6.20.390 Sewer laterals and connections.
(1) Connection Requirements. A sewer lateral is the portion of a district owned sewer line between a sewer main and the right-of-way/property line or a dedicated district utility easement boundary. A developer extension agreement may be required for the installation of a new sewer lateral in accordance with Chapter 6.15 SLWSDC. All applicable specifications given herein for sewer construction shall be held to apply to sewer laterals.
Existing developed parcels making application to connect to only district water or sewer service will be required to connect to both sewer and water at the same time if services are available, such as the presence of an existing water main along the frontage or sewer lateral to the property line. This requirement may be waived at the discretion of the district if a developer extension is required for utility service in accordance with Chapter 6.15 SLWSDC.
(a) Residential. Each lot or unit of an attached or detached single-family residential structure, including townhomes, constructed under the current International Residential Code with independent interior plumbing systems shall be served with an individual sewer lateral connection without shared service lines unless otherwise approved or noted below.
Duplex structures may share one six-inch lateral connection between two units.
Accessory dwelling units (ADUs) constructed as a separate structure in a new development project, or on an existing developed lot with either an available sewer lateral or that may be subdivided in the future, shall be served with a separate individual sewer lateral connection.
Attached ADUs, or detached ADUs constructed on an existing developed lot without an available sewer lateral and cannot be subdivided, may share a single sewer lateral connection with district approval.
(b) Commercial and Multifamily. Commercial or multifamily structures constructed under the current International Building Code with shared interior plumbing systems can be served with a single shared lateral connection per building.
(c) Mixed Use. If residential, commercial and/or multifamily uses are located within the same building, separate residential, commercial and/or domestic laterals are required for each use classification, and the interior plumbing systems shall be separated accordingly.
(d) Recreational Vehicle Use. Recreational vehicle connections are only allowed as interim facilities for up to 180 days during the construction of a permanent dwelling unit in accordance with city or county land use regulations. Septage and RV holding tank discharges are not allowed within the district.
(2) Sewer Lateral Material and Installation. Sewer laterals shall be a minimum six-inch diameter pipe and the same material as the sewer main line unless otherwise approved by the district. Lateral connections shall be installed on the main line at a minimum 24-inch spacing.
Laterals shall be connected to a tee or wye provided in the sewer main where such is available, utilizing approved fittings or adapters. The lateral shall rise at a maximum slope of 45 degrees and a minimum of two percent from the sewer main.
Where no tee or wye is provided or available, a new lateral connection shall be made by machine-made tap and saddle. Inserta Tee, Fowler Manufacturing Company or approved equal may be utilized on concrete pipe only. Romac Style “CB” Sewer Saddle shall be utilized on PVC or ductile iron pipe.
Up to three sewer laterals may be installed in a sewer manhole with a minimum two-foot spacing in between each connection point. Manhole laterals shall be installed to match the crown elevation of the sewer main line pipe. The angle of flow between the lateral and main line in a manhole shall not exceed 90 degrees. Manholes shall be channeled accordingly.
Installation of sewer laterals to adjacent parcels along a gravity sewer main extension may be required for the developer to be eligible for a reimbursement agreement in accordance with SLWSDC 6.15.030.
The minimum lateral depth shall be six feet at the right-of-way/property line or district easement line, except where existing improvements, proposed improvements or topography may dictate otherwise. The elevations of the lateral connections shall be of sufficient depth to serve all existing and potential future basements by gravity unless otherwise approved by the district.
Each sewer lateral shall be provided with a 12-foot-long two-by-four wooden post, which extends from the end of the six-inch pipe. The exposed area of this post shall be painted white and shall be stenciled with “SEWER” in two-inch black letters. A 12-gauge (minimum) wire shall be wrapped around and stapled the full length of the two-by-four.
No bends are allowed in the lateral between the sewer main line and the end of the district owned pipe unless otherwise approved by the district.
Standing or vertical sewer laterals shall be constructed only with preapproval of the district. Standing sewer laterals may be required, or allowed, at the sole discretion of the district. When allowed, standing sewer laterals will be constructed of the same material as the main line sewer. Standing sewer laterals may be shared between two individual connections with the appropriate alignment. [Res. 835 § 2 (Exh. 2), 2022; Res. 735 § 1, 2017.]