Conn. Gen. Stat. § 22a-108
Any activity within the coastal boundary not exempt from coastal site plan review pursuant to subsection (b) of section 22a-109, which occurs without having received a lawful approval from a municipal board or commission under all of the applicable procedures and criteria listed in sections 22a-105 and 22a-106, or which violates the terms or conditions of such approval, shall be deemed a public nuisance. Municipalities shall have the authority to exercise all enforcement remedies legally available to them for the abatement of such nuisances including, but not limited to, those under section 8-12. After notifying the municipality in which the activity is located, the commissioner may order that such a public nuisance be halted, abated, removed or modified and that the site of the violation be restored as nearly as reasonably possible to its condition prior to the violation, under the authority of sections 22a-6 and 22a-7. The commissioner may request the Attorney General to institute proceedings to enjoin or abate any such nuisance. Upon receipt of a petition signed by at least twenty-five residents of the municipality in which an activity is located the commissioner shall investigate to determine whether or not an activity described in the petition constitutes a public nuisance. Within ninety days of receipt of such petition, the commissioner shall make a written determination and provide the petitioning municipality with a copy of such determination.
Conn. Gen. Stat. § 22a-108
(P.A. 79-535, S. 14, 25; P.A. 82-250, S. 3, 6.)
Plain language of section provides that, after notifying the municipality, the department can act re an activity within the coastal boundary if the activity required lawful approval but has not been approved by the municipality; the legislature did not intend for the department to never have authority to act under section, despite the fact that a determination had been made that a violation of the act exists, if a municipality declined to bring an action to enforce a cease and desist order. 308 C. 359.