Categories of Prop 65 Violations: What Every Business Must Understand

Introduction: Understanding the Real Cause of Prop 65 Violations

California Proposition 65 is one of the most actively enforced consumer protection laws in the United States, with thousands of violations issued annually. Businesses often assume violations are simply related to the presence of listed chemicals. In practice, most violations result from failures in compliance systems rather than the chemicals themselves.

This guide outlines the primary categories of Prop 65 violations, how they occur, and what businesses must address to maintain compliance.

1. Failure to Provide a Required Warning

The most common violation occurs when a listed chemical is present and no “clear and reasonable warning” is provided.

Typical scenarios include:

• Missing product labeling warnings
• No warning on e-commerce listings
• No signage at point of sale

Failure to provide a warning is the leading cause of 60-day notices.

2. Exceeding Safe Harbor Levels (NSRL and MADL)

Violations also occur when exposure levels exceed established safe harbor thresholds.

• NSRL applies to carcinogens
• MADL applies to reproductive toxins

Common examples include lead in supplements, cadmium in chocolate, and acrylamide in processed foods.

3. Improper or Non-Compliant Warning Labels

Providing a warning is not sufficient if the warning does not meet regulatory requirements.

Common deficiencies include:

• Incorrect warning language
• Missing required elements
• Improper placement or visibility
• Failure to identify specific chemicals when required

Regulatory updates have increased enforcement in this category.

4. E-Commerce and Online Warning Failures

Online sales channels are a major focus of enforcement activity.

Typical issues include:

• Warnings not displayed prior to purchase
• Warnings only visible after checkout
• Missing warnings on third-party marketplaces

Online warnings must be clearly presented before the transaction is completed.

5. Failure to Conduct Exposure Assessment

Many businesses assume compliance without performing the necessary exposure evaluation.

Common gaps include:

• No exposure calculations
• No toxicological assessment
• No scientific justification for compliance decisions

Without exposure assessment, compliance cannot be substantiated.

6. Supplier and Supply Chain Failures

Businesses often rely on supplier information that is incomplete or inaccurate.

Examples include:

• Missing supplier disclosures
• Unverified certificates of analysis
• Undetected contaminants in raw materials

Risk transfers through the supply chain if not properly controlled.

7. Testing and Laboratory Deficiencies

Testing must be valid, current, and defensible to support compliance decisions.

Violations occur when:

• No testing is performed
• Non-accredited laboratories are used
• Results are outdated
• No batch or lot monitoring is conducted

ISO 17025-accredited testing is generally expected.

8. Chemical-Specific Enforcement Risks

A large portion of enforcement activity is concentrated on a limited group of chemicals.

• Lead
• Cadmium
• Phthalates (DEHP, DBP)
• PFAS
• Acrylamide

These chemicals are frequently cited due to their presence in common product categories.

9. Occupational and Environmental Exposure

Not all Prop 65 violations are product-related. Some involve workplace or environmental exposure.

Examples include:

• Airborne exposure in facilities
• Industrial operations
• Vehicle emissions in enclosed areas

While less common for consumer brands, these exposures remain enforceable.

10. Documentation and Recordkeeping Failures

Even when businesses are technically compliant, lack of documentation can result in violations.

Common deficiencies include:

• Missing compliance records
• No monitoring logs
• No traceability or batch documentation
• No written justification for compliance decisions

If compliance cannot be demonstrated, it is generally treated as non-compliance.

The Core Insight: Prop 65 Violations Are System Failures

Most violations fall into three primary categories:

• No warning provided
• Incorrect or non-compliant warning
• Lack of defensible documentation

These issues highlight that Prop 65 compliance must be implemented as a structured system rather than a one-time action.

How to Reduce Risk Through System-Based Compliance

Businesses should implement a comprehensive compliance system that includes:

• Product-level chemical risk assessment
• Supplier disclosure and validation processes
• Laboratory testing and verification protocols
• Exposure assessment and threshold comparison
• Warning determination and validation
• Documentation and monitoring systems

Final Takeaway

There are multiple categories of Prop 65 violations, but they generally stem from the absence of a structured compliance system.

Businesses selling into California must ensure that chemical evaluation, warning implementation, and documentation processes are fully integrated and defensible.

Next Steps

A proactive compliance strategy—supported by testing, documentation, and monitoring—is the most effective way to reduce enforcement risk and maintain regulatory alignment.