On-going maintenance is essential to keep your RainWise installation working properly.

Seattle Public Utilities and King County are counting on your RainWise project to prevent polluted stormwater from going into our waterways. Your cistern and/or rain garden is made possible with public funds. In return, RainWise requires homeowners to maintain their RainWise project for five years.

Understand Your RainWise Commitment


RainWise customers and cistern

Cistern Maintenance

Watch Cistern care video in (English, Spanish, Vietnamese).

Read Cistern maintenance guide in (English, Spanish, Vietnamese).

For more information visit the Cistern maintenance page.



Rain Garden Maintenance

Watch instruction on weeding and mulching your rain garden (English, Spanish, Vietnamese).

Watch instruction on watering your rain garden (English, Spanish, Vietnamese).

Read a printable maintenance guide (English, Spanish, Vietnamese).

For more details on maintaining rain gardens.