California Proposition 65 – 2026 Regulatory Update Regulatory Updates | Certivo Regulations

California Proposition 65 – 2026 Regulatory Update

May 2026

[Public Comment Proposed 2 months ago
OEHHA Notice of Intent to list “welding fumes” as a carcinogen under the Labor Code mechanism; public comment open May 8–June 8, 2026
OEHHA issued a Notice of Intent to list “welding fumes” as a chemical known to the State of California to cause cancer under Proposition 65, using the Labor Code listing mechanism (ministerial listing pathway). OEHHA opened a public comment period running from May 8, 2026 through June 8, 2026. If finalized, the listing would require companies with relevant products/operations (e.g., welding processes, fabricated metal products, equipment, workplace exposures) to assess whether exposures are “significant” and whether Proposition 65 warnings or other risk management actions are needed.

California Proposition 65 California Office of Environmental Health Hazard Assessment (OEHHA) May 8, 2026](https://regulations.certivo.com/california-proposition-65-2026-regulatory-update/2bb01a07-f60f-4c6a-9c23-91463a8b7683)

[Public Comment Proposed 2 months ago
OEHHA issues Notice of Intent to list “welding fumes” as a carcinogen under Proposition 65 (Labor Code mechanism) and opens public comment period
OEHHA published a Notice of Intent (NOI) indicating it intends to list “welding fumes” as a chemical known to the State of California to cause cancer using the Labor Code mechanism incorporated into Proposition 65. OEHHA opened a public comment period (comments due by June 8, 2026). If the listing proceeds, businesses involved in activities, products, or workplaces that may result in significant exposures to welding fumes may need to assess exposure scenarios and potential Proposition 65 warning obligations once any listing becomes effective and applicable warning timelines run.

California Proposition 65 California Environmental Protection Agency, Office of Environmental Health Hazard Assessment (OEHHA) May 8, 2026](https://regulations.certivo.com/california-proposition-65-2026-regulatory-update/25b43638-6c06-4387-a613-379885148ddd)

[Public Comment Proposed 2 months ago
OEHHA opens public comment on Notice of Intent to List hydrochlorothiazide, voriconazole, and tacrolimus as carcinogens (Labor Code mechanism)
OEHHA published a Notice of Intent to List (NOIL) indicating it intends to add hydrochlorothiazide, voriconazole, and tacrolimus to the Proposition 65 list as chemicals known to the State of California to cause cancer, using the Labor Code (IARC-based) listing mechanism. OEHHA opened a written public comment period limited to whether IARC sufficiently identified the specific chemicals as human/animal carcinogens. Compliance teams should monitor this action because a final listing would trigger downstream Proposition 65 evaluation and, where applicable, warning/notification obligations for products or exposures involving these substances once listed.

December 2025

[Public Comment Proposed 7 months ago
OEHHA issues request for relevant information on carcinogenicity of ethoprop (potential delisting review)
OEHHA posted a Request for Relevant Information on the carcinogenicity of ethoprop, indicating the chemical is being referred to the Carcinogen Identification Committee (CIC) for review for possible delisting from the Proposition 65 list. This is not a final delisting, but it is an official step in the delisting evaluation process and invites stakeholders to submit relevant data within OEHHA’s stated information-request window. Compliance teams tracking Proposition 65-listed substances should monitor this proceeding because it could eventually change listing status and related warning/enforcement exposure for ethoprop.

California Proposition 65 California Office of Environmental Health Hazard Assessment (OEHHA) Dec 19, 2025](https://regulations.certivo.com/california-proposition-65-2026-regulatory-update/254acc1b-c53b-4adf-b9b5-f645e0b3d2cc)

[Public Comment Proposed 7 months ago
OEHHA request for relevant information on carcinogenicity of ethoprop (potential delisting review)
OEHHA issued a request for relevant information regarding the carcinogenicity of ethoprop as part of the Proposition 65 Carcinogen Identification Committee (CIC) process, indicating a potential delisting review pathway. Compliance teams that manufacture, distribute, or sell products that may involve ethoprop should monitor this review because a future delisting decision could change warning obligations, but no delisting has occurred at this stage.

California Proposition 65 California Environmental Protection Agency, Office of Environmental Health Hazard Assessment (OEHHA) Dec 19, 2025](https://regulations.certivo.com/california-proposition-65-2026-regulatory-update/efa1a037-a08b-4794-bbd3-0a49976c5d11)

[Public Comment Proposed 7 months ago
OEHHA request for relevant information on carcinogenicity of ethoprop (potential delisting review)
OEHHA issued a request for relevant information regarding the carcinogenicity of ethoprop in connection with a Carcinogen Identification Committee (CIC) review that could result in a potential delisting under Proposition 65. Compliance teams should monitor this proceeding because a delisting could change warning/settlement exposure for products/operations involving ethoprop; however, no delisting decision is indicated in the provided sources.

[Public Comment Proposed 7 months ago
OEHHA issues request for relevant information on carcinogenicity of ethoprop (CIC review for possible delisting)
OEHHA posted a request for relevant information on the carcinogenicity of ethoprop and indicated the substance is being referred to the Carcinogen Identification Committee (CIC) for review for possible delisting. This initiates a stakeholder input/data submission process that could ultimately lead to a delisting decision. Compliance teams using ethoprop in products or operations should monitor the review, consider submitting relevant toxicology/exposure data, and be prepared to adjust Prop 65 warning determinations if OEHHA proceeds with delisting or maintains the listing.

[Substance Addition Live 7 months ago
OEHHA adds N-methyl-N-formylhydrazine to the Proposition 65 list as a chemical known to cause cancer
OEHHA added N-methyl-N-formylhydrazine to the Proposition 65 list as a chemical known to cause cancer (effective December 8, 2025). Compliance teams should evaluate whether products, emissions, or workplace activities could expose individuals in California to this substance and whether Prop 65 warnings or exposure assessments are required.

California Proposition 65 California Office of Environmental Health Hazard Assessment (OEHHA) Dec 8, 2025](https://regulations.certivo.com/california-proposition-65-2026-regulatory-update/283c4c2c-56b5-48ba-8dfd-8a84b1005775)

[Deadline Update Live 7 months ago
OEHHA adds warning requirement effective date for N‑methyl‑N‑formylhydrazine listing (warnings required starting Dec 8, 2026)
OEHHA’s listing notice for N‑methyl‑N‑formylhydrazine indicates that while the chemical was added to the Proposition 65 list as a carcinogen effective December 8, 2025, the warning requirement for significant exposures takes effect on December 8, 2026 (the 12‑month grace period). Compliance teams should ensure product exposure assessments, labeling/artwork changes, online warning updates, and supply-chain communications are completed ahead of the December 8, 2026 warning-trigger date for this substance.

[Substance Addition Live 7 months ago
OEHHA adds N‑methyl‑N‑formylhydrazine to Proposition 65 list as a carcinogen (effective Dec 8, 2025)
OEHHA added N‑methyl‑N‑formylhydrazine to the Proposition 65 list as a chemical known to cause cancer. Businesses selling products in California should evaluate whether the chemical is present in products or workplace/consumer exposure scenarios and determine if Prop 65 warning, reformulation, or exposure mitigation actions are needed based on anticipated exposure pathways.

[Guidance Update Live 7 months ago
OEHHA republishes the current Proposition 65 chemical list dated Dec 5, 2025 (official downloadable list files)
OEHHA posted the latest consolidated 'Proposition 65 List' package (dated December 5, 2025) with downloadable formats (e.g., PDF/Excel/CSV). While this is not itself a new restriction, it is the authoritative consolidated reference used for Prop 65 applicability determinations; compliance teams should use this version (or any newer posted version) as the controlled reference for internal chemical screening and compliance checks.

California Proposition 65 California Office of Environmental Health Hazard Assessment (OEHHA) Dec 5, 2025](https://regulations.certivo.com/california-proposition-65-2026-regulatory-update/b70cebb3-cb53-47f2-a570-d4aacac855eb)

[Guidance Update Live 7 months ago
OEHHA posts Proposition 65 list downloads reflecting the current list dated Dec 5, 2025
OEHHA updated/posted the current Proposition 65 chemical list download resources (PDF/Excel/CSV) on its Proposition 65 List webpage, with the list date shown as December 5, 2025. Compliance teams can use these official files as the authoritative reference for verifying whether a substance is listed and for maintaining internal restricted-substance/warning determinations.

[Regulation Change Live 7 months ago
OEHHA adds developmental toxicity endpoint to the existing Proposition 65 reproductive toxicity listing for bisphenol S (BPS)
OEHHA expanded the scope of the existing Proposition 65 reproductive toxicity listing for bisphenol S (BPS) by adding the developmental toxicity endpoint (effective December 8, 2025) via the State’s Qualified Experts mechanism (DARTIC). Compliance teams should reassess whether exposures to BPS trigger Prop 65 warning obligations considering the expanded reproductive toxicity endpoint and ensure warnings/supply chain communications remain accurate.

[Substance Addition Live 7 months ago
OEHHA adds developmental toxicity endpoint to Bisphenol S (BPS) Proposition 65 listing (effective Dec 8, 2025)
OEHHA issued a listing notice expanding the existing Proposition 65 reproductive toxicity listing for Bisphenol S (BPS) by adding the developmental toxicity endpoint. This change means Prop 65 warnings/enforcement considerations for BPS exposures now explicitly include developmental toxicity, in addition to previously covered reproductive toxicity endpoints, affecting product hazard assessments and warning determinations for businesses selling into California.

September 2025

[Regulation Change Live 10 months ago
CPPA/OAL approve finalized CCPA regulations package covering cybersecurity audits, risk assessments, and ADMT (plus updates to existing CCPA regs)
The CPPA announced approval of a major CCPA/CPRA regulations package (approved by OAL) that includes requirements and frameworks for cybersecurity audits, risk assessments, and rules governing automated decisionmaking technology (ADMT), along with updates to existing CCPA regulations. This is directly relevant to Vendor Cybersecurity & Data Privacy because these obligations commonly flow down into vendor/service-provider governance: businesses will need stronger documentation of cybersecurity programs, assessment processes, audit readiness, and risk management for processing activities often performed by vendors (e.g., cloud/SaaS processors). The CPPA announcement states an effective date of Jan 1, 2026, with staged compliance timelines referenced for audit certifications, risk assessment submissions/attestations, and ADMT significant-decision obligations.

California Consumer Privacy Act (CCPA) / California Privacy Rights Act (CPRA) regulations (CPPA) California Privacy Protection Agency (CPPA) / California Office of Administrative Law (OAL) Sep 23, 2025](https://regulations.certivo.com/california-proposition-65-2026-regulatory-update/4f1d8663-2f94-4ce1-9159-e1a1ec5a15f8)

[Public Comment Proposed 10 months ago
OEHHA proposes NSRL safe harbor levels for 1‑bromopropane and diethanolamine (dermal) and extends comment deadline
OEHHA issued a proposed rulemaking to amend Title 27, California Code of Regulations, section 25705 (No Significant Risk Levels for carcinogens) to add new safe harbor NSRLs: 1‑bromopropane at 54 µg/day and diethanolamine (dermal exposure only) at 6.4 µg/day. OEHHA also issued an extension notice moving the public comment deadline to November 7, 2025. If finalized, these NSRLs would affect Proposition 65 warning determinations and risk assessments for products or workplaces involving these substances, particularly for dermal exposure scenarios for diethanolamine.

California Proposition 65 California Environmental Protection Agency – Office of Environmental Health Hazard Assessment (OEHHA) Sep 19, 2025](https://regulations.certivo.com/california-proposition-65-2026-regulatory-update/7157ab66-d45f-402f-a42f-7d32efd33d6c)

August 2025

[Public Comment Proposed 11 months ago
OEHHA Notice of Proposed Rulemaking to amend 27 CCR §25705(b) to add proposed NSRLs for 1-bromopropane and diethanolamine (dermal)
OEHHA issued a Notice of Proposed Rulemaking to amend Title 27 of the California Code of Regulations, section 25705(b), to add new No Significant Risk Levels (NSRLs) used as Proposition 65 cancer “safe harbor” exposure levels. The proposal would add an NSRL of 54 µg/day for 1-bromopropane and an NSRL of 6.4 µg/day for diethanolamine for dermal exposure only (explicitly not applicable to other exposure routes). OEHHA’s notice sets a public comment deadline of October 6, 2025, and provides that a public hearing will be held only if requested by September 22, 2025. Compliance teams may wish to submit comments and, if adopted, consider how these NSRLs affect internal Prop 65 exposure assessments and warning determinations.

California Proposition 65 California Office of Environmental Health Hazard Assessment (OEHHA) Aug 22, 2025](https://regulations.certivo.com/california-proposition-65-2026-regulatory-update/09d283b1-bca6-4d93-ae59-0c4d0b47902e)

March 2025

[Substance Addition Live Mar 7, 2025
OEHHA adds vinyl acetate to the Proposition 65 list as a chemical known to cause cancer (warnings enforceable starting Jan 3, 2026)
OEHHA listed vinyl acetate under Proposition 65 as a chemical known to cause cancer (listing effective January 3, 2025). The Prop 65 warning requirement for significant exposures becomes enforceable starting January 3, 2026 (one-year grace period typical for new listings). Compliance teams should assess products/operations that may expose California consumers/workers to vinyl acetate and implement compliant Prop 65 warnings and related substantiation/documentation before the enforceability date.

California Proposition 65 California Office of Environmental Health Hazard Assessment (OEHHA) Mar 7, 2025](https://regulations.certivo.com/california-proposition-65-2026-regulatory-update/0e3d60be-196f-45d3-91f0-e8b4d5a082f7)

January 2025

[Substance Addition Live Jan 17, 2025
OEHHA lists vinyl acetate as known to cause cancer under Proposition 65 (effective Jan 3, 2025)
OEHHA issued an official notice listing vinyl acetate on the Proposition 65 list as a chemical known to the State of California to cause cancer. Businesses whose products or operations may result in consumer or occupational exposures to vinyl acetate in California should evaluate whether warnings are required and update compliance documentation and supplier inquiries accordingly.

California Proposition 65 California Office of Environmental Health Hazard Assessment (OEHHA) Jan 17, 2025](https://regulations.certivo.com/california-proposition-65-2026-regulatory-update/1e5d7842-1c87-4e96-8d6d-8ebb770e64c2)

[Substance Addition Live Jan 3, 2025
OEHHA adds vinyl acetate to Proposition 65 list as a carcinogen; warnings required for significant exposures starting Jan 3, 2026
OEHHA has added vinyl acetate to the Proposition 65 list as a chemical known to the State of California to cause cancer. For compliance teams, this triggers the one-year lead time before consumer-product/occupational exposure warnings are required for significant exposures. Businesses selling products into California should evaluate potential exposures to vinyl acetate and update Proposition 65 warning determinations and labeling/online warning content by the stated warning-effective date.

California Proposition 65 California Office of Environmental Health Hazard Assessment (OEHHA) Jan 3, 2025](https://regulations.certivo.com/california-proposition-65-2026-regulatory-update/d7dc4a05-cfc9-4eb4-a44f-3d571a18d3e3)