Construction

Stormwater runoff is part of a natural hydrologic process. However, land development and construction activities can significantly alter natural drainage patterns, resulting in polluted stormwater runoff.

Stormwater runoff is part of a natural hydrologic process. However, land development and construction activities can significantly alter natural drainage patterns, resulting in polluted stormwater runoff. Dirt and other materials from construction sites can harm local creeks and San Francisco Bay if not controlled.

All construction projects are required use Best Management Practices (BMPs) to protect soil from erosion, prevent sediment discharges, and use good site managment pratices to control other pollutants.

Small Construction Projects
The Municipal Regional Permit and local ordinances require projects that involve ground disturbances to implement BMPs to protect stormwater quality. Typically, small projects involve ground disturbances of less than one acre. Larger projects may also need the State Construction Stormwater Permit (see details in the next section).

If your project 
requires a permit from the local agency you may need to develop an Erosion Control Plan that describes the BMPs that you will take to prevent dirt and other materials from running off the site. 
MRP Provision C.6 requires sites to implement the following categories of BMPs:
  •  Erosion Controls
  • Run-on/Runoff Controls
  • Sediment Controls
  • Active Treatment Systems (if necessary)
  • Good Site Management
  • Non-Stormwater Controls

ACCWP Tips for Small Construction Operators  (English) (Spanish) (Chinese)

State Construction Stormwater General Permit

Projects disturbing one acre or more of surface, or less than one acre but part of a larger plan of development or sale, are required to obtain coverage under the State of California’s Construction Stormwater General Permit referred to as the CGP as well as obtain permits or approvals from the local agency.

Projects subject to the CGP must develop and implement a Stormwater Pollution Prevention Plan and implement a construction site monitoring plan. A qualified individual must prepare the plans. Refer to the State Water Board’s Construction Stormwater page for details.

Alert:  The CGP was reissued in 2022 and went into effect on September 1, 2023.

Best Management Practices

Through its CASQA membership and subscription to the California Construction BMP Handbook,  the Alameda Countywide Clean Water Program is making these BMP fact sheets available to local construction operators.  The fact sheets are available for individual use and commercial reproduction is prohibited without written approval from CASQA.  The full handbook and all the BMP factsheets are available from CASQA for a fee. The CASQA reference number is shown in parentheses.)

Erosion Controls

Sediment Controls

Run-on/Runoff Controls

Good Site Management

Non-Stormwater Management

Other Construction Guidance Documents

C.6 Inspection Tracking Template (formulas_corrected_07-25-2019)
Heavy Equipment Yards BMPs (Poster )
Construction Site Inspection Form (Word file)
Construction Site Inspection Form (PDF fillable form)

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