A proposed open-pit rock quarry near Sumas, Washington has cleared a major procedural hurdle and is now entering its most consequential public phase: a 30-day comment period that gives Whatcom County residents a formal opportunity to weigh in on one of the more contentious land use proposals the county has seen in years. The comment period opened April 29 and closes at 4:30 p.m. on Friday, May 29, 2026.
The project, known as the Ranch Quarry Mine, was first proposed in early 2023 when Cowden, Inc., a local gravel supplier, submitted applications to Whatcom County Planning and Development Services for a conditional use permit. The proposed site sits on approximately 108 acres in the 5300 block of South Pass Road north of Sumas, a largely rural and agricultural stretch of northeastern Whatcom County near the Canadian border. The quarry footprint would cover about 64 to 70 acres, with the remainder used for access roads, buffers, and support facilities.
Under the State Environmental Policy Act (SEPA), Whatcom County is acting as the lead agency and has required that a full Environmental Impact Statement be prepared before any decision is made on the conditional use permit. The EIS process is designed to systematically analyze all foreseeable environmental consequences of a project, consider alternatives, and identify potential mitigation measures. The county is now in the scoping phase, which is the step where the public helps define what the EIS should cover.
The quarry proposal has faced sustained opposition from nearby residents since it was first announced. Those neighbors formed a nonprofit group, HOME Whatcom (Homeowners Opposed to Mine Expansion), to organize their concerns. Their primary worries center on impacts to local waterways and salmon habitat, degradation of air quality from rock crushing and heavy truck traffic, and the wear on narrow rural roads not built for industrial use. Cowden's application indicates operations would involve approximately 25 truck round-trips per day, potentially doubling during peak seasons.
Beyond traffic, opponents have raised concerns about blasting noise, dust, water table impacts, and the long-term effect on property values and the rural character of the area. The EIS scoping period is the formal mechanism for ensuring those concerns are documented and must be addressed in the full environmental analysis.
Whatcom County is accepting public comments through multiple channels. Residents can submit comments online via the dedicated Ranch Quarry EIS public comment site, by mail to the county Planning and Development Services office, or by email. A public meeting will also be held during the comment period, though the specific date and location had not been announced as of press time. The county project page at whatcomcounty.us/RanchQuarryMine has complete details on how to participate.
This is a meaningful opportunity for anyone with concerns or questions about the quarry to get them on the official record. Comments submitted during the scoping phase directly shape what the EIS must study and evaluate. They are not a vote on the project, but they carry real weight in determining the scope and depth of the county's environmental review.
The Ranch Quarry EIS process is expected to take a year or more to complete after the scoping phase closes. Once the draft EIS is published, there will be an additional public comment period before a final decision is reached on the conditional use permit. For those who want to stay informed, signing up for updates through the county project page is the most reliable way to track the timeline.
