The Lewiston Police Department is accredited through the Commission on Accreditation for Law Enforcement Agencies (C.A.L.E.A.). This recognized professional distinction was initially awarded in 1995 with re-accreditation reviews occurring in 2000, 2003, 2006, 2009, 2012, 2015 and 2019; maintaining an adherence to that professional standard.

In November 2019, the Lewiston Police Department was re-accredited and received recognition as a Meritorious Agency for being continually accredited for a period over 20 years, and was given the added distinction of Accreditation with Excellence.