The Engineering Division has the primary responsibility for processing grading and floodplain management permits, evaluating private roadway design and preliminary road exception applications, and enforcing stormwater pollution and prevention measures.
We provide information and assistance to the public regarding compliance with various land development and environmental policies and regulations at the federal, state, and local levels. The Engineering Division is also responsible for the Federal Emergency Management Agency (FEMA) Floodplain Management implementation and resources, and implementation of the Napa County Road and Street Standards.
Engineering services not listed below are part of the Public Works Department. These services include reviewing record map submittal and processing applications for lot line adjustments and certificates of compliance. Additionally, the Engineering division in the Public Works Department will continue to be responsible for maintaining land development records such as record maps and right of way mapping. You may also continue to contact the surveyor via the Public Works Department.
Napa County Floodplain Ordinance
Issuance of floodplain management permits, and the implementation of codes, regulations and standards to reduce the potential for floods, and to minimize the potential for flood-related losses, both public and private, thereby promoting the public health, safety and general welfare of the residents of this County.
Napa County Excavation & Grading Ordinance
Issuance of grading permits and inspection of excavation, grading and earthwork construction, including fills and embankments.
Napa County Road & Street Standards
Evaluation of private roadway design and preliminary road exception applications in accordance with the objectives and design criteria Napa County Road and Street Standards while striving to maintain the preservation of the health, safety, and welfare of the public.
Napa County Stormwater Ordinance
Enforce stormwater pollution and inspect stormwater pollution prevention best management practices in an effort to reduce the adverse effects of polluted runoff discharges to protect and enhance watercourses, fish, wildlife habitat.
Engineering Services staff recommends scheduling a consultation meeting with an Engineer to review your project and ideas, and avoid common submittal and processing pit-falls. To schedule an appointment, please call 707-253-4417.
Current Project Information
Find documents and information about major projects, development applications, and other Department work programs.
Cottage Food Law
Effective January 1, 2013, state law will allow private homes to be used to prepare and package food products for sale to consumers under certain conditions. View the Cottage Food Operations page.
Consolidated Permit Service Center
Enjoy the convenience of having your questions answered about planning, building, environmental health, engineering and conservation (vineyard) issues every day, Monday through Friday, 7:30 a.m. to 5 p.m. View the Online Permit Center for online help.
Update to Water Availability Analysis
A Water Availability Analysis is conducted as part of the discretionary groundwater permit application review process for projects located in the unincorporated county. The proposed changes reflect the guidance staff received from the Board of Supervisors and the Groundwater Resources Advisory Committee (GRAC).
- November 26, 2014 Water Availability Analysis Public Draft (PDF)
- December 1, 2014 Water Availability Analysis FAQ-Comments Received (PDF)
Agricultural Protection Advisory Committee (APAC)
The County Executive Officer announces the newly created Napa County APAC. This ad hoc committee is intended to serve as an advisory committee to the Planning Commission for purposes of making recommendations to the Planning Commission on a variety of winery development and agricultural protection measures.
Draft Medical Marijuana Ordinance
An ordinance (PDF) of the Napa County Board of Supervisor, State of California, adding new County Code Chapter 8.10 to establish reasonable standards for the growing of personal amounts of medical marijuana and expressly banning dispensaries.
Interactive Napa County Winery Map
Explore wineries within Napa County using an interactive winery map.
Interactive Napa County Erosion Control Plan Map
Explore pending Erosion Control Plans using an interactive erosion control map.