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The purpose of the Stormwater Utility is to protect the natural environment from the impacts of stormwater runoff by properly maintaining the City stormwater system and implementing the City’s stormwater management plan.  For information regarding billing, forms, etc. please see the Utilities Clerk page.



Please take the City’s stormwater survey by July 24th to help us in our stormwater education efforts. The survey is only 15 questions and should take less than 10 minutes.







2021 Stormwater Management Program Plan

Final 2020 Annual Report

Regional Stormwater Action Monitoring - 2019 Report

Stormwater Management Program Plan

2019 DOE Annual Report

2018 DOE Annual Report

2019 Update Stormwater Management Program Plan

2017 DOE Annual Report

"Regional Stormwater Monitoring"

Regional Stormwater Action Monitoring-2017 Report

Approved Final Stormwater Report

2018 Update Stormwater Management Program Plan

Draft 2014 Lake Sawyer Water Quality Report

2016 DOE Annual Report

2012 Priority Outfalls Survey

Environmental Management Plan for Street Waste

Water Quality and Yard Care information

Department of Ecology -"Stormwater Manual"

Illicit Discharge and Spills Form

Stormwater Pollution Information

Stormwater Comprehensive Plan




Please note: As of January 1, 2017 regular residential stormwater fees are collected by King County through property tax billing and are no longer collected by City of Black Diamond.

(effective January 1, 2019)

Monthly Stormwater Charge:
Residential $19.00 per ERU
All Others Based on Impervious Surface (exempting gravel)

King County, West Nile VIRUS information. Posted 11/20/17 (NEW)

Puget Sound Starts Here campaign is to educate and empower Puget Sound area residents regarding what they can do to keep pollution out of our local surface water resources, including lakes, rivers, streams and the marine waters of Puget Sound. The campaign will help residents better understnd that what flows into storm drains is generally untreated and winds up in local waterways.  See the links here for more information: Puget Sound Starts Here or YouTube. Puget Sound Starts Here Campaign- Press Release

For more information regarding stormwater and the NPDES Phase II Regulations visit the MRSC stormwater page or visit the Department of Ecology.


Never pour oil, anti-freeze, or paint down or near a storm drain or on the ground.
Always recycle used motor oil. Dispose of household hazardous water properly.
Use natural fertilizers and pest control.
Use commercial car washes connected to a sanitary sewer and conserve water by recycling rinse water.
Protect shoreline habitat.
Plant trees and native plants.
Direct rain water appropriately so it can percolate into the soil.


The City of Black Diamond, in accordance with the Department of Ecology Phase II Stormwater Permits has a 24-hour hotline for reporting discharges and spills.
24-hour Hotline: 9-1-1.
This hotline is for reporting releases or spills such as paint, fuel or oil spills, illegal dumping, muddy water, or an unknown chemical being discharged into the City’s stormwater system and/or into lakes/streams.

When reporting discharges and spills, you will need to leave (if known) the name(s) and address(es) of the owner and operator of the site, the location of the site (street address, and latitude/longitude if available); the hazardous substances released and their location (latitude/longitude if available); and your contact name and number (contact information will be kept confidential).

Thanks for doing your part to keep the City of Black Diamond clean and beautiful!


2017 - City of Black Diamond. Contact Us - Disclaimer.