. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. WASTEWATER DISCHARGES WASTEWATER DISCHARGES The Federal Clean Water Act of 1972 required every public or private facility discharging wastes directly into the waters of the United States to have a Na- tional Pollutant Discharge Elimination System (NPDES) permit. This permit establishes discharge limitations for specific pollutants, establishes sched- ules for plans to meet these limitations, and req
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. WASTEWATER DISCHARGES WASTEWATER DISCHARGES The Federal Clean Water Act of 1972 required every public or private facility discharging wastes directly into the waters of the United States to have a Na- tional Pollutant Discharge Elimination System (NPDES) permit. This permit establishes discharge limitations for specific pollutants, establishes sched- ules for plans to meet these limitations, and requires monitoring and periodic reporting on facility compli- ance. In Illinois, there are approximately 2696 NPDES facilities that receive wastewater discharge permits issued by the Illinois Environmental Protec- tion Agency (lEPA). Of these facilities, 272 are major facilities that file discharge monitoring reports with lEPA. These reports are stored in USEPA's National Permit Compliance System (PCS) auto- mated database. The PCS data and accompanying analysis were provided by lEPA to develop trends in effluents. The analysis divided dischargers into municipal and non- municipal categories, with electric utilities and manufacturing facilities making up the non-municipal category. The analysis included only those major facilities that reported an equivalent number of sample measurements for a specific parameter every year from 1987 through 1992. The lEPA used the PCS load program to calculate loads associated with wastewater effluent. The pollutants analyzed are traditionally associated with municipal and non- municipal facilities and are reported by a significant number of major facilities. FINDINGS Major Municipal Figure 1 illustrates statewide loadings of biological/ carbonaceous biological oxygen demand (BOD/ CBOD), total suspended solids (TSS), and ammonia. Fifty-five facilities were included in the load analysis of BOD/CBOD, with an estimated statewide loading in 1987 of a
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