Septic Tanks May Allow Human Waste into Nearby Waterways.
A new study suggests that septic tanks don’t prevent fecal bacteria from seeping into nearby rivers and lakes. Researchers analyzed 64 river systems and found bacterial concentrations were highest where there were higher numbers of septic systems in the watershed area. Previously, experts thought soil worked as a natural treatment system that could filter human sewage. Dr. Joan Rose, an international expert in water microbiology, water quality, and public health safety adds that the study “has important implications on the understanding of relationships between land use, water quality, and human health as we go forward.”
Proceedings of the National Academy of Sciences, August 2015