Sewage and Septic Information
Commercial and Residential Septic System Applications
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 Installers 5.29.2020
- Owner/Self Installed Policy
- Variance Application
- Variance Application Checklist
Sewage Treatment System Services
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.
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- Flathead County Regulations for Sewage Treatment Systems (pdf)Updated 2-2016
- Sewage Treatment System Design and Construction Standards (pdf) Updated 3-2018
Example Drawings of On-Site Treatment System Elements
Ground Water Monitoring Information
Helpful Septic and Sewage Links
- 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
Environmental Health Services Contact Info
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