15A NCAC 18C .1509 SPECIAL MONITORING FOR SODIUM (a) Suppliers of water for community water systems shall collect and analyze one sample per plant at the entry point of the distribution system for the determination of sodium concentration levels. Samples must be collected and analyzed annually for systems utilizing surface water sources in whole or in part, and at least every three years for systems utilizing solely ground water sources. The minimum number of samples required to be taken by the system shall be based on the number of treatment plants used by the system, except that multiple wells drawing raw water from a single aquifer may, with Department approval, be considered one treatment plant for determining the minimum number of samples. The supplier of water may be required by the Department to collect and analyze water samples for sodium more frequently in locations where the sodium content is variable. (b) Suppliers of water for community water systems shall report to the Department the results of the analyses for sodium within the first 10 days of the month following the month in which the sample results were received or within the first 10 days following the end of the required monitoring period as stipulated by the Department, whichever is first. If more than annual sampling is required, the supplier shall report the average sodium concentration within 10 days of the month following the month in which the analytical results of the last sample used for the annual average was received. (c) The Department shall notify appropriate local health officials of the sodium levels found in community water systems. (d) Analyses conducted to determine compliance with this Rule shall be made in accordance with methods adopted by the United States Environmental Protection Agency and codified as 40 C.F.R. 141.41(d) that are hereby incorporated by reference including any subsequent amendments and editions. Copies are available for public inspection as set forth in Rule .0102 of this Subchapter. (e) Travel trailer parks, campgrounds, and marina slips that are community water systems as defined by G.S. 130A313(10), but do not serve 25 or more of the same persons more than six months per year shall be exempt from the provisions of this Rule. History Note: Authority G.S. 130A-315; P.L. 93-523; 40 C.F.R. 141; Eff. February 27, 1982; Transferred and Recodified from 10 NCAC 10D .1636 Eff. April 4, 1990; Amended Eff. April 1, 2014; July 1, 1994; September 1, 1990; Pursuant to G.S. 150B-21.3A, rule is necessary without substantive public interest Eff. November 23, 2015.