Washington Administrative Code
Title 246 - Health, Department of
WATER SYSTEMS
Chapter 246-290 - Group A public water supplies
Part 5 - WATER SYSTEM OPERATIONS
Section 246-290-455 - Operation of chemical contaminant treatment facilities
Universal Citation: WA Admin Code 246-290-455
Current through Register Vol. 24-18, September 15, 2024
(1) Finished drinking water from chemical contaminant treatment facilities must comply with the minimum water quality standards established in WAC 246-290-310. This section does not apply to facilities used only for corrosion control treatment purposes.
(a) The purveyor shall collect finished
drinking water samples at a point directly downstream of the treatment system
prior to the first consumer on a monthly basis.
(i) Finished drinking water samples from
treatment systems utilized for removal of contaminants with established primary
MCLs shall be submitted to a certified laboratory for analysis of the specific
contaminant(s) of concern.
(ii)
Finished drinking water samples from treatment systems utilized for removal of
contaminants with established secondary MCLs shall be submitted to a certified
laboratory for analysis or analyzed for the specific contaminant(s) of concern
by the purveyor through department-approved on-site methods.
(iii) Additional finished drinking water
monitoring may be required by the department based on the complexity or size of
the water system.
(b) If
primary MCLs following treatment are exceeded in four or more months of a
consecutive twelvemonth compliance period, the purveyor shall submit a project
report to the department that addresses the failure to maintain compliance. The
project report shall include methods and schedules to correct the treatment
deficiency and/or indicate schedules for implementing an alternate source of
supply or an effective treatment technology.
(c) If secondary MCLs following treatment are
exceeded in four or more months of a consecutive twelvemonth compliance period,
the purveyor shall take action per WAC
246-290-320(3)(d).
(2) Purveyors that treat to remove or blend to reduce a contaminant that exceeds the SAL shall:
(a) Collect finished drinking water samples
at a point downstream of the treatment system prior to the first consumer on a
quarterly basis; and
(b) Submit the
samples to a certified lab for analysis or analyze the samples using
department-approved on-site methods.
Statutory Authority: RCW 43.02.050 [43.20.050]. 99-07-021, § 246-290-455, filed 3/9/99, effective 4/9/99.
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