§ 24.30.230. Wetlands—On-site sewage disposal systems—New.

New on-site sewage disposal systems are subject to all of the following:

A.

New On-Site Sewage Disposal Systems. On-site sewage disposal systems shall be located outside wetlands and their buffers. This may require systems that provide a higher level of sewage treatment. The sewage disposal system shall be located as far from the wetland as possible and have the least adverse impact on water quality and to the wetland and buffer. Also see Article IV, the Rules and Regulations of the Thurston County Board of Health Governing Disposal of Sewage.

B.

Separation from Bogs and Wetlands of High Conservation Value. New on-site sewage disposal systems shall not be allowed within three hundred feet of Category I bogs, wetlands of high conservation value, or wetlands draining to a stream listed by the Washington Department of Ecology under Section 303(d) of the Clean Water Act as impaired for nutrients unless the applicant demonstrates that due to soil conditions, surficial geology, the direction of ground water flow or other relevant factors, the sewage disposal system will not adversely impact the wetland or sensitive plants identified by the Washington Department of Natural Resources Natural Heritage Program. The approval authority shall review the information submitted by the applicant and consult with the Washington Department of Ecology and others with expertise, as needed, prior to allowing the proposed sewage disposal system within three hundred feet of such wetlands. Any approved sewage disposal systems shall be located as far from the wetland as possible.

C.

For lots created prior to the effective date of the ordinance codified in this title that cannot meet the above criteria, refer to Chapter 24.50 TCC.

(Ord. No. 14773, § 3(Att. B), 7-24-2012; Ord. No. 15291, § 1(Att. A), 5-10-2016)