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Mayfield planning commission backs council DADU changes, cites state septic standards
Summary
The commission recommended approval of the council's detached-ADU (DADU) code amendments and agreed to reference Utah Administrative Code R317-4-13 for septic design; the commission set a public hearing next Wednesday at 7 p.m.
The Mayfield Town Planning Commission voted on March 31 to recommend that the town council adopt the proposed detached accessory-dwelling (DADU) code amendments, including explicit reference to state septic-design standards.
Staff and commissioners said the council chose to split internal ADU (IADU) and detached ADU language so internal units could proceed while the detached rules were refined. Staff told the commission the council’s redline calls for adopting the health-code standards for septic systems, and cited the state administrative code provision (R317-4-13) that governs septic-tank design and leach-field criteria.
Commissioners discussed technical constraints that will shape where detached units are permitted in Mayfield. Staff cited Mayfield soil types as predominantly class 4–5, which require larger leach fields, and said the council is proposing a 30,000-square-foot minimum lot size in many areas to meet those septic requirements. As staff put it, “the council, they wanna see the minimum lot size for a DADU is 30,000 square feet.”
The commission reviewed specific standards proposed in the red-line code: a DADU minimum size cited at 500 square feet, a maximum of 1,000 square feet in some drafts, and a height limit that “shall not exceed the height of the primary dwelling or 25 foot.” Commissioners also discussed setbacks (12 feet from a main house, 75 feet from the street when no primary dwelling exists), utility connections, and that the county will not issue a certificate of occupancy until required conditions (for example, combining lots or recorded agreements) are met.
Commission member (speaker 4) moved to recommend the council’s red-line changes and specifically add the Utah Administrative Code R317-4-13 reference for septic design; the motion was seconded and adopted by voice vote. Staff announced a public hearing on the detached-ADU and code amendments scheduled for next Wednesday at 7 p.m.
The recommendation now goes to the town council for final consideration and ordinance adoption.
