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Satilla Riverkeeper and a team of dedicated volunteers conduct water quality sampling at 10 public landings on the Satilla River Water Trail. During the summer months, water quality samples are taken every two weeks. The most recent testing took place on Monday, August 24th.
One of the parameters volunteers test is bacteria. The concentration of Escherichia coli (E. coli), a species of coliform bacteria found in the gastrointestinal tract and feces of mammals, can be an indicator of the presence of other harmful bacteria or pathogens in the water. All of the public landings tested on Monday, August 24, 2020 showed E. coli levels within the safe limits for swimming areas.
Site Bacteria Count. (cfu/100mL)
Jamestown Landing 133
Hwy 121 Nahunta 0
Us 84 Waycross 66
FFA Camp Landing 0
US 301 Nahunta 100
US 82 Ava Lightsey Strickland Landing 0
Warner’s Landing 33
Woodbine Waterfront Park 0
Why look specifically for E. coli?
E. coli acts as an indicator species. If significant amounts of E. coli are found, there are most likely other bacteria such as disease-causing bacteria and viruses. However, this is not always the case. Just because there are colonies of E. coli found in the water does not mean that there are always the other harmful bacteria and viruses present. And vice versa, just because E. coli isn’t detected, it does not mean that the water ways are always safe. There is, however, a proven positive correlation with high levels of E. coli and illness and infection.
How does E. coli enter waterways?
E. coli may enter our water ways through a variety of pathways. Agricultural runoff is a large contributor of E. coli into streams and rivers. Old and worn septic systems are another major player in E. coli introduction as they are likely to leak into the environment and ultimately into waterways. The last major contributor is through legacy bacteria. This is bacteria that has managed to remain in an area long after the site where it was created has been abandoned. During rain events, this bacteria is churned up into the water column with soil and manages to find its way into the water ways
The Satilla Riverkeeper has run a five-week project, sampling sites along the Satilla River once a week for the duration of the five weeks. One day of each week has been used to sample and the following day has been used to read the results. The water samples were incubated for 24 hours. Even weekly sampling results may not always be accurate. Rain events immediately following sampling may lead to temporarily spiked levels of E. coli that could not be accounted for.
All results of bacteria testing from the Satilla Riverkeeper are posted to Swim Guide. However, it is best to make decisions with one’s own judgement. If there has been a recent storm, chances are there are going to be higher levels of E. coli. If it has been a dry week, E. coli levels are probably low. By pairing the data found on Swim Guide with personal judgement based on these factors, one can ensure a safer trip to the Satilla River.
The Environmental Protection Agency recommendations for E. coli levels in recreational waters are in the table below:
Moderate swimming area
Light swimming area
Infrequent swimming area
In addition to monitoring bacteria levels, volunteers use the protocols developed by Georgia Adopt-A-Stream to monitor dissolved oxygen, pH, temperature, and conductivity. These water quality parameters serve to provide an early warning to the potential of nonpoint source contaminants in the Satilla River. Volunteers sample sites along the Satilla River on a monthly basis and report the data to Adopt-A-Stream (https://adoptastream.georgia.gov ).
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