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Commission approves tier and zoning changes to limit septic density in Summit and Newcastle areas
Summary
After a multi-year septic-density study, the Iron County Commission amended its general plan and rezoned parcels around Summit and Newcastle to reduce septic density and protect groundwater, approving tier reductions and zone changes following a public hearing and planning‑staff presentation.
The Iron County Commission on Monday approved changes to the county general plan and corresponding zone map for parcels in and around the Summit and Newcastle urbanizing areas, moves county planners say are intended to reduce septic-system density and protect groundwater.
Planning director Reid presented the changes, saying they stem from a 2023 septic-density analysis and Utah Geological Survey guidance. The study established baseline nitrate levels and used a 3.5 milligrams-per-liter threshold to model how many septic…
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