Businesses have a unique presence in our community. They also have special concerns and responsibilities when it comes to keeping our water clean. It is important for businesses to ensure that the activities occurring at their sites do not cause stormwater pollution. 

  • Keep dumpster lids closed – Keeping dumpster lids closed and in proper working condition minimizes storm water’s ability to impact the trash inside.
  • Sweep up litter – Regular sweeping of any impervious surface, especially around storm drains, may prevent stormwater pollution. Never use water to hose down driveways, sidewalks, etc. because it will transport any pollutants along its path into the nearest storm drain.
  • Clean up grass clippings and yard trimmings – Grass clippings and other green yard waste can cause algal blooms when they are carried into the ocean by stormwater. 
  • Use pesticides, herbicides, and fertilizers only as needed – This will save you money and help reduce the chances of rain washing these chemicals down the storm drain. Use spot spray rather than broadcasting or using a spray truck, where feasible. Never apply pesticides, herbicides, or fertilizers before a forecasted rain event and avoid spraying during high winds.
  • Properly store hazardous materials – Clearly label and securely store hazardous materials. Cover products and stockpiled materials from the rain or store indoors.
  • Use drip pans under parked vehicles and equipment – Place used oil receptacles under cover to avoid exposure to rain and provide secondary containment to capture any leaks.
  • Minimize used oil exposure – Place used oil receptacles under cover to avoid exposure to rain and provide secondary containment to capture any leaks.
  • Quickly and properly respond to spills – Obtain a spill kit and educate employees on proper spill response procedures. Dispose of used absorption materials properly.
  • Pour wash water in a sink – Pour wash water into a janitorial sink, which connects to the sanitary sewer, instead of onto the parking lot or street.
  • Contain vehicle wash water – Contain vehicle wash water onsite and away from storm drains.
  • Reduce impervious surfaces – Impervious surfaces such as concrete driveways, parking lots, and roads do not allow stormwater to infiltrate into the ground; instead, they allow rain to flow into gutters that lead to the nearest storm drain. To prevent stormwater runoff from your property, replace paved surfaces with a porous alternative or install a vegetated buffer, which captures and filters pollutants. Additionally, you may use a rain barrel or a cistern to capture and prevent stormwater from flowing onto an impervious surface.
  • Maintain oil/water separators – Maintain and service oil/water separators and grease traps frequently.

Want more information? Download our Best Management Practices for Businesses flyer.

Doing any landscaping? Download our Landscaper’s Guide to Best Management Practices.

For owners of industrial and commercial facilities adjacent to Maui Highway’s Municipal Separate Storm Sewer System (MS4) that have been selected for stormwater evaluations, please click the link below to complete the Industrial & Commercial Stormwater Evaluation Program Facility Survey. 

Complete Survey Here

If you have a connection into the state’s MS4 and were directed to obtain a permit, please complete the fillable form below and email to

Permit for Connection to the State Highways Drainage System

Please visit our Education Page for all of our online stormwater educational activities and a special giveaway!Education Page
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