Plaintiffs, owners of a restaurant in the Town of Rut-land, appeal from a decision of the superior court declaring that defendant City of Rutland has authority to impose and collect from them a one-time hookup fee for connecting to the City’s sewage disposal system. We affirm.
The parties have stipulated to the facts. The City of Rutland owns and operates a sewage disposal facility. In 1973, the City entered into an agreement with the Town of Rutland to take and treat up to 55,000 gallons of town sewage per day from a town line which hooks into the city system. User rates were calculated on the amount of water used, and the City retained final authority to approve all future connections to the town sewer line.
In 1984, the City commenced work on expanding its treatment facilities, and entered into a new agreement with the *399 Town. That agreement established three user rates: (1) city users would be charged a “basic” rate related to water usage and operating costs; (2) current town users would be charged five times the basic rate; and (3) new town users would be charged five times the basic rate plus an ad valorem fee equal to 20% of the property tax levied by the Town on the property. The agreement further provided that during the interim period between the signing of the agreement and the completion of the new treatment facility, the City was free to negotiate any rate “it deem[ed] appropriate” with new town users.
Plaintiffs began operating a restaurant in the Town of Rut-land during the interim period in March of 1986. In June of 1985, plaintiffs’ predecessor in title had applied to the City’s board of aldermen for approval to hook up to the city sewer lines. The board, referred the matter to the intermunicipal agreement committee (IAC), which stated that it would recommend approval of a sewer contract for the restaurant after negotiation between the restaurant and the city attorney and resubmission of that contract to the IAC. There was no discussion of a one-time hookup fee.
In the fall of 1985, the city attorney called plaintiffs and advised them that their hookup had been approved, but that it would not be cheap — possibly costing as much as five times the city rate plus an ad valorem tax. He further advised plaintiffs that there was nothing for them to do at that point, and that he would contact them again to sign some papers. At the end of the conversation, the city attorney was under the impression that plaintiffs would contact him to sign an agreement when the hookup occurred. Plaintiffs’ understanding was that the city attorney would contact them regarding the final sewer use rate. Sometime after that conversation and before plaintiffs’ restaurant opened for business in March of 1986, plaintiffs hooked up to the city sewer line.
Two or three weeks after the restaurant opened, the new city attorney told plaintiffs that their hookup was unauthorized. He stated that the board of aldermen would probably charge the new town rate, but that some board members also wanted a one-time hookup fee. After several negotiating sessions and IAC meetings, the board of aldermen approved a hookup fee of $10,170, which represented $1.00 for each gallon per day allowed by plaintiffs’ Act 250 permit.
*400 Plaintiffs refused to pay the one-time hookup fee and filed suit in superior court to stop the City from imposing it. Plaintiffs claimed that the fee was not authorized by state statute and that imposition of the fee constituted an antitrust violation. The City counterclaimed to force plaintiffs to unhook and pay treble damages for the unauthorized hookup. The superior court held that the hookup fee was legal, but that the City was estopped from asserting that the hookup was without approval because the former city attorney had apparent authority to inform plaintiffs of the City’s final approval. On appeal, plaintiffs reassert the arguments made before the trial court, and contend that the court erred by not considering whether the representations of the former city attorney estopped the City from charging the hookup fee.
I.
Plaintiffs first argue that the trial court’s conclusion that the City has the statutory authority under 24 V.S.A. § 3615 to charge a one-time hookup fee for sewer service was erroneous. We disagree.
Both parties concede “that, absent a home rule constitutional provision, a municipality has only those powers and functions specifically authorized by the legislature, and such additional functions as may be incident, subordinate or necessary to the exercise thereof.”
Hinesburg Sand & Gravel v. Town of Hinesburg,
Plaintiffs rely heavily on
Kirchner v. Giebink,
Kirchner
does not oblige us to conclude that the hookup fee in this case is not authorized. We first point out that in the present case the City imposed the hookup fee only when new interim users wanted to connect to the sewer system, not against all existing residences in the “improved” service area, as was the case in
Kirchner.
See
Haymes v. Holzemer,
Plaintiffs cite to the disparate treatment of other interim users as evidence that the imposition of their $10,170 hookup fee was inequitable and discriminatory. Specifically, plaintiffs point out that two pre-existing users, Howard Johnson’s and Holiday Inn, applied during the interim period for additional allotments, and that the City approved the allotments but charged the new business rate (five times the basic rate plus an ad valorem charge) without a hookup fee. Although we agree that the City may not impose inequitable or discriminatory sewer rates, plaintiffs have not shown discrimination here. Unlike plaintiffs, Howard Johnson’s and Holiday Inn were pre-existing users who had already contributed to the sewer system and who were seeking merely to increase their sewage capacities. It was not inequitable or discriminatory for the City to charge these dissimilarly situated applicants different rates.
3
Cf.
South Shell Investment v. Town of Wrightsville Beach,
Although the trial court stated that § 3615 does not require that the City’s sewer charges be reasonable and that the City is
*403
under no obligation to offer reasonable rates to those beyond its territorial boundaries, both parties appear to presume that reasonableness is a proper criterion for review of extraterritorial rates. A number of courts have considered this question. Some of these courts have held that the reasonableness of extraterritorial sewer or water rates is not subject to judicial review. See
Payson Sanitary District of Gila County v. Zimmerman,
Many other courts, however, have held that though the yardstick for measuring the reasonableness of a city’s extraterritorial rates may be different from that used to measure the reasonableness of resident rates, the reasonableness of any rate imposed by the city is open to judicial review. 12 E. McQuillin, Municipal Corporations § 35.37i, at 632-33 (3d ed. rev. 1986); see
Delony v. Rucker,
The terms of contracts in which municipalities set sewer rates for nonresident customers are enforceable only if the rates are in compliance with applicable law. See 11 E. McQuillin,
supra,
§ 31.30a, at 221 (3d ed. rev. 1983). Vermont law, which does not distinguish between resident and nonresident customers, requires that rates be fair, equitable and reasonable. See § 3615 (rates may be determined on any “equitable” basis; commissioners may change rates as “reasonably required”);
Kirchner,
The reasonableness of extraterritorial rates,, of course, is not linked solely to the cost of the hookup. In addition to recovering operating costs and capital costs associated with past, present or anticipated improvements of the facilities required to furnish the services,
4
a city may make a reasonable profit from extraterritorial rates. 12 E. McQuillin,
supra,
§ 35.37i, at 632; see
Hansen,
In support of their contention that the hookup fee was unreasonable, plaintiffs argue that a memorandum from the city engineer and the planning coordinator, which stated that “[fjactors were chosen which would result in [plaintiffs] being
*405
charged a fee of roughly $10,000,” shows that the hookup fee was based solely on “ability to pay” and, therefore, was arbitrary and unauthorized. We cannot agree. The hookup fee was based on the maximum amount of effluent that may be discharged under plaintiffs’ Act 250 permit, certainly an “equitable” basis as required by § 3615.
5
The question is whether the per gallon charge was reasonable. Although plaintiffs have shown that city officials wanted to charge plaintiffs approximately $10,000 for hooking up to the city sewer system, they have not met their burden of proving that the $10,000 figure was unreasonable or arrived at in an arbitrary manner. They have presented no cost analyses or other evidence showing that such a fee was inappropriate. See
South Shell Investment,
In sum, plaintiffs have failed to show that the hookup fee is not authorized by law, discriminatory or unreasonable.
II.
Plaintiffs also contend that the court erred by failing to address their estoppel argument, namely, that their fall, 1985 phone conversation with the former city attorney estopped the City from imposing any charges above those discussed during the conversation. We disagree. Plaintiffs raised the estoppel issue in their memorandum of law below only indirectly while addressing another argument, and then again in summary fashion in their reply memorandum. In total, in their memoranda below, plaintiffs devoted three sentences and one cite toward their estoppel argument. The one cite,
In re McDonald’s Corp.,
*406
The court held that the City was estopped from claiming treble damages for plaintiffs’ unauthorized hookup, ruling that the former city attorney had told plaintiffs that the hookup had been approved. This ruling, however, does not imply that the tentative rates mentioned during the phone call estopped the City from later imposing a hookup fee. Further, given plaintiffs’ indirect and inadequate briefing of the estoppel issue, the trial court did not err by not specifically addressing whether the rates mentioned over the phone estopped the City from imposing additional charges. See
Tallarico v. Brett,
Affirmed.
Notes
The mayor and board of aldermen of a city constitute a board of sewage disposal commissioners. 24 V.S.A. § 3614.
The Legislature amended § 3615 in 1989. Among other changes, the bases of the sewage disposal charges were expanded and reworded.
Plaintiffs also argue that the court erred by not addressing their antitrust argument. Assuming arguendo that the antitrust statutes cited by plaintiffs are applicable here, the trial court explicitly ruled that plaintiffs had failed to show that the City discriminated against them, a necessary element to their antitrust claim. See 15 U.S.C. § 13(a). As noted above, we agree with the court’s ruling.
Plaintiffs contend that § 3615 requires only industrial users to pay a share of the construction costs for sewage facilities. We disagree. Section 3615 requires industrial users to pay for construction costs “allocatable to the treatment of. .. industrial wastes.”
The City chose not to adopt other bases for rates allowed by § 3615 that are more closely related to ability to pay — appraised value or square footage of the premises.
