Placer County Water Agency Share: Utility Companies Placer County Water Agency Visit Website 144 Ferguson Rd Auburn, CA 95603 (530) 823-4850 (530) 823-4960 (fax) Twitter YouTube About Map About The water agency encompasses the entire, 1,500-square-mile boundary of Placer County, ranging from the rim of the Sacramento Valley on the west to the Sierra Nevada and Lake Tahoe on the east. PCWA is What's Nearby? Distance: 5 10 15 20 25 50 mi.