A Stormwater Pollution Prevention Plan (SWPPP) is a document that describes how a project will prevent pollution during the construction process. This document details how erosion will be prevented and how sediment will be controlled, as well as how other construction-related pollutants, such as concrete dust and fluids from construction equipment, will be prevented. SWPPPs, which are required under the California Construction General Permit, must be submitted for projects disturbing at least 1 acre of soil, and for certain projects involving less earthwork but pose special threats to water quality. Smaller projects also are required to implement adequate erosion and sediment controls.
A Stormwater Control Plan (SWCP) is a document that details permanent stormwater management facilities (such as bioretention areas) that will be incorporated into development projects to treat stormwater runoff and control runoff rates and volumes after the construction process is completed. SWCPs are required for projects that must implement permanent stormwater management facilities to comply with C.3 of the NPDES Permit.