State of Idaho Department of Environmental Quality Individual and Subsurface Sewage Disposal Systems Technical Guidance

About this manual

This manual provides detailed technical guidance for the design, installation, operation, and maintenance of individual and subsurface sewage disposal systems in Idaho. It covers soil and groundwater evaluation, standard system design, alternative systems, and approved installers and components. The document is intended for professionals and property owners to ensure compliance with state regulations.

The manual includes sections on soil texture, separation guidelines, system types such as drainfields, composting toilets, and sand mounds, as well as requirements for inspections, maintenance, and monitoring. It also addresses property access, managed operation, and system failure protocols.

What's inside

• Soils and Groundwater
• Standard Subsurface Disposal System Design
• Alternative Systems
• Approved Installers, Pumpers, and Components
• Operation and Maintenance
• Inspections and Monitoring
• Property Access and Use
• System Failure and Reinstatement

Frequently asked questions

What is the title of this technical guidance manual?

Technical Guidance Manual Individual and Subsurface Sewage Disposal Systems.

Who prepared this manual?

Idaho Department of Environmental Quality Surface & Wastewater Division.

Where is the manual's main office located?

1410 N. Hilton, Boise, ID 83706.

What is the publication date of this manual?

September 2023.