The City of Toronto has developed proposed guidelines for Manufactured Treatment Devices (MTDs). MTDs are proprietary devices used in stormwater management to treat and remove pollutants from stormwater runoff.

The proposed MTD Guidelines are intended to provide guidance for consistent MTD selection, design, and review, taking into account the following key drivers and challenges:

  • The emergence of new and varied proprietary and removal technologies.
  • Advancements in third-party testing procedures, verification and certification processes for performance claims.
  • Changes and constraints related to existing municipal and provincial approvals.
  • Constraints related to municipal operations, maintenance and asset management.

The proposed MTD Guidelines were developed following an extensive review of existing practices across Canada and the U.S., with expert feedback and input from stakeholders including provincial and local regulatory bodies, third-party testing and verification agencies, manufacturers and review engineers.

The City of Toronto plans to finalize and release the new MTD Guidelines in 2021. Once released, the new MTD Guidelines will apply to all new and revised Stormwater Management Reports submitted to the City of Toronto.

Until the new MTD Guidelines are in effect, the City of Toronto’s Wet Weather Flow Management Guidelines (2006) (Appendix B) continues to apply.

The City continues to recognize the use of Oil/Grit Separator (OGS) devices that are certified by the New Jersey Department of Environmental Protection (NJDEP). In addition, the City of Toronto continues to recognize higher removal performance claims for filter devices, if they are supported by field-tested performance data verified under the Technology Acceptance and Reciprocity Program (TARP) Tier II Testing Protocol. As such, performance claims from previous NJDEP-certification which were verified under the TARP Tier II Testing Protocol also continue to be recognized.

The City of Toronto neither requires, specifies, nor approves individual MTD products or brands. Rather, the City reviews and accepts, where appropriate, Stormwater Management Reports prepared by design engineers (i.e., Professional Engineers) on behalf of their respective clients/owners (and not from MTD manufacturers or suppliers). The choice of a MTD in a Stormwater Management Report is solely at the discretion of the design engineer and/or their respective clients/owners.