Rhode Island Code of Regulations › Title 216 - Department of health › Chapter 50 - Environmental health › Subchapter 05 - Water Quality › Part 1 - Public Drinking Water (216-RICR-50-05-1) › Section 216-RICR-50-05-1.6.9 - Enhanced Treatment for Cryptosporidium

Current through June 14, 2024
A. General
				  Requirements.
1. The requirements of §
											1.6.9   of this Part are
				  National Primary Drinking Water Regulations. The Regulations in §
											1.6.9   of this Part
				  establish or extend treatment technique requirements in lieu of maximum
				  contaminant levels for Cryptosporidium. These requirements are in addition to
				  requirements for filtration and disinfection in other sections of this
				  Part.
2. Applicability. The
				  requirements of §
											1.6.9   of this Part apply to
				  all PWS subject to §
											1.6   of this Part, which are
				  PWS supplied by a surface water source and PWS supplied by a groundwater source
				  under the direct influence of surface water.
a. Wholesale PWS, as defined in §
												1.2   of this Part, must comply
				  with the requirements of §
												1.6.9   of this Part, based
				  on the population of the largest PWS in the combined distribution
				  system.
b. The requirements of
				  §
												1.6.9    of this Part for filtered PWS apply to PWS required by National Primary
				  Drinking Water Regulations to provide filtration treatment, whether or not the
				  PWS is currently operating a filtration system.
c. The requirements of §
												1.6.9   of this Part for
				  unfiltered PWS apply only to unfiltered PWS that timely met and continue to
				  meet the filtration avoidance criteria in §
												1.6   of this Part, as
				  applicable.
3.
				  Requirements. PWS subject to §
											1.6.9   of this Part, must
				  comply with the following requirements:
a. PWS
				  must conduct an initial and a second round of source water monitoring for each
				  plant that treats a surface water or GWUDI source. This monitoring may include
				  sampling for Cryptosporidium, E. coli, and turbidity as described in
				  §§
												1.6.9(B)
				  through  1.6.9(G)
				    of this Part, to determine what level, if any, of additional Cryptosporidium
				  treatment they must provide.
b. PWS
				  that plan to make a significant change to their disinfection practice must
				  develop disinfection profiles and calculate disinfection benchmarks, as
				  described in §§
												1.6.9(I)
				  through  1.6.9(J)   of this Part.
c. Filtered PWS must determine their
				  Cryptosporidium treatment bin classification as described in §
												1.6.9(K)
				    of this Part and provide additional treatment for Cryptosporidium, if required,
				  as described in §
												1.6.9(L)
				    of this Part. All unfiltered PWS must provide treatment for Cryptosporidium as
				  described in §
												1.6.9(M)
				    of this Part. Filtered and unfiltered PWS must implement Cryptosporidium
				  treatment according to the schedule in §
												1.6.9(N)
				    of this Part.
d. PWS required to
				  provide additional treatment for Cryptosporidium must implement microbial
				  toolbox options that are designed and operated as described in §§
												1.6.9(O)
				  through  1.6.9(T)   of this Part.
e. PWS must comply with the applicable
				  recordkeeping and reporting requirements described in §§
												1.6.9(U)
				  through  1.6.9(V)   of this Part.
f. PWS must address significant deficiencies
				  identified in sanitary surveys performed as described in §
												1.6.9(W)
				    of this Part.