You can get a permit to dump treated wastewater into Barton Creek. Some are trying to change that.

AUSTIN (KXAN) -- Several conservationist groups are banding together to stop treated effluent from getting into certain waterways in Texas, including Barton and Onion creeks.
That means human waste where pollutants have been removed. Previous coverage: How discharged wastewater is feeding massive Hill Country algae bloomsCurrently, the Texas Commission on Environmental Quality (TCEQ) grants permits for those discharges.
Algae bloom in South San Gabriel River downstream of the Liberty Hill wastew