Is Hilldale Colony Tap Water Safe? Quality Report

Water source: SWP
Ownership: Private
Counties served: Hill

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

152

violations on file

still open

Violation	Type	Status	Period
MR	Monitoring	Resolved	2024-10-01 → 2024-10-31
MR	Monitoring	Resolved	2024-10-01 → 2024-10-31
MR	Monitoring	Resolved	2024-10-01 → 2024-10-31
MR	Monitoring	Resolved	2024-01-01 → 2024-01-31
MR	Monitoring	Resolved	2024-01-01 → 2024-01-31
MR	Monitoring	Resolved	2024-01-01 → 2024-01-31
MR	Monitoring	Resolved	2019-10-01 → 2020-09-30
MR	Monitoring	Resolved	2019-10-01 → 2020-09-30
MR	Monitoring	Resolved	2019-10-01 → 2020-09-30
MR	Monitoring	Resolved	2019-10-01 → 2020-09-30

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Copper	109 µg/L 8.4% of the EPA limit 1300 µg/L	12/12	SYR4	2014–2017
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	8/8	LCR	2017
Dibromochloromethane	17 µg/L No EPA limit set	5/5	SYR4	2013–2019
TTHM	44 µg/L 55% of the EPA limit 80 µg/L	5/5	SYR4	2013–2019
Bromoform	5.1 µg/L No EPA limit set	4/5	SYR4	2013–2019
Total Haloacetic Acids (HAA5)	17.6 µg/L 29% of the EPA limit 60 µg/L	4/4	SYR4	2013–2019
Bromodichloromethane	15 µg/L No EPA limit set	3/5	SYR4	2013–2019
Chloroform	19.1 µg/L No EPA limit set	3/5	SYR4	2013–2019
Dibromoacetic Acid	4.7 µg/L No EPA limit set	3/4	SYR4	2013–2019
Dichloroacetic Acid	11 µg/L No EPA limit set	3/4	SYR4	2013–2019
Trichloroacetic Acid	6.37 µg/L No EPA limit set	3/4	SYR4	2013–2019
Monobromoacetic Acid	0.7900 µg/L No EPA limit set	2/4	SYR4	2013–2019
Monochloroacetic Acid	1.2 µg/L No EPA limit set	2/4	SYR4	2013–2019
Lead	3 µg/L 20% of the EPA limit 15 µg/L	1/12	SYR4	2014–2017

Utility contact

Contact: KLEINSASSER, SAM S
Phone: 406-398-5342
Email: hdplumbing@itstriangle.com

Frequently asked questions about Hilldale Colony

Is Hilldale Colony tap water safe to drink?

EPA monitoring detected 14 contaminants in Hilldale 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 Hilldale Colony's water?

EPA monitoring detected Copper, Lead, Dibromochloromethane, TTHM, Bromoform, and others. The full list with the level and data source for each is above.

How many people does Hilldale Colony serve?

Hilldale Colony reports serving 79 people in Montana, per its EPA record.

Has Hilldale Colony had any water quality violations?

The EPA has 152 violations on file for Hilldale Colony, 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.