• Notice of Triennial Review​ - Maryland's 2025 Triennial Review of Water Quality Standards. The Clean Water Act (CWA) requires that States review their water quality standards every three years (Triennial Review) and revise the standards as necessary. 
• January 2026 Assimilative Capacity Status (MAP)​ - Maryland's Tier II Interactive map includes locations of Tier II streams, watersheds and the AC status of those watersheds.
  
• January 2026 Assimilative Capacity Status (Assimilative Capacity Webpage)​ - More information about Tier II assimilative capacity status. ​
  
• Tier II Resources - All Tier II forms have been updated and new guidance is available. These new resources are available on the Tier II Homepage, under the "Other Resources" tab.
  

​Contact Information

Please direct questions or comments concerning Maryland's Antidegradation Program to Angel Valdez at [email protected].

This page was last updated  4/2026​​