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Some local agencies may require implementing a Best Management Practice (BMP) plan,
Water Pollution Control Program (WPCP), or local stormwater pollution prevention plan (LSWPPP)
for smaller projects that have the potential to discharge pollutants in stormwater runoff.  The State of
California Department of Transportation (Caltrans) developed a Statewide Storm Water Management
Plan (SWMP) pursuant to the provisions of the National Pollutants Discharge Elimination System (NPDES)
permit (Order No. 99-06-DWQ) granted by the State Water Resources Control Board (SWRCB).  

In general, local agencies including Caltrans may require at any time that a contractor doing work involving
ground-disturbing activity, regardless of size of area, to comply with the SWMP or local ordinance that
governs stormwater runoff from project sites.  Contractors that are engaged in construction or demolition
projects that result in ground-disturbing activities within the Caltrans right-of-way that are less than one (1)
acre are typically required to prepare and implement a WPCP prior to commencement of work.
PROJECTS UNDER ONE (1) ACRE
WATER POLLUTION CONTROL PROGRAM
WPCP