Answer to Question 1
The National Pollutant Discharge Elimination System is a program that regulates the discharge of pollutants from point sources to waters of the United States.
Answer to Question 2
A CAFO is a concentrated animal feeding operation, which is an agricultural operation where animals are raised in confined situations for at least 45 days in a 12-month period, and there is no grass or other vegetation in the confinement area during the normal growing season.