327 IAC 8-2.5-4 - General requirements; disinfectant residuals, disinfection byproducts, and disinfection byproducts precursors
Authority: IC 13-13-5-1; IC 13-14-8-2; IC 13-14-8-7; IC 13-18-3-2
Affected: IC 13-12-3-1; IC 13-13-5-2; IC 13-14-9; IC 13-18-11
Sec. 4.
(a) The
general requireme nts for disinfectant residuals, disinfection byproducts, and
disinfection byproducts precursors are as follows:
(1) A CWS or an NTNCWS, which adds a chemical
disinfectant to the water in any part of the drinking water treatment process,
shall modify its practices to meet MCLs and MRDLs in sections 2(a) and 3(a) of
this rule, respectively, and shall meet the treatment technique requirements
for disinfection byproduct precursors in section 9 of this rule.
(2) A TWS that uses chlorine dioxide as a
disinfectant or oxidant shall modify its practices to meet the MRDL for
chlorine dioxide in section 3(a) of this rule.
(b) Compliance dates for CWSs and NTNCWSs are
as follows:
(1) A subpart H system serving a
population of ten thousand (10,000) or more individuals shall comply with this
section upon the effective date of this rule.
(2) A subpart H system serving a population
of fewer than ten thousand (10,000) individuals and a system using only ground
water not under the direct influence of surface water shall comply with this
section beginning January 1, 200Sec. 4.
(c) Compliance dates for TWSs are as follows:
(1) A subpart H system serving a population
of ten thousand (10,000) or more individuals and using chlorine dioxide as a
disinfectant or oxidant shall comply with requirements for chlorine dioxide in
this section upon the effective date of this rule.
(2) A subpart H system serving a population
of fewer than ten thousand (10,000) individuals and using chlorine dioxide as a
disinfectant or oxidant and a system using only ground water not under the
direct influence of surface water and using chlorine dioxide as a disinfectant
or oxidant shall comply with requirements for chlorine dioxide in this section
beginning January 1, 200Sec. 4.
(d) A CWS or a NTNCWS regulated under
subsection (a) must be operated by qualified personnel who meet the
requirements specified by 327 IAC 8-12.
(e) Notwithstanding the MRDLs in section 3 of
this rule, systems may increase residual disinfectant levels in the
distribution system of chlorine or chloramines, but not chlorine dioxide, to a
level and for a time necessary to protect public health and to address specific
microbiological contamination problems caused by circumstances, including the
following:
(1) Distribution line
breaks.
(2) Storm water run-off
events.
(3) Source water
contamination events.
(4)
Cross-connection events.
Notes
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