Wednesday, October 26, 2022 from 8:30 AM to 12:00 PM PDT
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Covington Water District 
18631 SE 300th Place
Covington, WA 98042

Driving Directions 


Chris Guest 
AWWA King County Subsection 

Chlorine Residual Testing and Lab Skills Workshop


Wednesday, October 26, 2022

8:30-12:00 - Morning Session

Doors open at 8:00 for Morning registration and coffee

Please be aware this is the first of two independent sessions.  Look for the afternoon session if this event is full.  Here is a link to the Afternoon session:

1:00-4:30 - Afternoon Session

Attend either one of these 3.5 hour workshops for chlorine residual testing.  Each class will provide drinking water operators with a better understanding of good lab skills and chlorine measurement techniques and why they matter.

It will provide operators with hands on skills to answer the questions:

  • How do I know my instrument is working?
  • How do I know that the residual that I measure is real?
  • How good is my technique?

Each workshop size is limited to 20 students.  The goal of the workshop is to increase water data accuracy and consistency. 

This is a hands on class with five separate activites - attendees must bring a chlorine test kit and all supplies needed to measure chlorine residual, including extra batteries for your instrument.  Bring your standards if you have them for comparison.

This training is being taught by Office of Drinking Water staff to provide increased training as recommended by the Disinfection Data Integrity Project (2015).  The Yearlong study investigated disinfection measurement, recording, and reporting practices in 33 water treatment plants located in the northwest region of Washington State.  Deficiencies were identified in all 33 treatment facillities that affect the accuracy of the calculated pathogen inactivation achieved by the disinfection processes.  Pathogen inactivation level errors of over 100% were identified when more accurate data was used.

This study highlighted challenges involved with ensuring accurate water quality measurements.


Cost is $60 per attendee for individual or utility members of AWWA, WEF or PNCWA 

$90 per attendee for non-members 

Fee includes coffee/sodas and refreshments

If you have a Washington Water Operator, please make sure you register with your proper name and certification number.