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Tap water quality report

Carpenter Lake Hoa

EPA monitoring tested this supplier for 69 contaminants and detected 9. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

69
contaminants tested
9
detected
65
people served
12
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.

12
health-based violations
51
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2023-09-29
TT Health-based Resolved 2023-09-29
TT Health-based Resolved 2023-09-29
MCL Health-based Resolved 2013-08-01 → 2013-08-31
MCL Health-based Resolved 2013-08-01 → 2013-08-31
MCL Health-based Resolved 2013-08-01 → 2013-08-31
MCL Health-based Resolved 2013-08-01 → 2013-08-31
MCL Health-based Resolved 2013-08-01 → 2013-08-31
MCL Health-based Resolved 2011-04-01 → 2011-04-30
MCL Health-based Resolved 2011-04-01 → 2011-04-30

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
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
 12/12 LCR 2017
Copper
72 µg/L 5.5%
of the EPA limit 1300 µg/L
worst single sample: 80 µg/L
9/10 SYR4 2014–2017
Nitrate-Nitrite
998 µg/L 10%
of the EPA limit 10000 µg/L
worst single sample: 1110 µg/L
9/9 SYR4 2012–2019
Nitrate
430 µg/L 4.3%
of the EPA limit 10000 µg/L
 2/2 SYR4 2013
Barium
320 µg/L 16%
of the EPA limit 2000 µg/L
 1/1 SYR4 2013
Combined Radium (-226 And -228)
1.3 pCi/L 26%
of the EPA limit 5 pCi/L
 1/1 SYR4 2013
Fluoride
70 µg/L 1.8%
of the EPA limit 4000 µg/L
 1/1 SYR4 2013
Gross Alpha, Excl. Radon And U
3.1 pCi/L 21%
of the EPA limit 15 pCi/L
 1/1 SYR4 2013
Lead
2 µg/L 13%
of the EPA limit 15 µg/L
 1/10 SYR4 2014–2017
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, TotalBromodichloromethaneBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
SIMISTER, BRYAN
Phone
406-253-4770
Email
[email protected]

Frequently asked questions about Carpenter Lake Hoa

Is Carpenter Lake Hoa tap water safe to drink?

EPA monitoring detected 9 contaminants in Carpenter Lake Hoa'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 Carpenter Lake Hoa's water?

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

How many people does Carpenter Lake Hoa serve?

Carpenter Lake Hoa reports serving 65 people in Montana, per its EPA record.

Has Carpenter Lake Hoa had any water quality violations?

The EPA has 51 violations on file for Carpenter Lake Hoa, of which 12 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.