Construction Site Runoff Control


Countywide Stormwater Pollution Prevention Program

Foam Pollution (Stormwater)

Control measures for construction site runoffConstruction Site Runoff Control

Federal, State and Local Regulations

There are two NPDES permits that regulate polluted runoff from construction sites:  NPDES Construction General Permit and NPDES Municipal General Permit.

NPDES Construction General Permit

Significant new requirements!

Any property owner whose project disturbs one acre or more of soil is required to obtain coverage under the General Permit for Discharges of Storm Water Associated with Construction Activity
.  Construction activity subject to this permit includes clearing, grading and disturbances to the ground such as stockpiling or excavation but does not include regular maintenance activities performed to restore the original line, grade or capacity of the facility.

You can learn more about the General Permit at the State Water Resources Control Board's web site.

Construction General Permit Presentation (from 04-05-10 workshop)

NPDES Municipal General Permit

All of the incorporated and unincorporated areas within the Napa River watershed are covered under the Phase II NPDES Municipal General Permit.  Under this permit, the NCSPPP partners are required to develop, implement and enforce a program to reduce pollutants from construction sites.  This program includes the following:

  • legal authority to establish BMP requirements
  • procedures for site plan review
  • procedures for receiving complaints from the public
  • procedures for inspection and enforcement

You can learn more about the local requirements for each of the NCSPPP partners as well as the use of BMPs to control pollution from custruction sites by contacting us.