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Regulatory Compliance and Land Acquisition Services
King Street Center, KSC-NR-6200
201 South Jackson Street
Seattle, WA 98104-3854
March 20, 2026
TO: Jill Ding
FM: Jordyn Marxen
RE: South Plant Loop Biosolids Composting Project
King County Wastewater Treatment Division (WTD) has an ongoing pilot program at the
South Treatment Plant (1200 Monster Rd SW) for our Loop Biosolid Composting project.
The City of Renton issued a temporary use permit (LUA21- 000141) in May 2021. Due to
unforeseen delays including budgeting, additional permitting, and contractor
obtainment, the construction of the site was not completed until November 2024 at
which point composting began.
WTD is applying for another temporary use permit to allow the pilot program to continue
operation until sufficient data can be collected as proof of concept for a future
permanent program. As only 18 months of pilot testing will have been accomplished by
the time the 2021 permit expires, WTD is requesting this new temporary use permit be
approved and issued no later than May 25, 2026, and be approved for a minimum of 5
years. This would ensure there is no lapse in our permit use for ongoing testing and that
sufficient data can be collected for proof of concept.
If you have any questions, please call me at 206-263-1669, or email me at
jmarxen@kingcounty.gov.