A recent decision of the Superior Court of Justice considered whether the Court, at the behest of a private citizen, could compel a regulatory authority to take enforcement action against another private citizen when the regulatory authority had failed to do so on its own. In the case before the Court, a local Conservation Authority had issued a permit to landowners to build a residential dwelling on their property. The permit application included a grading plan that addressed stormwater management on the property through an existing swale. When the landowners applied to the Municipality for a building permit, a different grading plan featuring a retaining wall rather than a swale was proposed. The building permit was granted and the Conservation Authority was not notified of the grading plan change and a revised permit from the Authority was not sought.
Following construction of the residence, including the retaining wall, an immediate neighbour of the landowners notified the Conservation Authority of the deviation from the original grading plan. The neighbour was concerned that the historic grading of the landowners’ property included the swale that directed water between the landowners’ property and the neighbour’s property. The retaining wall now blocked movement of water from the neighbour’s property onto the landowners’ property.
The Conservation Authority conducted a site visit and confirmed that the lot grading did not follow the approved permit. The Authority notified the landowners that the property was in violation of the permit. The landowners then submitted an updated site plan with a letter from a Professional Engineer stating his opinion that the revised grading plan was in conformity with the Municipality’s design criteria. The Conservation Authority reviewed the additional information and ultimately determined that the construction undertaken by the landowners on their property satisfied the requirements of the Conservation Authorities Act and regulations.
The Authority notified the neighbour in writing that it was satisfied that the landowners’ construction work complied with the legislation and that no enforcement action would be taken. The neighbour applied to the Court for an order compelling the Conservation Authority to direct the landowners to comply with the Authority’s original permit. The Authority opposed the neighbour’s application. The landowners were not parties to the application.
In considering the neighbour’s request, the Court first reviewed whether the Conservation Authority has the legal authority to order the landowners to comply with the permit. The Court found that there was nothing in the Conservation Authorities Act that provided the Authority with the power to issue an order requiring compliance with the permit now that the construction was complete. The Court noted that a Conservation Authority is a “creature of statute”. Whatever authority the Conservation Authority does have must be found in legislation or regulations. While the Conservation Authority could have issued a stop work order prior to the completion of the work, such an order would now be moot.
However, the Conservation Authority could charge the landowners with an offence under the Conservation Authorities Act for failing to abide by the conditions of the permit. Although the Court decision does not refer to this, if the landowners were prosecuted and convicted of having failed to comply with the permit, the Court would have the authority to order the landowners to take corrective action. That corrective action could include removal of the retaining wall and restoration of the swale. The Court found that the exercise of enforcement tools by the Authority, whether a stop work order or a prosecution, is discretionary.
The Court then considered whether it should review and modify the Conservation Authority’s discretionary decision not to pursue action against the landowners. The Court accepted that the neighbour, whose property was potentially affected by stormwater runoff from the landowners’ property, was an interested person who had standing to ask the Court to intervene. The test to be applied on the review of the action (or inaction) of the Authority is one of reasonableness – “the reviewing court must consider only whether the decision made by the administrative decision maker – including both the rationale for the decision and the outcome to which it led – was unreasonable.” The onus was on the neighbour to establish that the Conservation Authority’s decision not to pursue enforcement action was unreasonable.
The neighbour’s request for review was denied. The Court found that the Conservation Authority had provided its reasons to the neighbour for not pursuing enforcement action, which is usually a requirement for a decision to be reasonable. The Authority had explained to the neighbour that staff had reviewed the updated grading plan and determined that it addressed stormwater and drainage on the landowners’ property and was in conformity with the legislation. The Court did not go behind those determinations. The question for the Court on review was whether the decision not to take enforcement action was reasonable. The Court concluded that the decision not to enforce, which was a discretionary decision to be made, was reasonable and did not override any mandate of the Conservation Authority: “The mandate to act in accordance with public safety and environmental protection does not require conservation authorities to act in every instance where there is non-compliance with conditions of a permit.”
Read the decision at: 2026 ONSC 60 (CanLII).



