NPDES Stormwater Discharge Permits
Stormwater runoff from land and impervious areas such as paved
streets, parking lots, and building rooftops during rainfall and
snow events often contain pollutants that could adversely affect
water quality. National Pollutant Discharge Elimination System
(NPDES) permits are required for storm water discharges to surface
waters from construction and industrial activities and
municipalities if stormwater from rain or snow melt leaves your site
through a "point source" and reaches surface waters either directly
or through storm drainage. A point source is a natural or
human-made conveyance of water through such things as pipes,
culverts, ditches, catch basins, or any other type of channel.
- Application Forms and
Find application and fee information to register for
coverage under the NPDES general permits for stormwater
discharges to surface waters.
- Construction Activities
and permit copies for NPDES general stormwater
permits covering construction activities.
- 1200-C Application Guidance,
Forms, and Drawings
- Industrial Activities (1200-A,
General information, permit copies and application information for NPDES general stormwater permits
covering industrial activities that are subject to
permitting as determined by federal regulations.
- Municipal (MS4): Phase I
Copies of Phase I NPDES MS4 permits and evaluation reports
for the Portland Metro Area, Eugene, and Salem.
- Municipal (MS4): Phase II
Copies of Phase II municipal stormwater permits, evaluation
reports, and guidance documents.