Accepting comments from December 11, 2025, through January 9, 2026.

The Idaho Department of Environmental Quality (DEQ) seeks comment on the draft Technical Guidance Manual for Individual and Subsurface Sewage Disposal Systems (TGM). 

The manual provides guidance on the design, components, alternates, construction, alteration, repair, operation, and maintenance of standard individual and subsurface sewage systems. This document is updated periodically to adapt to the complex nature of small wastewater disposal systems. 

At the December 2025 Technical Guidance Committee meeting, edits to the following section were preliminarily approved:

The draft materials are available for public review at DEQ’s State Office (1410 N. Hilton Street, Boise, Idaho) and on DEQ’s website. Written comments will be accepted through January 9, 2026, at 5 p.m. Mountain Time. Submit comments using the form below or by mail or email to: 

Peter Adams 
On-Site Wastewater Coordinator 
1410 N. Hilton St. 
Boise, ID 83706 
peter.adams@deq.idaho.gov 

Related Documents 
Technical Guidance Manual for Individual and Subsurface Sewage Disposal Systems

Accessibility Services: The Idaho Department of Environmental Quality will provide reasonable language access services and/or disability services for documents at no charge. To request an accommodation under Title VI of the Civil Rights Act of 1964 or Americans with Disabilities Act, contact DEQ’s nondiscrimination coordinator at (208) 373-0271 or accessibility@deq.idaho.gov. Para obtener información en español, visite https://www.deq.idaho.gov/about-us/accessibility/.