CA Proposes New NSRL Levels

The California Office of Environmental Health Hazard Assessment (OEHHA) has proposed new No Significant Risk Levels (NSRLs) under Proposition 65 for two chemicals: 1-bromopropane (1-BP) and diethanolamine. These proposed changes would amend Title 27, Section 25705(b)(1) of the California Code of Regulations.

Proposed NSRL Values

OEHHA’s proposed safe harbor levels are as follows:

• 1-Bromopropane (1-BP): 54 micrograms per day
• Diethanolamine (dermal exposure only): 6.4 micrograms per day

⚠️ Note: The proposed level for diethanolamine applies exclusively to dermal exposure and does not apply to other routes such as inhalation or ingestion. If exposures to these chemicals remain below the proposed NSRLs, businesses would not be required to provide Proposition 65 warnings.

Public Comment Period Now Open

OEHHA is inviting public input on the proposed NSRLs:

• Comment Period: August 22 – October 6, 2025
• Submission Method: Electronically via the OEHHA comment portal

All comments will be published on OEHHA’s website after the consultation closes.

Supporting Materials for Review

OEHHA has released several documents to assist stakeholders:

• Notice of Proposed Rulemaking
• Initial Statement of Reasons
• Draft Regulatory Text

These resources provide the scientific and regulatory rationale for the proposed exposure limits.

Next Steps for Businesses

Companies that use or handle these chemicals should:

1. Review the proposed NSRLs and assess how they might affect labeling or exposure control strategies.
2. Submit comments by the October 6, 2025 deadline, particularly if the changes could impact operations.
3. Monitor OEHHA’s website for updates and published stakeholder feedback.

Why NSRLs Matter?

NSRLs serve as safe harbor thresholds under Proposition 65. Staying below these levels can:

• Eliminate the need for warning labels
• Reduce regulatory risk
• Support consumer confidence in product safety

Reference: OEHHA Proposed NSRL Rulemaking