Water Quality: Lewistown, MT
4 water systems • 6,078 people served
Multiple Health ViolationsWater Quality Summary
Lewistown is served by 4 public water systems with a combined service population of 6,078 people, and has 239 EPA Safe Drinking Water Act violations on record. Critically, 38 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Lewistown's violation count is 128% above the national average for Montana. Contaminants associated with violations include Gross Alpha, Nitrate-Nitrite.
Contaminants Found
Alpha-emitting radioactive particles increase cancer risk, particularly from bone and other internal cancers.
Common source: Natural uranium and radium in geological formations
EPA limit: 15 pCi/L (excluding radon and uranium)
Causes methemoglobinemia in infants and may pose cancer risks with long-term exposure.
Common source: Fertilizer runoff, septic systems, animal feedlots, natural deposits
EPA limit: 10 mg/L (as nitrogen)
Water Systems Serving Lewistown
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| LEWISTOWN CITY OF | MT0000271 | Groundwater | 5,923 | 64 |
| KING RANCH COLONY | MT0000432 | Groundwater | 56 | 106 |
| DEERFIELD HUTTERITE COLONY | MT0000431 | Groundwater | 51 | 63 |
| SPRING CREEK COLONY LEWISTOWN | MT0000433 | Groundwater | 48 | 6 |
Concerned About Your Water?
A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.
Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.
Other Cities in Montana
Data Sources
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.