Rainwater Catchment

Rainwater Harvesting

Rainwater Collection Information Sources

City/State Websites

King County





Policy and Guidelines

On October 12, 2009, Ecology issued an Interpretive Policy Statement clarifying that a water right is not required for rooftop rainwater harvesting.

If and when the department determines that rooftop or guzzler rainwater harvesting systems are likely to negatively affect instream values or existing water rights, local restrictions may be set in place to govern subsequent new systems (there are currently no restrictions).  However, Ecology generally does not expect the collection of harvested rainwater to cause problems or reduce the amount of runoff that would have occurred from the site in its natural, pre-development state.

Additional Information Sources