1. (1) The purveyor shall provide public notice to the water system users when the department determines that a contaminant exceeds a SAL listed in WAC 246-290-315, Table 9.

2. (2) The public notice must be in conformance with the requirements under WAC 246-290-71001 through 246-290-71004 and based upon the public notice tier designation of the contaminant or group of contaminants in Table 17 of this section.

   1. (a) The purveyor shall complete public notice for an initial exceedance of a Tier 1 designated SAL within 24 hours of confirmation, and for every subsequent quarter in which analytical results exceed a SAL.
   2. (b) The purveyor shall complete public notification for an initial exceedance of a Tier 2 designated SAL as soon as practical, but no less than within 30 days of exceeding the SAL per Table 9 in WAC 246-290-315, and every three months thereafter as long as the results continue to exceed the SAL per Table 9 in WAC 246-290-315, or as directed by the department.

   TABLE 17

   PUBLIC NOTICE TIER DESIGNATION FOR CONTAMINANTS WITH A SAL

   Contaminant or Group of Contaminants	Public Notice Tier	SAL Exceedance Based on:
   PFOA	Tier 2	Running annual average
   PFOS	Tier 2	Running annual average
   PFHxS	Tier 2	Running annual average
   PFNA	Tier 2	Running annual average
   HFPO-DA	Tier 2	Running annual average
   Hazard Index PFAS (HFPO-DA, PFBS, PFHxS, and PFNA)	Tier 2	Running annual average

3. (3) The department may require public notice for other unregulated contaminants that are reported per requirements in WAC 246-390-075.

[Statutory Authority: RCW 43.20.050 (2)(a). WSR 26-01-082, s 246-290-71006, filed 12/15/25, effective 1/15/26. Statutory Authority: RCW 43.20.050, 70A.125.080, and 70A.130.010. WSR 21-23-097, § 246-290-71006, filed 11/17/21, effective 1/1/22. Statutory Authority: RCW 43.20.050 (2) and (3) and 70.119A.080. WSR 03-08-037, § 246-290-71006, filed 3/27/03, effective 4/27/03.]