(a) The State Water Resources Control Board shall adopt regulations governing the use of point-of-entry and point-of-use treatment by public water systems in lieu of centralized treatment where it can be demonstrated that centralized treatment is not immediately economically feasible, limited to the following:

1. (1) Water systems with less than 200 service connections.
2. (2) Usage not prohibited by the federal Safe Drinking Water Act and its implementing regulations and guidance.
3. (3) Water systems that have submitted applications for funding to correct the violations for which the point-of-entry and point-of-use treatment is provided.

(b) The State Water Resources Control Board shall adopt emergency regulations governing the permitted use of point-of-entry and point-of-use treatment by public water systems in lieu of centralized treatment.

1. (1) The emergency regulations shall comply with Section 116552, and shall comply with all of the requirements set forth in subdivision (a) applicable to nonemergency regulations, but shall not be subject to the rulemaking provisions of the Administrative Procedure Act (Chapter 3.5 (commencing with Section 11340) of Part 1 of Division 3 of Title 2 of the Government Code). The emergency regulations shall take effect when filed with the Secretary of State, and shall be published in the California Code of Regulations.
2. (2) The emergency regulations adopted pursuant to this subdivision shall remain in effect until the earlier of January 1, 2018, or the effective date of regulations adopted pursuant to subdivision (a).