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Tap water quality report

Hardin City of

EPA monitoring tested this supplier for 102 contaminants and detected 21. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

102
contaminants tested
21
detected
3,500
people served
6
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Surface water
Ownership
Local government
Counties served
Big Horn

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.

6
health-based violations
54
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 1995-04-01 → 1995-04-30
TT Health-based Resolved 1995-02-01 → 1995-02-28
TT Health-based Resolved 1994-12-01 → 1994-12-31
TT Health-based Resolved 1994-10-01 → 1994-10-31
TT Health-based Resolved 1994-05-01 → 1994-05-31
TT Health-based Resolved 1994-04-01 → 1994-04-30
MR Monitoring Resolved 2025-04-01 → 2025-06-30
MR Monitoring Resolved 2025-04-01 → 2025-06-30
MR Monitoring Resolved 2025-04-01 → 2025-06-30
MR Monitoring Resolved 2025-04-01 → 2025-06-30

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
Fluoride
600 µg/L 15%
of the EPA limit 4000 µg/L
worst single sample: 1100 µg/L
106/106 SYR4 2012–2019
Copper
135 µg/L 10%
of the EPA limit 1300 µg/L
worst single sample: 421 µg/L
61/62 SYR4 2013–2019
Bromodichloromethane
14.25 µg/L
No EPA limit set
worst single sample: 15 µg/L
36/36 SYR4 2012–2019
Chloroform
36.5 µg/L
No EPA limit set
worst single sample: 59 µg/L
36/36 SYR4 2012–2019
TTHM
49.75 µg/L 62%
of the EPA limit 80 µg/L
worst single sample: 76 µg/L
36/36 SYR4 2012–2019
Dibromochloromethane
4.44 µg/L
No EPA limit set
worst single sample: 5.2 µg/L
34/36 SYR4 2012–2019
Dichloroacetic Acid
18.6 µg/L
No EPA limit set
worst single sample: 23 µg/L
28/28 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
39.25 µg/L 65%
of the EPA limit 60 µg/L
worst single sample: 46 µg/L
28/28 SYR4 2012–2019
Trichloroacetic Acid
21.25 µg/L
No EPA limit set
worst single sample: 28 µg/L
28/28 SYR4 2012–2019
Dibromoacetic Acid
1.1 µg/L
No EPA limit set
 20/28 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 16/16 LCR 2025
Nitrate-Nitrite
470 µg/L 4.7%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Lead
23.5 µg/L 157%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 56 µg/L
14/62 SYR4 2013–2019
Monochloroacetic Acid
2.6 µg/L
No EPA limit set
worst single sample: 3.4 µg/L
9/28 SYR4 2012–2019
Arsenic
1 µg/L 10%
of the EPA limit 10 µg/L
 4/8 SYR4 2012–2019
Lithium
33 µg/L
No EPA limit set
 4/4 UCMR-5 2024
Chromium
6 µg/L 6%
of the EPA limit 100 µg/L
 1/1 SYR4 2018
Combined Uranium
2 µg/L 6.7%
of the EPA limit 30 µg/L
 1/1 SYR4 2017
Gross Alpha, Excl. Radon And U
2.4 pCi/L 16%
of the EPA limit 15 pCi/L
 1/1 SYR4 2017
Monobromoacetic Acid
0.6000 µg/L
No EPA limit set
 1/28 SYR4 2012–2019
Selenium
2 µg/L 4%
of the EPA limit 50 µg/L
 1/1 SYR4 2018
81 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HURFF JR, MICHAEL D
Phone
406-665-9260
Email
[email protected]

Frequently asked questions about Hardin City of

Is Hardin City of tap water safe to drink?

EPA monitoring detected 21 contaminants in Hardin City of'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 City of's water?

EPA monitoring detected Fluoride, Copper, Bromodichloromethane, Chloroform, TTHM, and others. The full list with the level and data source for each is above.

How many people does Hardin City of serve?

Hardin City of reports serving 3,500 people in Montana, per its EPA record.

Has Hardin City of had any water quality violations?

The EPA has 54 violations on file for Hardin City of, of which 6 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.