BacteriALERT program celebrates 20 years

BacteriAlert is a one of a kind, real-time bacteria monitoring program operated as a partnership between CRK, U.S. Geological Survey (USGS), and the National Parks Service (NPS). Together, we have now been collecting data from the Chattahoochee River for past 20 years. In that time, researchers have noticed a dependable pattern in the data – when it rains, stormwater washes pollutants into the river and bacteria levels rise. These spikes of bacteria can put people that recreate in the river at risk of getting sick.

Traditional tests for the bacteria levels have a turnaround time of 18-24 hours – meaning that the tests can only be processed in enough time to indicate that you should not have been swimming in the water yesterday if the results were high. Within the Chattahoochee River National Recreation Area (CRNRA), day old results were not sufficient to protect the 1.3 million people participating in water-based recreation every year. That’s why the BacteriAlert Program was created to provide real-time public advisories within 15 minutes whenever conditions indicate that the water is unsafe for swimming.

Meters are installed in three locations within the 48-mile long CRNRA – Medlock Bridge, Paces Mill, and  Powers Ferry. When one of these meters detects water that is turbid (or clouded with sediment), it is presumed that bacteria levels are elevated and a real-time advisory is sent to the publicly available database at

“I get calls from members asking if the Chattahoochee River is safe for recreation. And my answer is always ‘It depends’,” says CRK Riverkeeper Jason Ulseth. “The Chattahoochee River generally has good water quality and meets the U.S. Environmental Protection Agency standards for recreation except during periods following heavy rains. The good news is that you do not have to guess. Just bookmark the BacteriAlert website on your phone and you will always know when the bacteria levels are unsafe.”

This story was originally published in the Summer 2021 edition of RiverCHAT.

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