Drainage

If you’re planning a construction project in the Lake Whatcom Watershed area, understanding and following the area’s strict site preparation rules is essential. Lake Whatcom provides drinking water for over 100,000 people in Whatcom County, making it one of the most environmentally sensitive regions in the state. Because of this, local and state agencies enforce special regulations to protect water quality during and after construction.

Permitting requirements
Before any site work begins, you’ll likely need a Land Disturbance Permit (item 16.80.120) through the City of Bellingham or Whatcom County, depending on the location. Projects that involve clearing, grading or excavation in the watershed almost always require permits. Additional approvals may be needed for driveways, stormwater systems or shoreline buffers.

Erosion and sediment control

To prevent soil from washing into the lake during rain events, all projects must follow the same plan, like limiting equipment access to one entry and exit point to reduce tracking out of soil. This typically includes measures like silt fencing, straw wattles, mulch cover and hydroseeding. Timing is also important—construction is limited from October 1 through May 31 to reduce erosion risk.

Not sure if you live in the Lake Whatcom watershed? Use this map to help you find out.

Tree removal and vegetation limits
The watershed has limits on how much vegetation can be cleared, especially within buffer zones near streams or wetlands. In some areas, you may be required to retain a certain percentage of tree canopy or replant disturbed areas to meet watershed protection standards.

Inspections and penalties

Expect multiple inspections throughout your excavation, site prep and construction project. Agencies take enforcement seriously and failing to comply with watershed regulations can result in stop-work orders, fines and required remediation.

A Temporary Erosion and Sedimentation Control plan must be submitted at the time of Natural Resource Assessment submittal or building permit submittal (whichever comes first). Appropriate TESC measures must be installed before any clearing activity. A TESC inspection must occur before the first building permit inspection. Excavation professionals like Ritter Dirt and Asphalt can work through this process with you.

Hire a contractor who knows the rules
Site prep in the Lake Whatcom Watershed isn’t just about moving dirt—it’s about protecting one of the region’s most vital resources. Working with an experienced excavation contractor who understands the watershed’s unique regulations is critical to avoiding costly delays and ensuring your project is built responsibly.

If you’re looking for a licensed site prep contractor to help with a Lake Whatcom Watershed construction project, contact Ritter Dirt and Asphalt. Our experienced team knows how to navigate local permitting, implement erosion control and get your project started the right way.