OPINION
FACTS AND PROCEDURAL HISTORY
Plaintiff Tucson Unified School District (TUSD or district) filed a complaint in the United States District Court in Tucson alleging that various defendants were liable to it for the cost of removing asbestos products from 81 of the district’s buildings. *337 TUSD was creаted pursuant to the Arizona Constitution and statutes for the purpose of providing, in the Tucson area, a public school system as required by the state’s constitution. In their answer, various defendants (Owens) claimed that TUSD was barred by the statute of limitations from bringing this action. TUSD moved to strike that defense on the ground that statutes of limitation do not run against the school district. The federal court granted TUSD’s motion, holding that A.R.S. § 12-510 exempts TUSD from the statute of limitations.
The federal court, on request of both parties, then certified to this court the question whether section 12-510, as interpreted by Arizona case law, precludes the defendants from successfully interрosing a statute of limitations defense in this case. We accepted jurisdiction of the certified question pursuant to A.R.S. § 12-1861 and Rule 27(b), Rules of the Supreme Court. We hold that section 12-510 applies to the school distriсt pursuing this asbestos litigation.
ISSUE PRESENTED
The district court phrases its question as follows: In light of A.R.S. § 12-510,
City of Bisbee v. Cochise County,
DISCUSSION
I. A.R.S. § 12-510 applies to school districts.
A.R.S. § 12-510 states that “[e]xcept as рrovided in § 12-529, the state shall not be barred by the limitations of actions prescribed in this chapter.” Section 12-510 exists, at least in part, to protect the public from the negligence of public officers that might deprive the public of its rights to redress against wrongdoers.
See Trimble v. American Sav. Life Ins. Co.,
School districts are clearly defined аs political subdivisions of the state, see A.R.S. § 15-101(15), and are sufficiently analogous to cities and counties so as to fall within the rationale of City ofBisbee. School districts are publicly supported entities exercising the state’s constitutional mandate to educate children within the subdivision of the state that they serve. Therefore, we reject Owens’ argument that school districts are excluded from section 12-510.
Owens also argues that the languagе of another statute, A.R.S. § 12-529, 1 independently shows that the legislature did not intend to include political subdivisions of the state, and hence school districts, within the coverage of A.R.S. § 12-510. We disagree. Section 12-529 states:
*338 Any actiоn brought by this state or any person claiming through this state for lands, or for the rents or profits from lands, based on a claim of navigability of any watercourse, as defined in §37-1101, except the Colorado river, is subject to аll legal and equitable defenses which would be available if the claimant were not this state or a private person or political subdivision of this state claiming through this state.
(Emphasis added.)
Certainly, section 12-529 suggests that statutes of limitation do run against political subdivisions in claims involving nаvigability of watercourses. In contrast, section 12-510 does not expressly exempt political subdivisions from statutes of limitation. From this, Owens argues that the section 12-529 language shows that the legislature knew how to include political subdivisions when it intended; therefore, goes the argument, the legislature must have intended that the section 12-510 immunity not apply to political subdivisions.
We believe that section 12-529 suggests, contrary to Owens’ argument, that рolitical subdivisions are included within the ambit of section 12-510. Under the common law, which would apply absent an applicable statute, limitations do not run against the state.
Shumway v. State,
II. A.R.S. § 12-510 applies to this case.
The issue of most concern to the federal district court was whether the activities of the school district in this particular case removed it from the protection of A.R.S. § 12-510. Owens argues, citing cases from other jurisdictions, that when a school district is engaged in litigation over the removal of asbestos from its schools, immunity from statutes of limitation does not apply. Owens argues that building schools is nоt within the constitutional purpose of the school district; therefore, the district’s pursuit of its asbestos claims is similar to a private litigant suing for a construction, defect. Therefore, the statutes of limitation should aрply.
Owens’ argument is a form of the public-private or governmental-proprietary distinction. Some cases from other jurisdictions deciding this issue have used this test. Some support Owens’ argument, finding that a school district suing tо clean up asbestos contamination in school buildings is acting in a proprietary capacity and is therefore subject to statutes of limitation.
See Anderson County Bd. of Educ. v. National Gypsum Co.,
This court has never accepted the governmental-proprietary distinction in determining the applicability of A.R.S. § 12-510. In fact, this court in
State v. Versluis
noted that, in
City of Bisbee,
we intimated strongly, but did not hold, that the “old distinction ... between municipalities aсting in their sovereign and their private capacity was practically obsolete.”
State v. Versluis,
In addition to the cases from other jurisdictions, Owens argues that our own court of appeals has implicitly accepted the governmental-proprietary distinction in
Grim v. Anheuser-Busch, Inc.,
Grim
involved an injured worker who brought a third party claim without first obtaining a reassignment of the claim from the Industriаl Commission. The defendant moved for summary judgment, claiming that Grim had not received a reassignment of the claim from the commission before the statute of limitations ran. Grim argued that the commission knew about her lawsuit and rаtified it; however, the trial court granted summary judgment. On appeal, Grim claimed that, because of A.R.S. § 12-510, the commission could reassign the claim to her even after the statute of limitations had run. The court of appeals disagreed, holding that, even if the commission properly reassigned the claim to Grim, her claim was still barred by the statute of limitations.
See Grim,
In
Sergent, Hauskins,
the court of appeals expressly stated that it did not reach the government-proprietary distinction.
In contrast, TUSD is a political subdivision of the state of Arizona and is the plaintiff bringing an action for its own benefit. The subject matter of the lawsuit is immaterial. The nature of the plaintiff, not of the litigation, determines the applicability of A.R.S. § 12-510. To the extent that language in earlier court of appeаls’ opinions suggests otherwise, it is disapproved.
DISPOSITION
Our answer to the question certified by the United States District Court is that the public-private distinction does not determine whether TUSD is exempt from the statute of limitations. Under Arizona law, A.R.S. § 12-510 precludes Owens from *340 raising the statute of limitations as a legal defense to the suit by TUSD. No question concerning equitable defenses, such as laches or estoppel, has been presented to or considered by us. Pursuant to Ariz. Const. art. 6, § 3, the Honorable NOEL FIDEL, Chief Judge of the Arizona Court of Appeals, Division One, was designated to sit in his stead.
Notes
. Section 12-529 was declared unconstitutional by the opinion in
Arizona Center for Law in the Public Interest v. Hassell,
That decision is unrelated to our present discussion of legislative intent.
