL Health-based Resolved 2017-07-01 → 2017-09-30
MCL Health-based Resolved 2014-07-01 → 2014-09-30
MCL Health-based Resolved 2014-07-01 → 2014-09-30
MCL Health-based Resolved 2014-07-01 → 2014-09-30

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
Nitrate-Nitrite
26235 µg/L 262%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 27000 µg/L
38/38 SYR4 2012–2019
Arsenic
393.4 µg/L 3934%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
worst single sample: 587 µg/L
17/28 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 9/9 LCR 2025
Barium
109.5 µg/L 5.5%
of the EPA limit 2000 µg/L
worst single sample: 110 µg/L
2/4 SYR4 2012–2019
Copper
7.85 µg/L 0.6%
of the EPA limit 1300 µg/L
worst single sample: 8 µg/L
2/25 SYR4 2014–2019
Fluoride
2335 µg/L 58%
of the EPA limit 4000 µg/L
worst single sample: 2400 µg/L
2/3 SYR4 2012–2017
Gross Alpha, Excl. Radon And U
1.585 pCi/L 11%
of the EPA limit 15 pCi/L
worst single sample: 1.6 pCi/L
2/2 SYR4 2019
Selenium
2 µg/L 4%
of the EPA limit 50 µg/L
 2/4 SYR4 2012–2019
Antimony, Total
14 µg/L 233%
of the EPA limit, at the 95th percentile of samples — 6 µg/L
 1/11 SYR4 2012–2019
63 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDibromochloromethaneDichloroacetic AcidDinosebEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidOxamylPentachlorophenolPicloramSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HIDDEN LAKE COLONY INC
Phone
406-336-3695

Frequently asked questions about Hidden Lake Colony

Is Hidden Lake Colony tap water safe to drink?

EPA monitoring detected 9 contaminants in Hidden Lake Colony'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 Hidden Lake Colony's water?

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

How many people does Hidden Lake Colony serve?

Hidden Lake Colony reports serving 80 people in Montana, per its EPA record.

Has Hidden Lake Colony had any water quality violations?

The EPA has 236 violations on file for Hidden Lake Colony, of which 62 are health-based (a contaminant limit or required treatment was breached) and 1 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.