Q: What is the Lenora Regional Stormwater Treatment Facility, and when does construction start?
A: It is a $8.73 million regional stormwater treatment facility being built in April 2026 on city-owned property at the corner of Lenora Street and S 1st Avenue in Lowell, adjacent to Lowell Riverfront Park. Funded primarily by a Washington State Department of Ecology Water Quality grant, it will treat runoff from 146 acres of Lowell drainage before it discharges into the Marshland Canal and the Snohomish River — removing total suspended solids, dissolved copper and zinc, oil and total phosphorus.
While most of Everett’s construction conversation in April 2026 has been about a $120 million stadium and 300 new waterfront apartments, an $8.73 million project starts this month on a half-acre lot in Lowell that will quietly do more for the Snohomish River than any other capital project the city is funding right now.
The Lenora Regional Stormwater Treatment Facility breaks ground in April 2026. It is one of the projects nobody will livestream and nobody will design-render, and it is exactly the kind of work that determines whether Everett’s waterfront stays swimmable, fishable, and credible as a sustainability story over the next decade.
Where it is and what it does
The site is small — 11,944 square feet, 0.27 acres — at the northeast corner of the S 1st Avenue and Lenora Street intersection, immediately adjacent to Lowell Riverfront Park, on the west side of the BNSF railroad tracks. If you have ever parked at the Lowell Riverfront Trail to walk the dog, you have driven past it without noticing.
The facility’s job is to take stormwater runoff from three drainage subbasins in Lowell — known to city staff as LW-9, LW-10 and LW-11, totaling 146.10 acres — and run it through a treatment train before it ever reaches the Marshland Canal system, which discharges into the Snohomish River.
The first phase of the facility is a five-cell Filterra Bioscape system with two of the five cells fully functional at opening. That gives the city a phased path to scale up treatment capacity as the surrounding subbasins develop further.
What gets removed from the runoff
The contaminants the Lenora facility is designed to capture are the standard menu of urban stormwater pollutants:
- Total suspended solids (TSS) — particulate matter that clouds water and smothers spawning gravel.
- Total petroleum hydrocarbons — oil and fuel runoff from streets, driveways, and parking lots.
- Dissolved copper — primarily from vehicle brake pads. Copper is acutely toxic to juvenile salmon at very low concentrations.
- Dissolved zinc — from tire wear, galvanized metal, and roofing.
- Total phosphorus — the driver of summer algae blooms downstream.
The Marshland Canal eventually discharges to the Snohomish River, which means everything the facility removes is something that does not enter the river — and does not enter Possession Sound or any of the salmon habitat between Lowell and the river mouth.
The funding story
The project is funded primarily by the Washington State Department of Ecology under Water Quality Combined Financial Assistance Agreement WQC-2025-EverPW-00177, in the amount of $8,733,920. That is roughly the entire project cost, which is why the City of Everett can deliver an $8.7M facility without putting it on the local utility bill.
For Everett residents already absorbing the proposed $10.74-per-month utility tax hike going through council right now, the Lenora project is the rare piece of stormwater infrastructure that does not show up on your bill at all. The state Ecology grant covers it.
Why Lowell needed this
Lowell is one of Everett’s most environmentally complex neighborhoods. It sits on a low riverfront bench between the Snohomish River and the BNSF tracks, with three small subbasins draining toward the Marshland Canal. The geography means stormwater from streets, parking lots, and roofs throughout the neighborhood concentrates fast and hits the river hard during rain events.
The 146 acres covered by the Lenora facility include a mix of residential, commercial, and rail-adjacent uses. That mix is exactly the kind of urban runoff cocktail that does the most damage to salmon habitat, because dissolved copper from brake pads and dissolved zinc from tire wear behave like concentrated toxins for juvenile fish even at very low concentrations. Removing those before they reach the river is the difference between a healthy salmon return and a steady decline.
What it means for the Lowell Riverfront Trail
The construction site is immediately adjacent to Lowell Riverfront Park, which means anyone using the Lowell Riverfront Trail this spring and summer should expect periodic construction activity, equipment staging, and possible short trail detours along the affected segment near S 1st Avenue and Lenora Street. The city’s Public Works department will post detour signage if any trail closures become necessary.
The good news for trail users: the facility is going on a small footprint at the edge of the park, not inside it. The trail itself stays intact. Once the facility opens, the only visible change at the site will be the Filterra system’s surface elements — bioretention cells, a small access path, and a city interpretive sign that the Public Works department typically installs at completed water quality projects.
How this fits Everett’s bigger stormwater picture
Everett operates under a state-issued NPDES Phase II Municipal Stormwater Permit. Among other things, that permit requires the city to identify high-priority drainage areas and progressively install treatment infrastructure that meets state water quality standards. The Stormwater Management Action Plan (SMAP) the city has been refining for several years identifies the Lowell subbasins as priorities precisely because they discharge directly to a salmon-bearing waterway with limited dilution.
The Lenora facility is one of the more visible deliverables of that plan. It is also a piece of evidence that the regulatory machinery — state grant funding, federal water quality standards, city capital planning — can still produce concrete infrastructure on the ground in 2026, even when the larger civic conversation is about $14 million budget gaps and $120 million stadiums.
The construction window
The city has scheduled construction to begin in April 2026. Work on the facility itself is small enough that the duration is measured in months, not years. Public Works has not published a precise opening date for the first two functional cells of the Filterra system, but the project’s small footprint and the simple construction sequence point toward a late-2026 functional opening, with the remaining three cells brought online as the surrounding subbasins develop.
Why we wrote about this one
Most of Everett’s construction tracker right now reads like a developer brochure — apartments, restaurants, a stadium, a movie theater. That coverage is real and important. But the Lenora facility is a useful counterweight: a small, technical, state-funded piece of infrastructure that does not generate Instagram content but quietly determines whether the river the rest of the waterfront story sits next to actually stays healthy.
Lowell residents in particular should know it is happening. The half-acre lot at S 1st and Lenora is going to look like a construction site for the next several months, and the trail-adjacent staging will be visible from the river. The reason for the disruption is also the reason it is worth it.
Frequently Asked Questions
Where is the Lenora Regional Stormwater Treatment Facility being built?
On a 0.27-acre, 11,944-square-foot city-owned lot at the northeast corner of S 1st Avenue and Lenora Street in Lowell, immediately west of the BNSF railroad tracks and adjacent to Lowell Riverfront Park.
When does construction start?
April 2026.
How much does the project cost?
$8,733,920, funded primarily by a Washington State Department of Ecology Water Quality Combined Financial Assistance Agreement (WQC-2025-EverPW-00177).
What does the facility actually do?
It treats stormwater runoff from 146.10 acres of Lowell drainage (subbasins LW-9, LW-10, LW-11) before that runoff discharges into the Marshland Canal and the Snohomish River. It removes total suspended solids, oil and total petroleum hydrocarbons, dissolved copper, dissolved zinc and total phosphorus.
Who pays for it?
Almost the entire project cost is covered by a Washington State Department of Ecology grant. Everett ratepayers do not see the project on their utility bill.
What kind of treatment system is it?
A five-cell Filterra Bioscape system, with two cells fully functional at opening and three more available for buildout as the surrounding subbasins develop.
Will the Lowell Riverfront Trail be affected?
The project site is adjacent to the trail. Trail users should expect occasional construction activity and possible short trail detours during the construction window. Permanent trail alignment will not change.
Why does this matter for the Snohomish River?
Dissolved copper and zinc from urban runoff are toxic to juvenile salmon at very low concentrations. Removing those pollutants before they hit the river is one of the highest-impact things a city can do for downstream salmon habitat.
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