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6.20.600 Requirements.
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(1) General.

(a) Compliance with the provisions of this article shall be a condition of receiving or to continue receiving the district’s water supply. It is unlawful for any person to allow any contaminants or pollutants to backflow from their facility and/or property into the district distribution system.

(b) All domestic connections, except for single-family and duplex connections, shall require the installation of an approved RPBA at the service connection or alternate location as approved by the district. The RPBA shall be installed, inspected and tested in accordance with the provisions of this article.

(c) All multifamily (other than duplexes) connections shall require, at a minimum, the installation of an RPBA at the service connection or alternate location as approved by the district. The RPBA shall be installed, inspected, and tested in accordance with the provisions of this article.

(d) All fire service connections shall be a dedicated and metered connection to the water main. All fire service connections, except for single-family residences and duplexes, shall require the installation of an RPDA or RPBA at the service connection or alternate location as approved by the district. Fire services for single-family residential or duplexes shall have, at a minimum, a DCVA at the service connection or an alternate location as approved by the district. Commercial fire service connections shall be equipped with either an RPBA or RPDA depending upon service size (see SLWSDC 6.20.320(23), general standards). In cases where an appropriately sized RPDA is unavailable, an RPBA shall be installed upstream of the fire system components. Fire protection systems which serve both residential and commercial buildings from the same service connection shall require an RPDA or RPBA. All backflow and detector-check assemblies shall be installed, inspected, and tested in accordance with the provisions of this article.

(e) All irrigation services, other than single-family (private) systems, shall be a dedicated and metered connection to the water main. A minimum of a DCVA shall be installed at the service connection. Any irrigation system, including single-family, that uses chemical injection of any kind shall be isolated from the district’s water system by an approved RPBA at the service connection (no exceptions). All backflow installations shall be installed, inspected, and tested in accordance with the provisions of this article.

(f) Single-family residences having hard plumbed irrigation systems shall apply one of the following means of backflow protection to protect the district’s water supply: DCVA, AVB, PVBA, or SVBA, as appropriate to system design. Protection shall be installed, inspected, and tested in accordance with the provisions of this article.

(g) The district requires that the public water supply be protected from contamination from cross connections. The owner shall be responsible for water quality beyond the district service meter. This responsibility includes proper installation, annual testing and maintenance of required backflow assemblies as provided in this article. Fixture isolation assemblies shall be installed in accordance with the UPC and/or AHJ as a condition of service.

(2) Tenant Improvements. All TIs that require any modification of the potable water or sewer internal plumbing shall require upgrade of the water and sewer systems to current district standards at the service connection, or alternate location as approved by the district that shall be installed, inspected, and tested in accordance with the provisions of this article.

(3) Silver Lake Water and Sewer District.

(a) For premises existing prior to the start of this program, the district will perform evaluations and inspections of plans and/or premises and inform the owner by letter of any corrective action deemed necessary, the method of achieving the correction and the time allowed for the correction to be made. A maximum of 60 days will be allowed; however, this time period may be adjusted by the district CCS depending upon all reasonable factors including but not limited to the performance history of the backflow assembly and the degree of hazard involved.

(b) Premises are subject to inspection on or after the expiration date of required action to correct a cross connection. Water service to premises that fail to comply with the district’s request shall receive written notice, via registered mail and regular mail, postage prepaid, that water service to the premises will be terminated within a period not to exceed 30 calendar days. In the event the owner informs the district of extenuating circumstances as to why the correction has not been completed, the district may grant a time extension up to but not exceeding an additional 30 days.

(c) If the district determines at any time that a serious threat to the public health exists, the water service may be terminated immediately; provided, however, that notice will be posted on the premises affected at the time said service is terminated and the proper AHJ is notified of the action.

(d) Inspection may be done during the initial installation and during on-site reviews of existing installations.

(4) Owner.

(a) An easement shall be provided to the district for access to all backflow assemblies required to protect the public potable water supply from possible contamination.

(b) When a test identifies a backflow assembly is not properly functioning, the owner shall correct the malfunction and have the assembly inspected and retested or replaced until proper backflow protection is restored.

(c) The owner shall be responsible for the elimination or protection of all cross connection on their premises.

(d) The owner after notification by the district shall, at their expense, install any and all required backflow assemblies.

(e) The owner shall, at their expense, be responsible for having all backflow assemblies tested:

(i) At the time of installation;

(ii) Annually after installation or more frequently in cases of repeated failure to meet test criteria;

(iii) After an assembly is repaired, reinstalled or relocated; or

(iv) An air gap is replumbed or replaced by a district approved assembly. The test shall be performed by a Washington State-certified BAT. The results of the tests shall be reported within 30 days to the district CCS on a form provided by or approved by the district.

(f) The owner shall immediately notify the district CCS of any malfunction of the approved backflow assembly that is revealed by periodic testing. The required repair or replacement of said assembly(ies) shall be completed within 30 days.

(g) The owner shall inform the district of any proposed modifications to their plumbing that creates a possible cross connection and also any existing cross connections of which the owner has actual knowledge but has not been found by the district.

(h) The owner shall install only backflow prevention assemblies from the current list of Washington State approved assemblies (WSDOH Publication No. 331-137) as it exists now or as hereinafter changed, modified, amended, reenacted or recodified.

(i) Any owner having a private well or other private water source desiring to connect to the districts’ water supply shall decommission the well per WAC 173-160-381 as it exists now or as hereinafter changed, modified, amended, reenacted or recodified.

(j) The owner shall provide district personnel access to premises for cross connection inspection at the district’s request. Failure to provide access to inspect facilities shall be grounds for termination of water service and/or installation of appropriate backflow assembly behind the meter by district crews at the owners’ expense. [Res. 735 § 1, 2017.]

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