California v. McWane (AB&I) 2022 — Prop 65 hexavalent chromium air-emissions complaint

This 11-page civil complaint, filed on 15 February 2022 by California Attorney General Rob Bonta in Alameda County Superior Court, alleges that McWane, Inc. (operating in East Oakland under the fictitious business name AB&I) has violated California Proposition 65, the Unfair Competition Law, and Government Code § 12607 by emitting hexavalent chromium from its cast-iron pipe foundry without providing the clear and reasonable warning required by Health & Safety Code § 25249.6 to nearby residents, schoolchildren, and workers. The complaint quantifies facility-wide Cr-VI emissions at 1.41 pounds per year (1.17 lb/yr from pipe casting and 0.13 lb/yr from molding operations) from the April 2021 BAAQMD draft Health Risk Assessment, identifies AB&I as the largest Cr-VI emitter in Alameda County and one of the top ten in the nine-county BAAQMD region, and references the BAAQMD HRA’s estimate of 22-in-a-million resident cancer risk attributable to the facility. The Prop 65 No Significant Risk Level for Cr-VI is the second-lowest NSRL set by OEHHA for any listed carcinogen (only dioxin is lower), at 0.001 µg/day.

Key numbers

Hexavalent chromium emission rates from AB&I Foundry — ¶ 31 (page 8), citing BAAQMD draft April 2021 Health Risk Assessment

The complaint describes the pipe-casting machines as the largest contributing source within the facility and notes that they have no emission controls, with emissions released directly to the atmosphere through roof vents.

BAAQMD draft Health Risk Assessment quantification — ¶ 31 (page 8)

California Proposition 65 Cr-VI regulatory framework — ¶¶ 20–22 (pages 5–6)

Demographic and exposure context — ¶ 2 (page 2) and ¶ 32 (page 8), citing CalEnviroScreen 4.0

Procedural and statutory facts — ¶¶ 5–13 (pages 2–4), ¶ 33 (page 8), and the Prayer for Relief (page 11)

Methods (brief)

This is a civil enforcement complaint, not a primary analytical study. The substantive numerical facts the complaint relies on derive from secondary regulatory documents that are referenced but not attached:

• BAAQMD draft Health Risk Assessment (April 2021) is the source of the per-source emission rates (pipe-casting machines 1.17 lb/yr, molding 0.13 lb/yr, facility 1.41 lb/yr) and the 22-in-a-million resident cancer-risk estimate. The complaint does not reproduce the HRA’s underlying ambient-monitoring or stack-test methodology, exposure-pathway modelling, source-receptor relationships, or risk-assessment assumptions; it cites the HRA’s headline numbers descriptively at ¶ 31.
• OEHHA Prop 65 Cr-VI NSRL of 0.001 µg/day is cited per Cal. Code Regs., tit. 27, § 25705, subd. (b). The complaint does not reproduce the OEHHA derivation methodology for the NSRL (the underlying cancer slope factor, the unit-risk inhalation-route calculation, or the “no significant risk” 10⁻⁵ lifetime-cancer-risk assumption Prop 65 uses to back-calculate the safe-harbor daily dose).
• CalEnviroScreen 4.0 ranking for the East Oakland census tract is cited via a URL footnote to oehha.ca.gov/calenviroscreen/report/calenviroscreen-40; the complaint does not reproduce the underlying pollution-burden and population-characteristics composite-index methodology.
• AB&I rank among Alameda County and BAAQMD Cr-VI emitters (¶ 29) is asserted without an explicit ranked-list citation, but is consistent with publicly-reported BAAQMD facility-level emissions inventories.

The complaint itself contains no original ambient-air or stack-emission measurements, no analytical-method statements, and no laboratory-instrument detail. Its evidentiary register is the AG’s pleading-stage characterisation of the regulatory record assembled by BAAQMD and OEHHA.

Implications

• Regulatory baseline (US-CA, hexavalent chromium under Proposition 65, 2022). The complaint documents the operative California regulatory framework for Cr-VI as of February 2022: dual Prop 65 listings (cancer, 27 February 1987; developmental and reproductive toxicity, 19 December 2008) and the NSRL of 0.001 µg/day under Cal. Code Regs., tit. 27, § 25705, subd. (b). The NSRL is the second-lowest set by OEHHA for any listed carcinogen, with only dioxin lower. For HMI work on the chromium-hexavalent page’s regulatory-limits section and on any future oehha-chromium-vi-prop65 regulation page (not yet created in wiki/regulations/), this complaint is a date-anchored primary record of the operative California NSRL value and listing dates as the California AG’s office relied on them in active enforcement litigation.

• Regulatory baseline (US-CA, Prop 65 environmental-exposure enforcement against industrial stationary sources, 2022). The complaint is a primary record of how the California AG operationalises Proposition 65 against industrial stationary-source emissions (as distinct from consumer-product warnings, which dominate the Prop 65 enforcement landscape). The framework invoked: environmental-exposure warnings must be “provided in a conspicuous manner… likely to be seen, read, and understood by an ordinary individual in the course of normal daily activity” (Cal. Code Regs., tit. 27, § 25601, subd. (d)), with the operative form of warning being “a notice mailed, sent electronically, or otherwise delivered to each occupant in the affected area,” clearly identifying the source, including a map of the affected area, provided at least every three months, and provided in English and any other language ordinarily used by the facility to communicate with the public (id. at § 25604, subd. (a)(2)). This is the regulatory analog, on the environmental-exposure side, to the consumer-product on-label warning regime that anchors most Prop 65 enforcement in the HMI corpus. The same Cr-VI NSRL of 0.001 µg/day applies regardless of exposure route.

• Regulatory baseline (US-CA, Cr-VI inhalation carcinogenic potency framing). The complaint’s characterisation of Cr-VI as “5,000 times more potent than benzene” as an inhalation carcinogen (¶ 3) anchors the comparative-potency framing the AG’s office uses to justify the unusually low Cr-VI NSRL. For HMI work on the chromium-hexavalent page’s toxicology section, this is a useful comparative anchor against the better-known benzene unit-risk literature. The complaint does not cite the underlying inhalation-unit-risk values for either chemical.

• Environmental-justice context. The complaint is explicit that the enforcement target is an industrial source in a census tract that ranks adversely affected by pollution beyond 91% of California, has the highest asthma-related emergency-department visit rate in the state, is 85% below the poverty line, and is 66% Latinx and 21% African American. This is relevant to any HMI synthesis work on the disproportionate-exposure framing the Prop 65 regulatory regime is designed to address; the operative legal mechanism (warning-based, not limit-based, for environmental exposures) and its practical implications for facility-line communities are documented here in primary form.

• Out of HMI food-and-supply-chain scope. The complaint addresses ambient-air Cr-VI emissions from a cast-iron pipe foundry, not food contamination or food-supply-chain exposure. The substantive evidence does not contribute to ingredient contamination_profile data, product-page Literature Evidence Summary tables, or any HMTc-program threshold-setting workflow on the food side. Its value to the corpus is as a regulatory-framework primary source for the California Prop 65 Cr-VI NSRL and for the operational mechanics of California’s industrial-stationary-source environmental-exposure warning regime.

• App. Not relevant to ingredient-level contamination-profile data. Potentially relevant to a future regulatory-overview surface that surfaces the per-jurisdiction Cr-VI regulatory framework (Prop 65 NSRL, listing dates, warning mechanics) to brand-QA and regulatory-affairs users.

• Courses. Useful as a primary-source example for a regulatory-history module covering the application of Proposition 65 to industrial stationary-source emissions (as distinct from consumer-product warnings) and for an environmental-justice module covering how California’s pollution-burden composite indices (CalEnviroScreen) are operationalised in AG enforcement pleadings.

Wiki pages this source may touch

• chromium-hexavalent

Verification notes

• Source identification. California Department of Justice, Office of the Attorney General, “Complaint for Injunctive Relief and Civil Penalties — People of the State of California v. McWane, Inc., individually and doing business under the fictitious name of AB&I, and DOES 1–50,” filed 15 February 2022 in the Superior Court of the State of California, County of Alameda. Signatories on the cover page: Rob Bonta (Attorney General of California), Christie Vosburg (Supervising Deputy Attorney General, SBN 267033), Erin Ganahl (Deputy Attorney General, SBN 248472). Signature on page 11 by Erin Ganahl. Address of record: 1515 Clay Street, 20th Floor, P.O. Box 70550, Oakland, CA 94612-0550. 11 pages. No DOI. The institutional author is recorded as “California Department of Justice, Office of the Attorney General” to match the corpus convention for agency-issued documents (cf. oehha-arsenic-prop65-listing, oehha-cadmium-prop65-evidence-1996, hsn2019-prop65-compliance-requirements for parallel institutional-author treatments).

• Source-tier rationale. evidence_tier: B: per CLAUDE.md Part 13, B-tier covers grey-literature regulatory and enforcement documents issued by named regulatory or law-enforcement bodies. The complaint is the California Attorney General’s pleading-stage civil-enforcement document. The numerical facts it relies on derive primarily from the BAAQMD draft April 2021 Health Risk Assessment (which would itself be A-tier as a primary regulatory document if read directly) and from OEHHA’s Prop 65 Cr-VI NSRL regulation (also A-tier as a codified regulation); the complaint is the AG’s curated re-statement of those underlying primary documents in the service of the enforcement action. The pleading-stage character — allegations not yet adjudicated as of the filing date — is the principal reason for B-tier rather than A-tier classification.

• Source-type rationale. source_type: regulatory: matches the existing handling of state-agency and federal-agency enforcement documents in the corpus. The complaint is a state-Attorney-General-issued civil-enforcement pleading in a Prop 65 / Unfair Competition Law / natural-resources-harm action; the regulatory source-type captures its character as primary regulatory-enforcement record. The corpus does not currently carry a more specific regulatory-enforcement-complaint or civil-litigation-pleading source-type value; regulatory is the closest available match and preserves the agency-authored, enforcement-action character of the document.

• License rationale. us-government-work: court filings by government plaintiffs in their official capacity are public records and not subject to copyright restriction. Consistent with corpus handling of other state-agency-authored documents (cf. oehha-arsenic-prop65-listing, oehha-lead-prop65-listing).

• Frontmatter metals: [Cr-VI] is correct — the complaint addresses hexavalent chromium specifically, not total chromium or Cr(III). The Prop 65 listing under Cal. Code Regs., tit. 27, § 27001, subds. (b) and (c) is for “chromium (hexavalent compounds)” as the cancer-listing chemical and for the same hexavalent-compound class as the developmental/reproductive-toxicity listing. The complaint does not address Cr(III) or total Cr.

• Frontmatter ingredients: [] and products: [] are correct — the complaint addresses ambient-air Cr-VI emissions from industrial foundry operations (pipe casting, molding), not food ingredients or consumer products. The cast-iron pipes, valves, hydrants, fittings, and plumbing products McWane manufactures are industrial plumbing infrastructure rather than food-contact or consumer-direct products in the HMI taxonomy sense; no product slug in the 2026-05-18 taxonomy snapshot covers cast-iron foundry products, and routing to one would mislead the routing layer.

• Frontmatter matrices: [] is correct — the exposure pathway addressed by the complaint is ambient-air inhalation, which is not in the HMI food/biological matrices controlled vocabulary. The Cochrane-corpus matrices vocabulary covers food and biological matrices (rice, infant-formula, fish, blood, urine, breastmilk, etc.); industrial-stationary-source ambient-air emissions to neighbouring residential receptors are out of that vocabulary’s scope.

• Frontmatter jurisdictions: [US-CA] is correct — the complaint is a California state-court action invoking California-statutory authority (Prop 65, the Unfair Competition Law, Gov. Code § 12607). No federal cause of action is pleaded.

• Brand-firewall (Part 12, strict reading locked 2026-05-17). McWane, Inc. and its AB&I division ARE named throughout the page body — this is the explicit Exception 1 to Part 12 (regulatory-event subject): a public-record civil-enforcement complaint filed by the California Attorney General names McWane / AB&I as the defendant, and the entire substantive content of the source document is structured around that named defendant. Framing the page without naming McWane / AB&I would misrepresent the source. The framing is regulatory-event throughout — the page describes the AG’s enforcement action against this specific facility — and does not convert the complaint’s per-source emission numbers into a brand ranking, a per-manufacturer percentile comparison, or a competitive framing. The closest schools (Acorn Woodland Elementary, Encompass Academy) and the named transit landmark (RingCentral Coliseum, formerly Oakland-Alameda County Coliseum) are named as geographic facts in the AG’s environmental-justice characterisation, not as branded product references. Communities for a Better Environment is named as the Prop 65 60-day-notice private enforcer, which is a regulatory-procedural fact in the complaint, not a contamination ranking.

• Wiki/HMTc firewall (Part 2). The page reports what the complaint states without proposing HMTc threshold values, comparing the Prop 65 NSRL to HMTc certification levels, or making consumer-audience risk advisories. The Implications section notes the regulatory-framework relevance for HMI work on the chromium-hexavalent metal page and a potential future Prop 65 Cr-VI regulation page, but does not endorse, critique, or propose HMTc thresholds.

• Regulation-page mapping. The complaint references several regulatory anchors; current taxonomy coverage:

  • The general Prop 65 framework — no umbrella regulations/california-proposition-65 page exists; per-chemical Prop 65 pages exist for [[regulations/oehha-arsenic-prop65]], [[regulations/oehha-cadmium-prop65]], and [[regulations/oehha-lead-prop65]]. A parallel regulations/oehha-chromium-vi-prop65 page is the natural future companion; this complaint, the OEHHA Cr-VI listing notice (27 February 1987 cancer; 19 December 2008 developmental/reproductive), and the NSRL regulation (Cal. Code Regs., tit. 27, § 25705, subd. (b)) would be its initial contributing sources. Per the v2.0 ingest-skill stop conditions, new regulation slugs are not created speculatively by the ingest pass; this is surfaced here for Karen’s regulation-page creation workflow.
  • Cal. Code Regs., tit. 27, § 27001, subds. (b) and (c) (OEHHA Prop 65 Cr-VI cancer and developmental/reproductive listings) — would route to regulations/oehha-chromium-vi-prop65 when created.
  • Cal. Code Regs., tit. 27, § 25705, subd. (b) (Prop 65 Cr-VI NSRL of 0.001 µg/day) — would route to regulations/oehha-chromium-vi-prop65 when created.
  • California Business & Professions Code § 17200 et seq. (Unfair Competition Law) — not in wiki/regulations/; out of HMI direct scope as a general unfair-competition statute rather than a heavy-metals-specific regulation.
  • California Government Code § 12607 (natural-resources protection) — not in wiki/regulations/; out of HMI direct scope as a general environmental-resources statute.

• Date and unit conventions. Emission rates are preserved exactly as the complaint writes them in pounds per year (lb/year) at ¶ 31, page 8, with no conversion to grams or kilograms per year. The Prop 65 NSRL is preserved at 0.001 µg/day (micrograms per day) as the document writes it. The cancer-risk metric is preserved as “22 in a million” exactly as the complaint writes it. The CalEnviroScreen “91%” ranking, the 85% poverty figure, the 66% Latinx / 21% African American demographic breakdown, the ~10 schools figure, and the ~1,000 feet pedestrian-traffic distance are all preserved exactly as the complaint writes them. No transcription rounding or conversion applied.

• Folder context vs document scope. The PDF lives in raw/Manual Fetch Kimi /June 3 Folder/ under the Kimi-agent manual-fetch corpus. The folder name (“June 3 Folder”) is a date-ordered batch label without subject-matter framing; the document’s actual scope is a California state-court Prop 65 civil-enforcement complaint targeting industrial Cr-VI air emissions in East Oakland. The jurisdictions: [US-CA] field correctly captures the California-statutory framework. The MFK_abi-complaint raw_handle matches the source filename ABI Complaint.pdf.

• Near-duplicates. None identified. The complaint is a unique court filing. The companion regulatory primary documents (the BAAQMD draft April 2021 HRA, the OEHHA Prop 65 Cr-VI listing notices, the OEHHA NSRL regulation, the CalEnviroScreen 4.0 documentation, the Communities for a Better Environment 6 October 2021 60-day notice) are referenced descriptively in the complaint but are separate documents that would each be their own source pages if Karen brings them into the manual-fetch queue.

• Raw integrity. raw_sha256: 710fd64baed518c13f71a155fb11b98986702f4fb23ff16da5d7fc02d3e29802 confirmed via shasum -a 256 against the file at raw_path. PDF is 258 KB and 11 pages. All 11 pages render cleanly (cover/caption page; Introduction and Parties; Jurisdiction and Statutory Background for Proposition 65, the Unfair Competition Law, and Gov. Code § 12607; Facts including emission rates and demographic context; First Cause of Action — Failure to Warn; Second Cause of Action — Unfair Business Practices; Third Cause of Action — Harm to Natural Resources; Prayer for Relief and signature block).

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.