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State Water Board approves Santa Ana Region's copper TMDLs for Upper and Lower Newport Bay; phased boat‑focused reductions and adaptive review included
Summary
The board approved the Santa Ana Regional Water Quality Control Board's Total Maximum Daily Loads for dissolved and sediment copper in Upper and Lower Newport Bay, authorizing phased reductions focused on recreational and small commercial vessels and a twelve‑year compliance schedule with periodic reviews.
The State Water Resources Control Board on Aug. 5 approved copper TMDLs for Upper and Lower Newport Bay developed by the Santa Ana Regional Water Quality Control Board. The action responds to dissolved copper exceedances of the federal California Toxics Rule (CTR) criteria and sediment concentrations above NOAA guidance in some locations; staff identified vessel antifouling paints as the largest remaining source and proposed phased reductions that focus on recreational and small commercial boats.
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