Permeable resin-bound surfacing may be part of a stormwater design in Salem as the wearing course of a permeable pavement section, if City of Salem Public Works accepts it. Whether a resin-bound surface qualifies under the City's stormwater design standards is the reviewer's decision. It has to sit on a permeable, open-graded base that stores runoff and either soaks it into the ground or releases it slowly through an underdrain.

Salem's requirements trace back to its Oregon DEQ municipal stormwater permit, renewed in 2021, which sets the project sizes that must trigger post-construction controls. Runoff here feeds a dense network of creeks and ditches before reaching the Willamette River, so reducing it at the source is a big part of the City's program.

What DEQ's 2021 permit asks of Salem development

DEQ renewed Salem's Phase I municipal separate storm sewer system permit on September 15, 2021, effective October 1, 2021. The permit requires the City to keep a regulatory trigger for post-construction stormwater controls on development and redevelopment that creates or replaces 1,300 square feet or more of impervious surface for single-family residential projects, or 5,000 square feet or more for all other projects. The City may set lower local triggers, and its code and design standards control the details.

The permit also leans toward low impact development and green infrastructure, which favors facilities that infiltrate, filter or slow runoff close to where it falls. A permeable pavement section fits that approach when the base and soils support it. DEQ encourages infiltration but does not authorize discharges to underground injection systems through the MS4 permit; drywells and similar systems need their own coverage under Oregon's UIC rules in OAR 340-044.

Valley soils, creek floodplains and wet winters

Salem's stormwater drains to the Willamette River and a long list of local waters, including Mill Creek, Pringle Creek, Claggett Creek, Battle Creek, Clark Creek, Croisan Creek, Glenn Creek, Gibson Gulch, Laurel Creek, Pettijohn Creek, Shelton Ditch and the Willamette Slough. Many of those corridors have low-lying ground where winter water tables rise, and much of the valley floor has silty and clay soils that drain slowly.

That makes infiltration testing the first step. Where rates are low or groundwater is high, the engineer will typically design a permeable resin-bound section with an underdrain and controlled outlet, so it stores and filters water rather than infiltrating all of it. On West Salem and South Salem hillsides, slope stability and nearby foundations need a geotechnical check before water is sent into the ground. A resin layer over existing concrete does not do any of this: rain passes through it and runs off the slab, so it should not appear as a stormwater facility.

Where it fits in Salem

Plazas and walkways around government and institutional buildings near the Capitol and downtown.
Courtyards and paths in downtown and riverfront mixed-use redevelopment.
Customer parking and entries at commercial sites along corridors such as Lancaster Drive.
Patios and driveways at homes, where projects that create or replace 1,300 square feet or more of impervious area may face post-construction rules.

Getting a permeable resin-bound section approved in Salem

Ask City of Salem Public Works early which local trigger and design standards apply to your project, then show the permeable area in the stormwater report with infiltration test results, base depth, underdrain and overflow, and an operation and maintenance plan. If any part of the design sends water into a drywell or other subsurface system, confirm UIC requirements with DEQ as well.

Resin Rock is a manufacturer-supplier and does not install. We supply UV-stable binder, natural stone aggregate blends, trims and the Rock Crete permeable sub-base, with technical data sheets for your engineer. Owners can request an approved installer, usually matched within 24 hours, and contractors can apply for our Oregon installer training.

Before you specify permeable resin-bound in Salem

Ask Salem Public Works for the current local trigger and stormwater design standards.
Total new and replaced impervious area against the 1,300 or 5,000 square foot permit triggers.
Test infiltration and check winter groundwater, especially near creek corridors.
Get a geotechnical review on West Salem and South Salem hillside lots.
Confirm DEQ UIC coverage if any drywell or subsurface injection is involved.
Prepare an operation and maintenance plan for the permeable area.

Common questions about permeable resin-bound in Salem

Does my house project in Salem need stormwater controls?

It may. DEQ's 2021 permit requires Salem to trigger post-construction stormwater controls for single-family projects that create or replace 1,300 square feet or more of impervious surface, and 5,000 square feet for other projects. The City can apply stricter local rules, so confirm with Salem Public Works before finalizing plans.

Can I send water from a permeable driveway into a drywell?

Only with the right approvals. Salem's MS4 permit does not authorize discharges to underground injection control systems, so drywells and similar systems need separate coverage under Oregon's UIC rules. A permeable section that soaks into native soil through its base, or drains through an underdrain to an approved outlet, avoids that question.

Will resin-bound over my old concrete patio reduce runoff?

No. The resin layer lets water through, but the slab underneath sheds it just as before, so there is no reduction in runoff and nothing to credit. To make a difference, the concrete is removed and the surface is built over a permeable base such as Rock Crete over an engineered stone reservoir.

Official sources for Salem

Local rules change. We last checked these sources in October 2026. Confirm current requirements with the reviewing agency before you design, and treat this page as a starting point, not engineering or permitting advice.

Permeable Resin-Bound Surfacing in Salem, OR