Stormwater fee credits · Washington
King County Surface Water Management Fee Discount
Run by King County Water and Land Resources Division
- What you get
- Discount equal to 50 percent of the current residential SWM fee (dollar fee not on this page)
- Who qualifies
- Residential owners whose parcels use county-approved facilities/BMPs; separate 65-10 discount for parcels at least 65 percent forested or native.
- Where
- Residential parcel owners in unincorporated King County who pay the surface water management fee.
- Status
- Open. No deadlines stated.
- Type of payment
- Fee credit
What you do
Manage runoff on your parcel with King County-approved flow control or water quality facilities or BMPs, or keep the parcel largely forested, to get half off the annual surface water management fee.
Requirements
- Facility discount: facilities or BMPs listed in the King County Surface Water Design Manual
- 65-10 discount: at least 65% forested or native, no more than 20% effective impervious area, no more than 10% effective impervious area draining directly without flow control BMPs, flow control BMPs for impervious area over 10%
- King County verifies conditions; at least one engineer site visit for 65-10
- 65-10 cannot be combined with other runoff mitigation discounts
How to apply
- 1Call Stormwater Services at 206-477-4811 ([email protected]) to find out if your parcel qualifies
- 2County verifies the facility or parcel conditions
- 3Discount applied to the SWM fee
Timing and deadlines
not published
Sources
- https://kingcounty.gov/depts/dnrp/wlr/surface-water-mgt-fee/discount.aspx (official page)
- https://kingcounty.gov/en/dept/dnrp/nature-recreation/environment-ecology-conservation/stormwater-surface-water-management/surface-water-management-fee/discounts/other-discounts
Last checked October 17, 2026. See something out of date? Tell us.
Sow is not affiliated with any of these agencies or utilities. Amounts and rules change, often at the start of a fiscal year, so confirm the details on the official page before you start a project. How we research these programs
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