City of Monroe Stormwater System Information

Stormwater runoff happens when rain or snow melt flows off impervious surfaces such as roofs, driveways, sidewalks and streets which prevent the water from naturally soaking into the ground. Stormwater flowing across hard surfaces may pick up pollutants along the way such as oil, fertilizer, chemicals, dirt, litter and other debris. When run off becomes polluted, it can harm the environment by flowing into Monroe's collection system and then into streams, lakes, wetlands and eventually the Skykomish River.


The Department of Ecology’s 2012 Stormwater Management Manual for Western Washington as amended in 2014 (SMMWW) has been adopted by reference by the Monroe City Council. The City is required by Federal Law to maintain an operating permit, which is generally referred to as the National Pollutant Discharge Elimination System (NPDES) Permit. The SMMWW and the NPDES provide the required foundation for most of the City's stormwater management program activities.

The NPDES requires the City to post certain documents so that the public may review them. Below, you will find links to the City's annual stormwater system report, the stormwater management plan and the quality assurance project plan.

NPDES Document Links

Stormwater Management Program Plan

Stormwater Annual-Report

Quality Assurance Project Plan

If you have questions regarding the City of Monroe's Stormwater Management Program, please contact the City Stormwater Compliance Coordinator at 360-863-4552.

Stormwater Hotline Information

Please report clogged storm drains, accidental spills or anyone illegally discharging waste into the City of Monroe’s stormwater system by calling the Stormwater Hotline at 360-863-4552. Report illegal dumping or spills that are potentially life threatening or hazardous to the environment by calling 9-1-1. Make the call!