Drinking Water Systems in SHELBY, Montana
6 water systems are reported for this city, with a combined service population of 4,790. The systems have 11 EPA violation records in the five-year period ending June 30, 2026.
Water Systems Serving SHELBY
NCMRWA NORTH SHELBY
300 served0 historical records
A
ETHRIDGE COUNTY WATER DISTRICT
70 served0 historical records
A
OILMONT COUNTY WATER DISTRICT
300 served115 historical records3 recent
C
BIG ROSE COLONY
75 served0 historical records
A
DEVON WATER INC
75 served267 historical records7 recent
C
SHELBY CITY OF
3,970 served22 historical records1 recent
B
EPA Contaminant Categories in Historical Violation Records
Coliform (TCR)40 records
Lead and Copper Rule18 records
Haloacetic Acids (HAA5)17 records
Total Trihalomethanes (TTHMs)16 records
Consumer Confidence Rule16 records
Groundwater Rule13 records
Xylenes, Total11 records
Vinyl chloride11 records
Chloramine11 records
1,1,2-Trichloroethane11 records
Category counts aggregate historical compliance records across listed systems. They do not show current concentrations or household test results.