Engineering & Conservation Division


Engineering DivisionPlanning, Building & Environmental Services

Application & Permits - Blurred


About Us





Environmental Health

Code Compliance


Engineering Division

About Us:

 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 FEMA Floodplain Management implementation and resources, and implementation of the Napa County Road and Street Standards.

Programs & Services

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 and Grading Ordinance

Issuance of grading permits and inspection of excavation, grading and earthwork construction, including fills and embankments.

Napa County Road and 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.

Pre-Application Meetings 

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 at 707-253-4417.

Useful Links



Engineering services not listed above 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. For specific information you may contact the following:

Public Works: (707) 253-4351

Other Department Information

Environmental House Planning

Current Project Information

Find documents and information about major projects, development applications, and other Department work programs.

Learn more!

in the kitchen muffins

Cottage Food Law

Effective Jan. 1, 2013, State law will allow private homes to be used to prepare and package food products for sale to consumers under certain conditions. To find out more, follow the link below!

Cottage Food

PBES Customer Permit Center

Consolidated Permit Service Center

Enjoy the convenience of having your questions answered about planning, building, environmental health, engineering and conservation (vineyard) issues every day, (M-F 7:30-5:00PM).

More on the Permit Service Center

Well-draw Down for WAA

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).

2014-12-01 Water Availability Analysis FAQ-Comments Received

Where Are We Heading?

Agricultural Protection Advisory Committee (APAC)

The County Executive Officer announces the newly created Napa County Agricultural Protection Advisory Committee. 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.

Agricultural Protection Advisory Committee

Medical Marijuana Leaf

Draft Medical Marijuana Ordinance

An ordinance 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.

Draft Medical Marijuana Ordinance

Interactive Napa County Winery Map

Interactive Napa County Winery Map

Explore wineries within Napa County using an interactive web map

Interactive Napa County Winery Map

Interactive Erosion Control Map

Interactive Napa County Erosion Control Plan Map

Explore pending Erosion Control Plans using an interactive map

Interactive Erosion Control Map