MarkhamBuilding PermitsPlumbing & Drains

Quick Reference – Backwater Valves

Published by City of Markham

This is the City of Markham’s document, as published on its website on 18 October 2026. The municipality may have changed it since: check the current version at the source. Legal notice

Type: Guide
Published by: City of Markham
Date: June 2020
Also called: Backwater Valves
For: homeowner
Building types: All building types
Pages: 1

Overview

Markham Building Standards' one-page ePLAN quick reference for backwater valve plumbing permit applications, dated June 2020 and listed with the City's ePLAN guides and tutorials; its opening line, carried over from the backflow preventer sheet, still speaks of a backflow preventer. It gives the ePLAN settings, Housing Permit, Plumbing, Fixtures Only and Installation, a project description giving the full plumbing scope, such as a backwater valve and sump pump, the Permit Applicant Authorization Form, and the Technical Review Application and Approval Form from Environmental Services.

What it covers

Submitting an Application
Detailed Information of New Application
Project Description
Submission Requirements
Documents

Check this against the municipality before you rely on it.

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