Tap WaterIndex

← Montana

Tap water quality report

Miles City City of

EPA monitoring tested this supplier for 95 contaminants and detected 19. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

95
contaminants tested
19
detected
9,565
people served
22
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Surface water
Ownership
Local government
Counties served
Custer

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.

22
health-based violations
80
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Archived 2023-08-01 → 2023-08-31
TT Health-based Archived 2023-08-01 → 2023-08-31
TT Health-based Archived 2023-08-01 → 2023-08-31
TT Health-based Archived 2023-08-01 → 2023-08-31
TT Health-based Archived 2023-08-01 → 2023-08-31
TT Health-based Archived 2023-08-01 → 2023-08-31
TT Health-based Resolved 2022-09-01 → 2022-09-30
TT Health-based Resolved 2022-09-01 → 2022-09-30
TT Health-based Resolved 2022-09-01 → 2022-09-30
TT Health-based Resolved 2022-09-01 → 2022-09-30

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
1100 µg/L 28%
of the EPA limit 4000 µg/L
worst single sample: 1300 µg/L
94/94 SYR4 2012–2019
Bromodichloromethane
15 µg/L
No EPA limit set
worst single sample: 17 µg/L
67/68 SYR4 2012–2019
Chloroform
60.7 µg/L
No EPA limit set
worst single sample: 97 µg/L
67/68 SYR4 2012–2019
TTHM
76.7 µg/L 96%
of the EPA limit 80 µg/L
worst single sample: 117 µg/L
67/68 SYR4 2012–2019
Dibromochloromethane
3.9 µg/L
No EPA limit set
worst single sample: 4.2 µg/L
63/68 SYR4 2012–2019
Dichloroacetic Acid
22.4 µg/L
No EPA limit set
worst single sample: 35 µg/L
59/59 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
50.2 µg/L 84%
of the EPA limit 60 µg/L
worst single sample: 61 µg/L
59/59 SYR4 2012–2019
Trichloroacetic Acid
27.1 µg/L
No EPA limit set
worst single sample: 28 µg/L
59/59 SYR4 2012–2019
Copper
163 µg/L 13%
of the EPA limit 1300 µg/L
worst single sample: 437 µg/L
58/61 SYR4 2013–2019
Dibromoacetic Acid
0.8640 µg/L
No EPA limit set
worst single sample: 1.2 µg/L
37/59 SYR4 2012–2019
Lead
5 µg/L 33%
of the EPA limit 15 µg/L
worst single sample: 12 µg/L
26/60 SYR4 2013–2019
Monochloroacetic Acid
3.58 µg/L
No EPA limit set
worst single sample: 4.6 µg/L
25/59 SYR4 2012–2019
Nitrate-Nitrite
520 µg/L 5.2%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Lead
0.0030 mg/L 20%
of the EPA limit 0.0150 mg/L
 15/15 LCR 2025
Monobromoacetic Acid
1.22 µg/L
No EPA limit set
worst single sample: 1.3 µg/L
9/59 SYR4 2012–2019
Arsenic
5.65 µg/L 57%
of the EPA limit 10 µg/L
worst single sample: 6 µg/L
8/8 SYR4 2012–2019
Lithium
46.4 µg/L
No EPA limit set
 4/4 UCMR-5 2025
Combined Uranium
3 µg/L 10%
of the EPA limit 30 µg/L
 1/1 SYR4 2017
Xylenes, Total
1.5 µg/L 0%
of the EPA limit 10000 µg/L
 1/8 SYR4 2012–2019
76 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-PF3ONSAdonaAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBromoformChlorobenzeneCarbofuranCarbon TetrachlorideChlordaneCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEndrinEthylbenzeneGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneTolueneToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
SPEELMON, THOMAS A
Phone
406-234-1905

Frequently asked questions about Miles City City of

Is Miles City City of tap water safe to drink?

EPA monitoring detected 19 contaminants in Miles City 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 Miles City City of's water?

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

How many people does Miles City City of serve?

Miles City City of reports serving 9,565 people in Montana, per its EPA record.

Has Miles City City of had any water quality violations?

The EPA has 80 violations on file for Miles City City of, of which 22 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.