Contribution of on-site treatment and disposal systems on coastal nutrient loading

When onsite treatment and disposal systems (OSTDS) are not properly sited, they can be a potential risk to public health and a source of environmental degradation. In Florida, OSTDS location has proven to be problematic from a water resources perspective. The objective of this study is to quantify the pollutant loading contributions from OSTDS on coastal canals, with regard to nutrients and pathogens indicators (Total Coliform, E. coli, Enterococcus). Two similar single-family residential locations were identified: Dania Beach, FL (with 100% OSTDS) and Hollywood, FL (with 100% sewer). Field studies were conducted during the height of the wet and dry seasons. During the wet season, surface water quality of the canal was affected by an OSTDS contribution with higher levels of nutrients and pathogens indicators. During the dry season, no OSTDS impact was detected. OSTDS appear to work properly during the dry season.