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(1) All development proposals, including but not limited to multifamily and single-family development proposals, commercial site plans, subdivisions and short subdivisions within the City shall be served by public sewer facilities.

(2) Exemptions from Connecting to a Public Sewer System. The following are exempt from providing a sewer connection as follows. An exemption does not eliminate the requirement for the applicant to obtain approval from other agencies with jurisdiction.

(a) Nonresidential developments that are located more than 300 feet from public sewer may be approved without connection to the public sewer system provided the following criteria are met prior to the issuance of the underlying land use decision associated with the development type:

(i) The applicant has received approval for an on-site sewage system design from Public Health – Seattle & King County (PHSKC) in accordance with the codes of the King County Board of Health. Any approval and preliminary design for an on-site sewage system shall be submitted with the underlying land use application in accordance with the City’s application completeness requirements; and

(ii) Proposed on-site sewage systems shall be located on the same lot as the buildings they are designed to serve. An off-site sewage system may be considered if an easement is obtained and recorded against the subject properties and if the off-site system is designed in accordance with the determination of the King County Board of Health and PHSKC; and

(iii) The applicant shall provide the City a certificate of future connection from the sewer district that certifies that an irrevocable agreement has been entered into with the sewer district requiring that the property shall be connected to public sewers upon availability of such sewers and that the property owner shall pay all costs of connection to the sewer and report the septic tank abandonment to the health officer on a form obtained from the PHSKC to the City and the PHSKC. The certificate of future connection shall stipulate that the applicant and the applicant’s successors in interest agree to participate in and not protest the formation of a utility local improvement district or local improvement district or sewer district project that is designed to provide public sewer services to the property. This certificate shall be recorded in the real property records of King County and shall be a permanent condition on the property running with the land until such time as the costs for connection are fully paid to the sewer district. The applicant cannot receive any development permits for the site until said agreement is executed, unless otherwise determined by the sewer district and designated City official.

(b) A new single-family home or an expansion or a remodel of a single-family home on a preexisting lot is not required to connect to the public sewer system if the availability of such sewer connection is greater than 300 feet from the property and the applicant has obtained approval for an on-site sewage system design from PHSKC in accordance with the codes of the King County Board of Health. Any approval and preliminary design for an on-site sewage system shall be submitted with the building permit application in accordance with the City’s application completeness requirements.

(c) A new accessory dwelling unit (ADU) permitted pursuant to Chapter 18.25 CMC is allowed on lots with an approved on-site sewage system, provided approval from PHSKC demonstrates that the existing on-site sewage system has adequate capacity for the ADU. If the existing on-site sewage system is inadequate to accommodate the ADU, then the applicant should obtain approval for an upgraded on-site sewage system design from the PHSKC in accordance with the codes of the King County Board of Health. Any approval and preliminary design for an improved on-site sewage system, associated with an ADU, shall be submitted with the building permit application in accordance with the City’s application completeness requirements.

(d) The development proposal does not require sewer service for its operations in accordance with Chapter 15.05 CMC, International Codes Adoption, and as determined by the PHSKC or sewer district.

(e) Repair, Modification, or Replacement of an Existing On-Site Sewage System. If the on-site sewage system has failed and a new system conforming to the PHSKC cannot be designed and installed, then the applicant shall be required to connect to the public sewer system, unless otherwise determined by the sewer district.

(3) If the applicant fails to obtain approval from PHSKC for the use of an on-site sewage system, then the applicant shall coordinate with the sewer district to provide an appropriate connection or other method of sewer disposal as determined by the sewer district. (Ord. 12-17 § 3)