OEHHA list · July 31, 2026

Prop 65 chemical list checker

Find the Prop 65 chemical before the California buyer does.

Paste names or CAS numbers and see which appear on the OEHHA Proposition 65 list, with the cancer or reproductive listing, the date listed and any NSRL or MADL.

Last updated 2026-09-28. Math runs in your browser, no data leaves your computer.

Paste the components straight from SDS Section 3, a COA or a formulation sheet. The tool checks every line against its copy of the OEHHA Prop 65 list dated July 31, 2026, and nothing you paste leaves the browser.

Up to 300 lines run at once. A line holding several CAS numbers is split into one check per number, because a CAS number is the surest match.

Before the booking, screen the name on the invoice. Shipment pre-check is on the paid plans, from USD 59 a month.

General guidance only. Verify against the cited primary sources before you commit to a shipment, declaration, or contract.

How the match works

A CAS number is matched exactly against the CAS column of the OEHHA file. A name is matched when it equals the listing name, or when the listing name starts with it, so "formaldehyde" finds the listing "Formaldehyde (gas)". The tool also knows the trade names in the Sourzi catalogue, so "caustic soda" resolves to its CAS number before the check runs.

Around one listing in nine carries no CAS number, because it covers a group such as lead and lead compounds or a form such as airborne titanium dioxide. A CAS search can miss those, so when a CAS number misses the tool looks up the names it knows for that number and shows any listing that starts with one of them.

Rows that OEHHA struck out stay in the result with their delisting date, because a customer questionnaire often asks about them. An endpoint struck out on a chemical that stays listed, such as the developmental endpoint of 2,4-D butyric acid, is shown as removed.

Worked example. A white pigment that passed on CAS number

The booking. An importer brings in a rutile titanium dioxide pigment for a US coatings customer that sells into California. The compliance clerk runs the COA's CAS number, 13463-67-7, against the Prop 65 list, finds no row with that number, and writes "not listed" on the customer questionnaire, which looks fine on paper.

The failure. The listing is "Titanium dioxide (airborne, unbound particles of respirable size)", a cancer listing dated 2 September 2011 that OEHHA prints with no CAS number at all. The questionnaire answer is wrong, and the customer's own review will catch it. The choice is simple: correct the questionnaire now, or explain it later.

The fix. Pasting both the CAS number and the name shows the listing, its NSRL of 440 µg/day for particles of 10 micrometers or less and 44 µg/day for 8 micrometers or less, and the note that the listing covers the airborne form only. The importer sends the customer the listing text and lets its counsel decide whether dust from the finished coating can reach that form.

If the same pigment is handled as a powder in your own warehouse, the exposure limit lookup gives the OSHA and Australian dust limits, and the chemical listing flags tool checks the TSCA and AICIS files.

Frequently asked

What is the Prop 65 list?

It is California's list of chemicals known to the state to cause cancer or reproductive toxicity, which OEHHA republishes at least once a year. This tool reads the OEHHA list dated July 31, 2026, which holds 990 rows, including 26 rows that were struck out after the chemical or the endpoint was removed.

Does a listed chemical mean my product needs a Prop 65 warning?

A listing alone does not decide it. Health and Safety Code 25249.6 requires a clear and reasonable warning before a business knowingly exposes someone to a listed chemical, and 25249.10 exempts an exposure that meets the no significant risk test for carcinogens or the no observable effect test for reproductive toxicants. The NSRL and MADL figures in the result are the levels OEHHA has adopted for that test.

What is a safe harbor level?

It is the NSRL for a carcinogen or the MADL for a reproductive toxicant, both stated in micrograms per day. An exposure below the level is treated as meeting the exemption in 25249.10(c). The OEHHA file prints a level only where one has been adopted, so a blank means no level exists yet, not that the chemical is safe at any dose.

When does the warning duty start for a newly listed chemical?

Under 25249.10(b), the warning duty does not apply to an exposure that takes place less than twelve months after the chemical is listed. The tool flags any listing dated within the last twelve months and shows the date the grace period ends.

Are small businesses exempt from Prop 65?

A person employing fewer than 10 employees is outside the definition of a person in the course of doing business in 25249.11(b). That exemption belongs to the business, not the product, so the retailer or brand selling your product in California may still need the warning.

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Related tools

Sourzi shows what official files say. It is not customs or legal advice. For a binding answer, ask a licensed customs broker, a CBP ruling or an Australian Border Force Tariff Advice.

File dates and links are on Data sources.