Construction & Codes

Snohomish County’s robust growth—particularly in Mukilteo, Mill Creek, Bothell, Marysville, and Lake Stevens—continues driving new residential construction. Understanding current plumbing code requirements ensures compliant, efficient, and problem-free systems for modern homes. 2025 Code Foundation Washington State Plumbing Code Snohomish County adopts the Washington State Plumbing Code (based on Uniform Plumbing Code) with local amendments. The…