STormwater Outreach for Regional Municipalities, known as STORM, is a regional organization promoting stormwater quality education within the greater Phoenix metropolitan area. STORM was founded in 2002, in response to federal regulations requiring certain municipalities to implement measures to educate the public on ways to protect the quality of stormwater runoff.

In December 2005, STORM filed for not-for-profit status with the Arizona Corporation Commission. The trade names "STormwater Outreach for Regional Municipalities (STORM)" and "STORM" were filed with the Secretary of State. STORM officially became a not-for-profit charitable organization in February 2006 and developed a set of bylaws to guide the organization. This status allows STORM to operate as a charitable organization and enables tax deductible contributions to promote stormwater pollution prevention.