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State wastewater advisory group refines ‘inadequacy’ and risk metrics for collection systems and treatment plants
Summary
Advisory group members and state staff updated criteria to flag wastewater collection systems and facilities as ‘inadequate’ or “at risk,” emphasizing separate calculations for collection systems (SSSGo), NPDES plants and WDR facilities and proposing multiple review steps before public lists are published.
State Water Board staff and advisory-group members presented updated methods on how the state will flag wastewater systems and treatment facilities as “inadequate” and assess risk, laying out separate formulas for collection systems regulated under the sanitary sewer system general order (SSS Go), NPDES-permitted plants and facilities subject to Waste Discharge Requirements (WDR).
The state team said the approach will treat inadequacy and risk as distinct analyses and calculate separate scores for each facility type, then share initial lists with regional boards, the Water Board executive team and the advisory group before any public release.
The updated collection-system (SSS Go) criteria would flag a system as inadequate if it met two or more conditions from categories that include high rates of sanitary sewer overflows (SSOs), spill…
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