California Proposition 65 & Brass Fittings: Complete Guide

California Proposition 65 is the most aggressively enforced product chemicals regulation in the United States. Any brass fitting sold in California that contains lead — virtually all standard grades do — requires a specific warning label unless the seller can demonstrate that exposure falls below the Maximum Allowable Dose Level (MADL). This guide tells you exactly what is required, why, and what your supplier should provide.

What Is Proposition 65?

California Proposition 65 — formally the Safe Drinking Water and Toxic Enforcement Act of 1986 — is codified at California Health and Safety Code Sections 25249.5 et seq. It was passed by California voters as a ballot initiative in November 1986 and has been in effect since February 1987.

The law requires the State of California to publish a list of chemicals "known to the State of California to cause cancer, birth defects, or other reproductive harm." Businesses with 10 or more employees must provide a "clear and reasonable warning" before knowingly and intentionally exposing any individual to a listed chemical. Businesses must also not discharge listed chemicals into drinking water sources.

Proposition 65 is administered by the California Office of Environmental Health Hazard Assessment (OEHHA). The current list contains over 900 chemicals. The list is updated at least annually and whenever OEHHA determines a new chemical meets the listing criteria.

The Prop 65 List — Chemicals Relevant to Brass Fittings

Of the 900+ chemicals on the Prop 65 list, the following are directly relevant to brass, copper and aluminium fittings:

The primary concern for standard brass fittings is lead. CW617N contains approximately 2% lead — far above any safe harbour threshold. The Prop 65 obligation for lead arises not from the composition of the fitting alone, but from the potential for lead exposure to consumers who handle or use the fitting.

Who Must Comply with Prop 65?

Prop 65 applies to any business with 10 or more employees that:

• Manufactures, distributes, or sells products containing listed chemicals
• In the course of doing business in California
• Where those listed chemicals may expose individuals

Importantly, Prop 65 applies to the seller in the California supply chain — not to the overseas manufacturer. However, overseas manufacturers who export products to California are practically affected because their California buyers (importers, distributors, retailers) will demand compliance documentation, and increasingly foreign manufacturers list themselves directly on product labels or provide warnings at export.

Private enforcement plays a major role — "Prop 65 bounty hunters" (plaintiff attorneys) can sue businesses for violations without government involvement. Violators face civil penalties of up to $2,500 per day per violation.

The Warning Requirement

Under Prop 65, a warning is required when a business knowingly and intentionally exposes an individual to a listed chemical. The key question is: what level of exposure triggers the warning?

Prop 65 provides an affirmative defence: no warning is required if the exposure level is below the established "safe harbour" level:

• For carcinogens: the No Significant Risk Level (NSRL) — the level causing no more than 1 excess cancer per 100,000 exposed individuals over a 70-year lifetime
• For reproductive toxicants: the Maximum Allowable Dose Level (MADL) — 1,000 times the No Observable Effect Level (NOEL)

For lead (a reproductive toxicant): the MADL is 0.5 micrograms per day (0.5 µg/day). This is the exposure level (not the content level) below which no warning is required. For a brass plumbing fitting, the relevant exposure is the amount of lead that migrates from the fitting into water — not the total lead content of the brass alloy body.

Required Warning Text (Post-August 2018)

On August 30, 2018, California updated its Prop 65 warning requirements under Title 27 California Code of Regulations (CCR), Article 6. Warnings must now meet specific safe harbour content and format requirements. The new "short-form" warning for lead:

The warning must include the yellow triangle warning symbol (⚠) when displayed visually. It can be provided on: the product label, the packaging, a posted sign at point of display or sale, an online product listing, or a general warning prominently displayed on a business website. For B2B sales, warnings are often passed through the supply chain via sales documentation, safety data sheets, or written compliance statements.

Safe Harbour Limits Relevant to Brass

The MADL of 0.5 µg/day for lead is extremely low. To put it in context: a person drinking two litres of water per day at the US EPA action level for lead in water (15 ppb) would ingest 30 µg/day of lead. The Prop 65 MADL is 60× more stringent than the EPA action level. This means that even fittings that leach very low amounts of lead — amounts that pass NSF/ANSI 61 — can still technically require a Prop 65 warning.

NSF/ANSI 61 and NSF/ANSI 372 Connection

Two NSF/ANSI standards are directly relevant to brass fittings sold for potable water use in the United States:

NSF/ANSI 61 — Drinking Water System Components

NSF/ANSI 61 is the primary standard for health effects of products that contact drinking water. Testing involves exposing the product to water under specified conditions and analysing the resulting water for contaminants. Products that pass NSF/ANSI 61 have demonstrated that contaminant concentrations in the resulting water do not exceed established health-based limits.

Passing NSF/ANSI 61 does not automatically satisfy Prop 65 requirements. NSF/ANSI 61 limits are based on EPA health effects thresholds; Prop 65 uses OEHHA MADL values which are often more stringent. A fitting can pass NSF/ANSI 61 and still technically require a Prop 65 warning if lead leaching exceeds 0.5 µg/day for the intended use scenario.

NSF/ANSI 372 — Lead Content of Drinking Water System Components

NSF/ANSI 372 establishes lead content requirements for "lead-free" designation under the Reduction of Lead in Drinking Water Act (amendment to the Safe Drinking Water Act, effective January 4, 2014). Under this law and NSF/ANSI 372, "lead-free" for plumbing fittings and fixtures means a weighted average lead content of ≤0.25% in the wetted surface materials.

Important: "lead-free" under NSF/ANSI 372 (≤0.25% weighted average) is not the same as "zero lead." CW602N DZR brass (0.2–0.3% Pb) may or may not meet the 0.25% weighted average threshold depending on the geometry of the fitting and the proportion of wetted surface area. A full NSF/ANSI 372 calculation is required for each fitting specification.

Federal "Lead-Free" Law — Safe Drinking Water Act Amendment

The Reduction of Lead in Drinking Water Act (Public Law 111-380, January 2011, effective January 4, 2014) amended the Safe Drinking Water Act (SDWA) to restrict the sale of lead-containing plumbing products for potable water use. "Lead-free" under this federal law means:

• Solder and flux: <0.2% lead
• Pipes, pipe fittings, plumbing fittings, and fixtures: ≤0.25% weighted average lead content of the wetted surface

This federal law supersedes state laws in many respects. It means that standard CW617N brass (~2% Pb) cannot be used in potable water fittings sold in the US — regardless of state. Products for potable water must use low-lead alloys meeting the 0.25% weighted average requirement. CW602N (~0.2–0.3% Pb) may meet this requirement depending on fitting geometry; purpose-made "lead-free" brass grades (e.g. silicon brass CW724R, <0.09% Pb) will reliably meet it.

Enforcement — How Prop 65 Actually Works

Prop 65 is unique in that it allows private plaintiff enforcement. Any individual or entity acting in the public interest can sue a business for a Prop 65 violation, without needing to demonstrate personal harm. The business must pay:

• Civil penalties up to $2,500 per day per violation
• Attorney's fees (which creates a financial incentive for plaintiff attorneys)
• Up to 25% of penalties in "bounty" to the citizen plaintiff

The California Attorney General can also bring enforcement actions. OEHHA tracks compliance and publishes enforcement notices. Proposition 65 private suits are a significant compliance risk for importers and distributors of brass fittings — especially those selling through Amazon, Home Depot, or other large retail channels where product listings are easily scrutinised.

Prop 65 Impact by Brass Alloy

Brassland's Position & Available Documentation

Frequently Asked Questions

This guide is informational and does not constitute legal advice. Proposition 65 requirements are complex and fact-specific. Consult with a qualified Prop 65 attorney for compliance decisions specific to your products and market. Last updated: May 2026. OEHHA chemical list and safe harbour numbers should be verified against current OEHHA publications before making decisions.