Alan Royer Gnau, who built water-treatment facilities, died of a heart attack Thursday at Anne Arundel Medical Center. The Mayo resident was 62.

Born in Catonsville and raised on Durley Lane, he was a 1963 City College graduate.

As a young man, he was a heavy-equipment operator at Cherry Hill Construction Co. He owned Gnau Construction Co. of Edgewater for many years. He built the Crofton and Broadwater sewage-treatment plants.

He owned a 53-foot boat, the Gnautilus, which he sailed to Ocean City in summers for deep-sea fishing. He also enjoyed home entertaining.

Services will be held at 6 p.m. today at the George P. Kalas Funeral Home, 2973 Solomons Island Road in Edgewater.

Survivors include his longtime companion, Constance Schrom of Mayo; and his mother, Evelyn Gnau, also of Mayo.