{"id":40,"date":"2024-08-21T17:50:36","date_gmt":"2024-08-21T17:50:36","guid":{"rendered":"https:\/\/www.vdh.virginia.gov\/legionella\/?page_id=40"},"modified":"2024-09-18T13:52:37","modified_gmt":"2024-09-18T13:52:37","slug":"information-for-waterworks-owners","status":"publish","type":"page","link":"https:\/\/www.vdh.virginia.gov\/legionella\/information-for-waterworks-owners\/","title":{"rendered":"Information for Waterworks Owners"},"content":{"rendered":"<p>The U.S. Environmental Protection Agency (EPA) has not established a Maximum Contaminant Level for\u00a0<em>Legionella<\/em>\u00a0in drinking water and does not require analysis for\u00a0<em>Legionella<\/em>.\u00a0 The EPA\u2019s\u00a0<a href=\"https:\/\/www.epa.gov\/sites\/production\/files\/2015-10\/documents\/guidance_manual_for_compliance_with_the_filtration_and_disinfection_requirements.pdf\">Guidance Manual For Compliance With The Filtration And Disinfection Requirements For Public Water Systems Using Surface Water Sources<\/a>\u00a0states that:<\/p>\n<blockquote><p>treatment requirements for disinfection of a municipal water supply are thought to provide at least a 3 log reduction of\u00a0<em>Legionella<\/em>\u00a0bacteria. However, some recontamination may occur in the distribution system due to cross connections and during installation and repair of water mains. It has been hypothesized that the low concentrations of\u00a0<em>Legionella<\/em>\u00a0entering buildings due to these sources may colonize and regrow in hot water systems.<\/p><\/blockquote>\n<p>Maintaining a satisfactory disinfectant residual throughout the distribution system is crucial to controlling\u00a0<em>Legionella<\/em>\u00a0bacteria and associated biofilms. The disinfectant residual necessary to control\u00a0<em>Legionella<\/em>\u00a0may be higher than the regulatory minimum, and disinfectant residuals within buildings may be much lower than disinfectant residuals within the distribution system. Waterworks Owners are encouraged to work with building owners to determine the disinfectant residuals required to control\u00a0<em>Legionella<\/em>\u00a0in large or high risk facilities.<\/p>\n<p>The EPA has established a Maximum Contaminant Level Goal (MCLG) of zero organisms for drinking water.\u00a0 An MCLG is a non-enforceable guideline based solely on an evaluation of possible health risks, taking into consideration a margin for public safety.<\/p>\n<p>Additional\u00a0<em>Legionella<\/em>\u00a0resources for waterworks can be found at the\u00a0<a href=\"https:\/\/www.awwa.org\/resources-tools\/water-knowledge\/legionella.aspx\">AWWA\u00a0<em>Legionella<\/em>\u00a0Resource Community<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The U.S. Environmental Protection Agency (EPA) has not established a Maximum Contaminant Level for\u00a0Legionella\u00a0in drinking water and does not require analysis for\u00a0Legionella.\u00a0 The EPA\u2019s\u00a0Guidance Manual For Compliance With The Filtration And Disinfection Requirements For Public Water Systems Using Surface Water Sources\u00a0states that: treatment requirements for disinfection of a municipal water supply are thought to provide [&hellip;]<\/p>\n","protected":false},"author":596,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_lmt_disableupdate":"no","_lmt_disable":"","footnotes":""},"tags":[],"class_list":["post-40","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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