San Diego County health inspectors ordered 524 food facilities closed in 2025, up from 285 in 2022. Vermin accounted for 442 of those closures, or 84 percent of the annual total. Through April 9 of this year, inspectors had closed another 150 facilities, 121 of them for vermin.
The closures spanned every tier of the county’s dining market, reaching fine dining rooms inside luxury hotels in the same years as decades-old neighborhood bars and national chain locations. At least one restaurant was closed less than a month after it opened.
Four Years, Nearly Twice the Closures
The county’s closure count has risen in each of the last four years, moving from 285 in 2022 to 374 in 2023, then 508 in 2024 and 524 in 2025. Vermin’s share of the total climbed alongside the raw count, from 74 percent to 84 percent over the same stretch. Vermin-driven closures more than doubled in absolute terms, from 211 to 442. The 2024 jump was the steepest single-year move in the series, adding 134 closures over 2023.
Three Laws Narrowed the Chemical List
California has restricted anticoagulant rodenticides in three separate legislative steps since 2020, and each one removed compounds that food businesses had previously relied on. AB 1788, the California Ecosystems Protection Act, took effect January 1, 2021 and prohibited four second-generation anticoagulant rodenticides statewide, covering brodifacoum, bromadiolone, difenacoum, and difethialone. Second-generation compounds are the potent tier, lethal to a rodent in a single feeding, while older compounds require repeated doses. AB 1322, signed October 13, 2023, added the first-generation compound diphacinone. AB 2552, signed September 25, 2024, extended the prohibition to chlorophacinone and warfarin.
Coverage of the closure data has attributed the 2024 restriction to a second-generation ban, but AB 1322 addressed diphacinone, a first-generation compound. The second-generation prohibition had already been in force for three years by then. The legal toolbox narrowed in three separate moves stretching across five years, and the closure curve climbed through all of them.
Restaurants Sit Outside Every Exemption
The Department of Pesticide Regulation’s guidance to county agricultural commissioners spells out where second-generation compounds remain legal. The list includes food manufacturing and processing plants such as slaughterhouses and canneries, warehouses storing food for human or animal consumption, breweries, wineries, factories tied to food production, and agricultural sites producing horticultural, viticultural, dairy, livestock, poultry, or farm products. Vector control technicians employed by government agencies may apply them for public health purposes, and local health officers can declare emergencies that permit limited application when documented alternatives have failed.
Restaurants without an attached brewery or winery are prohibited from using them. A cannery, a food warehouse, and a brewpub on the same city block retain access to the strongest class of rodenticide available. The full-service restaurant next door does not, while facing the same rat pressure from the same alley and an inspector who can close the dining room over the result. Distribution centers fall outside the exemptions as well, leaving them in the same position as the restaurants they supply.
The Rat Count Nobody Has
Researchers quoted on the county data stopped well short of declaring a rat boom. Niamh Quinn, a vertebrate pest advisor with UC Cooperative Extension, allowed that “if there’s more restaurants being closed because of rats, then it’s not that big of a leap to assume that there may be more rats,” while adding that “we’re very bad at measuring how many rats are in our urban areas.” Eric Middleton, an integrated pest management advisor with the same program, pointed to conditions inside individual restaurants as a stronger driver of closures than outdoor weather patterns. County spokesperson Donna Durckel described the department’s position as ensuring that “facilities have a plan in place to maintain a vermin-free facility and take steps when they find an infestation.”
Pricing a Closure Against a Moving Base Rate
Earlier coverage of individual closure orders and of clusters inside a single district treated a vermin closure as a signal about a particular operator. At 524 closures across a single county in one year, the base rate has moved far enough that one closure carries less diagnostic weight in 2026 than the same event carried in 2022.
The pattern across an operator’s file still matters more than any single event. Repeat orders at the same address, the interval between closure and passing reinspection, and whether corrections were structural or cosmetic all separate an operator with a bad week from an operator with a bad building. A same-day reopening after remediation reads differently from three closures in eighteen months, and that distinction survives the rising base rate. Buyers running due diligence on a San Diego restaurant should pull the full inspection history rather than the headline, as Orange County’s 2026 closure wave already demonstrated.
For owners, the inspection record is a public document that any serious buyer will retrieve. Those planning an exit inside the next two years still have time to build a clean stretch of reinspections before the file reaches a buyer, and a documented eighteen-month run does more for the valuation than any explanation offered across the table.
Sources
- Times of San Diego, “Data: Health inspectors closing more restaurants, often for vermin violations” (2026-07-28)
- California Department of Pesticide Regulation, “New Second Generation Anticoagulant Rodenticide Prohibitions and Allowed Uses”
- California Legislative Information, “AB 1788 (2020), California Ecosystems Protection Act”
- California Legislative Information, “AB 1322 (2023), Second-Generation Anticoagulant Rodenticide and Diphacinone”
- California Legislative Information, “AB 2552 (2024), Anticoagulant Rodenticides”
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