process will lead up to a potential change in the perchlorate MCL
after a few years of data gathering. For systems that use sodium
hypochlorite or chloramines, a lower MCL challenges the potential
low levels of perchlorate that (under certain operating conditions)
may be producing perchlorate using these treatment technologies.
At the federal level, USEPA is under a court order to establish
a perchlorate MCL by 2019, based on the new National Academy
of Sciences health effects model that incorporates exposure and risk
for sensitive populations. OEHHA is also considering revising the
perchlorate PHG for California as well.
TN JULY 18, 2017 SWRCB ESTABLISHED a 5 ppt MCL for
1,2,3-Trichloropropane (1,2,3-TCP). This action has set in
motion the following timeline:
October 2, 2017 MCL effective date.
January 1, 2018 Initial monitoring (four quarters) commences.
Best Available Technology (BAT) for 1,2,3-TCP is granular ac-tivated
carbon (GAC). Water systems that want to grandfather his-torical
data to meet their initial monitoring obligation may use up
to three quarters of data from samples collected within two years
of the effective date.
SSS Lead & Copper
TWRCB HAS ESTABLISHED A NEW PORTAL for submitting
Lead and Copper Rule compliance data via its new Lab-To-
State web portal. State sample site IDs are not required to be as-signed
to Lead and Copper Rule compliance samples.
14 SOURCE fall 2017
Update on the Lead in Schools program: Less than 10 percent of
California schools statewide have submitted requests to water sys-tems
to collect samples. Of the samples that have been collected
and analyzed, less than one percent are above the lead action level.
SSS ELAP Lab Standards Implementation
THE ENVIRONMENTAL LABORATORY ACCREDITATION
Program (ELAP) is working to establish new laboratory stan-dards.
Its Environmental Laboratory Technical Advisory Committee
is scheduled to take up the proposed new regulations at its Decem-ber
2017 meeting, and ELAP has set a goal of January 1, 2018 as an
effective date. New quality systems would need to be implemented
two years from the new standard’s effective date.
SSS Unregulated Contaminants Monitoring Rule 4 (UCMR4)
TSEPA’S UNREGULATED CONTAMINANTS MONITORING
Rule 4 (UCMR4) monitoring begins on January 1, 2018. All large
water systems are required to monitor for chemical, disinfection, and
(for surface water systems only) algal toxin constituents. Some key
dates leading up to the start of monitoring that systems should be
October 31, 2017 Groundwater representative monitoring plans due.
December 31, 2017 Central Data Exchange inventories /schedule updated
in Safe Drinking Water Information System (SIDWIS).
Water systems that have questions about UCMR4 should
contact USEPA directly at UCMR_Sampling_Coordinator@epa.gov or
the Region 9 designated UCMR4 coordinator, Jake Jenzen at Jenzen.
DRIPS & DROPLETS
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