South Carolina Code of Regulations › Chapter 61 - DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL › Subchapter 61-58.11 - Control of Lead and Copper › Section 61-58.11.H - Monitoring Requirements for Lead and Copper in Tap Water

Current through Register Vol. 48, No. 6, June 28, 2024
(1) Sample Site Location
(a) By the applicable date for commencement
			 of monitoring under paragraph (4)(a) of this section, each water system shall
			 identify a pool of targeted sampling sites based on the service line inventory
			 conducted in accordance with R.61-58.11.F(1),
			 that meet the requirements of this section, and which is sufficiently large
			 enough to ensure that the water system can collect the number of lead and
			 copper tap samples required in paragraph (3) of this section. Sampling sites
			 may not include sites with installed point-of-entry (POE) treatment devices and
			 taps used at sampling sites may not have point-of-use (POU) devices designed to
			 remove inorganic contaminants, except for water systems monitoring under
			 R.61-58.11.O(1)(c)(iv)
			 and water systems using these devices for the primary drinking water tap to
			 meet other primary and secondary drinking water standards and all service
			 connections have POEs or POUs to provide localized treatment for compliance
			 with the other drinking water standards. Lead and copper sampling results for
			 systems monitoring under R.61-58.11.O(1)(c)(iv)
			 may not be used for the purposes of meeting the criteria for reduced monitoring
			 specified in paragraph (4)(d) of this section.
(b) A water system must use the information
			 on lead, copper, and galvanized iron or steel that it is required to be
			 identified under R.61-58.5.V when conducting a
			 materials evaluation and the information on lead service lines that is required
			 to be collected under R.61-58.11.F(1) to
			 identify potential lead service line sampling sites.
(c) The sampling sites selected for a
			 community water system's sampling pool must consist of single-family structures
			 that are served by a lead service line ("Tier 1 sampling sites''). When
			 multiple-family residences comprise at least twenty percent (20%) of the
			 structures served by the water system, the system may include these types of
			 structures in its Tier 1 sampling pool, if served by a lead service line. Sites
			 with lead status unknown service lines must not be used as Tier 1 sampling
			 sites.
(d) A community water system
			 with insufficient Tier 1 sampling sites must complete its sampling pool with
			 "Tier 2 sampling sites,'' consisting of buildings, including multiple-family
			 residences that are served by a lead service line. Sites with lead status
			 unknown service lines must not be used as Tier 2 sampling sites.
(e) A community water system with
			 insufficient Tier 1 and Tier 2 sampling sites must complete its sampling pool
			 with "Tier 3 sampling sites,'' consisting of single-family structures that
			 contain galvanized lines identified as being downstream of a lead service line
			 (LSL) currently or in the past, or known to be downstream of a lead gooseneck,
			 pigtail, or connector. Sites with lead status unknown service lines must not be
			 used as Tier 3 sampling sites.
(f)
			 A community water system with insufficient Tier 1, Tier 2, and Tier 3 sampling
			 sites must complete its sampling pool with "Tier 4 sampling sites,'' consisting
			 of single-family structures that contain copper pipes with lead solder
			 installed before the effective date of the state's applicable lead ban. Sites
			 with lead status unknown service lines must not be used as Tier 4 sampling
			 sites.
(g) A community water system
			 with insufficient Tier 1, Tier 2, Tier 3, and Tier 4 sampling sites must
			 complete its sampling pool with "Tier 5 sampling sites,'' consisting of
			 single-family structures or buildings, including multiple family residences
			 that are representative of sites throughout the distribution system. For the
			 purpose of this paragraph (1)(g), a representative site is a site in which the
			 plumbing materials used at that site would be commonly found at other sites
			 served by the water system. Water systems may use non-residential buildings
			 that are representative of sites throughout the distribution system if and only
			 if there are an insufficient number of single-family or multiple family
			 residential Tier 5 sites available.
(h) The sampling sites selected for a
			 non-transient, non-community water system must consist of sites that are served
			 by a lead service line ("Tier 1 sampling sites''). Sites with lead status
			 unknown service lines must not be used as Tier 1 sampling sites.
(i) A non-transient, non-community water
			 system with insufficient Tier 1 sites complete its sampling pool with "Tier 3
			 sampling sites,'' consisting of sampling sites that contain galvanized lines
			 identified as being downstream of an LSL currently or in the past, or known to
			 be downstream of a lead gooseneck, pigtail, or connector. Sites with lead
			 status unknown service lines must not be used as Tier 3 sampling
			 sites.
(j) A non-transient,
			 non-community water system with insufficient Tier 1 and Tier 3 sampling sites
			 must complete its sampling pool with "Tier 5 sampling sites,'' consisting of
			 sampling sites that are representative of sites throughout the distribution
			 system. For the purpose of this paragraph (1)(j), a representative site is a
			 site in which the plumbing materials used at that site would be commonly found
			 at other sites served by the water system.
(k) A water system whose distribution system
			 contains lead service lines must collect all samples for monitoring under this
			 section from sites served by a lead service line. A water system that cannot
			 identify a sufficient number of sampling sites served by lead service lines
			 must still collect samples from every site served by a lead service line, and
			 collect the remaining samples in accordance with tiering requirements under
			 paragraphs (1)(e) through (g) or paragraphs (1)(i) through (j) of this
			 section.