Prop 65 supplier statement guide for chemical and raw-material suppliers
Brands and retailers push Proposition 65 requests upstream to the supplier who holds the substance-level data. This guide walks through how to issue a defensible Prop 65 statement, screening the material against OEHHA's listed chemicals, comparing expected exposure to the safe-harbor level, and supplying the warning materials and annual renewal the chain of commerce expects.
Operational guide, not legal advice
Answer with the substance-level data, not a boilerplate line
A defensible Prop 65 statement says what the material actually contains, how that compares to the safe-harbor level, and who reviewed it. The strongest suppliers can produce that answer, and the warning materials behind it, the moment a customer asks, without a document hunt.
Why this matters
When a brand or retailer forwards a Prop 65 request, the deadline pressure is theirs but the answer is yours, you are the party with the substance-level data. A statement written from memory, or one that is never renewed, is exactly what a 60-day notice of violation is built to find.
A brand asks for a Prop 65 statement and the supplier answers from a prior email instead of screening the material's actual composition against the current listed-chemical set.
The statement says no listed chemicals are present, but nobody re-checked it after OEHHA updated the list, which happens at least annually.
A listed chemical is present, but no one compared the expected exposure to the applicable safe-harbor level, so the statement cannot say whether a warning is even required.
The supplier agrees to warning language and signs an indemnity, then never sends the written notice plus warning materials or lets the annual renewal lapse.
What Prop 65 actually requires
What the law is
The Safe Drinking Water and Toxic Enforcement Act of 1986, administered by California's Office of Environmental Health Hazard Assessment (OEHHA). It requires a clear and reasonable warning before a business knowingly and intentionally exposes anyone in California to a listed chemical, a warning-and-disclosure obligation, not a ban on selling the substance.
Who is responsible
Section 25600.2 places primary responsibility on product manufacturers, producers, packagers, importers, suppliers, and distributors. Because liability and the burden of proof follow the chain of commerce, brands and retailers push the question up to the supplier who holds the substance-level data.
The list
OEHHA maintains a list of more than 800 chemicals known to cause cancer, birth defects, or other reproductive harm, updated at least annually. A warning obligation for a newly listed chemical takes effect one year after it is listed.
When a warning is required
The warning obligation applies to businesses with 10 or more employees, unless the exposure falls at or below a safe-harbor level. OEHHA has set 300+ safe-harbor levels, No Significant Risk Levels (NSRLs) for carcinogens and Maximum Allowable Dose Levels (MADLs) for reproductive toxicants; at or below the level, no warning is required.
How to build a defensible Prop 65 statement
Use this sequence to turn a Prop 65 request from a scramble into a repeatable statement your quality, regulatory, and commercial teams can stand behind.
01
Pin down what the customer is actually asking
A Prop 65 request can mean several different things. Separate a listed-chemical content declaration from a warning-language commitment, warning materials, and any indemnity before you draft anything.
Exact material, grade, and SKU in scopeWhether they want content, an exposure conclusion, or bothWhether they expect warning materials under Section 25600.2Renewal cadence and acknowledgment-of-receipt expectations
02
Screen the material against the current list
Compare the full composition, including impurities and residuals, not just the intended ingredients, against OEHHA's current list of listed chemicals. The list is updated at least annually, so screen against the current version rather than repeating a prior statement.
Full composition, including impurities and residualsCAS-level match against listed chemicalsThe version and date of the list you screened againstNewly listed chemicals whose one-year warning date is approaching
03
Compare expected exposure to the safe-harbor level
For any listed chemical present, assess whether the expected exposure falls at or below the applicable NSRL for a carcinogen or MADL for a reproductive toxicant. That comparison is what lets the statement say whether a warning is required at all.
The relevant NSRL or MADL, and the endpoint it coversExposure basis and the assumptions behind itCases where no safe-harbor level has been setThe rationale a reviewer would need to defend the conclusion
04
Write the statement and supply the warning materials
State the listed-chemical content and, where the data supports it, the safe-harbor conclusion, with the evidence, reviewer, and effective date attached. Where a warning is required, provide the written notice plus warning materials the downstream business needs so it can pass them along.
Chemical identity by name and CAS numberPresent or absent, with the level basis statedSafe-harbor conclusion, or a clear "warning required"Safe-harbor warning content pointing to www.P65Warnings.ca.gov
05
Renew and re-issue when things change
Under Section 25600.2, written notice plus warning materials are renewed annually with acknowledgment of receipt. Re-issue the statement whenever the formula or a supplier changes, or when OEHHA adds a chemical that reaches your material.
Annual renewal owner and due dateAcknowledgment of receipt kept on fileRe-screen on reformulation or supplier changeVersion history and release approval for every statement
Know why the request landed on you
Prop 65 liability follows the chain of commerce, and it is enforced not only by the state but by private plaintiffs who serve a 60-day notice of violation before suing. Brands and retailers pass the question upstream because you are the party with the substance-level data to answer it.
Section 25600.2 responsibility across the supply chain
60-day notice private enforcement
Customer requests for listed-chemical content and statements
Indemnity and warning-material obligations in supply agreements
Anchor every statement in substance-level evidence
A statement is only as defensible as the data behind it. Tie each conclusion to composition, CAS identity, and the safe-harbor comparison, and keep it consistent with what your SDS Section 15 and technical data already say.
Full composition, impurities, and residuals
CAS and chemical identity for each listed substance
NSRL or MADL comparison and exposure basis
Consistency with the SDS and technical data sheet
Treat the statement as a living record
A Prop 65 statement is not a one-time attestation, the list changes at least annually, formulas change, and the written notice needs annual renewal with acknowledgment. Valent keeps a supplier's listed-chemical status by CAS number review-ready and turns it into a customer-ready statement on request, so the evidence, the review decisions, and the release record are already assembled when a customer, auditor, or regulator asks.
Monitor new listings and their one-year effective dates
Trigger re-issue on reformulation or supplier change
Renew annually and log acknowledgment of receipt
Share the statement through permissioned, gated access while keeping upstream sources private
Checklist
Before the statement goes back to the customer
Use these checks to keep each Prop 65 statement defensible before it leaves your hands.
01
Confirm exactly what each customer is requesting: a content declaration, warning language, warning materials, or an indemnity, plus any renewal terms.
02
Screen the full composition, including impurities and residuals, against OEHHA's current listed-chemical set by CAS number.
03
For each listed chemical present, compare the expected exposure against the applicable NSRL or MADL before concluding whether a warning is required.
04
Write the statement to what the evidence supports, listed-chemical content and a safe-harbor conclusion, with the reviewer, data, and effective date attached.
05
Where a warning is required, send the written notice plus warning materials and record the downstream business's acknowledgment of receipt.
06
Renew the statement annually and re-issue it when the formula changes, a supplier changes, or OEHHA updates the list.
07
Preserve the version history, source evidence, and release approval behind every statement you send.
Be ready before the next customer asks
See how Valent keeps supplier evidence, review decisions, and release records ready, so proving compliance never holds up the business.
