The Six Basins Watermaster is a group of nine (9) local agencies. The Six Basins Watermaster is bound by a set of terms and conditions set fourth in a legal judgment effective January 1, 1999. The Six Basins Watermaster consist of the following members:

• City of La Verne
• City of Pomona
• City of Claremont
• San Antonio Water Co.
• Pomona College
• Pomona Valley Protective Association (PVPA)
• Southern California Water Co. (SCWC)
• Three Valleys Municipal Water District
• City of Upland

The Six Basins are located in the Eastern Los Angeles County and Western San Bernardino County, bounded on the south by the San Jose Hills, on the north by the San Gabriel Mountains, on the east by the Chino Basin and on the west by the Main San Gabriel Basin.

The Six Basins are comprised of the Canyon, Upper and Lower Claremont Heights, Pomona, Live Oak and Ganesha Basins. These six basins underlie the cities of Claremont, La Verne, Pomona and Northern Upland.

The Six Basins Watermaster is administrated by Three Valleys Municipal Water District through a contract with the Six Basins Watermaster Board of Directors. The Board of Directors rotate board positions on a yearly basis. For the 2004 year, the Board is comprised of the following individuals:

• Board President, Dan Keesey, City of La Verne
• Vice President, Henry Pepper, City of Pomona
• Secretary, Mark Harmon, City of Claremont
• Treasurer, Rob Turner, San Antonio Water Co.
• Other Members:
  • John Giboney, Pomona College
  • William McDonald, PVPA
  • Jim Gallagher, SCWC
  • Fred Lantz, Three Valleys Municipal Water District
  • Tom Thomas, City of Upland
    
    

The third Wednesday of January, March, May, July, September, November. Special meetings are occasionally held in August to discuss the annual budget and/or the operating safe yield.