What is NPDES?

The NPDES permit program addresses water pollution by regulating point sources that discharge pollutants to waters of the United States.

Created in 1972 by the Clean Water Act, the NPDES permit program is authorized to state governments by EPA to perform many permitting, administrative, and enforcement aspects of the program.

Proposed 2017 Construction General Permit

EPA is preparing to reissue the Construction General Permit (CGP) which authorizes stormwater discharges from construction activities. Comment period closes May 26, 2016.

Rainfall Erosivity Factor Calculator for Small Construction Sites

The Rainfall Erosivity Factor Calculator assists operators of small construction sites to estimate the rainfall erosivity factor (R-factor) to determine eligibility for the Low Erosivity Waiver.

Forest Roads Update

EPA’s timeline requiring issuance of a final determination as to whether to regulate stormwater from forest roads, has been extended from
May 26, 2016 to June 27, 2016.