Environmental Engineering Reference
In-Depth Information
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Information Collection Rule
—To support the MDBP rulemaking pro-
cess, the Information Collection Rule establishes monitoring and
data reporting requirements for large public water systems serving
at least 100,000 people. This rule was intended to provide the USEPA
with information on the occurrence in drinking water of microbial
pathogens and DBPs. The USEPA is collecting engineering data on
how public water systems currently control such contaminants as
part of the Information Collection Rule.
Interim Enhanced Surface Water Treatment Rule and
Stage 1 Disinfectants and Disinfection Byproducts Rule
The USEPA finalized the Interim Enhanced Surface Water Treatment Rule and
Stage 1 Disinfectants and Disinfection Byproducts Rule in 1998, as required
by the 1996 amendments to the Safe Drinking Water Act, Section 1412(b)(2)(C).
The final rules resulted from formal regulatory negotiations with a wide range
of stakeholders that took place from 1992 to 1993 and in 1997.
Interim Enhanced Surface Water Treatment Rule
The Interim Enhanced Surface Water Treatment Rule applies to systems using
surface water or groundwater under the direct influence of surface water that
serve 10,000 or more persons. The rule also includes provisions for states
to conduct sanitary surveys for surface water systems regardless of system
size. The rule built upon the treatment technique requirements of the Surface
Water Treatment Rule with the following key additions and modifications:
• Maximum contaminant level goal (MCLG) of zero for
Cryptosporidium
• 2-log
Cryptosporidium
removal requirements for systems that filter
• Strengthened combined ilter efluent turbidity performance
standards
• Individual ilter turbidity monitoring provisions
• Disinfection proiling and benchmarking provisions
• Systems using groundwater under the direct inluence of surface
water now subject to the new rules dealing with
Cryptosporidium
• Inclusion of
Cryptosporidium
in the watershed control requirements
for unfiltered public water systems
• Requirements for covers on new inished water reservoirs
• Sanitary surveys, conducted by states, for all surface water systems
regardless of size
The Interim Enhanced Surface Water Treatment Rule, with tightened tur-
bidity performance criteria and required individual filter monitoring, was
designed to optimize treatment reliability and to enhance physical removal
