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Central Valley staff say Delta methylmercury TMDL will need rethinking; current targets likely unattainable with present tools
Summary
Central Valley Regional Water Board staff cautioned that the 2010 Delta methylmercury TMDL’s long‑term tissue‑based targets cannot be met with currently available controls or reasonable expenditure, and flagged major equity and technical challenges for reformulation and stakeholder communication.
Central Valley Regional Water Board staff told the statewide water committee that the 2010 Delta methylmercury total maximum daily load (TMDL) and its one‑meal‑per‑week fish tissue goals pose serious technical and policy challenges and likely cannot be met with current tools or costs the region could reasonably bear.
Staff summarized the history: the methylmercury TMDL carved the Delta into nine subareas, set fish‑tissue targets for trophic‑level 3–4 predators and back‑calculated aqueous methylmercury goals and load allocations. Implementation was phased and relied on past technical work…
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