Cortese served as the Chairman of the Assembly Committee on Local Government for years. In 1990, he switched to become the chairman of the Assembly Committee on Water, Parks, and Wildlife. He carried the landmark Cortese-Knox Local Government Reorganization Act, which is still called a "best seller" by the State Printing Office and is the guide for all local government annexations, boundaries, formations, detachments and new cities. He was named Legislator of the Year by the American Planning Association in both 1985 and 1989. In 1989, The California Council American Institute of Architects also named him Legislator of the Year and Honorary Architect. He was asked to chair the Committee on Water Parks and Wildlife by then Speaker
Willie Brown, during the period of California's 7-year drought, to act as a facilitator between rural, urban and residential water users including north vs. south, and spent an extensive amount of time to that end visiting those entities throughout the state. He authored key legislation involving the fisheries, water use and the method whereby the State Parks System would award concessions. The latter was especially the result of hearings he held regarding the scandal at Asilomar State Beach in
Monterey. Registration of toxic storage facilities and underground tanks was part of a package that led to a registry called "the Cortese list". During the flooding disaster of 1986, Governor
George Deukmejian signed an emergency measure by Cortese that provided one hundred fifteen million dollars in flood relief money. The bill reached the Governor's desk within two weeks of being introduced. Another measure created the autonomous Valley Transit Authority in Santa Clara County. A Cortese measure provided several million dollars for a graphics animation center at the University of California, San Diego.The one bill that Cortese speaks of as being his most rewarding required insurance companies to cover the cost of
mammograms. After at a two-year battle with insurance company opposition, the bill was signed into law and has saved lives. The American Cancer Society named him Legislator Of The Year in 1988. He also carried the Constitutional Amendment that allowed for state education bonds by a fifty percent vote. He carried the bill that guaranteed the vehicle license fee for local governments. As chair of the Local Government committee, Cortese was asked to intervene in the
San Bruno Mountain dispute in
Millbrae and was recognized by both sides as an "official" mediator. After countless hours of meetings, the dispute which had been ongoing for many years was resolved without legislation and without further litigation. Cortese also carried the legislation that led to the settlement of a major shore lands dispute (Pete's Harbor) in nearby
Redwood City, California which had been litigated for fourteen years prior between owner Pete Uccelli and the State Lands Commission. In addition to chairing his own committees, Cortese at one point in his legislative career was asked by the Speaker to serve on several additional committees among which were, Government Organization, Subcommittee On Veterans Affairs, Revenue and Taxation, Joint Legislative Audit Committee, Public Employees Retirement, Seismic Safety Committee, Transportation, Agriculture, Housing, Rural Caucus and the Little Hoover Commission. He also chaired a Select Committee on Neighborhood Violence, a Select Committee on Childcare, and a Committee on Wine Production and Economy under which he held numerous hearings in various states and established the groundbreaking rule for reciprocal shipping. The NAPA Democratic Caucus named him their 1989 Legislator of the Year. The work of the committee was recognized nationally by the
National Conference of State Legislatures, and Cortese was asked to chair a counterpart committee on the national level. That committee brought legislators to Sacramento from all over the country and eventually held hearings across the entire country. In March 1993 the wine industry ask him to represent the United States at the international Vinelink General Assembly in Paris where he and his wife were also guest of Moet Hennessy in Champagne. For a number of years, a traditional, very popular, bi-partisan, open membership, Italian Caucus was chaired by Cortese and Senate Pro Tem David Roberti. It was often attended by the Counsel General of Italy. Landmark legislation, AB202, sponsored by the Seismic Safety Commission included a long overdue update of the Uniform Building Code establishing the Uniform Code for Building Conservation (UCBC). Standards for addressing unreinforced masonry buildings were now required at the local government building permit issuance stage. An additional measure requiring a basic plumber's tape secured around water heaters has prevented what in the past lead to catastrophic earthquake gas and fire damage. Cortese carried a resolution creating the California Italian American Task Force, the membership of which was appointed by Governor
Pete Wilson and included outstanding members of the Italian American community throughout the state. Inquiries were received from all over the country. The National Italian American Foundation named him in their 1987 Salute to Italian Americans in Government. During his legislative career Cortese was recognized as "Legislator of the Year" by a broad spectrum of statewide organizations some of which were cited in the August 5, 1996, Assembly House Resolution of Commendation, No. 79: the El Matador Fellowship Award which is the highest award bestowed by the California Contract Cities Association, the First Legislative Merit Award from the Association of California Water Agencies, the Commitment to Children Award from the Association for the Education of Young Children; in 1995, he received both the Sierra Club Commendation for Environmental Leadership and Legislator of the Year Award from the California Park and Recreation Society, becoming the only legislator to have received the distinction twice. Also, in that year, he was named an honorary member of the California Aquaculture Association. At a statewide conference of the League of California Cities, then San Francisco Mayor
Dianne Feinstein presented Cortese, Chair of the Assembly Committee on Local Government, with a Resolution of Commendation as 1983 Legislator of the Year for having authored major legislation involving local government. He received numerous awards and certificates of appreciation from local service clubs and community organizations. He participated as featured speaker at numerous statewide conferences including: The California Association of LAFCOS, California Supervisors Association, California Contract Cities Association, California State Chamber of Commerce, the
Bay Area Council, California Special Districts Association, Association of California Water Agencies, California Realtors Association, Los Angeles County Employees Association and the
League of California Cities.He and his wife Suzanne were members of a 1983 California Legislator's Mission to Israel. In 1984, he and Suzanne were delegates on the California Sister State Task Force that traveled to Taiwan and established the first Sister State relationship with the Republic of Taiwan pursuant to Senate Concurrent Resolution No. 40. In i988, he received the Coordination Council of North American Affairs Award of Appreciation for Promotion of Sino-American Cultural and Commercial Relations. In that same year, the National Federation of Asian Indian Organizations in America recognized him with their Award in Recognition and Appreciation of Contributions to the Indian Community. He has also been honored with the Ordine al Merito, Order of Merit of the Republic of Italy, the highest ranking honor and most senior order of the Republic, Cavaliere Ufficiale, Knight of the Republic. ==Speakership battle==