Commission signals support for narrower rural SEPA exemption, asks staff for options

Thurston County staff proposed raising categorical SEPA exemption thresholds to speed infill and housing development, and planning commissioners on May 21 signaled support for a moderated approach that targets growth inside urban growth areas and retains tighter limits for most rural lands.

Anna Rodriguez and other county planners described proposed changes to SEPA categorical exemptions (state law updates passed in 2023 were cited). Staff noted current county exemption levels have not been substantially updated since the 1990s and said increasing exemptions in urban growth areas (UGAs) would better align county practice with neighboring jurisdictions and state infill policy. Staff discussed draft figures in which urban exemptions could be increased substantially (examples discussed in the meeting included raising UGA thresholds to the 20–30 dwelling‑unit range and raising multifamily thresholds); outside UGAs staff said draft language would raise single‑family exemptions from the current level of four units to a larger threshold (staff discussed a 20‑unit figure as one possible option).

Commissioners expressed differing views. Several commissioners said higher exemptions should be focused in UGAs where services exist and where new housing is intended; others worried that raising thresholds for unincorporated rural areas could generate sprawl and environmental impacts. Commissioner Kevin Pesterger and others emphasized the need for services (sewer, water, transportation) and suggested clustered development as a mechanism to reduce rural footprint.

After discussion commissioners conducted a straw poll on a compromise: lower the proposed rural threshold to a modest number (several commissioners favored 8 units) while allowing a separate carve‑out for clustered housing that could permit larger projects (a clustered carve‑out of up to 20 units was discussed). The chair summarized the result as a majority temperature check in favor of an “8 with a clustered up to 20” compromise and asked staff to return with specific draft code options at the June 4 meeting.

Staff cautioned that the exemption changes do not remove other development standards: projects would still be required to meet underlying zoning, critical areas regulations, stormwater and septic rules, public‑notice requirements created by state law for the infill exemptions, and other permitting requirements. Staff also noted certain categories remain ineligible for exemptions per state law (for example, projects requiring air or water discharge permits or those that include whole or partial land‑clearing in certain sensitive habitats).

Next steps: staff will prepare draft code language and options that reflect the commission’s direction and present them for further consideration on June 4. No final code changes were adopted at the May 21 meeting.