(Effective until April 1, 2025)
Installation.
(1) Only installers may construct OSS, except as noted under subsection (2) of this section.
(2) The local health officer may allow the resident owner of a single-family residence not adjacent to a marine shoreline to install the OSS for that single-family residence.
(3) The installer described by either subsection (1) or (2) of this section shall:
(a) Follow the approved design;
(b) Have the approved design in possession during installation;
(c) Make no changes to the approved design without the prior authorization of the designer and the local health officer;
(d) Only install septic tanks, pump chambers, and holding tanks approved by the department;
(e) Be on the site at all times during the excavation and construction of the OSS;
(f) Install the OSS to be watertight, except for the soil dispersal component;
(g) Cover the installation only after the local health officer has given approval to cover; and
(h) Back fill with six to twenty-four inches of cover material and grade the site to prevent surface water from accumulating over any component of the OSS.
[Statutory Authority: RCW
43.20.050. WSR 05-15-119, § 246-272A-0250, filed 7/18/05, effective 7/1/07.]
(Effective April 1, 2025)
Installation.
(1) Only installers may construct OSS, except as noted under subsection (2) of this section.
(2) The local health officer may allow the resident owner of a single-family residence to install the OSS for that single-family residence except when:
(a) The primary and reserve areas are within 200 feet of marine water;
(b) The primary and reserve areas are within 100 feet of surface water; or
(c) The installation permit meets Table X standards in WAC 246-272A-0280.
(3) The installer described by either subsection (1) or (2) of this section shall:
(a) Follow the approved design;
(b) Have the approved design in possession during installation;
(c) Make no changes to the approved design without the prior authorization of the designer and the local health officer;
(d) Only install sewage tanks approved by the department consistent with chapter 246-272C WAC;
(e) Be on the site at all times during the excavation and construction of the OSS;
(f) Install the OSS to be watertight, except for the soil dispersal component;
(g) Cover the installation only after the local health officer has given approval to cover; and
(h) Back fill with six to 24 inches of cover material and grade the site to prevent surface water from accumulating over any component of the OSS.
[Statutory Authority: RCW
43.20.050(3),
43.20.065, chapters
70A.105 and
70A.110 RCW. WSR 24-06-046, § 246-272A-0250, filed 3/1/24, effective 4/1/25. Statutory Authority: RCW
43.20.050. WSR 05-15-119, § 246-272A-0250, filed 7/18/05, effective 7/1/07.]