Mercury (methylmercury) (Developmental)
Mercury (methylmercury) is listed under California Proposition 65 for the Developmental endpoint. Its established safe harbor level is 0.3 µg/day as a MADL, determined for exposure primarily via the ingestion route. CAS registry number: 22967-92-6.
Safe Harbor Level
| Field | Value |
|---|---|
| Chemical | Mercury (methylmercury) |
| CAS Number | 22967-92-6 |
| Toxicity Endpoint | Developmental |
| Safe Harbor Basis | MADL |
| Safe Harbor Level | 0.3 µg/day |
| Primary Exposure Route | Ingestion |
What this level means
A MADL is a daily exposure level for Mercury (methylmercury) that — at or below 0.3 µg/day per day — does not require a Proposition 65 warning because it poses no significant risk for the Developmental endpoint. This is the Maximum Allowable Dose Level (MADL) — the daily intake for the reproductive/developmental endpoint.
- Level: 0.3 µg/day per day (MADL).
- Endpoint: Developmental.
- Route: exposure is assessed primarily through the ingestion route.
- CAS: 22967-92-6.
Businesses that expose consumers to more than the safe harbor level for Mercury (methylmercury) must provide a clear and reasonable Prop 65 warning. Compliance is assessed against the applicable OEHHA safe harbor level above; where no safe harbor level is established, an exposure assessment may be required.
Compliance notes
- Compare the daily exposure to the MADL of 0.3 µg/day.
- If exposure exceeds the level, a Prop 65 warning is generally required.
- Confirm the current OEHHA listing and any updates to the level before relying on it — safe harbor levels are amended periodically.
Frequently Asked Questions
What is the Prop 65 safe harbor level for Mercury (methylmercury)?
0.3 µg/day per day (MADL).
What is the CAS number for Mercury (methylmercury)?
22967-92-6.
What endpoint is Mercury (methylmercury) listed for?
Developmental.
What is the primary route of exposure for Mercury (methylmercury)?
The ingestion route.
What is the difference between an NSRL and a MADL?
An NSRL (No Significant Risk Level) applies to cancer endpoints; a MADL (Maximum Allowable Dose Level) applies to reproductive and developmental endpoints.