Retired Army Col. Michel J. Blew, 86, a sanitary engineer who served in both World Wars, died of congestive heart failure Thursday at Holy Cross Hospital.

After he retired from military service here in 1951, he remained with the Corps of Engineers as a civilian and was reponsible for the water supply on Army posts around the world.

Col. Blew retired from government service for a second time in 1960 and became a vice president of the Metric Association.

Born in Wabash, Ind., he was a graduate of Indiana University and took graduate work at Yale University.

He was one of a group of young scientists who were commissioned in the Army Sanitary Corps and sent quickly overseas in 1918 to assure clean water supplies for the Army.

After the war, Col. Blew became a sanitary engineer for the city of Phildelphia. He also was a part-time instructor at Drexel Institute of Technology there.

He was recalled to active duty in World War II and was in charge of sewage and water supply for Army installations in the southeastern section of the country. He was transferred to Washington after the war.

Col. Blew, who lived in Takoma Park, was a staff representative of the National Society of Professional Engineers here.

He is survived by a daughtter, Mary Foster, of Hyattsville, and one grandchild.