Stormwater System Information

The City of Duvall, through its NPDES Municipal Permit, is responsible for ensuring proper maintenance and operation of all public and private stormwater systems within the City. This includes 30 miles of pipes, 2,807 public and private catch basins, 125 known municipally owned or operated stormwater treatment and flow control BMPs/facilities.

The Stormwater Utility:

  • Ensures that public and private stormwater systems are planned, developed, and maintained to prevent flooding, protect water quality, and preserve natural stormwater systems.
  • Monitors water quality and provides leadership and focus for community efforts working toward improved stormwater management.
  • Identifies needs for capital improvement of the stormwater systems including streams and habitat, prioritizes, selects, and constructs those improvements.
  • Ensures that City construction and maintenance projects are planned and implemented to cause as little short term and long term harm as possible to the environment.
Storm Drain

The City is Addressing Stormwater Management in 3 Phases:





Construction projects typically require a Construction Stormwater General Permit

2009 flood aerial