For several months Underwood Hills Environmental Adopt a Stream Citizen Science team has detected very high levels of e-coli in the stream through Underwood Hills Park.
As shown in the accompanying screenshot, currently there are no other monitored sites in the whole of Atlanta or Fulton county with such high levels. 
UHNA is organizing a community effort, with the guidance of Fulton Country EPD and Georgia EPA, to locate the source or sources of contamination and remediate. Meantime Park users are advised to avoid the water.
As a start, residents upstream of the park could check for sewerage leaks at the rear of properties on Springer, Marvin, Harper and Defoor that back on to stream tributaries.
Adopt a Stream Site data is available here 
​To get involved add reminders to your calendar and email uhadmin@underwoodills.org.