Thomas M. Hannigan (May 30, 1940 – October 9, 2018) was an American businessman and politician.

Quick Facts Member of the California State Assembly from the 4th district, Preceded by ...

Thomas M. Hannigan
Member of the California State Assembly from the 4th district
In office December 4, 1978 – November 30, 1992
Preceded by	Vic Fazio
Succeeded by	David Knowles
Member of the California State Assembly from the 8th district
In office December 7, 1992 – November 30, 1996
Preceded by	Bev Hansen
Succeeded by	Helen Thomson
Director of the California Department of Water Resources
In office March 1, 1999 – June 1, 2003
Preceded by	David N. Kennedy
Succeeded by	Michael J. Spear
Personal details
Born	(1940-05-30)May 30, 1940 Vallejo, California, U.S.
Died	October 9, 2018(2018-10-09) (aged 78) Fairfield, California, U.S.
Political party	Democratic
Spouse	Jan Mape ​ ​ (m. 1963; died 2006)​
Children	3
Education	Santa Clara University
Military service
Allegiance	United States
Branch/service	United States Marine Corps
Years of service	1963-1966
Rank	Captain
Battles/wars	Vietnam War

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Hannigan was born in Vallejo, California. He served in the United States Marine Corps from 1963 to 1966 and was commissioned a captain. In 1962, he graduated from Santa Clara University. He moved to Fairfield, California and was in the real estate business. He served on the Fairfield City Council rom 1970 to 1974 and as mayor of Fairfield from 1972 to 1974. Hannigan also served on the Solano County Board of Supervisors from 1974 to 1978 and served as chair of the board of supervisors. Hannigan served in the California State Assembly from December 4, 1978 - November 30, 1996 and was a Democrat. From 1999 to 2003, Hannigan served as the director of the California Department of Water Resources.^[1][2]

The Fairfield–Vacaville station is named in his honor.^[3][4]

Hannigan's daughter, Erin Hannigan Andrews, is the Supervisor of Solano County.^[5]