Hawaii Stormwater-Municipalities regulations & environmental compliance analysis

Hawaii Stormwater-Municipalities: What you need to know

Governing Law and Regulations

National pollutant discharge elimination system (NPDES) permit program: Hawaii Administrative Rule (HAR) 11-55-15

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General permit for discharges and certain nonstormwater discharges associated with small municipal separate storm sewer systems (MS4s): HAR 11-55 Appendix K

Regulatory Agency

Hawaii Department of Health (DOH)Clean Water Branch (CWB)

See ADDRESSES & CONTACTS for addresses and telephone numbers.

Comparison: State vs. Federal

· Rules. Hawaii is authorized by the U.S. Environmental Protection Agency (EPA) to administer the federal National Pollutant Discharge Elimination System (NPDES) permit program for wastewater discharges, including permitting authority for stormwater discharges associated with municipal separate storm sewer systems (MS4s). See the national section STORMWATER—MUNICIPALITIES for more information on the federal MS4 permitting program.

· Administration and enforcement. The DOH has primary responsibility for administering the NPDES stormwater permit program in Hawaii for MS4s. In addition to the state and federal requirements, some municipalities also have local requirements for stormwater discharges.

Note: Hawaii's NPDES General Permits expired on October 21, 2012. The DOH is currently going through the rule change process to readopt the stormwater general permits.

State Requirements


Under the NPDES stormwater program, operators of large, medium, and regulated small MS4s require authorization to discharge pollutants under a NPDES permit. "Regulated small MS4s" are defined as all small MS4s located in "urbanized areas" (UAs), as defined by the Bureau of the Census, and those small MS4s located outside of a UA that are designated by NPDES permitting ...

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