prop65limits.com
Proposition 65 Compliance Reference

Prop 65 safe harbor levels, decoded.

Look up NSRL and MADL values in micrograms per day by chemical, CAS number, toxicity endpoint and exposure route — the thresholds that determine when a California Proposition 65 warning is required.

Browse the directoryCancer listings →
Chemicals listed
55
Endpoints
5
NSRL (cancer)
40
MADL (repro.)
15

Browse by toxicity endpoint

Cancer39Cancer & Developmental2Cancer & Reproductive5Developmental6Reproductive3

Chemical directory

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Showing 55 of 55 chemicals

Frequently asked questions

What is a Prop 65 safe harbor level?

A safe harbor level is a daily exposure threshold established by OEHHA. Exposures at or below the level are deemed to pose no significant risk and do not require a Proposition 65 warning.

What is the difference between an NSRL and a MADL?

An NSRL (No Significant Risk Level) applies to cancer endpoints, while a MADL (Maximum Allowable Dose Level) applies to reproductive and developmental endpoints.

Are safe harbor levels in µg/day?

Yes. Safe harbor levels are expressed as micrograms of the chemical per day of exposure (µg/day).

Does this site provide legal advice?

No. This directory is a reference compilation of OEHHA safe harbor levels and is provided for informational purposes only. Consult OEHHA and qualified counsel for compliance decisions.