Connecticut General Statutes,Chapter 830, Sec. 47a-15. Noncompliance by tenant… Landlord's remedies….if there is a material noncompliance…which materially affects the health and safety of the other tenants or materially affects the physical condition of the premises…and the landlord chooses to evict based on such noncompliance, the landlord shall deliver a written notice to the tenant specifying the acts or omissions constituting the breach... For the purposes of this section, "serious nuisance" means (A) inflicting bodily harm upon another tenant or the landlord or threatening to inflict such harm with the present ability to effect the harm and under circumstances which would lead a reasonable person to believe that such threat will be carried out, (B) substantial and willful destruction of part of the dwelling unit or premises, (C) conduct which presents an immediate and serious danger to the safety of other tenants or the landlord, or (D) using the premises or allowing the premises to be used for prostitution or the illegal sale of drugs…that the tenant failed to require other persons on the premises with his consent to conduct themselves in a manner that will not constitute a serious nuisance…the burden shall be on the tenant to show that he had no knowledge of the creation of the serious nuisance.
Sec. 47a-32. (Formerly Sec. 52-540). Nuisance defined. In any action of summary process based upon nuisance, that term shall be taken to include, but shall not be limited to, any conduct which interferes substantially with the comfort or safety of other tenants or occupants of the same or adjacent buildings or structures. [Note: this last sentence provides the legal basis for adjacent residents to file a lawsuit against landlords who fail to take action against “nuisance tenants”.]