Tomball Independent School District (TISD) is fully accredited by the Texas Education Agency PK-12, and the Southern Association of Colleges and Schools grades 7-12. TISD serves students in northern Harris County and southwestern Montgomery County, Texas. TISD Vision: TISD students will lead in creating the future. TISD Mission Statement: Educate students to become responsible, productive citizens by providing innovative, individually rigorous, and personally valuable educational experiences. Tomball ISD is not just a District, it is a Destination.