Executive Summary: Key Legal and Evidentiary Issues

• Timeliness of the owner’s recourse against the municipal borrowing and special tax by-laws, in light of presumed legal knowledge of regulations and possible “assouplissement” when the taxpayer only learns of them later.
• Reliance by the municipality on a declaration in the land purchase contract, and whether a clause given by a third-party seller can bar or render irreceivable a judicial challenge against the City’s by-laws.
• Alleged unreasonableness of the special tax scheme, including the 30% cost share allocated to the plaintiff’s sector, given that the final sewer project differed substantially from the initial plan used to justify that percentage.
• Technical and factual evidence about sewer network configuration, densification, and the plaintiff’s much lower construction density, showing that its buildings did not materially contribute to the need for additional capacity.
• Interpretation and application of section 244.3 of the Loi sur la fiscalité municipale, particularly the requirement that a special user-fee type tax confer an actual or at least eventual individual benefit on each charged taxpayer.
• Determination that any benefit to the plaintiff from the increased sewer capacity was negligible or purely theoretical over the ten-year term, justifying a declaration of inopposability and an order for reimbursement of taxes paid.

Factual background
Habitat 2000 Inc. is a private owner and developer of residential rental buildings in the Ville de Vaudreuil-Dorion. It owns immovables in a sector that had previously been rezoned to allow substantial densification, up to 300 dwelling units per hectare. The City was aware at the time of this zoning change that the existing sewer network would eventually be insufficient to handle the increase in wastewater flows generated by denser construction. In practice, however, Habitat 2000 built at a much lower density—about 61 units per hectare—meaning that its buildings contributed far less to system load than the maximum contemplated when the zoning was amended. The sector where Habitat 2000’s immovables are located is served by a “separated” sewer system, which carries domestic wastewater only, while other sectors of the municipality are served by “pseudo-domestic” sewers that also carry stormwater. The latter generate much higher peak flows and are therefore more sensitive to capacity constraints.
To address capacity concerns and support future development, the City planned major sewer works. An initial project involved building a new sewer line on a different alignment, adding pumping stations to discharge wastewater to a collector sewer. Under this first scenario, the new facilities would largely have been located in the sector of Habitat 2000’s properties, and Council discussions at the plenary committee stage fixed that 30% of the project’s cost would be charged as a special tax to owners in that sector, with the remaining 70% borne by all municipal taxpayers. Subsequently, however, the City abandoned this initial scheme and opted for a different technical solution: doubling the existing sewer line along another alignment, with no additional pumping stations, and routing the flow to an existing pumping station in a different sector, which was rebuilt and significantly upgraded in capacity. Despite this reconfiguration, the original allocation of 30% of costs to Habitat 2000’s sector was never revisited before adoption of the borrowing by-law.
The borrowing by-law no. 1731, adopted on 16 April 2018 and in force as of 1 June 2018, and its amending by-law 1731-1, adopted in May 2020 to increase the borrowing by nearly $3 million, implemented this cost-sharing scheme. A special tax was imposed on the plaintiff’s sector, keyed to the increased number of potential dwellings made possible by earlier zoning changes.

Municipal by-laws and taxation framework
The challenged charges were characterized as a special “tarification” tax adopted under the Loi sur la fiscalité municipale. The key statutory provision, section 244.3, provides that the mode of user-fee taxation must be linked to the “bénéfice reçu” (benefit received) by the debtor. It specifies that benefit is present not only when the taxpayer or a related person actually uses the service, but also when the service is at the taxpayer’s disposal or is susceptible to benefit them or the immovable eventually, over the life of the measure. The municipality accepted that a special tariff must confer some benefit on each payer but argued that the benefit need not be direct or immediate; it may be eventual or potential. It invoked appellate jurisprudence, including Dagenais c. St-Adolphe-d’Howard, to support the idea that the notion of benefit is broad and encompasses indirect or prospective advantages. The City also stressed that it was assuming 70% of the project cost from the general tax base, portraying this as proof that the cost allocation was not unreasonable or abusive.

Procedural history and preliminary issues
Habitat 2000 purchased its lot in July 2018, after by-law 1731 had come into force. It did not, however, become aware of the borrowing by-law and related special tax until April 2022, when it received an “offer of lump-sum payment” from the City, a standard mechanism allowing taxpayers subject to a special tax to pay it in one instalment rather than via annual tax bills. Prior to that, there had been discussions between representatives of the plaintiff and the City about another special tax concerning preparation of the street fronting the buildings, but the City never disclosed the existence of the sewer-related borrowing by-law. Habitat 2000 had even requested information from the City on applicable taxes, but the municipality refused to provide it, noting that it was under no legal obligation to do so.
On 5 May 2022, within roughly 30 days of actually learning of the borrowing by-law, Habitat 2000 brought proceedings. It sought, first, a declaration of nullity of by-laws 1731 and 1731-1 on the ground that the decision-making process and resulting allocation of costs were unreasonable. In the alternative, it sought a declaration that the by-laws were inopposable to it, arguing that the statutory requirement of individual benefit for a user-fee-style special tax was not met in its case.
The City raised several preliminary defences. It argued that the action was out of time under the principles articulated by the Supreme Court of Canada in Lorraine (Ville) c. 2646-8926 Québec inc., where citizens are presumed to have legal knowledge of municipal regulations from the date of adoption and must challenge them within a “délai raisonnable”. It contended that allowing late challenges would jeopardize municipalities’ financial stability by forcing them to refinance long-completed projects. The City also relied on a clause in the plaintiff’s land purchase contract in which Habitat 2000 declared that it had obtained all relevant information from municipal authorities, suggesting that this contractual declaration rendered the recourse irrecevable because the buyer was presumed to know of the borrowing by-law.
The Superior Court addressed these issues in sequence. First, on delay, it recognized that Lorraine applies both to actions in nullity and in inopposability and incorporates a presumption that citizens know municipal by-laws as of their adoption. However, the Supreme Court had left open some flexibility—“assouplissement”—regarding inopposability. The trial judge referred to two more recent Superior Court decisions (Société québécoise des infrastructures c. Ville de Lévis and Boutique de golf Gilles Gareau inc. c. Ville de Saint-Colomban), which had extended the usual 30-day time frame to about 18 months in exceptional circumstances. In those cases, municipal representations and the absence of immediate impact on the taxpayer’s rights justified the longer delay.
Here, while the time from adoption of the first by-law to the filing of the action was about four years, the Court emphasized that Habitat 2000 instituted proceedings within roughly 30 days of actual knowledge. The City’s reluctance or failure to inform the plaintiff of the special tax, despite discussions and information requests, was treated as analogous to misleading or incomplete representations. On that basis, the judge excused the delay, but only for the alternative remedy of inopposability, noting that such a declaration affects municipal finances less drastically than outright nullity of the by-laws. As for the contractual clause in the deed of sale, the Court held it could not assist the City, because the municipality was not a party to that contract and could not rely on a third-party stipulation to bar a challenge to its own regulatory acts.

Reasonableness of the borrowing by-laws
The main front-line remedy sought by Habitat 2000 was a declaration that the by-laws were unreasonable and therefore invalid. The plaintiff argued that the 30% cost share had been fixed on the basis of an initial project that was never built and that the final project configuration chiefly benefited other sectors of the city, particularly those with pseudo-domestic sewers that also carry stormwater. The argument emphasized that the final works—doubling an existing sewer line in a different sector and upgrading a pumping station there—primarily addressed capacity issues caused by large combined flows (domestic and pluvial) from those areas, not from the plaintiff’s separated-sewer sector.
Evidence showed that at the plenary committee stage, where councillors discuss and prepare the decisions later formally adopted in Council, it was the initial project that was presented, and it was then that the 30% share for the plaintiff’s sector was decided. When the technical plan changed significantly, that 30% apportionment was never revisited. The City’s director general acknowledged in testimony that the percentage remained fixed despite the redesign. Habitat 2000 further pointed to an increased “niveau de service” used for design—moving from a two-week return period to a five-year standard—arguing that the City simply used the opportunity of the works to raise the overall level of service, a change not specifically tied to the plaintiff’s sector.
Nonetheless, the Court recalled the deferential standard applicable to review of municipal by-laws, drawing on the Supreme Court of Canada’s decision in Catalyst Paper Corp. c. North Cowichan (District). Municipal councils enjoy a broad discretion in delegated legislation; they must make policy choices with social, economic and political dimensions, and courts should intervene only when decisions fall outside the range of reasonable outcomes. In that light, the judge emphasized that the whole process had been triggered by densification in the plaintiff’s sector (and one other sector that ultimately was not included) and that the City and its general taxpayer base were assuming 70% of the costs, a factor repeatedly underlined by the City’s counsel. Taking these elements together, the Court concluded that while the process was imperfect, the outcome did not meet the high threshold of unreasonableness required to strike down a municipal by-law. The claim for nullity was therefore rejected.

Assessment of benefit and inopposability
The alternative claim invited a different analysis, focusing on whether the special tax regime complied with section 244.3’s “benefit” requirement as applied to Habitat 2000 individually. The City accepted that the evaluation of benefit had to be done taxpayer by taxpayer, not merely at the level of the sector as a whole. The evidence was clear and uncontested that Habitat 2000’s buildings, constructed at only 61 dwellings per hectare instead of the permitted 300, contributed minimally to any increase in wastewater volume that might justify major capacity upgrades.
The Court revisited the language of section 244.3 and the jurisprudence, including Dagenais, which recognizes that benefit may be eventual and not strictly limited to direct and immediate advantages. The municipality argued that the added capacity put the plaintiff’s properties in a position to support more intensive development in the future, or to benefit a successor owner who might redevelop at higher density, and that this potential was enough to satisfy the statutory test.
However, following the reasoning adopted by the Superior Court in Ville de Lévis, the judge placed significant weight on the age and characteristics of the buildings. They were recent constructions, making it highly unlikely that they would be demolished and replaced with substantially denser buildings during the ten-year term of the borrowing by-law. Given that limited time horizon, the theoretical possibility of future densification was too remote. The Court found that any benefit to Habitat 2000 from the increased sewer capacity was negligible and not realistically “susceptible” to materialize within the period for which the special tax would be levied.
On that basis, the judge held that the legal condition for a user-fee-type special tax—that the taxed debtor or its immovable receive an actual or at least plausible eventual benefit—was not met in the plaintiff’s case. The appropriate remedy was not to strike down the by-laws generally, but to declare them inopposable to Habitat 2000. This preserved the overall financial scheme for other taxpayers while protecting the plaintiff from a charge that, in substance, conferred no meaningful benefit on it or its buildings.

Outcome and financial consequences
In the result, the Superior Court partially allowed Habitat 2000 Inc.’s application. It declined to annul the municipal by-laws, finding that the cost allocation of 30% to the plaintiff’s sector, though decided under an earlier project concept and never revisited, did not rise to the level of unreasonableness that would justify invalidation in light of the broad discretion afforded to municipal councils. At the same time, the Court accepted that, under section 244.3 of the Loi sur la fiscalité municipale, a special user-fee-type tax must confer at least a realistic eventual benefit on each individual taxpayer charged, and that Habitat 2000, given its low-density, recently built projects, derived no more than a negligible or hypothetical advantage from the sewer capacity increase.
The Court therefore declared the borrowing by-laws 1731 and 1731-1 inopposable to Habitat 2000 Inc. and ordered the City of Vaudreuil-Dorion to reimburse the plaintiff for all special taxes it had paid under those by-laws, together with interest and the statutory additional indemnity from the dates of payment, and with costs of justice. The judge expressly reserved jurisdiction to determine the precise quantum in case of disagreement between the parties. The successful party is thus Habitat 2000 Inc., but the total monetary amount of the award—tax reimbursements, interest, indemnity and costs—cannot be determined from this judgment alone, as the sums are not specified and may depend on subsequent calculation or agreement.