1. AWWA 2014 Hexavalent Chromium: Recent Research. www.awwa.org/legislation-regulation/regulations/chemical-contaminants/hexavalent-chromium.aspx#3329298-recent-research
2. [Increasing incidence of] Legionellosis-United States, 2000-2009;CDC (Centers for Disease Control and Prevention);Morbidity and Mortality Weekly Report,2011
3. Department of Health and Hospitals 2013 DHH Issues Emergency Rule Requiring Drinking Water Systems in Louisiana to Raise the Level of Disinfectant in their Water, Increases Monitoring by 25 Percent. www.dhh.louisiana.gov/index.cfm/newsroom/detail/2906
4. Loudoun Water 2014 Potomac Water Supply Program. www.loudounwater.org/Residential-Customers/Potomac-Water-Supply-Program/