WAC 246-290-632. Treatment technique violations

(1) A treatment technique violation shall be considered a violation of a primary drinking water standard and in the case of an unfiltered system, may result in the purveyor of an unfiltered system being required to install filtration. (2) A treatment technique violation occurs when a system using a surface or GWI source is identified by the department as the source of a waterborne disease outbreak or any of the following occur as applicable: (a) The purveyor providing filtration delivers unfiltered water or fails to meet one or more of the following requirements: (i) Filtration treatment in accordance with WAC 246-290-660 ; or (ii) Disinfection treatment in accordance with WAC 246-290-662 . (b) The purveyor required to install filtration: (i) Fails to meet the interim disinfection requirements under WAC 246-290-672 or as otherwise directed by the department; or (ii) Fails to install filtration or develop an alternate source by the applicable time lines specified in WAC 246-290-670 . (c) The purveyor of an unfiltered surface water, or GWI source, meeting the criteria to remain unfiltered: (i) Delivers water with a turbidity level exceeding 5.0 NTU measured at a point immediately prior to the point of primary disinfection; or (ii) Fails to meet one or more of the disinfection requirements under WAC 246-290-692 after the dates specified in WAC 246-290-686 . (d) The purveyor of an unfiltered source meeting the criteria to provide a limited alternative to filtration: (i) Delivers water with a turbidity level exceeding 5.0 NTU measured at a point immediately prior to the point of primary disinfection; or (ii) Fails to meet one or more of the disinfection requirements under WAC 246-290-692 . (e) A purveyor supplies water from an unfiltered source that has not been previously approved by the department. (f) A purveyor of a department approved unfiltered source that fails to meet the on-going criteria to remain unfiltered: (i) Delivers water with a turbidity level exceeding 5.0 NTU measured at a point immediately prior to the point of primary disinfection; or (ii) Fails to meet one or more of the disinfection requirements under WAC 246-290-692 . (g) A purveyor of a department approved unfiltered source that has failed to meet the criteria to provide a limited alternative to filtration: (i) Delivers water with a turbidity level exceeding 5.0 NTU measured at a point immediately prior to the point of primary disinfection; or (ii) Fails to meet one or more of the disinfection requirements under WAC 246-290-692 . (h) A purveyor fails to meet the enhanced Cryptosporidium treatment requirements under 40 C.F.R. 141.711 or 141.712.