City and County of Honolulu's Storm Water Management Program
Education and Outreach
Find out what you can do to keep our waters clean.
Construction Site Runoff
Learn more about good construction practices.
Learn more about this program and what continues to be inspected even after construction.
Find out what the City is doing to keep Honoluluís waters clean.
Discover what is considered an illegal connection and how the City is trying to eliminate illicit discharges from these connections.
Learn about the Cityís program focused on reducing discharge of pollutants from these types of facilities.
Find out which areas, facilities, and activities the City is monitoring.
What is stormwater?
Learn more about stormwater, storm drain systems and pollution.
Learn how you can be an
Everyday Clean Water Hero!
Take the World Water Monitoring Challenge training quiz.
Click here for more details.
Try our new
Everyday Clean Water Hero pop quiz
to see how much you know about storm water!
Frequently Read Documents
NPDES Permit No. HI S000002 issued on May 24, 2011 (PDF 4.0MB)
Final Storm Water Management Program Plan
Rules Relating to Storm Drainage Standards, effective June 1, 2013.
Best Management Practices (BMP) Manual for Construction Sites (PDF 7.4MB)
Check out the fun and success of past events
See upcoming events in your area you can participate in