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State board approves Newport Bay copper TMDLs with phased reductions and adaptive review
Summary
The State Water Resources Control Board on Aug. 5 approved copper TMDLs for Upper and Lower Newport Bay, setting phased waste load allocations for vessels and a 12‑year compliance schedule while encouraging continued stakeholder collaboration and adaptive management.
The State Water Resources Control Board voted Aug. 5 to approve the Santa Ana Regional Water Quality Control Board’s total maximum daily load (TMDL) for dissolved copper in Upper and Lower Newport Bay.
The adopted basin plan amendment responds to a longstanding listing for copper under the Clean Water Act and ties numeric targets to the California Toxics Rule (CTR) chronic and acute criteria for dissolved copper; staff also adopted sediment guidance using NOAA’s effects‑range approaches and a biologically based alternative where appropriate. Santa Ana staff said monitoring and studies…
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