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: May 2021)
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Public Comment Opportunity
DEQ seeks comment on the draft Technical Guidance Manual for Individual and Subsurface Sewage Disposal Systems
Accepting comments from May 21, 2021, through June 21, 2021.
Current Updates to the Manual
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| Year | Description |
|---|---|
| May 2021 | Section 1.4.2.2.1 Provisional ETPS Approval (1-6 to 1-7) Section 1.4.2.2.2 General ETPS Approval (1-7 to 1-9) Section 1.8 Property Access & Use (Easements) (1-20 to 1-22) Section 4.8.2 ETPS Approval Conditions (4-53 to 4-54) Section 4.23.3.1 Standard In-Trench Sand Filter Design & Construction (4-135) |
| 2021 February | Section 1.4.2.4 Proprietary Wastewater Treatment Product Approval Policy (pp. 1-10) Section 4.19.3.6 Pump to Gravity Distribution (pp. 4-104 to 4-105) |
Previous Updates to the Manual
| Year | Description |
|---|---|
| 2020 November | Section 1.8 Easement (pp. 1-18 to 1-20) Section 4.3.3 Above-Grade Capping Fill System (p. 4-19) |
| 2020 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) |
| 2020 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) | 2019 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) |
| 2019 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) |
| 2019 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) |
| 2019 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) |
| 2019 January | Section 5.14. Updated products list in Table 5-15 (pp. 5-29 to 5-30) |
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Onsite Wastewater Coordinator