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Results of a 1983-84 reconnaissance of 15 municipal wastewater treatment plants in Florida indicated that effluent from most of the plants contains trace concentrations of volatile organic compounds. Chloroform was detected in the effluent at 11 of the 15 plants and its common occurrence was likely the result of chlorination. The maximum concentration of chloroform detected in the effluent sampled was 120 micrograms per liter. Detectable concentrations of selected organophosphorus insecticides were also common. For example, diazinon was detected in the effluent at 12 of the 15 plants with a maximum concentration of 1.5 micrograms per liter. Organochlorine insecticides, primarily lindane, were detected in the effluent at 8 of the 15 plants with a maximum concentration of 1.0 micrograms per liter. Volatile compounds, primarily chloroform, were detected in water from monitor wells at four plants and organophosphorus insecticides, primarily diazinon, were present in the ground water at three treatment plants. Organochlorine insecticides were not detected in any samples from monitor wells. Based on the limited data available, this cursory reconnaissance suggests that the organic contaminants commonly occurring in the effluent of many of the treatment plants are not transported into the local ground water. INTRODUCTION Land application of effluent is a widespread method of municipal wastewater disposal and reuse in Florida. As of January 1980, more than 2,500 wastewater disposal plants in Florida were classified as using one or more land-application techniques (Franks, 1981, p. 12). About 70 percent of the disposal plants use infiltration ponds, 20 percent use drain fields, and 10 percent use spray irrigation. Collectively, these 2,500 disposal plants apply about 150 million gallons per day of treated wastewater to the land surface throughout Florida. Many land application plants are located near high population areas where surficial aquifers are an integral part of the public watersupply system. Thus, the disposal of large quantities of wastewater, though treated, has the potential to adversely affect the integrity of public watersupply systems. Because land application of effluent may adversely impact public water supplies, the State of Florida requires periodic chemical analysis of both the effluent and water from monitoring wells at these disposal plants (Florida Department of Environmental Regulation, 1983). A critical concern is the lack of data on the organic composition of effluent and local ground water at these land-application plants.

Reconnaissance of selected organic contaminants in effluent and ground water at fifteen municipal wastewater treatment plants in Florida, 1983- 84