Lewis and Clark County Water Quality

Lewis and Clark County, Montana has a water quality grade of F with a score of 26.1/100, based on EPA Safe Drinking Water Information System data. The county has 40 health-based drinking water violations on record.

Lewis and Clark County has 40 health-based drinking water violations recorded by the EPA. Health-based violations indicate instances where contaminant levels exceeded EPA Maximum Contaminant Levels (MCLs). Violations may have been resolved — check with your local water utility for current status.

Lewis and Clark County's water quality score of 26.1/100 is lower than the Montana state average of 48.9. The average water quality grade across Montana is D, based on data from 55 counties with available water quality data.

Based on EPA data, Lewis and Clark County has a water quality grade of F (26.1/100). This indicates below-average water quality with significant compliance issues. Residents may want to consider home water filtration. For the most up-to-date information, contact your local water utility or review your Consumer Confidence Report (CCR).

Lewis and Clark County has 40 health-based drinking water violations on record from the EPA SDWIS database. A higher violation count can result from aging infrastructure, underfunded water utilities, agricultural runoff contamination, or industrial pollution. Counties with more water systems may also see more violations simply due to scale. Residents concerned about water quality should consider independent water testing and home filtration systems.

Lewis and Clark County ranks #39 out of 55 counties in Montana by water quality score (1 = best). With a score of 26.1/100, it falls in the bottom third of counties statewide. Rankings are based on EPA Safe Drinking Water Information System (SDWIS) data including health-based violations and compliance records.