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Septic Technical Guidance Committee

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.

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Current Updates to the Manual

Year Description
May Section 3.2.8.1.2 Medium Sand (p. 3-17)
Section 1.4.2.2.1 Provisional ETPS Approval (pp. 1-6 to 1-7)
Section 4.8.2 Extended Treatment Package System Approval Conditions (pp. 4-53 to 4-56)
Section 4.13 Gray Water System (pp. 4-71 to 4-77)
August Section 1.5.1 Installer’s Registration Permit and Service
Provider Certification Application, Bond, Fee, Training, and Exam (pp. 1-10 to 1-11)
Section 4.19.3.2 Pressurization Unit (pp. 4-95 to 4-96)
November Section 1.8 Easement (pp. 1-18 to 1-20)
Section 4.3.3 Above-Grade Capping Fill System (p. 4-19)

Previous Updates to the Manual

Year Description
December Section 1.4.2.1.1 Initial Septic Tank Approvals (p. 1-4)
Section 3.2.3 Septic Tank and Dosing Chamber Installation (p. 3-6)
Section 5.8 Septic Tank Effluent Filters, Table 5-12 (p. 5-23)
October Section 4.23.3.2.1 Standard Enveloped In-Trench Filter Design and Construction. Figure 4-39. (p. 4-136)
Section 4.23.3.2.2. Pretreated Enveloped In-Trench Sand Filter Design and Construction. Figure 4-40. (p. 4-137)
Section 4.23.3.2.3. Pressurized Enveloped In-Trench Sand Filter Design and Construction. Figure 4.41. (p. 4-138)
Section 5.2. Approved Septic Tanks. Table 5-1. (p. 5-2)
Section 5.11. Drainfield Remediation Components. Table 5-15. (p. 5-27)
Section 5.13. Proprietary Wastewater Treatment Products. Table 5-17. (pp.5-29–5-30)
July Section 2.2.5. Method of 72 to Determine Effective Soil Depths (pp. 5-17 to 5-19)
Section 4.23. In-Trench Sand Filter (pp. 4-133 to 4-138)
Section 5.2. Approved Septic Tanks, Table 5-1 (pp. 5-2 to 5-11)
Section 5.4. Extended Treatment Package Systems, Table 5-3 (pp. 5-13 to 5-15
Section 5.5. Approved Nondischarging Products, Table 5-5 (p. 5-17)
March Section 1.9.5. Property Owner Operation, Maintenance, or Monitoring Requirements (pp. 1-31 and 1-32)
Section 4.24.3.1. Sand Mound Absorption Bed Cell Design (p. 4-141)
Section 5.2. Approved Septic Tanks, Table 5-1 (pp. 5-2 to 5-10)
Section 5.5. Approved Nondischarging Products, Tables 5-5 to 5-8 (pp. 5-17 to 5-19)
Section 5.13. Proprietary Wastewater Treatment Products, Table 5-13 (pp. 5-29 and 5-30)
January Section 5.14. Updated products list in Table 5-15 (pp. 5-29 to 5-30)

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Onsite Wastewater Coordinator

Peter Adams
peter.adams@deq.idaho.gov
(208) 373-0464

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