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Staff outlines denitrification, tertiary‑treatment options; initial cost estimates range from $60M to higher for full program
Summary
City staff described regulatory drivers and preliminary cost estimates for denitrification at Porterville's wastewater treatment plant and the broader tertiary/recycled‑water program, noting a three‑year exemption and the need to seek grants and low‑interest loans for implementation.
Porterville staff briefed the council on options to meet state discharge requirements for nitrates and on a broader recycled‑water/tertiary treatment plan that could protect potable supplies and create irrigation water for parks and other uses.
Assistant City Manager Michael Knight told the council that the immediate denitrification component under study would be a membrane bioreactor (MBR) implementation and that, "the $60,000,000 is essentially just an implementation of an M B R filter that will remove nitrates out of our wastewater discharge." Knight said the denitrification step is one element of a larger tertiary plan that staff have estimated at roughly $160,000,000 in earlier…
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