Lewiston council hears plan to allow upgraded septic systems in water-source "Zone 2"

Dec 16, 2025

Council members reviewed a proposal to permit upgrades to existing septic systems in Zone 2 source-protection areas, favoring improved treatment for existing systems (not new hookups), with quarterly testing and a 2.5 mg/L nitrate benchmark under discussion.

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Marcus (first name only), speaking during the council meeting, summarized the outcome of a multi-agency meeting about protecting Lewiston’s wellheads and water sources and described a proposed shift in approach on septic systems in source-protection "Zone 2." He said state and county representatives are now leaning toward allowing upgrades to existing septic systems in Zone 2 rather than permitting new systems there.

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