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Frequently asked questions


What is a WDID Number?

A WDID number is a Waste Discharge Identification number that is issued for construction projects that are required to obtain coverage under the NDPES General Permit for construction activities. A WDID number may be required by local agencies as a part of the building or grading permitting process. Several steps must be completed prior to obtaining a WDID number.

  • Determine if the construction project is required to obtain permit coverage.

  • Perform a risk assessment of the project.

  • Have a Storm Water Pollution Prevention Plan (SWPPP) or Small Site Erosivity Waiver prepared by a Qualified SWPPP Developer.

  • Prepare and submit a Notice of Intent on the SMARTS database.

What's Next?

Once a project has received a WDID number, permit coverage will last until a Notice of Termination has been filed after the project is complete. During construction, the project is required to have a Qualified SWPPP Practitioner manage implementation of the SWPPP and monitor the site for compliance. Site monitoring includes weekly inspections, storm event inspections, quarterly non-storm water inspections and possible storm water sampling. If a waiver has been obtained, the permit expires at the end of construction.

What is a QSD/QSP?

California now requires that key personnel have specific qualifications to assist compliance with General Permit requirements. There are two certifications required by the General permit. The QSD, which prepares SWPPPs, and the QSP who is responsible for overseeing field implementation and monitoring of the site The following section outlines the specific certification requirements.

QSD/QSP Certification Requirements

Qualified SWPPP Developer

  • One of the following professional certifications;

    • California registered professional civil engineer;

    • A California registered professional geologist or engineering geologist;

    • A California registered landscape architect;

    • A professional hydrologist registered through the American Institute of Hydrology;

    • CPESC through Enviro Cert International, Inc;

    • CPSWQ through Enviro Cert International, Inc;

    • A professional in erosion and sediment control through NICET

  • QSD training course and state exam

Qualified SWPPP Practitioner

  • One of the following professional certifications;

    • CESSWI through Enviro Cert International, Inc;

    • CISEC through Certified Inspector of Sediment and Erosion Control, Inc

  • QSP training course and state exam