CAMDEN, N.J. & BRYN MAWR, Pa.--(BUSINESS WIRE)--American Water Works Company, Inc. (NYSE: AWK) ("American Water†) and Essential Utilities, Inc. (NYSE: WTRG) ("Essential†) today announced that each company's board of directors has unanimously approved a definitive agreement to combine in an all-stock, tax-free merger as a leading regulated U.S. water and wastewater public utility with a pro forma market capitalization of approximately $40 billion and a combined enterprise value of approximately. ...