Laserfiche WebLink
City of Tukwila My WebLink |HelpSearch Tips |About |Sign Out
$ STAT <br />y <br />r <br />z <br />NORTHWEST DRINKING WATER REGIONAL OPERATIONS <br />20425 72nd Avenue South, Suite 310, Kent Washington 98032-2388 <br />March 30, 2017 <br />1 0 <br />P <br />I to] 21 VITJ I <br />Subject: Tukwila Water Department (ID #89500) <br />King County <br />SWTR Monthly Report: Distribution System Chlorine Residual <br />Dear Pat Brodin: <br />REC1171VI <br />N I fi 0 !3 2 0 17 <br />iifllf al EFi , &'CP <br />The Department of Health has taken a closer look at monthly surface water reports in follow up <br />to waterborne disease outbreaks that have occurred in the United States and Canada. As the <br />manager of a water system that purchases treated surface water you are responsible for <br />maintaining a detectible chlorine residual throughout your distribution system. <br />Previously, we had approved a regional monitoring plan for Seattle Public Utilities to conduct <br />this monitoring on behalf • all of their wholesale systems. This approval has now changed and <br />we are requiring each wholesale customer to conduct the required distribution residual <br />monitoring. <br />Maintaining a chlorine residual is an important protective measure for your system. It can help <br />prevent bacterial regrowth and protect your users from contamination by <br />• Treatment breakthrough, <br />• Leaking pipes, valves, and joint seals, <br />• Cross-connection and backflow, <br />• Unsecured openings in water storage tanks, <br />• Improper treatment of equipment or materials before and during main repair, and <br />• Intentional introduction of contaminants into distribution system. <br />Monitoring the residual on a regular basis helps you to identify problems that might put your <br />system at risk. <br />You have three requirements under the Drinking Water Regulations (see applicable WAC <br />References below): <br />1. measure the chlorine residual within the distribution system on a daily basis and at the <br />same time and location as coliform sampling. <br />Pubfic III lealfli <br />0"4 w Q0 4.8 <br />