Missouri Code of State Regulations › Title 10 - DEPARTMENT OF NATURAL RESOURCES › Division 60 - Safe Drinking Water Commission › Chapter 15 - Lead and Copper › Section 10 CSR 60-15.070 - Monitoring Requirements for Lead and Copper in Tap Water

Current through Register Vol. 49, No. 14, July 15, 2024
PURPOSE: This rule establishes the monitoring
				  requirements which are applicable to lead and copper in drinking
				  water.
(1) Sample Site
				Location. A water system shall use the information on lead, copper, and
				galvanized steel that it is required to collect under this section when
				conducting a materials evaluation. When an evaluation of the information
				collected pursuant to this section is insufficient to locate the requisite
				number of lead and copper sampling sites that meet the targeting criteria in
				subsection (1)(A) of this rule, the water system shall review the sources of
				information listed in this rule in order to identify a sufficient number of
				sampling sites. In addition, the system shall seek to collect that information
				where possible in the course of its normal operations (for example, checking
				service line materials when reading water meters or performing maintenance
				activities); all plumbing codes, permits, and records in the files of the
				building department(s) which indicate the plumbing materials that are installed
				within publicly- and privately-owned structures connected to the distribution
				system; all inspections and records of the distribution system that indicate
				the material composition of the service connections that connect a structure to
				the distribution system; and all existing water quality information, which
				includes the results of all prior analyses of the system or individual
				structures connected to the system, indicating locations that may be
				particularly susceptible to high lead or copper concentrations.
(A) By the applicable date for commencement
				of monitoring under subsection (4)(A) of this rule, each water system shall
				complete a materials evaluation of its distribution system in order to identify
				a pool of targeted sampling sites that meets the requirements of this section
				and which is sufficiently large to ensure that the water system can collect the
				number of lead and copper tap samples required in section (3) of this rule. All
				sites from which first-draw samples are collected shall be selected from this
				pool of targeted sampling sites. Sampling sites may not include faucets that
				have point-of-use or point-of-entry treatment devices designed to remove
				inorganic contaminants.
(B)
				Community water supply systems shall identify whether the following
				construction materials are present in their distribution system:
1. Lead from piping, solder caulking,
				interior lining of distribution mains, alloys, and home plumbing;
2. Copper from piping and alloys, service
				lines, and home plumbing;
3.
				Ferrous piping materials, such as cast iron and steel;
4. Asbestos cement pipe;
5. Vinyl-lined asbestos cement pipe;
				and
6. Coal tar-lined pipes and
				tanks.
(C) The sampling
				sites selected for a community water system's sampling pool (tier 1 sampling
				sites) shall consist of single-family structures that contain copper pipes with
				lead solder installed after 1982, or contain lead pipes, or are served by a
				lead service line, or a combination of these. When multiple-family residences
				comprise at least twenty percent (20%) of the structures served by a water
				system, the system may include these types of structures in its sampling
				pool.
(D) Any community water
				system with insufficient tier 1 sampling sites shall complete its sampling pool
				with tier 2 sampling sites, consisting of buildings, including multiple-family
				residences, that contain copper pipes with lead solder installed after 1982, or
				contain lead pipes, or are served by a lead service line, or a combination of
				these.
(E) Any community water
				system with insufficient tier 1 and tier 2 sampling sites shall complete its
				sampling pool with tier 3 sampling sites, consisting of single-family
				structures that contain copper pipes with lead solder installed before 1983. A
				community water system with insufficient tier 1, tier 2, and tier 3 sampling
				sites shall complete its sampling pool with representative sites throughout the
				distribution system. 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.
(F) The sampling
				sites selected for a non-transient noncommunity water system (tier 1 sampling
				sites) shall consist of buildings that contain copper pipes with lead solder
				installed after 1982, or contain lead pipes, or are served by a lead service
				line, or a combination of these.
(G) A non-transient noncommunity water system
				with insufficient tier 1 sites that meet the targering criteria in subsection
				(1)(F) of this rule shall complete its sampling pool with sampling sites that
				contain copper pipes with lead solder installed before 1983. If additional
				sites are needed to complete the sampling pool, the non-transient noncommunity
				water system shall use representative sites throughout the distribution system.
				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.
(H) Any water system whose
				distribution system contains lead service lines shall draw fifty percent (50%)
				of the samples it collects during each monitoring period from sites that
				contain lead pipes or copper pipes with lead solder and fifty percent (50%) of
				those samples from sites served by a lead service line. A water system that
				cannot identify a sufficient number of sampling sites served by a lead service
				line shall collect first-draw samples from all of the sites identified as being
				served by these lines.