Subsurface Sewage Treatment and Disposal Systems (Septic Systems)
Septic systems treat and disperse wastewater from individual or small numbers of homes and commercial buildings. The type and/or size of the septic system, determines what agency has regulatory authority.
A "conventional subsurface sewage treatment and disposal system" - consists of a house sewer, septic tank followed by a leaching system, any necessary pumps or siphons, and any ground water control system on which the operation of the leaching system is dependent.
A "community subsurface sewage treatment and disposal system" - consists of one subsurface sewage disposal system serving two or more residential buildings, regardless of system size.
An "alternative treatment system" - consists of a sewage treatment system serving one or more buildings that utilizes a method of treatment other than a subsurface sewage disposal system and that involves a discharge to the groundwaters of the state.
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Type/Size of System |
Contact Information |
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| Systems regulated by the Department of Energy & Environmental Protection (DEEP) | |
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Conventional systems with design flows greater than 7,500 gallons per day, including sites where multiple smaller systems on a single "lot" have a combined flow greater than 7,500 gallons per day. |
DEEP Subsurface Sewage Disposal Program 860-424-3025 |
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Community systems. |
DEEP Subsurface Sewage Disposal Program 860-424-3025 |
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Any system utilizing alternative treatment, regardless of size. |
DEEP Subsurface Sewage Disposal Program 860-424-3025 |
| Systems regulated by the Connecticut Department of Public Health (DPH) | |
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Conventional system with design flow less than 2,000 gallons per day. |
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Conventional system with design flow greater than 2,000 gallons per day but less than 7,500 gallons per day. |
DPH Sewage Program |
Additional Information:
General Permit to Discharge from Subsurface Sewage Disposal Systems Serving Existing Facilities
Individual Permit Application for a Subsurface Sewage Disposal System
Guidance Document for Design of Large-Scale On-Site Wastewater Renovation Systems
Department of Public Health (DPH) - On Site Sewage Disposal
Environmental Protection Agency (EPA) - Septic System Information (includes information for individual homeowners)
Content Last Updated October 2019