How Napa Handles Environmental Rules: A Practical Guide

Napa maintains 100 local ordinances across all categories, and 2 of those deal specifically with environmental rules. Here is a breakdown of what the city actually requires, what is prohibited, and where Napa falls on the strict-to-permissive spectrum compared to other cities.

Stormwater Management

Napa's Storm Water Quality Control ordinance is Chapter 8.36 of the Municipal Code, adopted in June 2004. It implements the city's NPDES Phase II MS4 permit (State Water Board Order 2013-0001-DWQ, NPDES CAS000004) and prohibits illicit discharges and connections to the storm sewer system that drains to the Napa River.

Key details: Code Reference: NMC Ch. 8.36 (June 2004). MS4 Permit: Order 2013-0001-DWQ. NPDES Number: CAS000004. State Law: Water Code 13000+ (Porter-Cologne). Receiving Water: Napa River watershed.

Discharging wash water, paint, oil, sediment, pool water, or any non-stormwater pollutant into a Napa storm drain or gutter violates Sections 8.36.050 and 8.36.060. The Enforcement Official can require a Stormwater Pollution Prevention Plan, issue notices of violation, and refer matters to the Regional Water Board for civil penalties under Water Code 13385.

Flood Zones

Napa's Floodplain Management Overlay District is Chapter 17.38 of the Municipal Code. The city's Special Flood Hazard Areas were last revised by FEMA's post-bypass Letter of Map Revision (LOMR 16-09-1316P), effective January 22, 2019, reflecting completion of the Napa River-Napa Creek Flood Protection Project.

Key details: Code Reference: NMC Ch. 17.38. Current FIRM/LOMR: Eff. Jan 22, 2019 (LOMR 16-09-1316P). Original FIS Date: Sept 26, 2008. CRS Class: 7 (15% SFHA discount). Federal Program: FEMA NFIP.

Building, filling, or substantially improving a structure in a Napa SFHA without a floodplain development permit under Chapter 17.38 violates city code and FEMA's NFIP rules. FEMA can suspend Napa from the NFIP, which would end federally backed flood insurance citywide. The city can require elevation, demolition, or denial of certificates of occupancy.

This is one of the stricter rules in Napa's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

The Bottom Line

Napa's environmental rules rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Napa is broadly strict or permissive.

All of the above reflects Napa's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.