Off-grid living in Connecticut: a property guide
On a septic lot, Connecticut asks whether a code-complying replacement system can still fit after an addition, pool, garage, boundary move or change to continuous occupancy.
B100a site protection
The future disposal area is a present land-use constraint.
The local director of health evaluates whether a code-complying area remains when a property changes use, gains continuous occupancy or adds structures. Where soil data is missing, the owner supplies testing and a plan or sketch. Lot-line work and soil disturbance cannot erase the potential repair area.
Who reviews the septic design?
Local director of health ordinarily permits the residential-scale system.
Local permitting remains involved; DPH plan approval applies to the larger design.
Connecticut DEEP permitting applies.
The state published revised sewage regulations and technical standards effective September 1, 2026. Use the current forms and standards, not an older designer’s assumptions.
Well permit boundary
Nearby public water can block the private-well permit.
Local health approves private-well siting. The rule generally bars a well permit for human occupancy when a qualifying community supply is deemed available within 200 feet of the parcel boundary, measured along a street, alley or easement, subject to specified exceptions. The director also confirms sewer availability or septic feasibility before issuing the well permit.
Read the exact availability ruleParcel sequence
Health approval and building approval move together.
- zoning and dwelling use
- public water/sewer availability
- septic soil/site and reserve area
- well location and permit
- building/trade permits
- final septic discharge approval and occupancy
Connecticut buyer file
Buy the reserve area with the house.
- municipal zoning, wetlands and flood
- survey and public-service distances
- septic permit, as-built and repair area
- well permit, completion and tests
- future addition / occupancy feasibility
- state code and local certificate
Evidence ledger
Official Connecticut sources
Reviewed September 26, 2026. The September 2026 standards are current; parcel decisions remain with local health and land-use offices.
- CT1Subsurface Sewage Disposal Systems
Connecticut Department of Public Health · Current 2026 rules, technical standards, flow thresholds and forms
- CT2Building Conversions and Additions — B100a
Connecticut Department of Public Health · Code-complying replacement area preservation
- CT3Private Wells
Connecticut Department of Public Health · Local siting approval and owner testing duties
- CT4Water Supply Well Permits — Section 19-13-B51m
Connecticut eRegulations · Sewer feasibility and 200-foot public-water availability test
- CT5Drinking Water Forms and Applications
Connecticut Department of Public Health · Current well and drinking-water resources
- CT6Connecticut State Building Code
Connecticut Department of Administrative Services · State code editions and amendments