Municipal water suppliers required to submit a water system plan for department approval under WAC 246-290-100(2) must also include in the water system plan the provisions of this section as required under RCW 43.20.260. In approving a water system plan, the department shall ensure that water service to be provided by the water system for any new industrial, commercial, or residential use is consistent with local plans and regulations.

(1) A municipal water supplier has a duty to provide retail water service to all new service connections within its retail service area if:

(a) It can be available in a timely and reasonable manner;

(b) There is sufficient water rights to provide water service;

(c) There is sufficient capacity to serve the water in a safe and reliable manner as determined by the department; and

(d) It is consistent with the requirements of local plans and regulations and, for water service by the water utility of a city or town, with the utility service extension ordinances of the city or town.

(2) Municipal water suppliers shall include a retail service area map in the water system plan.

(3) Municipal water suppliers must meet the requirements of WAC 246-290-108.

(4) Municipal water suppliers shall include their service policies and conditions of service including how new service will be provided in the water system plan.

(5) Municipal water suppliers may provide temporary water service to another water system to resolve a significant public health and safety concern prior to meeting the requirements of this section.