(1) The purveyor of community or NTNC water systems required to monitor under 40 C.F.R. 141.40 shall notify the water system users of the availability of the results of monitoring for unregulated contaminants no later than twelve months after the monitoring results are known. The form and manner of the public notice to the water system users shall be in accordance with 40 C.F.R. 141.204 (c), (d)(1), and (d)(3). The notice must also identify a person and provide the telephone number to contact for information on the monitoring results.

(2) The purveyor of a community water system that exceeds the fluoride secondary MCL of 2.0 mg/L but does not exceed the fluoride primary MCL of 4.0 mg/L shall provide notice, in accordance with the form, manner, timing, distribution, and content requirements of 40 C.F.R. 141.208.

(3) The purveyor of a water system using surface water or GWI sources that repeatedly fails to monitor for Cryptosporidium or determine the bin classification or mean Cryptosporidium level, must notify the public under 40 C.F.R. 141.211.

(4) The purveyor of a community groundwater system that receives notice from the department of a significant deficiency or an E. coli positive groundwater source sample that is not invalidated by the department, must notify the public under WAC 246-290-72013.

(5) The purveyor of a noncommunity groundwater system with a significant deficiency that has not been corrected within twelve months of being notified or earlier if directed must notify the public under WAC 246-290-72013. The system must continue to notify the public annually until the significant deficiency is corrected. The information must include:

(a) The nature of the significant deficiency and the date it was identified by the department;

(b) A department-approved plan and schedule for correcting the significant deficiency including interim measures, progress to date, and which interim measures have been completed;

(c) In communities with a large proportion of non-English speaking consumers, the notice must contain information in the appropriate language(s) regarding the importance of the notice or contain a telephone number or address where the consumers may contact the system to obtain a translated copy of the notice or assistance with the appropriate language; and

(d) If directed by the department, a system with significant deficiencies that have been corrected must inform its customers of the significant deficiencies, how the deficiencies were corrected, and the date(s) of correction under (a) through (c) of this subsection.