Watermain Disinfection Procedure

A decorative image of the Ontario Logo.

This document outlines procedures for disinfecting water mains as part of an addition, modification, replacement, extension, planned maintenance, or emergency repair in a municipal residential drinking water system. The procedures are required to be followed in order to satisfy conditions imposed by the Director in a drinking water works permit. (MECP, 2020)’

Visit our online library’s main webpage to find more resources on topics related to drinking water.


2020 Watermain disinfection procedure

Watermain Disinfection Procedure Questions and Answers – February 19, 2021

Request for Early Implementation of the Watermain Disinfection Procedure, dated August 1, 2020 (Municipal Residential Drinking Water Systems)

2015 Watermain disinfection procedure