Subsurface Sewage Treatment and Disposal Systems (Septic Systems)
NEW: Online Noncompliance Reporting
Effective December 1, 2023, DEEP’s Water Permitting and Enforcement Division (“WPED”) is receiving noncompliance notifications and follow-up reports required under RCSA Section 22a-430 electronically using a web-based platform. The online noncompliance notification and report forms should be used by facilities with discharge permits issued by WPED to report instances of permit noncompliance including but not limited to effluent limit violations, equipment malfunctions, spills, and bypasses. These forms do not replace DEEP’s 24-hour/day Emergency Response Unit call hotline.
Submit a notification of noncompliance here.
Submit a noncompliance follow-up report here.
What is a septic system?
A septic system treats and disperses 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.
|
Type/Size of System |
Contact Information |
|---|---|
| Systems regulated by the Department of Energy & Environmental Protection (DEEP) | |
|
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 |
|
Community systems. |
DEEP Subsurface Sewage Disposal Program 860-424-3025 |
|
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) | |
|
Conventional system with design flow less than 2,000 gallons per day. |
|
|
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 November 28, 2023