OPINION
Appellants Gatesco, Inc. Ltd. and 2205 Ave. I Ltd. challenge the trial court’s order granting a plea to the jurisdiction in favor of appellees the City of Rosenberg and the City’s mayor, Joe. M. Gurecky (collectively “Rosenberg”). We reverse the trial court’s order and remand for further proceedings.
I. Factual and Procedural Background
Rosenberg is a home-rule city located in Fort Bend County. Gatesco purchased commercial property (“the Property”) located within Rosenberg’s city limits in 1996 and then sold the Property to 2205 Ave. I in 2006. Rosenberg’s Code of Ordinances authorizes Rosenberg to provide water and sewer services to its residents, and Rosenberg has continuously provided these services to the Property since 1996. Rosenberg has at all times charged monthly water and sewer service fees by using a graduated scale based on the Property’s monthly water consumption, with a minimum charge based on the monthly use of up to 2,000 gallons of water. 2205 Ave. I learned in early 2008 that Rosenberg has consistently charged a monthly rate of eight times the minimum rate for water and sewer services since Gatesco purchased the Property. Appellants believed this multiple-rate charge was improper and demanded that Rosenberg refund these alleged overcharges (the “Overcharges”). Rosenberg declined to refund any fees, and appellants subsequently filed suit. Appellants sought (1) declaratory relief stating that Rosenberg unlawfully overcharged appellants for water and sewer services and that Rosenberg’s enforcement of its Code of Ordinances violated appellants’ constitutional rights, (2) prospective injunctive relief enjoining Rosenberg from violating appellants’ constitutional rights by collecting excessive fees for water and sewer services, (3) reimbursement of all Overcharge amounts paid from 1996 to the present through the equitable doctrine of money had and received, and (4) recovery of interest, costs, and attorney’s fees.
Rosenberg filed a plea to the jurisdiction, or alternatively, motion for summary judgment, challenging the trial court’s subject matter jurisdiction on two grounds. First, Rosenberg argued that the Texas Commission on Environmental Quality (“TCEQ”) possessed primary or exclusive appellate jurisdiction over appellants’ water and sewer rate claims. 1 Second, Rosenberg claimed that governmental immunity 2 barred appellants’ claims seek *143 ing equitable reimbursement of any Overcharge amounts and appellants’ claims for costs and attorney’s fees. Following a hearing, the trial court granted Rosenberg’s plea to the jurisdiction. Appellants raise two issues on appeal challenging the trial court’s order.
II. Analysis
a) Standard of Review
A plea to the court’s jurisdiction challenges a trial court’s authority to determine the subject matter of a controversy.
See State v. Holland,
A plea to the jurisdiction can challenge either the pleadings or the existence of jurisdictional facts.
Tex. Dep’t of Parks & Wildlife v. Miranda,
b) Does the TCEQ have Primary or Exclusive Appellate Jurisdiction over Appellants’ Water and Sewer Service Rate Claims?
Appellants contend in their first issue that the trial court erred in finding it lacked appellate jurisdiction over their water and sewer service rate claims. Rosenberg’s plea to the jurisdiction asserted that the TCEQ was required to hear these claims before the trial court gained jurisdiction over the case. However, this court recently held that section 13.042 of the Texas Water Code does not grant the TCEQ exclusive or primary jurisdiction over challenges to water rates charged by municipalities.
See Tara Partners, Ltd. v. City of S. Houston,
c) Does Governmental Immunity Bar Appellants’ Claims for Equitable Relief?
In their second issue, appellants argue that the trial court erred in granting Rosenberg’s plea to the jurisdiction because their claims for equitable relief are not barred by governmental immunity.
4
Governmental immunity from suit defeats a trial court’s subject matter jurisdiction and is thus properly asserted in a plea to the jurisdiction.
Miranda,
Appellants assert in their pleadings that they are entitled to an equitable declaration that Rosenberg unlawfully collected the Overcharges and that they are entitled to a refund of the Overcharges. This argument is based on appellants’ contention that the Overcharges are not Rosenberg’s property.
See Nivens,
During oral argument, appellants objected to this new argument because Rosenberg’s plea to the jurisdiction made no mention of appellants’ failure to plead fraud, mutual mistake of fact, or duress. Appellants requested an opportunity to amend their pleadings to cure these newly-contested jurisdictional defects and argued alternatively that the pleadings sufficiently show the Overcharges were paid due to either mutual mistake of fact or duress.
6
See Tex. A & M Univ. Sys. v. Koseoglu,
*146 III. Conclusion
We conclude the trial court had jurisdiction over appellants’ claims disputing Rosenberg’s imposition of water and sewer service fees, appellants’ claims for declaratory relief related to Rosenberg’s implementation and enforcement of its Code of Ordinances, appellants’ claims for prospective injunctive relief related to Rosenberg’s water and sewer service fees, and appellants’ claims for costs and attorney’s fees. We further conclude that appellants should be afforded an opportunity to amend their pleadings to respond to Rosenberg’s new allegations that governmental immunity bars any equitable retrospective recovery of the Overcharges because appellants failed to plead that the Overcharges resulted from fraud, mutual mistake of fact, or duress, whether express or implied.
We therefore reverse the trial court’s order dismissing appellants’ claims and remand for further proceedings consistent with our opinion.
Notes
. See Tex. Water Code Ann. § 13.042 (Vernon 2008) (granting the TCEQ exclusive appellate jurisdiction "to review orders or ordinances” under the Texas Water Code).
. Rosenberg asserted it was protected by "sovereign immunity,” but any immunity enjoyed by Rosenberg would derive from governmental immunity. Sovereign immunity refers to the State’s immunity from suit and liability and also protects various divisions of state government.
Wichita Falls State Hosp. v. Taylor,
. The Tara plaintiffs alleged South Houston's water and sewer rates were unlawful and unconstitutional under Texas law and that the charged rates were unreasonable, unjustified, arbitrary, and unreasonable. Id. at 571. The Tara plaintiffs also sought declaratory judgments incorporating these allegations and sought reimbursement of past payments. Id.
. Appellants' equitable claims for relief are based primarily on the doctrine of money had and received, which rests on a premise that the plaintiff “paid money to the defendant ], either by mistake or fraud, that, in equity or good conscience, should be returned to the plaintiffs.”
Stonebridge Life Ins. Co. v. Pitts,
. Rosenberg also argued that appellants’ claims for costs and attorney’s fees are barred by governmental immunity. The DJA contro
*145
verts this argument.
See
Tex. Civ. Prac. & Rem.Code Ann. § 37.009 (Vernon 2008) ("In any proceeding under this chapter, the court may award costs and reasonable and necessary attorney's fees as are equitable and just.”);
Tex. Educ. Agency v. Leeper,
. Appellants argue Gatesco and 2205 Ave. I paid the Overcharges from 1996-2008 based upon a mutual mistake of fact because Rosenberg erroneously assumed that eight tenants were simultaneously occupying the Property, a situation which appellants deny has ever occurred. 2205 Ave. I argues it is currently paying more than the minimum monthly rate under duress because failure to pay the fees could potentially result in a fine or cessation of water and sewer services. We decline to address the merits of these claims as we find appellants should be given an opportunity to amend their pleadings.
