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Everything you need to know about the updates to the Ontario 'Draft Land Use Compatibility Guidelines'

On May 4, 2021, the Ontario Ministry Of The Environment, Conservation And Parks (“MECP”) issued a Draft Land Use Compatibility Guideline (“the Draft Guideline”) on the Environmental Registry of Ontario website (https://ero.ontario.ca/notice/019-2785).  Comments on the draft guideline are open until July 3, 2021. 

The Draft Guideline is intended for use by “Planning Authorities” (including Municipalities, the Ontario Land Tribunal, and Ministerial Zoning Orders), developers and consultants in land use planning assessments, and to replace the former “D-Series” Guidelines D-1, D-2 (Sewage Treatment), D-4 (Landfills), and D-6 (Industry).  

The requirements in the Draft Guideline differ from the previous D-Series requirements in important ways and will add new assessment requirements for development in general and significant new hurdles for redevelopment, infill and brownfield developments as well as transitions to mixed uses. 

New Areas of Influence and Minimum Separation Distances

The guideline supplies new Areas of Influence (AOIs) and Minimum Separation Distances (MSDs).  Values are provided for specific industrial types in Table 1 of the Draft Guideline.  For industries not included in the Table 1 list, Table 2 and Table 3 provides guidance on establishing classifications.

There are now 5 categories of industries, rather than the 3 in the existing Guideline D-6 document.  No rationale is provided for the increased number of categories, and as only 3 different MSDs are provided, the additional complication appears to be superfluous.

The AOI and MSD distances are in the vast majority of cases significantly larger than those in the D-Series guidelines, with AOIs for “Class 5 Heavy” industries extending out to 2 km (up from the 1 km in Guideline D­6), with a corresponding MSD of 500 m (up from 300 m).  The increased separation distances are said to have been developed from the MECP’s records of complaints; however, this information has not been provided, and it uncertain if data used are representative of typical industrial activity, rather than industrial “bad actors”.  They are certainly inconsistent with the experience of SLR.

New Role for AOIs and MSDs

Section 1.1 of the Guideline states that “The primary purpose of the Guideline is to support the implementation of the Provincial Policy Statement, 2020 (PPS)”.  Policy of the 2020 PPS introduced the concepts of “avoidance” and “demonstration of need”:

“1.2.6 Land Use Compatibility       Major facilities and sensitive land uses shall be planned and developed to avoid, or if avoidance is not possible, minimize and mitigate any potential adverse effects from odour, noise and other contaminants, minimize risk to public health and safety, and to ensure the long-term operational and economic viability of major facilities in accordance with provincial guidelines, standards and procedures.       Where avoidance is not possible in accordance with policy, planning authorities shall protect the long-term viability of existing or planned industrial, manufacturing or other uses that are vulnerable to encroachment by ensuring that the planning and development of proposed adjacent sensitive land uses are only permitted if the following are demonstrated in accordance with provincial guidelines, standards and procedures:

  1. there is an identified need for the proposed use;
  2. alternative locations for the proposed use have been evaluated and there are no reasonable alternative locations;
  3. adverse effects to the proposed sensitive land use are minimized and mitigated; and
  4. potential impacts to industrial, manufacturing or other uses are minimized and mitigated.”

Areas of Influence (AOIs)

Areas of Influence, or AOIs are now defined as an area where “adverse effects on surrounding sensitive land uses have a moderate likelihood of occurring”.  Similar to the previous D-Series of guidelines, detailed Compatibility Studies are required where sensitive land uses are proposed within an AOI of an industry; or where a sensitive land use exists within the AOI of a new or expanded industrial use.  “Avoidance” is only met if the sensitive use is outside of all applicable AOIs in a given area.

Given the increased AOI distances, any development project within a metropolitan area are therefore unlikely to “avoid” a major industry.  Therefore, the number of Compatibility Studies, and the number of industries which will need to be considered in a Compatibility Study will dramatically increase, affecting the timing and cost of studies. 

What is new is the requirement for a “Demonstration of Need Study” (“Need Study”) if any form of mitigation (either source or receptor-based) is required as a result of the Compatibility Study.  Issues with Need Studies are discussed further below.

Minimum Separation Distances (MSDs)

Minimum Separation Distances, or MSDs are defined as the “recommended minimum distance from a major facility within which adverse effects to a sensitive land use are highly likely to occur”.  The guideline further states that “Planning authorities should not allow sensitive land uses within the MSD.”  However, this is a recommendation, and development within the MSD is allowed, subject to a Demonstration of Needs Study.

Given the increased MSD distances, Needs Studies will likely be required for the vast majority of developments within metropolitan areas.

Demonstration of Need Studies

The requirement for a Needs Study is triggered by either a) if mitigation is required to address impacts from an industry within its AOI; and b) if a development is proposed within the MSD.  This is a brand-new requirement with no parallel in the previous guidelines or policies, which is discussed in detail in Section 2.8 of the Draft Guideline.  The requirements are all related to planning matters, not technical assessment matters, and thus would appear to be outside of the MECP’s mandate and area of responsibility. 

These assessments are only required for sensitive use development projects, and not for industrial projects.  The Draft Guideline states that “… the planning authority must only permit the proposal if they are satisfied that there is an identified need and sound planning rationale for the proposed use in that location, and that alternative locations or areas for the proposed use have been evaluated and there are no reasonable alternative locations or areas”.

From the Draft Guideline:

“The demonstration of need should include the following:

  1. Demonstrate that there is a need for the proposed use in that particular location. This includes answering the following questions:
    1. Do policies and objectives in the planning authority’s applicable planning documents (such as OPs) and relevant provincial policies and plans (e.g. PPS, A Place to Grow) support locating the use in the proposed location? For example, consider policies/objectives related to complete communities, housing diversification, and community amenities.
    2. Are there demographic considerations, such as expected land supply, housing strategy, and forecasted growth or growth targets in population or employment, that would support the use in the proposed location?
    3. How will the proposed use, in its proposed location, support the community or other existing uses in the area? For example, does it provide necessities for daily living, including an appropriate mix of jobs, local stores, and services, a full range of housing and transportation options and public service facilities?
    4. Are there community amenities and infrastructure (i.e. transportation, servicing) available to support the use?
    5. Is the proposed use to be located within a designated strategic growth area which by nature should include multiple types of uses, such as an MTSA (within the Greater Golden Horseshoe growth plan area) or nodes and corridors generally?
  2. Identify other locations in the municipality that have been designated and zoned specifically for this use and explain why they have not been chosen for the proposed use.
  3. Provide a list of at least two alternative locations that have been considered outside of the major facility’s AOI and for each, discuss whether they would be appropriate for this use as compared to the preferred location. This discussion should address the same questions presented in #1a-e.
  4. Identify other potential uses for this particular site that would not be considered incompatible and explain why they have not been chosen for the proposed location.
  5. The conclusion of the demonstration of the need should discuss why the proposed use in the proposed location is the best option, having considered the answers to the questions presented in #1a-e.”

Items 1a to 1e include information typically found in a Planning Justification Report.  However, under items 2 to 5, planning and compatibility issues for at least two additional sites, which may have to be several kilometres away (“outside of outside of the major facility’s AOI”) would also need to be fully assessed.  While we are not Planners, it appears that the scope of required planning studies will dramatically increase as a result of the proposed Draft Guideline, affecting the timing and cost of studies. 

Timing of Studies

The D-Series of guidelines only applied when a change in land use was proposed, that is to say during Official Plan Amendments (“OPAs”) or Zoning By-law Amendments (“ZBAs”).  The requirements of the new Draft Guideline would apply to all Planning Act approvals including:

  • OP and OP amendments (OPAs);
  • Secondary plans;
  • Community planning permit systems;
  • Zoning by-laws and zoning by-law amendments;
  • Plans of subdivision or condominium;
  • Consents;
  • Minor variances; and
  • Site plan control and other planning approvals.

Under the Draft Guideline as written, a full assessment, including requirements for Need Studies, would be required for every approval.  This places an unfair burden on development.  The zoning of a property alone would no longer be sufficient to determine if development could occur.  If a proposed sensitive land use is within an MSD of an industry, even though the appropriateness of a land use might have been established at the OP and ZB stage, at Site Plan Approval a Needs Assessment would still need to be completed. 

Cumulative Impact Assessment

In general, with the exception of certain air quality contaminants in certain geographical areas (Sarnia and Hamilton), the MECP does not require cumulative impacts assessments, looking at total concentrations from multiple sources.  The Draft Guideline states that “the planning authority can also, at their discretion, undertake or require broader studies outside of a site-specific study, such as regional or cumulative impact modeling. This could be appropriate if there are multiple existing major facilities or multiple proposals for potentially incompatible development in a regional area, and the planning authority may want to assess impacts on an area-wide scale.

SLR agrees that regional or cumulative impact assessments, where warranted by the nature of the contaminants or by the nature of the sources, may be appropriate.  However, leaving these requirements for such studies up to Municipalities is not appropriate, given the lack of MECP guidance and air quality standards.

Transportation Sources

The definition of “major facility” in the Draft Guideline includes transportation corridors such as roadways and railways, which implies that impacts from these sources must be assessed.  While impacts from such sources have always been part of environmental noise and vibration assessments, air quality impacts have typically not been assessed for individual developments, as transportation air quality impacts are generally more appropriately examined and addressed on a regional basis.[1]  

Transportation-related air quality contaminants include items such as fine particulates (PM10 and PM2.5).  In most metropolitan area existing ambient background concentrations of these contaminants already exceed interim MECP standards and guidelines, which would imply that no development would be acceptable in a metropolitan area from an air quality perspective. 

No specific air quality guidelines, assessment techniques, or acceptable mitigation measures are provided in the Draft Guideline.  The Draft Guideline states that Environmental Assessments (“EAs”) which may (or may not) have been completed for the roadways or railway projects should be reviewed, but then goes on to say such information may not be relied upon. 


Section 3 of the Draft Guideline discusses mitigation measures.  The document introduces uncertainty around receptor-based mitigation measures for dust and odour.  Examples of receptor-based air quality measures are provided, including:

  • protection of indoor air quality through centralized heating/air conditioning systems with air intake appropriately located away from odour sources;
  • individual heating/air conditioning systems associated with each residential unit equipped with carbon filters; and
  • locating air intakes well above grade.

These techniques are often used for development projects to reduce the potential for adverse effects, including those for transportation-related air pollution.  However, the guideline then goes on to state “At-receptor mitigation is not recognized by the Ministry to mitigate odour and dust impacts.” 

Ministry Role

As noted in the Draft Guideline, MECP will not review or approve technical studies for Municipalities.  

Potential Effect on Developers and Municipalities

The effect on Developers and Municipalities are potentially significant:

  • Official plans and zoning by-laws may need to be rewritten to address the requirements of the Draft Guideline and the increased AOIs and MSDs.
  • The guideline recommends that Municipalities create an OP schedule identifying AOIs from known industries in their municipality.
  • Compatibility Studies will be required for most projects, and for all Planning Act applications, increasing costs for Developers and review time for Municipalities, affecting already overworked staff.
  • The zoning of a property alone would no longer be sufficient to determine if a development could occur.  Plans of Subdivision and Site Plan Applications would still be subject to Need Studies, which could deny the development.  This would adversely effect land values.

Potential Effects on Industries

Under the Draft Guideline, any industrial expansion which triggers the need for a planning approval, such as a Site Plan Application, would now be required to submit a detailed Compatibility Assessment to the Municipality, as well as any required Environmental Compliance Approval (”ECA”) applications or Environmental Activity and Sector Registry (“EASR”) registrations.  It is uncertain if the MECP will require such documents/ approvals to be supplied as part of their review.  This could add delays in MECP approval of projects. 

Transition and Next Steps

The MECP intends on finalizing the Draft Guide by Q4 2021 or Q1 2022. The Ministry has not committed to providing an additional draft for review prior to finalizing. 

There has been no guidance provided on transition to the new requirements.  There needs to be a very clear transitioning plan put in place, as to when these guidelines come into effect, to allow municipal, industrial and development sectors to realize current investments and be able to make informed, risk reduced, investment decisions as the guidelines come into effect.



[1] Some Municipalities such as Toronto and Halton Region have begun requesting that an assessment of “Transportation Related Air Pollution” (“TRAP”) be included in some but not all Development applications, depending on the setback to major transportation corridors.  The lack of guidelines, assessment techniques, and acceptable mitigation measures already affects these projects.  The Draft Guideline seemingly extends this requirement and resulting uncertainty to all development projects in Ontario.


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