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State ADU rules require denser housing but Rainier’s septic limits could curb implementation
Summary
Consultant explained that new state rules require cities to allow at least two ADUs per single-family lot and permit 'coliving' arrangements, but Rainier’s septic capacity and a county change raising minimum parcel septic requirements to one acre will constrain how many ADUs are practically buildable.
The state’s recent housing laws require municipalities to permit at least two accessory dwelling units (ADUs) on properties with a primary residence and to allow a range of alternative housing forms, including so-called 'coliving'. Consultant Larry Levine told the commission: “You must allow at least 2 ADUs on every property with a primary house, and you can no longer require that that ADU is small.”
Levine and staff warned that local utility and septic constraints will limit how these rules play out in Rainier. Commissioners noted that many lots in town rely on septic systems and that county rules adopted April 1 increase minimum parcel requirements for septic in some areas from 0.5 acres to 1 acre, making multiple ADUs infeasible on smaller lots unless sewer or other utility upgrades occur.
