Biological Systems Engineering


Date of this Version



Published by University of Nebraska – Lincoln’s Livestock Environmental Issues Committee.


Alternative Treatment Systems

The February 13, 2003 Federal Register revised the Environmental Protection Agency’s (EPA’s) “Part 412-Concentrated Animal Feeding Operations (CAFO) Point Source Category,” which described the revised Effluent Limitations Guidelines (ELG) and New Source Performance Standards (NSPS) for concentrated animal feeding operations (CAFOs). The regulation applies to manure, litter, and/or process wastewater discharges resulting from CAFOs. Subpart C addresses dairy cows and cattle other than veal calves, which includes dairy operations and beef cattle feedlots. Subpart D addresses swine, poultry, and veal calves. Baseline ELGs in the revised rule prohibit discharge of process waste waters except when rainfall events cause an overflow from a facility designed, constructed. and operated to contain (a) all manure, litter and process waste waters plus (b) the runoff from a 25- year recurrence interval, 24-hour duration rainfall event. The baseline ELGs fall into four categories: 1) Best practicable control technology (BPT) currently available, 2) Best conventional pollutant control technology (BCT), 3) Best available technology (BAT) economically achievable, 4) New source performance standards (NSPS).