Impervious cover is defined by the City of San Antonio Unified Development Code, Sec. 35-A101 - Definitions and Rules of Interpretation. These surfaces do not allow water to be readily absorbed into the ground, increasing the amount of stormwater runoff produced from a property.
Public Works Department has gone through the process of measuring the impervious area of each parcel of land in San Antonio utilizing aerial and satellite imagery, and Bexar County Appraisal District property records. Based on these sources, the impervious area for all existing storm water accounts has been digitized into individual records.
Through the use of an interactive map, rate payers can view the amount of impervious area. Through an appeal process, there will be an opportunity to address errors in calculating the impervious area footprint.
Interactive Map
Any dispute contesting the amount of impervious area allocated to a given property will be addressed by comparing the digital record of impervious area to actual measurements provided by the rate payer based on the following definition of "impervious cover".
In all disputes concerning the calculation of the impervious area for benefited property raised by the owner or occupant responsible for paying the Storm Water Utility Fee, the complainant will have the obligation to present evidence to support the dispute.
The Director of Public Works shall make the final determination based on applicable law, regulations and engineering principles. The Director may delegate this authority to Public Works staff.