WAC 246-290-630
General requirements. (1) The purveyor
shall ensure that treatment is provided for surface and GWI
sources consistent with the treatment technique requirements
specified in Part 6 of chapter 246-290 WAC.
(2) The purveyor shall install and properly operate water
treatment processes to ensure at least:
(a) 99.9 percent (3 log) removal and/or inactivation of
Giardia lamblia cysts;
(b) 99.99 percent (4 log) removal and/or inactivation of
viruses; and
(c) 99 percent (2 log) removal of Cryptosporidium oocysts
if required to filter.
(3) The purveyor shall ensure that the requirements of
subsection (2) of this section are met between a point where
the source water is not subject to contamination by untreated
surface water and a point at or before the first consumer.
(4) The department may require higher levels of removal
and/or inactivation of Giardia lamblia cysts, Cryptosporidium
oocysts, and viruses than specified in subsection (2) of this
section if deemed necessary to protect the health of consumers
served by the system.
(5) The purveyor shall ensure that personnel operating a
system subject to Part 6 of chapter 246-290 WAC meet the
requirements under chapter 70.119 RCW and chapter 246-292 WAC.
(6) The purveyor of a Group A community system serving
water from a surface or GWI source to the public before
January 1, 1991, shall comply with applicable minimum
treatment requirements. The purveyor shall meet either:
(a) The filtration and disinfection requirements under
WAC 246-290-660 and 246-290-662 respectively;
(b) The criteria to remain unfiltered under WAC 246-290-690 and the disinfection requirements under WAC 246-290-692; or
(c) The criteria to provide a limited alternative to
filtration under WAC 246-290-691 and the disinfection
requirements under WAC 246-290-692.
(7) The purveyor of a Group A noncommunity system serving
water from a surface or GWI source, shall meet either:
(a) The filtration and disinfection requirements under
WAC 246-290-660 and 246-290-662, respectively; or
(b) The criteria to provide a limited alternative to
filtration under WAC 246-290-691 and the disinfection
requirements under WAC 246-290-692.
(8) The purveyor of a Group A system first serving water
from a surface or GWI source to the public after December 31,
1990, shall meet either:
(a) The filtration and disinfection requirements under
WAC 246-290-660 and 246-290-662, respectively; or
(b) The criteria to provide a limited alternative to
filtration under WAC 246-290-691 and the disinfection
requirements under WAC 246-290-692.
(9) The purveyor of a system required to install
filtration may choose to provide a limited alternative to
filtration or abandon the surface or GWI source as a permanent
or seasonal source and develop an alternate,
department-approved source. Purveyors that develop alternate groundwater sources or purchase water from a
department-approved public water system using a groundwater source shall no longer be subject to Part
6 of chapter 246-290 WAC, once the alternate source is
approved by the department and is on line.
(10) A purveyor that chooses to provide a limited
alternative to filtration shall submit an application to the
department that contains the information necessary to
determine whether the source can meet the criteria.
(11) If a limited alternative to filtration is provided,
then the purveyor shall install and properly operate treatment
processes to ensure greater removal and/or inactivation
efficiencies of Giardia lamblia cysts, viruses, or other
pathogenic organisms of public health concern (including
Cryptosporidium oocysts) than would be achieved by the
combination of filtration and chlorine disinfection.
(12) Systems that were required to develop a disinfection
profile under 40 CFR 141.172 shall provide that profile and a
calculated disinfection benchmark, as described in 40 CFR
141.172 (c)(2) and (3), along with other project information
specified in WAC 246-290-110, when proposing any change to the
disinfection treatment system. The proposal for change shall
include an analysis of how the proposed change will affect the
current level of disinfection. The profile must also be
available for inspection during routine sanitary surveys
conducted under WAC 246-290-416.
(13) Community and nontransient noncommunity systems
serving less than ten thousand persons must meet the
disinfection profiling and benchmarking provisions required
under 40 CFR 141.530 through 141.544.
(14) Systems required to develop a disinfection profile
under 40 CFR 141.530 shall provide that profile and a
calculated disinfection benchmark, as described in 40 CFR
141.543 along with other project information specified in WAC 246-290-110, when proposing any change to the disinfection
treatment system. The proposal for change shall include an
analysis of how the proposed change will affect the current
level of disinfection. The profile must also be available for
inspection during routine sanitary surveys conducted under WAC 246-290-416.
(15) A system using conventional, direct, or in-line
filtration that must arrange for the conduct of a CPE, under
40 CFR 141.175 (b)(4) or 40 CFR 141.563, may be required to
arrange for CTA. The department will determine the need for
CTA on a case-by-case basis.
(16) Water systems subject to the requirements of Part 6
of this chapter must also comply with the enhanced treatment
requirements for Cryptosporidium under 40 CFR Subpart W. The
requirements are in addition to the requirements of Part 6 of
this chapter and include:
(a) General requirements under 40 CFR 141.700;
(b) Source monitoring requirements under 40 CFR
141.701-707;
(c) Disinfection profiling and benchmarking requirements
under 40 CFR 141.708-709;
(d) Treatment technique requirements under 40 CFR
141.710-714;
(e) Requirements for microbial toolbox components under
40 CFR 141.715-720; and
(f) Reporting and recordkeeping requirements under 40 CFR
141.721-722.
(17) Water systems using UV reactors to obtain treatment
credit for Cryptosporidium removal must:
(a) Validate the reactors using the validation testing
procedures specified under 40 CFR 141.720 (d)(2); or
(b) Validate the reactor under Austrian ONORM Standards
or German DVGW Standards.
[Statutory Authority: RCW 43.20.050 and 70.119A.080. 10-20-068, § 246-290-630, filed 9/29/10, effective 11/1/10. Statutory Authority: RCW 70.119A.180 and 43.20.050. 08-03-061, § 246-290-630, filed 1/14/08, effective 2/14/08. Statutory Authority: RCW 43.20.050 and 70.119A.080.
04-04-056, § 246-290-630, filed 1/30/04, effective 3/1/04.
Statutory Authority: RCW 43.20.050 (2) and (3) and70.119A.080
. 03-08-037, § 246-290-630, filed 3/27/03,
effective 4/27/03. Statutory Authority: RCW 43.20.050.
99-07-021 and 99-10-076, § 246-290-630, filed 3/9/99 and
5/4/99, effective 4/9/99 and 6/4/99; 93-08-011 (Order 352B), §
246-290-630, filed 3/25/93, effective 4/25/93.]