Is St Mary Headquarters and Cg Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Federal government
Counties served: Glacier

Compliance record

No violations on file. The EPA has no formal drinking-water violations recorded for this supplier.

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
Copper	528.5 µg/L 41% of the EPA limit 1300 µg/L worst single sample: 810 µg/L	30/30	SYR4	2018–2019
Lead	11 µg/L 73% of the EPA limit 15 µg/L worst single sample: 17 µg/L	16/30	SYR4	2018–2019
Nitrate-Nitrite	151 µg/L 1.5% of the EPA limit 10000 µg/L worst single sample: 160 µg/L	10/10	SYR4	2012–2019
Bromodichloromethane	1.0685 µg/L No EPA limit set worst single sample: 1.1 µg/L	4/6	SYR4	2018–2019
Chloroform	5.515 µg/L No EPA limit set worst single sample: 6.1 µg/L	4/6	SYR4	2018–2019
Dichloroacetic Acid	2.25 µg/L No EPA limit set worst single sample: 2.4 µg/L	4/4	SYR4	2018–2019
TTHM	6.615 µg/L 8.3% of the EPA limit 80 µg/L worst single sample: 7.2 µg/L	4/6	SYR4	2018–2019
Total Haloacetic Acids (HAA5)	4.07 µg/L 6.8% of the EPA limit 60 µg/L worst single sample: 4.4 µg/L	4/4	SYR4	2018–2019
Trichloroacetic Acid	1.8065 µg/L No EPA limit set worst single sample: 2 µg/L	4/4	SYR4	2018–2019
Lead	0.0100 mg/L 67% of the EPA limit 0.0150 mg/L	3/3	LCR	2024
Gross Alpha, Excl. Radon And U	3.22 pCi/L 21% of the EPA limit 15 pCi/L worst single sample: 3.3 pCi/L	2/3	SYR4	2018–2019
Nitrate	160 µg/L 1.6% of the EPA limit 10000 µg/L	2/2	SYR4	2018
Barium	160 µg/L 8% of the EPA limit 2000 µg/L	1/1	SYR4	2018
Combined Uranium	0.3000 µg/L 1% of the EPA limit 30 µg/L	1/3	SYR4	2018–2019
Fluoride	30 µg/L 0.8% of the EPA limit 4000 µg/L	1/1	SYR4	2018

60 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, TotalArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDibromochloromethaneDinosebEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: FOSTER PE, JAMES E
Phone: 406-270-5146
Email: [email protected]

Frequently asked questions about St Mary Headquarters and Cg

Is St Mary Headquarters and Cg tap water safe to drink?

EPA monitoring detected 15 contaminants in St Mary Headquarters and Cg'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 St Mary Headquarters and Cg's water?

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

How many people does St Mary Headquarters and Cg serve?

St Mary Headquarters and Cg reports serving 1,030 people in Montana, per its EPA record.

Has St Mary Headquarters and Cg had any water quality violations?

The EPA has no formal drinking-water violations on file for St Mary Headquarters and Cg.

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.