SAWS: Service Areas
Aquifer Beaker

Edwards Aquifer

Aquifer Level 678.8'
7/17/19 - 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 678.8 | Year-Round Watering Hours

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Service Areas

Service Areas

San Antonio Water System serves more than 1.6 million people in Bexar County, as well as parts of Medina and Atascosa counties. This population includes more than 460,000 water customers and 411,000 wastewater customers.

SAWS Water Service Area

SAWS Water Service Area (PDF)
13 MB

SAWS service areas are established by its permits from state regulatory authorities. The service area for water supply includes most of Bexar County, several suburban municipalities and adjacent parts of the county. In addition to serving its own retail customers, SAWS also provides wholesale water supplies to several smaller utility systems within this area.

A larger and somewhat different area, following natural watersheds, is defined for wastewater collection and treatment. SAWS is the only sewage treatment agency in this area, and it charges a fee to the military bases and suburban cities which maintain their own wastewater collection systems. SAWS also provides collection and treatment services by contract to developments outside its defined service area to avoid unnecessary proliferation of state wastewater discharge permits.

Sewer Service Area

SAWS Sewer Service Area (PDF)
487 KB

Extensions of SAWS water and sewer systems are accomplished by a combination of direct action by new subdivision developers and expansion of off-site facilities by SAWS. First, subdivision developers are required to install all of the water and sewer facilities within their development projects at their own expense. The design and construction of these facilities must be approved by SAWS, and the facilities are dedicated to the System upon completion. Corresponding extension of off-site mains and expansion of overall system capacity are then financed by the development "impact fees," which are authorized by state law. These fees are enacted by the San Antonio City Council, and they are based on the estimated average water demand by various kinds of development.

Impact fees are recalculated every three years to finance projected system expansion needs based on updated growth projections. This financing mechanism is designed to ensure that new development "pays its own way," rather than being subsidized by existing customers.


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