Besides the basics that it must meet the setbacks for the zone (Section 406 of the Zoning Regulations, noted above), and coverage requirements, and needs Environmental Protection Commission approval if it is within 50 feet of a wetland or watercourse and/or Planning and Zoning Commission approval if it is within 100 feet of Mean High Water, Section 364 of the Zoning Regulations apply.
Overall, several permits are required (Swimming Pools, Hot Tubs and Spas Handout (PDF)):
Health Department approval of the backwash and/or filter system and the location of the pool in relation to the septic system and/or well. Contact the Health Department at 203-656-7320 for more information.
Zoning Permit application and accurate map must be submitted to demonstrate compliance with the setback, yard, and lot coverage requirements. If the pool location is near a brook, river, swamp, wetlands or coastal area, additional permits may be required.
Building Permit application with construction plans and details must be submitted to demonstrate compliance with the Connecticut Building Code (structural aspects of the pool, plumbing, electrical hook-up, etc.) Contact the Building Department at 203-656-7347.