SAWS News: Raw Water Well Sample Tests Positive for Bacteria
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Edwards Aquifer

Aquifer Level 684.4'
5/16/19 - 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 684.4 | Year-Round Watering Hours

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Raw Water Well Sample Tests Positive for Bacteria

 SAN ANTONIO – During standard water quality sampling, a raw, untreated water sample from a well located near Bear Creek Street indicated the presence of E. coli bacteria. A residual of the former BexarMet system, the well is used infrequently.

SAWS will investigate the possible source of the bacteria, disinfect the well, and conduct further testing to determine future actions concerning the well.

The well is located in far west San Antonio, located between W. Military and Loop 1604, south of Marbach and north of Highway 90 West.

Raw, or untreated water, is water from a well before disinfection, and before entering the distribution system. All raw or untreated water is disinfected before entering the distribution system as finished water for customers.

This month so far, SAWS has collected approximately 192 finished water samples from our water system, none of these samples indicated the presence of E. coli.

“We are constantly testing San Antonio’s water to ensure it is high quality. Finding this result and responding to it is part of the process of ensuring safe drinking water,” said Donovan Burton, VP Water Resources & Governmental Relations.

Please note it is not necessary to boil or treat drinking water or take any other action prior to consumption. Under the Groundwater Rule established by the U.S. Environmental Protection Agency and the Texas Commission on Environmental Quality, SAWS is required to provide public notice if a water well tests positive for E. coli or fecal bacteria.  


See TCEQ Notice (pdf) for more details.

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