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Study finds contaminated water reaching Florida's offshore keys

Athens, Ga. A new University of Georgia study finds that sewage-contaminated groundwater is reaching the offshore reefs of the Upper Florida Keys, possibly threatening corals and human health.

The widespread use of in-ground waste disposal through septic tanks and injection wells appears to be leading to the contamination of submarine groundwater even up to six miles offshore, said study author Erin Lipp, associate professor at the UGA College of Public Health. When the contaminated groundwater mixes with surface water and reaches the reef, the corals as well as human health might be harmed.

The findings were presented Tuesday at a meeting of the Florida Keys National Marine Sanctuary Water Quality Protection Program Steering Committee in Marathon, Fla.

Lipp and doctoral student Carrie Futch, along with Dale Griffin of the U.S. Geological Survey in Tallahassee, sampled surface water, groundwater and corals from five sites from nearshore to offshore beginning outside of Port Largo Canal and ending near Molasses Reef. Their three-year study revealed common fecal indicator bacteria and human viruses.

The fecal indicator bacteria, which are not pathogens themselves but rather serve as surrogates for other disease-causing microbes found in sewage, declined with distance from shore but tended to be elevated in the surface layers of coral mucus relative to the surrounding water. High levels of fecal indicator bacteria from canals were also shown to move into the nearshore environment on outgoing tides. Lipp said the detection of these bacteria in predominantly nearshore stations suggests that land-based sources of sewage pollution such as cesspits and septic systems may be a significant contributor.

Genetic material from enteric viruses, which cause disease in humans but are only found in infected human feces and urine, also were commonly found throughout the sampled area, including ground water more than six miles o
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Contact: Sam Fahmy
sfahmy@uga.edu
706-542-5361
University of Georgia
24-Jul-2007


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