A.Y. McDonald Mfg. Co. is a leading manufacturer of water works, plumbing, pumps, and natural gas products. The company has distinguished itself with exceptional customer service and a proud tradition of quality and reliability since the year 1856. Our corporate headquarters, brass foundry, and main manufacturing plant are located in Dubuque, IA. We also have locations in Albia, IA, and Elizabethton, TN.