SAWS: Regional Carrizo
Aquifer Beaker

Edwards Aquifer

Aquifer Level 665.3'
2/23/18 - Official

The Edwards aquifer and its catchment area in the San Antonio region is about 8,000 square miles and includes all or part of 13 counties in south-central Texas.

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Year-Round Watering Hours

Watering with an irrigation system or sprinkler is allowed any day of the week before 11 a.m. or after 7 p.m.

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Aquifer Level 665.3 | Year-Round Watering Hours


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Carrizo Aquifer

Carrizo Aquifer

Project to Help With Water Supply Diversification

A cooperative regional partnership has helped to secure SAWS' largest non-Edwards Aquifer water supply to date. Approval of permits by the Gonzales County Underground Water Conservation District will allow SAWS to produce and transport up to 11,688 acre-feet of Carrizo Aquifer groundwater from Gonzales County to San Antonio. Construction completion and are currently underway on all segments of the project.

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Project Profile

The Regional Carrizo project is located approximately 50 miles east of San Antonio and includes delivery of water from western Gonzales County.

Up to 13 million gallons per day (mgd) of water produced from this well field is transported by pipeline to an integration point in northeast San Antonio where it enters the SAWS distribution system.

Instead of building a new pipeline, SAWS is "renting" available capacity in an existing pipeline owned and operated by Schertz-Seguin Local Government Corporation (SSLGC), saving San Antonio ratepayers $88 million in infrastructure costs. As of July 2014, construction of the supply pipeline, pump station and delivery pipeline had been completed.

Current activities underway include completion of the well field and expansion of the SSLGC water treatment plant which will treat SAWS' water.

Surplus water from SSLGC began flowing through the pipelines in December 2013, while limited production from SAWS' own well field started in March 2014.

When complete, the project is estimated to cost $149 million and will provide water for approximately 60,000 households.

Project Benefits

  • The Regional Carrizo project will assist in diversifying San Antonio's water supply, reducing dependence on existing Edwards Aquifer supplies.
  • The project will provide water to help meet San Antonio's short- and mid-term water needs.
  • Up to 5,550 acre-feet of additional supply could be added to the total project through purchase agreements with other utilities, for a total supply to San Antonio of up to 17,237 acre-feet per year.

Regional Carrizo Water Supply Project

* An acre-foot of water is equivalent to 325,851 gallons.