Code of Massachusetts Regulations › 310 CMR - DEPARTMENT OF ENVIRONMENTAL PROTECTION › Title 310 CMR 22.00 - Drinking Water › Section 22.20G - Long Term Two Enhanced Surface Water Treatment Rule

Current through Register 1525, July 5, 2024
(1)
General
			 Requirements
.
(a)310 CMR 22.20G
			 establishes or extends Treatment Technique requirements in
lieu
of Maximum Contaminant Levels for
Cryptosporidium
. These requirements are in addition to
			 requirements for Filtration and Disinfection in
			 310 CMR
			 22.20A,
			 22.20D,
			 and
			 22.20F.
(b) Applicability. 310 CMR 22.20G applies to
			 all suppliers of water using a Surface Water Source, or groundwater source
			 under the direct influence of surface water.
1. Wholesale Systems, as defined in
			 310 CMR 22.02, must
			 comply with the requirements of 310 CMR 22.20G based on the population of the
			 largest system in the Combined Distribution System.
2. The requirements of 310 CMR 22.20G for
			 filtered systems apply to systems required by National Primary Drinking Water
			 Regulations and
			 310 CMR
			 22.00 to provide Filtration treatment, whether or not
			 the system is currently operating a Filtration system.
3. The requirements of 310 CMR 22.20G for
			 unfiltered systems apply only to unfiltered systems that timely met and
			 continue to meet the Filtration avoidance criteria in
			 310 CMR
			 22.20A,
			 22.20D,
			 and
			 22.20F,
			 as applicable.
(c)
Requirements
. Systems subject to 310 CMR 22.20G must
			 comply with the following requirements:
1.
			 Systems must conduct an initial and a second round of source water monitoring
			 for each plant supplied by a Surface Water Source, or groundwater source under
			 the direct influence of surface water. This monitoring may include sampling for
Cryptosporidium
,
E. coli
, and Turbidity as
			 described in 310 CMR 22.20G(2) through (7), to determine what level, if any, of
			 additional
Cryptosporidium
treatment the public water supplier
			 must provide.
2. Systems that plan
			 to make a significant change to their Disinfection practice must develop
			 Disinfection Profiles and calculate Disinfection benchmarks, as described in
			 310 CMR 22.20G(9) through (10).
3.
			 Filtered systems must determine their
Cryptosporidium
treatment bin classification as described in 310 CMR 22.20G(11) and provide
			 additional treatment for
Cryptosporidium
, if required, as
			 described in 310 CMR 22.20G(12). All unfiltered systems must provide treatment
			 for
Cryptosporidium
as described in 310 CMR 22.20G(13).
			 Filtered and unfiltered systems must implement
Cryptosporidium
treatment according to the schedule in 310 CMR 22.20G(14).
4. Systems with uncovered finished water
			 storage facilities must comply with the requirements to cover the facility or
			 treat the discharge from the facility as described in 310 CMR
			 22.20G(15).
5. Systems required to
			 provide additional treatment for
Cryptosporidium
must
			 implement microbial toolbox options that are designed and operated as described
			 in 310 CMR 22.20G(19) through (23).
6. Systems must comply with the applicable
			 recordkeeping and reporting requirements described in 310 CMR 22.20G(16) and
			 (17).