The Connecticut State Library issues a retention schedule for the State Government, Towns, Districts, etc. 

These were extracted from the state at one time (link at bottom to validate the latest information)

 

Annual Reports — Permanent

Annual tax levy –– 3 years or until audited, whichever comes later

Audit Reports - Permanent

Bank statements — 3 years or until audited, whichever comes later

Bills paid — 3 years or after audited, whichever comes later

Budget adopted - Permanent

ByLaws— Permanent

Cancelled checks — 3 years or until audited, whichever comes later

Correspondence, paper or electronic – 2 years

Deeds or easements — Permanent

Foreclosure – 1 year after case closed

Insurance — 3 years after audit

Litigation files (court cases) — 5 years after resolution

Meeting records/minutes — Permanent

Website — until updated

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https://portal.ct.gov/csl/departments/public-records/municipal-program/general-schedules?language=en_US