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Tap water quality report

Hardin Subdivision

EPA monitoring tested this supplier for 66 contaminants and detected 7. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

66
contaminants tested
7
detected
28
people served
5
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Ground water
Ownership
Private
Counties served
Gallatin

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.

5
health-based violations
112
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2015-07-01 → 2015-07-31
MCL Health-based Resolved 2015-07-01 → 2015-07-31
MCL Health-based Resolved 2015-07-01 → 2015-07-31
MCL Health-based Resolved 2015-07-01 → 2015-07-31
MCL Health-based Resolved 2015-07-01 → 2015-07-31
MR Monitoring Resolved 2015-07-22
MR Monitoring Resolved 2015-07-22
MR Monitoring Resolved 2015-07-22
MR Monitoring Resolved 2007-01-01
MR Monitoring Resolved 2007-01-01

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate-Nitrite
3250 µg/L 33%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Copper
380 µg/L 29%
of the EPA limit 1300 µg/L
 15/15 SYR4 2013–2019
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
 9/9 LCR 2025
Fluoride
200 µg/L 5%
of the EPA limit 4000 µg/L
 2/2 SYR4 2014–2017
Combined Radium (-226 And -228)
0.7000 pCi/L 14%
of the EPA limit 5 pCi/L
 1/1 SYR4 2015
Gross Alpha, Excl. Radon And U
3.6 pCi/L 24%
of the EPA limit 15 pCi/L
 1/1 SYR4 2015
Lead
4 µg/L 27%
of the EPA limit 15 µg/L
 1/15 SYR4 2013–2019
59 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, TotalArsenicAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
PAILTHORPE, DIANA
Phone
406-579-7851

Frequently asked questions about Hardin Subdivision

Is Hardin Subdivision tap water safe to drink?

EPA monitoring detected 7 contaminants in Hardin 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 Hardin Subdivision's water?

EPA monitoring detected Nitrate-Nitrite, Copper, Lead, Fluoride, Combined Radium (-226 And -228), and others. The full list with the level and data source for each is above.

How many people does Hardin Subdivision serve?

Hardin Subdivision reports serving 28 people in Montana, per its EPA record.

Has Hardin Subdivision had any water quality violations?

The EPA has 112 violations on file for Hardin Subdivision, of which 5 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.