Septic Tank Inspectors in Montana

Cities in Montana

Montana Septic Regulations

Montana septic systems are regulated by the Department of Environmental Quality (DEQ) and local county health departments under the Subsurface Wastewater Treatment rules (ARM 17.36). Permits are required for the installation, alteration, and repair of subsurface wastewater treatment systems, and site evaluations are mandatory before approval.

• Subsurface wastewater permits are issued by DEQ or the local county health department and require a site evaluation and soil analysis.
• Montana requires licensed installers for subsurface wastewater treatment system installation and major repairs.
• DEQ rules establish minimum setback distances from wells, surface waters, and property lines for all subsurface systems.
• Montana does not mandate a statewide time-of-transfer septic inspection, though lenders and some counties may require one.
• Systems must be designed to meet DEQ standards based on site and soil conditions, including percolation test results and vertical separation to groundwater or bedrock.
• DEQ and county health departments maintain records of permitted systems — contact the local office for records before purchasing property.

Source: Montana Department of Environmental Quality (DEQ) / Local County Health