Compilation of Rules and Regulations of the State of Georgia › Department 391 - RULES OF GEORGIA DEPARTMENT OF NATURAL RESOURCES › Chapter 391-3 - ENVIRONMENTAL PROTECTION › Subject 391-3-5 - RULES FOR SAFE DRINKING WATER › Rule 391-3-5-.20 - Turbidity Sampling and Analytical Requirements

Current through
				Rules and Regulations filed through June 27, 2024
(1)
Turbidity Testing Frequency
.
				On and after June 29, 1993, representative samples of filtered water shall be
				taken and analyzed by said suppliers at least every four hours when the plant
				is in operation, for the purpose of making turbidity measurements to determine
				compliance with the treatment technique requirement of Rule
				391-3-5-.18(3). If
				the Division determines that a reduced sampling frequency in a non-community
				system will not pose a risk to public health, it can reduce the required
				sampling frequency in accordance with
				40 CFR
				141.74 for systems using slow sand filtration
				or filtration treatment other than conventional treatment, direct filtration,
				or diatomaceous earth filtration. The option of reducing the turbidity
				frequency shall be permitted only in those public water systems that practice
				disinfection and which maintain an active residual disinfectant in the
				distribution system and in those cases where the Division has indicated in
				writing that no unreasonable risk to health existed under the circumstances of
				this option. The turbidity measurements shall be made in accordance with the
				recommendations set forth in 40 CFR Part 141.22.
(2)
Exceedance Determination
. If
				a turbidity treatment violation has occurred based on a single exceedance of
				the maximum allowable turbidity limit, the supplier of water shall consult with
				the Division as soon as practical but no later than 24 hours after learning of
				the violation (40 CFR
				141.203(b)). If the
				consultation does not occur within those 24 hours, the violation is elevated to
				Tier 1 under 40 CFR Subpart Q. If the monthly treatment technique requirement
				is exceeded, or if any measured turbidity level exceeds the maximum allowable
				level, the supplier of water shall report to the Division and notify the public
				as directed in Rules
				391-3-5-.30 and
				.32.
(3)
Applicability to Surface Water
				Sources
. The requirements of this Rule shall apply only to public water
				systems, which use water obtained in whole or in part from surface water
				sources or ground water sources under the direct influence of surface
				water.
(4)
Compliance and
				Enforcement
. The Division has the authority to determine compliance or
				initiate enforcement action based upon analytical results or other information
				compiled by their sanctioned representatives or agencies.
(5)
Filtration Requirements for Greater
				than 10,000 Population Water Systems
. Beginning January 1, 2002, public
				water systems that use surface water or ground water under the direct influence
				of surface water and serve at least 10,000 people must meet the filtration
				requirements specified in 40
				CFR §
										141.173.
(6)
Enhanced Filtration
				Requirements
. The Enhanced Filtration and Disinfection requirements
				specified in 40 CFR, Subpart P are applicable to Subpart H systems serving at
				least 10,000 people.
(a) General requirements:
				40 CFR, Subpart P §
											141.170 is hereby incorporated by reference.
				Subpart H systems that did not conduct optional monitoring under § 141.172
				because they served fewer than 10,000 persons when such monitoring was
				required, but serve more than 10,000 persons prior to January 14, 2005 must
				comply with §
										§ 141.170, 141.171, 141.173, 141.174, and 141.175.
				These systems must contact the Division and establish a disinfection benchmark.
				A system that decides to make a significant change to its disinfection
				practice, as described in § 141.172(c)(1)(i) through (iv) must obtain
				prior approval from the Division prior to making such change.
(b) Criteria for avoiding filtration:
				40 CFR, Subpart P §
											141.171 is hereby incorporated by
				reference.
(c) Disinfection
				profiling and benchmarking: 40 CFR, Subpart P §
											141.172
				is hereby incorporated by reference.
(d) Determination of systems required to
				profile: 40 CFR, Subpart P
				§
											141.172(a) is hereby
				incorporated by reference.
(e)
				Disinfection profiling: 40
				CFR, Subpart P §
											141.172(b) is hereby
				incorporated by reference.
(f)
				Disinfection benchmarking: 40 CFR, Subpart P §
											141.172(c) is hereby
				incorporated by reference.