The Technical Guidance Committee (TGC) is responsible for maintaining the Technical Guidance Manual, reviewing best management practices for individual and subsurface sewage disposal, and providing recommendations on variances and commercially manufactured wastewater treatment components and systems. The TGC comprises six members: one DEQ representative (chair), three health district representatives, one State of Idaho-licensed professional engineer, and one licensed installer. TGC meetings occur quarterly unless, a special issue warrants a special meeting.
The Technical Guidance Manual provides guidance on the design, construction, alteration, repair, operation, and maintenance of standard individual and subsurface sewage systems, their components, and alternatives. The manual is updated periodically to adapt to the dynamic and complex nature of small wastewater disposal systems. Updates are cited below.
- Technical Guidance Manual for Individual and Subsurface Sewage Disposal Systems (Last updated: March 16, 2023)
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Current Updates to the Manual
|March 2023||Section 5.2 Approved Septic Tanks
Section 5.4 Extended Treatment Package Systems
Section 5.13 Proprietary Wastewater Treatment Products
Section 4.3.5 Capping Fill System Construction
Previous Updates to the Manual
|December 2022||Section 4.2 At-Grade Soil Absorption System|
Section 4.3 Capping Fill System
Section 4.24 Sand Mound
Section 188.8.131.52.1 Initial Septic Tank Approvals
Section 184.108.40.206 Gravelless Product Approvals
Section 220.127.116.11 Reduction to Separation Distance to Surface Water without a Variance
|June 2022||Section 4.20 Recreational Vehicle Dump Station|
Section 2.1.2 Soil Design Groups and Subgroups
Section 4.12 Grey Water Sump
Section 4.15 Wastewater Incinerator
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Onsite Wastewater Coordinator