The ECC has become a lacrosse powerhouse, seeing six ECC teams win the Division II Men's Lacrosse championship over the past 10 years. In addition, at least 1 ECC team has competed in 13 the last 14 championship games. Recent ECC champions include Adelphi (1998, 1999, 2001), C.W. Post (1996, 2006 Tri-Champion), Dowling College (2006 Tri-Champion), NYIT (1997, 2003, 2005, 2008), and Mercyhurst College (2006 Tri-Champion, 2007)
Two changes to the conference membership were announced in the fall of 2018. First, it was announced on October 3, 2018 that Long Island University would unite its two athletic programs—the Division II LIU Post program and Division Iprogram at LIU Brooklyn—into a single Division I program under the overall university name effective in 2019–20.[1] Second, it was announced on December 7, 2018 that beginning with the 2020 season (2019–20 school year), Frostburg State University will join the conference as an associate member in men's lacrosse, contingent on being accepted into Division II by the NCAA.[2]
The next change in conference membership was announced in March 2019, when the College of Staten Island (CSI), preparing to begin a transition from NCAA Division III, was accepted as a member effective with the 2020–21 school year.[3] The following August, Tusculum University was announced as a bowling affiliate, effective in 2019–20.[4] In March 2020, then-current Division III member D'Youville College ("University" since 2022) was announced as a future member effective in 2020–21, contingent on NCAA approval of that school's transition to D-II;[5] the NCAA's acceptance was officially announced on July 10, 2020.[6]
In December 2021, the University of Bridgeport published its acceptance into the Central Atlantic Collegiate Conference as its new member for the 2022–23 school year.[7]
2000 - Two institutions left the NYCAC to join their respective new home primary conferences: New Jersey Tech (NJIT) to join the Central Atlantic Collegiate Conference (CACC) and Saint Rose to join the NE-10, both effective after the 1999-2000 academic year.
2002 - The University of New Haven joined the NYCAC, effective in the 2002-03 academic year.
2005 - Two institutions left the NYCAC to join their respective new home primary conferences: Philadelphia to join the CACC, and LIU–Southampton to discontinue its athletic program and close the school, both effective after the 2004-05 academic year.
2005 - Mercyhurst University joined the NYCAC as an affiliate member for men's lacrosse, effective in the 2006 spring season (2005-06 academic year).
2006 - The NYCAC has been renamed as the East Coast Conference (ECC), effective in the 2006-07 academic year.
2006 – Dominican College of New York, known since 2022 as Dominican University New York, joined the ECC as an affiliate member for men's lacrosse, effective in the 2007 spring season (2006-07 academic year).
2008 - Adelphi left the ECC to join the NE-10, effective after the 2007-08 academic year.
2009 - Two institutions left the ECC to join their respective new home primary conferences: Adelphi to join the NE-10, and Concordia (N.Y.) to join the CACC, both effective after the 2008-09 academic year.
2012 - Three institutions left the ECC as affiliate members: Lake Erie and Seton Hill for men's and women's lacrosse for men's lacrosse, and Mercyhurst and Wheeling Jesuit for only men's lacrosse, all effective after the 2012 spring season (2011-12 academic year).
2012 - Georgian Court University joined the ECC as an affiliate member for men's & women's indoor track & field, effective in the 2007 spring season (2006-07 academic year).
2013 - Daemen College ("University" since 2022) joined the ECC, effective in the 2013-14 academic year.
Three institutions left the ECC as affiliate members: Chestnut Hill and Dominican (N.Y.) for men's lacrosse, and Salem for bowling, all effective after the 2017 spring season (2016-17 academic year).
Wilmington University of Delaware joined the ECC as an affiliate member for bowling (with Chestnut Hill rejoining for that sport), effective in the 2018 spring season (2017-18 academic year).
2018
Franklin Pierce left the ECC as an affiliate member for bowling, effective after the 2018 spring season (2017-18 academic year).
Bloomfield College and Caldwell University joined the ECC as affiliate members for bowling, effective in the 2019 spring season (2018-19 academic year).
2019
Long Island University, the parent of LIU Post, announced that it would merge the Post athletic program with the D-I athletic program of its Brooklyn campus after the 2018–19 academic year, creating a D-I program that now competes as the LIU Sharks.
New York Tech (NYIT) left the ECC to announce that the school would suspend its athletic programs until further notice (at least two years), effective after the 2019-20 academic year.
2023 – The ECC announced it would sponsor men's volleyball in the 2024 season (2023–24 school year) with four schools, three of which started men's volleyball programs in that season. Full members Roberts Wesleyan and St. Thomas Aquinas were joined by associates American International College and Dominican (NY). Alliance University was originally announced as a fifth sponsoring member, but the university announced it would permanently close on July 1 before they had played a single game. Of these schools, only American International played men's volleyball in the 2023 season.[9]
2024
Lincoln (PA) left the ECC as an affiliate member in baseball and women's soccer, effective after the 2023-24 academic year.
Mercyhurst left the ECC as an affiliate member for bowling, effective after the 2023-24 academic year.
^Long Island University merged the Post athletic program with the NCAA Division I program of its Brooklyn campus in 2019. The merged program inherited the Division I membership of the Brooklyn campus, and now competes in the Northeast Conference as the LIU Sharks.
^As of July 1, 2022, New York Tech (NYIT) suspended its athletic program after the 2019–20 school year.
^Merged with Thomas Jefferson University, a healthcare-only institution with no athletic program, in 2017. The PhilaU athletic program, now branded as "Jefferson", moved in its entirety to the merged institution.
^Alliance was announced as a men's volleyball associate on May 17, 2023. However, the university later announced it would shut down permanently on September 1, 2023, before they had played a single game in the ECC.
^Known as Dominican University New York since 2022. Joined the ECC for men's volleyball in 2023–24.
^Although football is an official NCAA sport, the only ECC members with football programs, Molloy and St. Thomas Aquinas, play sprint football, a weight-restricted variant that is not governed by the NCAA.
^De facto Division I sport. The NCAA conducts a single fencing championship open to members of all three divisions.