Ontario · Amendment

Permit exemption for building foundation dewatering now covers all buildings, not just residential

WATER TAKING AND TRANSFER — under the Ontario Water Resources Act

Recorded date: September 1, 2026
Detected: October 1, 2026. Verify commencement in the official source.

Construction & Real EstateEnergy & EnvironmentMunicipal & Land Use

Plain-language summary · AI-assisted

An exemption from water-taking permit requirements for sewage works that handle groundwater and stormwater from building foundations has been broadened. Previously, the exemption only applied where the building was used, or intended to be used, primarily for a residential purpose. That residential-use restriction has been removed, so the exemption now applies to any building's foundation dewatering system, provided the works take less than 379,000 litres per day and their sole purpose is collecting, transmitting, treating and disposing of that water. Separately, a new exemption has been added for water takings connected to early mineral exploration activities carried out under valid exploration plans or permits issued under the Mining Act, subject to additional conditions. Operators of commercial, industrial or mixed-use buildings with foundation dewatering systems should review whether they now qualify for this permit exemption, and mining exploration operators should check whether the new early-exploration exemption applies to their activities.

Who this affects
commercial and industrial building operators with foundation dewatering systems · residential building operators with foundation dewatering systems · mining exploration companies · sewage works operators · construction project operators near water bodies

Check the official text
O. Reg. 387/04 on the official source ↗ · consolidated version 15 → 0

This page isn't an official version of the law and isn't legal advice. Summaries may omit details. Verify the dates and provisions that apply to you against the official source.

View this law's change history · Follow this law by RSS

Keep up with what changes.

The free weekly digest brings together published changes across our coverage. Confirm your email to subscribe.