Boil Water Advisories Notification Operating Board Summary

In April 2, 2015, a Boil Water Advisories Notification Operating Board was discussed. The SPU Drinking Water System and a 10-year Regional TCR Summary were also reviewed, highlighting various locations and data trends from 2005 to 2014. Details about TCR Compliance Flow Chart, Timing for Tier 1 Acute MCL Violation, and a section for questions were included in the discussion.

• Water Advisories
• SPU Drinking System
• TCR Summary
• Compliance Flow Chart
• MCL Violation

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1. Boil Water Advisories Notification Operating Board April 2, 2015

2. SPU Drinking Water System

3. 10 Year Regional TCR Summary Name Port of Seattle Bellevue Bothell Skyway KCWD 20 North City KCWD 49 Soos Creek Highline Northshore KCWD 90 Woodinville Cedar River KCWD 119 KCWD 125 Kirkland Mercer Island Seattle Tukwila 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 Grand Total 1 1 5 1 1 4 2 1 1 1 2 2 1 13 2 1 2 1 1 5 4 7 4 1 1 1 2 1 1 1 1 1 1 1 2 1 2 2 1 1 1 3 3 1 1 1 1 1 1 2 1 1 2 1 5 1 2 6 7 6 8 6 0 3 4 47 1 Grand Total 10 15 9 11 12 10 1 4 14 14 100

4. TCR Compliance Flow Chart YES YES YES YES ROUTINE sample TC+? PWS collects required ROUTINE samples? TC+ ROUTINE sample analyzed for FC/EC? PWS collects REPEAT samples within 24 hrs? NO NO NO NO M/R VIOL M/R VIOL M/R VIOL No Further Action Must continue collecting REPEAT samples until all are TC negative or an MCL is violated YES TC+ REPEATS Analyzed for FC/EC? REPEAT Samples TC+? YES NO NO No Further Action M/R VIOL Definitions: ROUTINE TC+ and REPEAT FC/EC+? Or ROUTINE FC/EC+ and REPEAT TC+? Is the percent of ROUTINE TC+ s plus REPEAT TC+ s >5% of total (this is 10 or more samples for Seattle Public Utilities) PWS = Public Water System TC = Total Coliform TC+ = Total Coliform Positive FC = Fecal Coliform EC = E. Coli M/R = Monitoring/Reporting MCL = Maximum Contaminant Level VIOL = Violation NO NO No Further Action YES YES 24hr Acute MCL VIOL Monthly MCL VIOL

5. Timing (Tier 1 Acute MCL Violation) Within 24 hrs Within 24 hrs 24 hrs 24 hrs Collect Routine Sample Routine Result TC+ or EC+ Repeat Result EC+ or TC+ Collect Repeat Samples Issue Public Notice Up to 4 days from 1st sample collection Elapsed Time 0

6. Questions?