City and County of Honolulu's Storm Water Management Program
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What is stormwater? Learn more about stormwater, storm drain systems and pollution.
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Big changes start with small steps!. YOU can be a solution to pollution! Sign up online and pledge to be an everyday clean water hero! Also, visit our updated ‘Keiki Corner’ for lots of fun free activities.

Free Book & Puppet Show!
'The Journey Home, Part 2'
Don’t miss the fun interactive puppet show at various locations in May! Also, displays with free copies of ‘The Journey Home, Part 2’ will be at most State & public school libraries across Oahu for limited time. Visit our  Calendar Page to see when the shows and books will be in your neighborhood!

New NPDES permit issued
The City and County of Honolulu's storm drain system is regulated under a National Pollutant Discharge Elimination System (NPDES) municipal separate storm sewer (MS4) permit. The most current permit, NPDES Permit No. HI S000002, was issued on January 16, 2015 by the Hawaii Department of Health to the City and County of Honolulu. The effective date is February 16, 2015 until midnight, January 15, 2020.

Final Storm Water Pollution Control Plan Plans (SWPCPs) Available for Public Review and Comment
The storm water permit requires the City to develop and implement site specific SWPCPs for each of its industrial facilities. Such facilities include those that are involved in vehicle or equipment maintenance, vehicle or equipment fueling, vehicle or equipment cleaning, chemical storage, recycling, closed landfills, refuse transfer stations, corporation yards, and bus  facilities, which do not have a separate NPDES permit.  The SWPCPs characterize the facility site, identify potential pollutants from the site, describe best management practices (BMPs) to prevent polluted storm water discharge from the site, present a site storm water monitoring plan, and provide means of evaluating mitigation measures.  A total of 113 SWPCPs have been prepared including Corporation Yard, Wastewater, Refuse, Transportation, Fire Department, Police Department, Park, and Enterprise Services/Golf Course facilities.  According to the City's permit, SWPCPs are to be revised and implemented within 90 calendar days of the effective date of the permit or May 17, 2015. Comments should be sent to ENV by May 1, 2015. The revised plans shall be available for public review for a period of 30 days.

State of Hawaii House Bill 1325
Introduced State of Hawaii House Bill 1325 will authorize counties to assess user fees for stormwater management.
Click here for more details.
Take the CleanWaterHonolulu Pop Quiz!

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 January 16, 2015
Final Storm Water Management Program Plan, June 22, 2012
Rules Relating to Storm Drainage Standards, effective June 1, 2013.
Best Management Practices (BMP) Manual for Construction Sites
(PDF 7.4MB)
New and Redevelopment BMP Manual Final (PDF 6.7MB)
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