The purpose of the ordinance is “to preserve a clean and safe drinking water supply, to prevent further degradation of the water quality in Barton Creek, Barton Springs, and the Barton Springs Edwards Aquifer, to provide for fair, consistent, and cost effective administration of the City's watershed protection ordinances, and to promote the public health, safety, and welfare.” The ordinance limits impervious coverage on certain areas of the Edwards Aquifer watershed and establishes regulations for buffers around specific water quality zones of certain major waterways.