Complying with new EPA Regulations on Dichloromethane
The EPA has promulgated new regulations on the storage and use of Dichloromethane, also known as Methylene Chloride or DCM. Under the new regulation, established occupational exposure limits (OELs) have been reduced to help protect users from the carcinogenic effects of DCM exposure. All labs that have or use DCM must be in compliance with this regulation.
Compliance Timeline:
| Initial Monitoring | May 5, 2025 |
| Exposure Limits | August 1, 2025 |
| Exposure Control Plan | October 30, 2025 |
| Other Monitoring | Every 5 years or As needed |
Step 1: Elimination and Substitution
Labs are urged to discontinue use of DCM and dispose of their DCM through the Hazardous Waste Program. .
Step 2: Workplace Chemical Protection Program (WCPP)
All researchers unable to eliminate methylene chloride from their processes must adopt a WCPP to help limit lab occupant exposure. This plan must describe the measure(s) the lab will take to reduce possible exposure. WCPP plan elements include:
- Initial monitoring
- Establishment of a regulated area
- Exposure control plan
- Respiratory protection and personal protective equipment (PPE)
- Training
- Periodic monitoring
EH&S Staff will assist with the creation of the WCPP. Please contact ehs@binghamton.edu
Step 3: Exposure Monitoring
One element of the WCPP is exposure control monitoring. This must be completed by May 5, 2025 to ensure any exposure is below the TSCA thresholds.
Initial Exposure Monitoring
A representative sample of lab occupants from each lab who use DCM most frequently will be monitored using chemical badges. The badges will be distributed with a log. The wearer should record in the log each activity they do during the 8 hour monitoring window. Badges must be worn in the "personal breathing zone", usually on the lapel or lab coat pocket, with the white film facing outward.
More details are on the logsheet.
Periodic Exposure Monitoring
If initial monitoring is below OELs, periodic monitoring must be performed every 5 years. If levels are above OELs, more rigorous monitoring will be required.
| Rule | OSHA | New EPA |
| 8-Hour Time Weighted average (TWA) | 25 ppm | 2 ppm |
| 15-Minute Short Term Exposure Limit (STEL) | 125 ppm | 16 ppm |
| Action Level | 12.5 ppm | 1 ppm |
Questions? Contact ehs@binghamton.edu
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