The Valley Water Collaborative provides free well testing and access to safe drinking water for residents in Yolo, Eastern San Joaquin, Delta Mendota, Modesto, Turlock, Merced and Madera groundwater basins. PROVIDE ACCESS TO SAFE DRINKING WATER FOR RESIDENTS BY PROTECTING OR ENHANCING THE QUALITY OF GROUNDWATER DRINKING WATER SUPPLIES FOR THE RESIDENTS OF THE NORTHERN SAN JOAQUIN VALLEY OF CALIFORNIA.