(a) The board may not impose an assessment or finance a service or improvement project under this chapter unless a written petition requesting the improvement or service has been filed with the board.(b) The petition must be signed by:(1) the owners of a majority of the assessed value of real property in the district or in the area of the district that will be subject to the assessment as determined by the most recent certified tax appraisal roll for Harris County; or(2) at least 25 persons who own real property in the district or the area of the district that will be subject to the assessment, if more than 25 persons own real property in the district or area that will be subject to the assessment as determined by the most recent certified tax appraisal roll for Harris County. Added by Acts 2007, 80th Leg., R.S., Ch. 1288 (H.B. 4110), Sec. 1, eff. June 15, 2007.