The Maryland Department of the Environment has reviewed W.R. Grace & Co.’s request to make changes at its chemical facility located at 5500 Chemical Road in Curtis Bay and all public comments received. MDE has made a final determination to issue the permit-to construct, effective October 23, 2026.
The public may file for a petition for judicial review of MDE’s Final Determination. Any petition for judicial review must be filed pursuant to Section 1-605 of the Environment Article, Annotated Code of Maryland. The petition shall be filed by November 30, 2026 in the circuit court for Baltimore City as specified in the Final Determination Notice.
Application Documents
Air Quality Permit Application Submitted by Grace (Public Version)
WR Grace Informational Meeting Presentation
Permit Application Addendum Received March 31, 2026
Public Hearing Documents
Hearing Recording
Hearing Slides
Notice of Tentative Determination, Public Hearing, and Opportunity to Submit Written Comments
Fact Sheet and Tentative Determination
Draft Air Quality Permit to Construct
List of Technical References
Privilege Log
Final Determination Documents
Notice of Final Determination
Final Determination and Response to Comments
Public Comments Received
Issued Permit to Construct
