WaterQualityPicWater Quality

Healthy water is essential for healthy living, and protecting this valuable resource is imperative. There are private wells and public water supplies in Gallatin County, and then there’s the water we use while camping and hiking. Each has a different set of guidelines and regulations associated with them.


A Public Water Supply (PWS) is defined as water systems serving 15 or more connections or 25 or more persons daily for 60 or more days in a calendar year. The Montana Department of Environmental Quality (MDEQ) Public Water Supply Program is responsible for assuring that the public health is maintained through a safe and adequate supply of drinking water. This function is achieved by technical review, licensing, certifications, compliance monitoring, training and technical assistance.


Private Water

Public Water

Recreational Water


Water Quality Resources

Montana Department of Environmental Quality (includes Montana water quality information)

Gallatin Local Water Quality District

Water Quality Circulars

Groundwater Discharge Permits

Laws and Rules


Well Drillers Rules (ARM)


More Information

For more information of this and other issues, check out our list of Educational Brochures.

Please contact us with questions at (406) 582-3120 or ehs@gallatin.mt.gov