Sewage and Septic Information

Please call Environmental Health for possible fees and information regarding the application. 751-8130

• Lookup Permitted Septic Systems
• Environmental Consultants: May 2020
• Permit Application Procedure 2020
• Commerical Evaluation and Septic System Application Updated 6.4.2020
• Residential Evaluation and Septic System Application Updated 6.4.2020
• Deed Restriction for Level 2 Septic System
• Site Reviews for Previously Approved Drainfield and Well Sites
• Septic Fee Schedule Updated 5.1.20
• Flathead County Licensed Septic System Insallers 1.22.2021
• Owner/Self Installed Policy
• Variance Application
• Variance Application Checklist

Activities of this program deal with compliance with the Flathead County Regulations for Sewage Treatment Systems. Permitting, site evaluations and inspection of sewage treatment installations are the primary program activities.

• • Flathead County Regulations for Sewage Treatment Systems (pdf)Updated 2-2016
  • Sewage Treatment System Design and Construction Standards (pdf) Updated 3-2018

• Study Guide for Self Installers
• Site Plan 
• Typical Layout and Setback Distances
• Standard Concrete Septic Tank with Pump & Siphon Chambers 
• Metal Marker for Ends of Pressure Distribution Laterals
• Elevated Sand Mound
• Intermittent Sand Filter

• Ground Water Monitoring Policy
• Ground Water Monitoring Application/Instructions and Measurement Log
• Ground Water Monitoring Downloads

• Your Septic System (pdf)
• Homeowners guide to septic systems(PDF format)
• Homeowner septic system checklist(PDF format)
• EPA’s septic website
• Pump Design Worksheet Excel

1035 1st Ave West
Kalispell, MT 59901 – 2nd Floor

Email: ehealth@flathead.mt.gov

406-751-8130 main line                                 Office Hours
406-751-8131 fax                                            Monday, Tuesday, Thursday, Friday 8 am -5 pm
406-751-8144 air quality line                          Wednesday Closed 8:00am -9:30am Open 9:30am -5 pm