| 1. WARNING: CT Value Errors
The current and past versions of the MOE's PROCEDURE FOR DISINFECTION OF DRINKING WATER have
errors in the CT value tables. ETI notified MOE January 2001 of the errors and three times MOE reported they had
corrected the detected mistakes. However, the error(s) remain in the latest 2019 version of CT value tables.
The identified error was a truncation of the last digit for all 3 digit CT Values.
That error was found in all copies of the .pdf document downloaded from MOE's website from Aug 2000
to Jan 12, 2001. The incorrect document can be identified as August 2000,PIBS#4065e.
DO NOT use this document for determining CT Values!
A June 4 2006, (second revision) copy is available from the link below for identification. This
contains a different flaw in the CT Table as a result of correcting the previous versions from
January 2001, April 16,2003 and June 1,2003. Pathetically, it remains uncorrected as of May 17, 2020,
the 20th anniversary of Ontario's Walkerton Water Tragedy.
The lastest iteration is still incorrect and no longer a .PDF, but a web page identified by the same title
Updated: April 5, 2019, Published: July 29, 2016. See the 2019 link below.
ETI has consistantly informed Professional Drinking water Treatment Operators about these errors since August 2000.
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