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Ontario Water/Wastewater Agency Response Network
What is OnWARN? 

OnWARN is a province-wide Water/Wastewater Agency Response Network (WARN) of "utilities helping utilities" to prepare for the next natural or human-caused emergency.

Why do we need OnWARN? 

Water and wastewater systems provide our communities with a life-sustaining resource that is of vital importance to maintaining public health, sanitation and safety. When water and wastewater services are interrupted for extended periods of time, a community's well-being quickly deteriorates, as evidenced by Hurricane Katrina. Without an adequate water supply, our communities are vulnerable to devastating fires. By restoring water and wastewater service in the most efficient manner possible, OnWARN provides renewed hope for fast recovery from such disasters.

How does OnWARN help? 

OnWARN provides water and wastewater utilities with:
  • A Mutual Aid and Assistance Agreement and process for sharing emergency resources among water and wastewater agencies province-wide.
  • A mutual assistance program consistent with other province-wide mutual aid and assistance programs and the Incident Management System.
  • The resources to respond to and recover more quickly from a natural or human-caused disaster.
  • A forum for developing and maintaining emergency contacts and relationships.
Why Join OnWARN? ​

Who is more likely to have that specialized pump or valve your system needs to get back on line in a hurry? That's right, another water or wastewater system. So join your peers in OnWARN and become part of the network dedicated to keeping our communities healthy, sanitary and safe.

OnWARN Mission 

The mission of the OnWARN network is to support and promote province-wide emergency preparedness, disaster response and mutual aid and assistance for public and private water and wastewater utilities for natural and human-caused events.


The OnWARN Mutual Aid and Assistance Agreement​​ is available to all public and private water and wastewater utilities in Ontario. All actions, recommendations, etc. are made in accordance with the articles of the agreement.

Renewed hope ​

When water and wastewater service is restored, people have a renewed sense of hope that recovery is forthcoming!​




Current Status:

OnWARN is not activated

Follow us on Twitter @InfoOnwarn


 OnWARN Members Area

​​OnWARN Members have access to a "Members Area" page after signing in with their user name and password via the sign in option in the upper right corner.

 OnWARN Reference Materials

OnWARN Presentation.pdfOnWARN Presentation
Joint Policy Statement.pdfJoint Policy Statement
OnWARN Brochure.pdfOnWARN Brochure
OnWARN Mutual Aid and Assistance Agreement.pdfOnWARN Mutual Aid and Assistance Agreement
OnWARN Operational Plan.pdfOnWARN Operational Plan
Member Emergency Contact Information Form.pdfMember Emergency Contact Information Form
OnWARN Activation Form.pdfOnWARN Activation Form
OnWARN Steering Committee Overview.pdfOnWARN Steering Committee Overview
OnWARN Steering Committee Election Nomination Form.pdfOnWARN Steering Committee Election Nomination Form
OnWARN After Action Report.pdfOnWARN After Action Report
Sample Council Reports.pdfSample Council Reports


Find out where all of the current OnWARN Members are located.
EPA has a variety of tools and guidance to support drinking water and wastewater utility preparedness and response.
The US EPA developed this “Background on the WARN Initiative” video.
The US EPA developed this "WARN Tabletop Exercises" video.
Ontario offers two programs that provide financial assistance following sudden, unexpected natural disasters: Disaster Recovery Assistance for Ontarians and Municipal Disaster Recovery Assistance.