Small Municipal Separate Storm Sewer System (MS-4)

Small Municipal Separate Storm Sewer Systems


In our commitment to protect our precious waters, we would like to remind our ʻohana that all storm drains flow to the ocean. Please click on the links below to read the brochures and see how you can help keep our water safe.


Campus Water Pollution Prevention Program and School Newsletter

Small Municipal Separate Storm Sewer System (MS4) Program

About the City & County of Honolulu Storm Drain System

Protecting Our Water Quality from Urban Runoff

Car Washing

Home & Garden Pollution Prevention

Auto Maintenance Storm Water Pollution Prevention