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One popular attraction in Austin, Texas is a spring-fed swimming area called Barton Springs Pool. The pool is fed by the Barton Spring which is fed by the Edwards Aquifer. Since the 1980's, the pool is occasionally closed due to high bacteria levels.

Which is the BEST explanation for the source of bacterial contamination?


The Edwards Aquifer is being depleted which increases the concentration of bacterial pollutants in the springs.


A housing development with septic systems was built in the Barton Creek watershed.


Old sewage pipes have begun to crack and leak in the Barton Creek watershed.


An industrial park with several manufacturing companies was built on the Edwards Aquifer recharge zone.


A sewage treatment facility was taken offline because of problems with outdated equipment and processes.

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