OEHHA 2025 — Nickel and Nickel Compounds (Proposition 65 fact sheet)
The California Office of Environmental Health Hazard Assessment maintains a consumer-facing fact sheet on the Proposition 65 Warnings Website explaining why nickel and nickel compounds carry Prop 65 warnings. The fact sheet announces two distinct Prop 65 listings: the cancer listing covering nickel and nickel compounds as a class (with named target sites of nasal cavity, paranasal sinus, and lungs), and a separate reproductive-toxicity listing restricted to soluble nickel compounds and nickel carbonyl (covering developmental effects during pregnancy and male reproductive effects). The fact sheet is consumer-audience tertiary communication: it does not derive No Significant Risk Levels or Maximum Allowable Daily Levels, and it does not catalogue occurrence values. Its function is to explain the listings to people who encounter a Prop 65 warning label and want to understand the exposure pathways and risk-reduction steps that California identifies as relevant.
Summary
| Item | OEHHA Prop 65 fact sheet position |
|---|---|
| Cancer listing scope | Nickel and nickel compounds (class listing) |
| Cancer target sites named | Nasal cavity, paranasal sinus, lungs |
| Reproductive-toxicity listing scope | Soluble nickel compounds and nickel carbonyl only |
| Developmental effect named | During pregnancy, may affect baby’s development; nickel can pass from mother to baby |
| Male reproductive effect named | Exposure to soluble nickel compounds may harm the male reproductive system |
| Exposure routes named | Inhalation of nickel/nickel compounds or nickel-containing particles; ingestion via swallowing nickel-containing dust |
| Significant exposure sources named | Tobacco smoke and cannabis smoke (active and secondhand); dust and fumes from metal production and processing (welding, electroplating); nickel refineries |
| Sources stated NOT to constitute significant exposure | Normal handling of nickel-containing coins; sealed nickel-cadmium (NiCd) batteries |
| Recommended exposure-reduction actions | Avoid smoking and secondhand smoke; properly handle and recycle NiCd batteries (especially if damaged); minimise dust exposure via hand-washing, wet-mopping or HEPA-filter vacuuming, and damp-wipe dust removal |
| Posted | February 2025 |
Provenance notes
Seven-page PDF capture of p65warnings.ca.gov/fact-sheets/nickel-and-nickel-compounds, archived 2026-06-03 (footer timestamp: 6/3/26, 4:46 PM; site footer copyright ”© 2026 State of California”). The fact sheet body carries an explicit “Posted in February 2025” stamp, which is the publication date recorded here. The fact sheet itself names its underlying scientific sources: the OEHHA “Evidence on the Developmental and Reproductive Toxicant of Nickel and Nickel Compounds” document, the NTP 15th Report on Carcinogens, the ATSDR Toxicological Profile for Nickel, and IARC Monograph Volume 100C (2012). Of these, NTP 15th RoC and ATSDR 2024 are independently ingested in this wiki; the OEHHA reproductive-toxicity evidence document and IARC Vol 100C are not yet ingested and are pending separate manual fetch.
The reproductive-toxicity listing scope is narrower than the cancer listing scope. The cancer listing covers nickel and nickel compounds as a class; the reproductive-toxicity listing is restricted to soluble nickel compounds and nickel carbonyl. This asymmetry is the substantive content of the fact sheet for regulatory readers: nickel metal and insoluble nickel compounds are not on the reproductive-toxicity list, only the soluble-salt subgroup and the volatile carbonyl form are.
The food/dietary nickel pathway is conspicuously absent from the fact sheet’s exposure-route enumeration. Routes named are inhalation, dust ingestion, and tobacco/cannabis smoke. Diet is not on the list. This reflects the fact sheet’s framing of nickel as primarily an inhalation hazard (per the cancer target sites of nasal cavity and lungs) and the OEHHA Prop 65 implementation thresholds being calibrated to inhalation-dominant exposure scenarios; it does not reflect a finding that dietary nickel does not occur. The dietary nickel risk assessment lives in the EFSA CONTAM Panel 2020 update (EFSA 2020), not in this Prop 65 fact sheet.
Implications
Certification: California Prop 65 is one of the operative US sub-federal regulatory frameworks for nickel in consumer products, with warning-label requirements triggered by exposures exceeding the NSRL (for cancer) or MADL (for reproductive toxicity). This fact sheet anchors the existence of both listings; the corresponding NSRL and MADL documents are separate OEHHA publications pending ingest. The reproductive-toxicity listing’s narrow scope (soluble nickel compounds and nickel carbonyl only) is a material distinction for any HMTc-adjacent analysis of nickel speciation in consumer products: a product containing nickel as a metallic alloy or insoluble form does not trigger the reproductive-toxicity arm of Prop 65 on the basis of nickel content alone.
Courses: useful as a one-page consumer-audience anchor explaining why Prop 65 warnings for nickel are framed primarily around occupational and inhalation exposures rather than dietary exposure, and why the reproductive-toxicity warning applies only to a subset of nickel chemistry.
App: low utility — no occurrence data, no thresholds, no matrix-specific guidance. The fact sheet’s risk-reduction recommendations (don’t smoke; recycle NiCd batteries; minimise dust) are consumer-behaviour guidance, not product-formulation guidance.
Wiki pages updated on ingest
Page history
The five most recent substantive edits to this page. The full version history lives in git; when DOI minting comes online (see schema docs), each entry below will also link to a version-pinned DataCite DOI.
| Commit | Date | Description |
|---|---|---|
| 9c0b0a7 | 2026-06-05 | codex fire 2026-06-05: no unclaimed auto-fetched pdfs |