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Geology & Hydrology

Delineation

Advanced Data Gathering Using GPS

Well Pump Station Geology

Abandoned Well Program

Public Outreach

Aquifer Protection Areas

Future Plans

References

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Source Water Protection Initiatives

ore than 1.5 million people in South Central Texas and San Antonio rely on the Edwards Aquifer for their drinking water. This was the first aquifer in the United States to receive a sole source designation by the Environmental Protection Agency in 1975 under the Safe Drinking Water Act (SDWA). The amendments to the Safe Drinking Water Act of 1986 provide for ground-water protection, which includes the Wellhead Protection Program. Additionally, amendments to the Safe Drinking Water Act of 1996 establish a new charter for the nation's public water systems, in protecting the safety of drinking water. The amendments include, among other things, approaches to prevention, and a source water protection assessment program. According to the SDWA, "a State assessment program is required to: (1) delineate the boundaries of the areas providing source waters for public water systems, and (2) identify (to the extent practicable) the origins of regulated and certain unregulated contaminants in the delineated area to determine the susceptibility of public water systems to such contaminants".

SAWS has developed and is continuing to expand the scope of its Source Water / Wellhead Protection Program. This program received an EPA Environmental Excellence Award in 1999.

The project incorporates the study of the general geology in the San Antonio area, occurrence of groundwater, land use, inventory of historical and present potential contamination sources within the area of each public supply water well, and a public education campaign. Land use activities are monitored over the Edwards Aquifer Recharge Zone, one of the largest areas in the San Antonio region where contaminants could enter our water supply.