CUPA / Pollution Prevention

The Napa County Division of Environmental Health (NCDEH) is the Certified Unified Program Agency (CUPA) for all cities and areas of Napa County.

  1. 1
  2. 2
  3. 3
  1. Unified Programs
  2. Other Programs
  3. Additional Information

Hazardous Waste Generator (California Health and Safety Code Chapter 6.5)

Hazardous waste is subject to storage time limits and container labeling and management and disposal requirements. There are just under 500 facilities permitted to generate hazardous waste in Napa County that are inspected triennially. For more information please visit the Department of Toxic Substances Control website for Hazardous Waste Generator information.

Underground Storage Tank (California Health and Safety Code Chapter 6.7 and Napa County Code Chapter 16.20)

All underground storage tanks (USTs) are subject to monitoring for leakage. All USTs are inspected annually to verify compliance with state laws, regulations, and permit conditions. All new tanks, tank modifications/repairs, and tank removals/closures are permitted by the NCPBES There are 46 UST facilities in Napa County that are inspected annually. For additional information please visit the State Water Resources Control Board website for USTs.

Above Ground Storage Tank (California Health and Safety Code Chapter 6.67)

As of January 1, 2008 Assembly Bill 1130 transferred the responsibility for the implementation, enforcement and administration of the Aboveground Petroleum Storage Act (APSA) from the State Water Resources Control Board to the CUPA. This law mandates a CUPA to conduct inspections of all facilities that store petroleum products in containers of 55-gallons or greater, including above ground tanks, with a total aggregate quantity of at least 1,320 gallons. This law requires all facilities that store an aggregate quantity of at least 1320 gallons of petroleum/petroleum products including waste oil to submit a storage statement to the CUPA on an annual basis and to prepare a Spill Prevention Control and Countermeasure (SPCC) plan and implement its provisions. 

The exception to this law applies to farms, nurseries, construction sites, or logging sites which are exempt from preparing a SPCC unless the tank is equal to or exceeds 20,000 gallons and the cumulative total capacity is more than 100,000 gallons. However, farms, nurseries, construction sites, or logging sites must conduct daily inspections of containers and tanks containing petroleum, allow the CUPA to inspect the facility, and install secondary containment if the CUPA deems necessary. These facilities are not exempt from federal requirements, only APSA. There are approximately 125 facilities that are inspected triennially. Please visit the State Water Resources Control Board website for more information on ASTs as well as Title 40 - Protection of Environment.

Hazardous Materials Business Plan (California Health and Safety Code Chapter 6.95)

NCDEH Conducts regulatory oversight (review of plans and inspections) of all businesses including farms, federal agencies, state agencies, and local agencies that handle quantities of hazardous materials/ hazardous waste greater than or equal to 55 gallons of liquid, 500 pounds of solids, and 200 cubic feet of a compressed gas at any time. There are an estimated 1,250 facilities throughout Napa County that are subject to the regulatory requirements of this program that are inspected triennially. Please visit the California Emergency Management Agency website for additional information on Hazardous Materials Business Plans.

California Accidental Release Prevention Program (California Health and Safety Code Chapter 6.95)

There are certain regulated substances, known as extremely hazardous substances, that require extensive emergency planning. The most common regulated extremely hazardous substance found in the county requiring a Risk Management Plan (RMP) is anhydrous ammonia. There are over 400 other chemicals that may require a RMP. Businesses that meet threshold quantities specified by U.S Environmental Protection Agency (US EPA) are subject to both state and federal RMP requirements and shall provide their RMP to both the NCDEM and the U.S EPA on the date on which the regulated substance is first present in a process above the federal threshold quantities of the substance. 

Facilities that have regulated substances above the State of California thresholds shall submit a RMP to the NCDEH on the date on which a regulated substance is first present in a process above the state threshold quantities Every three years the owner must certify compliance of their processes and practices and every five years the owner must update their RMP and reevaluate that their process hazard analysis remains current. There are 9 facilities throughout Napa County that are subject to the regulatory requirements of this program that are inspected triennially. Please visit the California Emergency Management Agency website for more information on the California Accidental Release Prevention Program.