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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In April, join the City to celebrate Earth Month! Scheduled activities and events focus on the mauka to makai connection. Participants will learn about water quality and best management practices that can reduce pollution to our waterways.

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.

The storm water permit requires the City to meet stream waste load allocations and reduction goals. The draft of the I&M Plans for the Ala Wai Canal, Kapaa Stream, Kaneohe Stream, Kawa Stream, North Fork Kaukonahua Stream and Waimanalo Stream are available for public review. The I&M Plans present the basis for the established reduction goals and the Best Management Practices (BMPs) to be implemented by the City to reduce pollutant loads to the various watersheds. The finalized plans are scheduled to be submitted to the State Department of Health on June 30, 2015. Comments should be sent to ENV by May 1, 2015. The draft plans shall be available for public review for a period of 30 days

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.
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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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