§301.345. Population Equivalent

"Population Equivalent" is a term used to evaluate the impact of industrial or other waste on a treatment works or stream.  One population equivalent is 100 gallons (380 l) of sewage per day, containing 0.17 pounds (77 g) of BOD₅ (five day biochemical oxygen demand) and 0.20 pounds (91 g) of suspended solids.  The impact on a treatment works is evaluated as the equivalent of the highest of the three parameters.  Impact on a stream is the higher of the BOD₅ and suspended solids parameters.