Study on pathogen inactivation in drinking water systems in Newfoundland and Labrador

The study included: • An initial desktop evaluation of background information relating to the disinfection of drinking water; • An extensive field program; • The development of a disinfection infrastructure database, CT calculator, and four GIS shapefiles; • An evaluation of the level of compliance with the provincial Standards for the Bacteriological Quality of Drinking Water and recommended disi [...] Topics included the effects of source water quality on pathogen levels; common pathogens found in surface and GUDI water sources; the chemistry of chlorine disinfection; chlorine decay; the development and application of the CT and log reduction concepts; and the formation of disinfection by-products (DBPs). [...] Despite the many successes of the MBSAP, the residents of many of the over 500 small and rural communities in the province still lack reliable access to clean and safe drinking water. [...] The Sustainable Options Report and Best Management Practices for the Control of Disinfection Water Systems in Newfoundland and Labrador, both published in 2009, provide a number of recommendations for the improvement of the design, operation, maintenance, and monitoring of existing small systems to minimize the formation of DBPs while ensuring adequate pathogen inactivation. [...] The deliverables for the project include the Community Disinfection Infrastructure Database (CDID), a disinfection compliance calculation spreadsheet, four GIS shapefiles showing the location and properties of important components of the disinfection and distribution systems in each participating community, and a report summarizing the findings of the study.