
994 S.W.2d 257 (1999)
HARLANDALE INDEPENDENT SCHOOL DISTRICT, Appellant,
v.
Susana HERNANDEZ, Appellee.
No. 04-99-00083-CV.
Court of Appeals of Texas, San Antonio.
May 19, 1999.
Juan J. Cruz, Escamilla & Poneck, Inc., San Antonio, for appellant.
*258 Katherine L. Duff, Duff & Vitela, P.C., Round Rock, for appellee.
Sitting: PAUL W. GREEN, Justice SARAH B. DUNCAN, Justice KAREN ANGELINI, Justice.

OPINION ON MOTION TO DISMISS
Opinion by: PAUL W. GREEN, Justice.
Susana Hernandez sued Harlandale Independent School District for violating the Texas Whistleblower Act. When the trial court denied Harlandale's motion to dismiss, the school district
A governmental unit may appeal an interlocutory order that "grants or denies a plea to the jurisdiction." TEX. CIV. PRAC. & REM.CODE ANN. § 51.014(a)(8) (Vernon Supp.1999); see also id. § 101(3)(B) (defining a school district as a governmental unit). A plea to the jurisdiction is the appropriate procedural vehicle to challenge the trial court's subject matter jurisdiction. City of Austin v. L.S. Ranch, Ltd., 970 S.W.2d 750, 752 (Tex.App.Austin 1998, no pet.). A trial court lacks subject matter jurisdiction if a plaintiff fails to comply "with an existing grievance procedure" before suing under the Whistleblower Act. Permian Basin Community Ctrs. for Mental Health & Mental Retardation v. Johns, 951 S.W.2d 497, 502 (Tex.App.El Paso 1997, no writ);[1]see also Essenburg v. Dallas County, 988 S.W.2d 188, 189 (Tex.1998).
Harlandale's motion to dismiss alleges that Hernandez failed to timely invoke the applicable grievance procedure. See TEX. GOV'T CODE ANN. § 554.006(a-b) (Vernon Supp.1999) (entitled "Use of Grievance or Appeal Procedures"). It does not allege that she failed to file suit within the applicable statute of limitations. See id. § 554.005 (Vernon 1994) (entitled "Limitation Period"). Because Harlandale's motion questioned subject-matter jurisdiction, the school district may appeal the trial court's denial of the motion. We therefore deny Hernandez's motion to dismiss the appeal for lack of jurisdiction.
NOTES
[1]  At the time Johns was written, the Whistleblower Act required a plaintiff to "exhaust" grievance procedures unless an administrative decision was not rendered within thirty days. Act of May 29, 1989, 71st Leg., R.S., ch. 1222, § 1, Tex. Gen. Laws 4943, 4943 (former TEX.REV.CIV. STAT. ANN. art. 6252-16a, § 3(d-e)). The statute now requires a plaintiff to timely "initiate" grievance procedures; and, if an administrative decision is not rendered in sixty-one days, the statute permits the plaintiff to exhaust the grievance procedures or immediately sue. Act of May 25, 1995, 74th Leg., R.S., ch. 721, § 6, 1995 Tex. Gen. Laws 3812, 3813 (current version at TEX. GOV'T CODE ANN. § 554.006 (Vernon Supp. 1999)). This change did not alter the jurisdictional nature of the administrative process.
