California Prop 65 Civil Penalties: $2,500 Cap and Cure Options

California Prop 65 civil penalties run up to $2,500 per violation per day, and because each product sold or each person exposed can count as a separate violation, a single day of noncompliance can generate exposure well into six or seven figures. The same ceiling applies to knowingly discharging a listed chemical into a source of drinking water. Enforcement is not limited to government lawyers: any private citizen can bring a case in the public interest after serving a 60-day notice.

The $2,500 Per-Day Cap and How It Multiplies

The statute sets a hard ceiling of $2,500 per day for each violation of either the warning requirement or the drinking-water discharge prohibition.¹ The phrase that matters is “each violation.” A business selling 500 products without proper warnings in a single day faces a theoretical maximum of $1.25 million for that day alone. If a single product contains two listed chemicals and neither is disclosed, that can count as two violations per day.

For ongoing exposures at a physical location, the clock runs as long as people remain exposed without a warning. A restaurant with an uncovered patio near a source of diesel exhaust accumulates violations every day it stays open without posting a notice. The longer a violation persists, the larger the pile grows, which is why early correction matters so much to the final number.

Discharges work the same way. Knowingly releasing a listed chemical into water, or onto land where it will likely reach a drinking-water source, triggers the same $2,500-per-day-per-violation ceiling.²

How Courts Actually Set the Number

The $2,500 cap is the maximum, not the default. A court must weigh seven statutory factors before landing on a penalty amount:¹

The nature and extent of the violation, including how many people were exposed and through what route.
The number and severity of the violations, with concentrations well above safe harbor levels pushing severity higher.
The economic effect on the violator, which allows scaling down a penalty that would immediately bankrupt a small business.
Good faith compliance efforts, such as hiring consultants, commissioning lab testing, or voluntarily reformulating a product, especially when those steps started before the lawsuit.
Willfulness, where evidence that a company knew about the exposure and deliberately skipped the warning tends to push the penalty toward the maximum.
Deterrent effect on the violator and the broader business community.
Any other factor justice requires.

Most cases never reach a verdict. According to a 2018 summary from the California Attorney General’s office, 829 settlements were reached that year with a combined value of roughly $35.2 million, averaging about $42,400 per case. Only about 17% of that total went to actual civil penalties. Roughly 77% covered attorney fees and costs, and the remaining 5% went to payments in lieu of penalties, typically funding supplemental environmental projects.³ For most businesses, the real financial exposure is not the statutory penalty but the legal fees that accumulate on the way to a settlement.

Safe Harbor Levels: The Threshold Defense

A business can avoid liability entirely by showing that the exposure at issue falls below an established safe harbor threshold. For cancer-causing chemicals, the benchmark is the No Significant Risk Level (NSRL). For chemicals that cause reproductive harm, it is the Maximum Allowable Dose Level (MADL). Below the applicable safe harbor level, no warning is required and the discharge rules do not apply.⁴

These thresholds are published in Title 27 of the California Code of Regulations and on the OEHHA website. Not every listed chemical has a published number. Where none exists, the business can establish its own scientifically valid level, but it carries the burden of defending that figure. In any enforcement action, the defendant bears the burden of proving the exposure meets the safe harbor standard.⁵ Most defense strategies begin here: get the testing done, compare the results against the NSRL or MADL, and document everything before a notice ever arrives.

Who Is Exempt

Businesses with fewer than 10 employees are exempt from both the warning requirement and the discharge prohibition.⁶ Government agencies are also exempt. These are blanket exemptions, applying regardless of the chemical or the level of exposure. The employee count trips up growing businesses: compliance obligations attach the moment the tenth employee is hired.

Two situational exemptions sit alongside the categorical ones. Federal law that preempts state warning authority removes the Prop 65 obligation for that exposure. And when a chemical is newly added to the state’s list, businesses get a 12-month grace period before warnings are required.⁵

Who Can Bring a Case

The California Attorney General has primary enforcement authority. District attorneys can bring cases within their own counties. City attorneys in cities with populations above 750,000 can file independently, and city prosecutors in jurisdictions with a full-time prosecutor can bring actions with the district attorney’s consent.¹

The distinctive feature of Prop 65 is that any person can sue in the public interest when government enforcers are not pursuing the violation. These private enforcers, often called private attorneys general, account for the vast majority of cases. The 25% penalty share plus recoverable attorney fees make this work financially viable for plaintiffs’ firms that specialize in the area. Scrutiny can come from anywhere, not just a prosecutor’s office.

The 60-Day Notice and Certificate of Merit

A private party cannot simply file suit. They must first serve a 60-day notice of alleged violation on the business, the Attorney General, and the local district attorney or city attorney where the violation is happening. The notice has to identify the specific chemicals involved and describe how people are being exposed.¹

For warning violations, the notice must include a certificate of merit signed by the attorney (or the noticing party, if unrepresented). The certificate must state that the signer consulted qualified experts who reviewed facts, studies, or data about the exposure, and that based on that review the case is reasonable and meritorious.⁷ The copy served on the Attorney General must attach the supporting factual information, including the identities of the experts. Without a compliant certificate, the private party has no authority to file suit.⁸

The 60-day window also gives public prosecutors first crack at the case. If the Attorney General, a district attorney, a city attorney, or a city prosecutor begins diligently prosecuting the same violation during that window, the private party is barred from proceeding. In practice, government offices rarely take these cases over.

Cure Options That Cap Exposure at $500

Four categories of warning violations come with a built-in escape hatch. If a business receives a 60-day notice for any of these exposures, it can avoid a lawsuit by correcting the problem within 14 days and paying a reduced civil penalty of $500 per facility:

Alcoholic beverages consumed on-site, such as at bars, restaurants, and tasting rooms.
Chemicals formed during cooking in food or drink prepared and sold for immediate consumption, where the chemical was not intentionally added but was created through cooking.
Secondhand tobacco smoke at locations that allow non-employees to smoke on the premises.
Vehicle exhaust in indoor parking facilities for noncommercial vehicles.¹

The $500 base amount is adjusted every five years for inflation, with the first adjustment on April 1, 2019, based on the California Consumer Price Index. If the business corrects the violation and pays within the statutory timeframe, the private enforcer cannot pursue attorney fees, costs, or additional payments.

Retail sellers who receive a 60-day notice about a consumer product exposure get a separate, shorter cure window: five business days to either place the required warning on the product or pull it from shelves.⁹

Who Pays When a Warning Is Missing

The primary obligation to warn for consumer products sits with manufacturers, producers, packagers, importers, suppliers, and distributors. These upstream businesses must either label the product directly or send a written notice and warning materials to the retailer and receive acknowledgment of receipt. Retailers then have to place and maintain whatever warning materials they receive.⁹

This allocation decides who absorbs the penalty. A retailer who never received warning materials from a supplier has a stronger defense than one who received them and failed to post them. Everyone in the supply chain should document every handoff of warning materials, because the paper trail often determines the outcome when a private enforcer appears.

Where the Penalty Money Goes

Seventy-five percent of all civil and criminal penalties collected under Prop 65 flow into the Safe Drinking Water and Toxic Enforcement Fund, which supports OEHHA’s scientific research, maintenance of the chemical list, and development of safe harbor levels.¹⁰ The remaining 25% goes to whoever brought the action. For government cases, that is the Attorney General, the district attorney, or the city attorney. For private cases, the 25% goes to the private enforcer.

Private enforcers can also recover attorney fees on top of the penalty share, under Code of Civil Procedure Section 1021.5. The enforcer must show the action conferred a significant benefit on the public and that the financial burden of enforcement justified a fee award.¹¹ Settlements that produce meaningful warnings or product reformulations are presumed to meet that standard; settlements involving only cosmetic changes generally do not. Fees must be supported by contemporaneous time records, and courts can trim inflated requests. The 25% share plus recoverable fees is what fuels the private enforcement ecosystem, and it explains why attorney fees consumed more than three-quarters of total settlement dollars in 2018.

1
California Legislative Information. California Health and Safety Code HSC 25249-7
2
California Legislative Information. California Health and Safety Code HSC 25249-5
3
California Department of Justice. Proposition 65 Settlement Executive Summary 2018
4
Office of Environmental Health Hazard Assessment. Proposition 65 No Significant Risk Levels NSRLs and Maximum Allowable Dose Levels MADLs
5
California Legislative Information. California Health and Safety Code HSC 25249-10
6
Office of Environmental Health Hazard Assessment. Businesses and Proposition 65
7
California Department of Justice. Regulations – Proposition 65 Private Enforcement
8
Legal Information Institute. California Code of Regulations Title 11 Section 3103 – Effect of Failure to Comply
9
P65Warnings.ca.gov. Frequently Asked Questions for Businesses – Proposition 65
10
California Legislative Information. California Health and Safety Code HSC 25249-12
11
Legal Information Institute. California Code of Regulations Title 11 Section 3201 – Attorneys Fees