Reduce flooding on your property
The Free Rainwater Assessment program was developed between the City and County of Honolulu Department of Facility Maintenance and local Honolulu nonprofit organizations.
Current program partners include Hui o Koolaupoko and Hawaii Green Growth. Please visit their websites to sign up for a free stormwater house call if you are a resident, business or school located in Windward Oahu or within the Ala Wai Watershed. Their staff will help you to identify stormwater capture opportunities and link you to resources.
The Follow the Drop app is also available for use in these areas and can be downloaded on the Apple Store or Google Play to be used for FREE! When registering as a “user”, Windward residents will need to enter account ID “808” and Ala Wai Watershed residents use account ID “HGG.” If you wish to submit your project it will be reviewed by the green infrastructure grant committee to be considered for a mini-grant (awards will be distributed in spring of 2025).
All other Oahu citizens who are interested in a rainwater assessment can sign up below. When the programs become open in your area you will be contacted.
Sign up below Do your part
Rain is a valuable resource but if there is a lot within a short period of time, it contributes to flooding and pollution, which can be detrimental to you, your property, our streams and the ocean.A rainwater assessment will show you where and how much rainwater is occurring on your property, and ultimately identify ways to help prevent flooding and pollution, and even save you money. 
Image by: City & County of Honolulu Department of Facility Maintenance (Green Infrastructure for Homeowners).
Follow the Drop
3Rwater, Hawaii Green Growth and Hui o Ko’olaupoko are currently offering FREE rainwater assessments using a new and innovative tool called the Follow the Drop (FtD) mobile app. This app can help design the best rainwater plan for your property.
