Engineering Documents

The Engineering Division has a number of applications, submittal forms and informational documents to help you with your building and development needs. If you can't find what you are looking for using the links below, or you have any questions, Engineering Division staff is available to help. Staff is available for consultation and permitting services weekdays (excluding holidays) from 8:00 a.m. to 4:00 p.m. If you have questions about grading and flood plain permits and applications, feel free to contact us for assistance.

Applications (Printable PDF)


  1. Floodplain Management Permit Application (PDF)
  2. Grading Extension Application (PDF)
  3. Grading Permit Application (PDF)
  4. Preliminary Road Exception Application (PDF)

Additional Forms (Printable PDF)

  1. Authorized Agent Form (PDF)
  2. Grading Permit Resubmittal Form (PDF)
  3. Project Guidance for Stormwater Quality Compliance (PDF)

Grading Standards and Technical Information

  1. Grading Permit Guidance & Checklist
  2. 2016 California Building Code (CBC) Appendix J - Grading (PDF)
  3. California Department of Water Resources - Division of Safety of Dams Guidelines Small Dams (PDF)

2023 Napa County Road and Street Standards

  1. Napa County Road and Street Standards - 2023 (PDF)
  2. Applicability of the 2023 Road and Street Standards for Fire Rebuild Projects

Stormwater Quality Compliance Standards and Technical Information

  1. Bay Area Stormwater Management Agencies Association (BASMAA) Post-Construction Manual (PDF)
  2. NCSPPP Erosion and Sediment Control Plan Guidance (PDF)
  3. Standard Erosion Control Best Management Practices (BMPs) Brochure (PDF)

Floodplain Management Standards and Technical Information

  1. FEMA Technical Bulletin 1 (TB1) - Openings in Foundation Walls (PDF)
  2. FEMA TB2 - Flood Resistant Material (PDF)
  3. FEMA TB11 - Crawlspace Construction (PDF)
  4. FEMA Zone A - Base (100-Year) Flood Elevation (BFE) Determination (PDF)
  5. No Rise/No Impact Certification - Floodway development (.DOCX)
  6. Elevation Certificate Template and Instructions - 2023
  7. Dry Floodproofing Certificate for Non-Residential Structures