2 ASR wells operated by Walla Walla are capable of injecting 400-500 million gallons of water per year into the Columbia Basalts. The City would like to use these wells to supplement peak demand and emergency storage; however, recover of water has not yet been approved (as of 2012).

Highlights:

• In 1999, the city converted a deep well into an ASR well. In 2003, a second well was converted to an injection/recovery well.

• From 2000-2003 a total of 13,846 million gallons of surface water was captured for ASR injection

• 1^st ASR well: Drilled in 1941. Depth 810 feet, 15-inch casing to 138 feet. Upgraded to ASR in 1999.

•  2^nd ASR well: Drilled in 1961. Depth 1,330 feet, 24-inch casing to 285 feet. Upgraded to ASR in 2003.

Aquifer levels have risen 20-30 feet per year in injected area. An average of 286 million gallons injected every year, expecting up to 500 million gallons (as of 2006)