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Tap water quality report

Angel Island Subdivision

EPA monitoring tested this supplier for 57 contaminants and detected 5. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

57
contaminants tested
5
detected
150
people served
0
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Ground water
Ownership
Private
Counties served
Lincoln

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.

0
health-based violations
16
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Resolved 2003-06-01 → 2003-06-30
MR Monitoring Resolved 2003-06-01 → 2003-06-30
MR Monitoring Resolved 2003-06-01 → 2003-06-30
MR Monitoring Resolved 1999-01-01 → 2001-12-31
MR Monitoring Resolved 1999-01-01 → 2001-12-31
MR Monitoring Resolved 1999-01-01 → 2001-12-31
MR Monitoring Resolved 1999-01-01 → 2001-12-31
MR Monitoring Resolved 1996-01-01 → 1996-12-31
MR Monitoring Archived 1981-06-24 → 1981-07-23
MR Monitoring Archived 1981-06-24 → 1981-07-23

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
150 µg/L 1.5%
of the EPA limit 10000 µg/L
 18/18 SYR4 2012–2019
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
 11/11 LCR 2017
Copper
100 µg/L 7.7%
of the EPA limit 1300 µg/L
worst single sample: 120 µg/L
9/10 SYR4 2014–2017
Lead
1 µg/L 6.7%
of the EPA limit 15 µg/L
 4/10 SYR4 2014–2017
Arsenic
3 µg/L 30%
of the EPA limit 10 µg/L
 2/2 SYR4 2016–2017
52 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)PyreneBromodichloromethaneBromoformChlorobenzeneCarbofuranCarbon TetrachlorideChlordaneChloroformCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebEndrinEthylbenzeneGross Alpha, Excl. Radon And UHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorOxamylPentachlorophenolPicloramSimazineStyreneTTHMTetrachloroethyleneTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
ANGEL ISLAND ASSOCIATION
Phone
406-295-5259

Frequently asked questions about Angel Island Subdivision

Is Angel Island Subdivision tap water safe to drink?

EPA monitoring detected 5 contaminants in Angel Island Subdivision'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 Angel Island Subdivision's water?

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

How many people does Angel Island Subdivision serve?

Angel Island Subdivision reports serving 150 people in Montana, per its EPA record.

Has Angel Island Subdivision had any water quality violations?

The EPA has 16 violations on file for Angel Island Subdivision, 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.