Integrated Database: Connecticut
Other States:
Population: 3,405,565

Information on the state of Connecticut is available for the following topics. To review this information, click on the links below.

Contacts| Regulations, Statutes & State Codes | Quick Facts | Septic Stats

Onsite Demonstration Programs | Onsite Management Communities



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Robert Scully, Sanitary Engineer III, or
Frank Schaub, Supervising Sanitary Engineer
Connecticut Department of Public Health
410 Capitol Avenue
MS #51 SEW
PO Box 340308
Hartford, Connecticut 06134-0308
(860) 509-7296
(860) 509-7295 (fax)


Regulations, Statutes & State Codes:
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Connecticut State Regulations

Connecticut Constitutions, Statutes and Codes

Regulations and Technical Standards for Subsurface Sewage Disposal Systems
Discharges 5,000 Gallons Per Day or Less
Section 19-13-B103
January 1, 2000

Technical Standards for the Design and Construction of
Subsurface Sewage Disposal Systems Pursuant to Section 19-13-B103
January 1, 2000

Design of Subsurface Sewage Disposal Systems for
Households and Small Commercial Buildings

Onsite regulations for Connecticut were last updated on January 1, 2000. There are no plans to revise existing Codes/regulations prior to July 31, 2002. Several minor technical changes may be made January 1, 2003, e.g., disposal of water softener wastes to separate systems.

In Connecticut, State Health approves conventional subsurface sewage disposal systems based upon total soil adsorption/dispersal. Other technologies require Department of Environmental Protection (DEP) approval. The DEP handles mechanical treatment systems.

Surface discharge for onsite septic disposal systems is not an option in Connecticut; in such case that surface discharge is desired, the DEP should be contacted.

State Code does not allow for drainfield area/size reductions.

State-level funding programs or mechanisms exist to assist homeowners replacing failing systems or installing new systems. Interested persons may contact Bethany Sanderson, CT Department of Economic and Community Development, by phoning (860) 347-4465, ext. 238.

There are no ongoing onsite wastewater demonstration, research, or testing projects in the state.

Connecticut Code does not recognize or require management programs/contracts or management districts to monitor and maintain onsite systems or individual septic disposal systems. Maintenance/management programs may be adopted by local town ordinance or through the local Water Pollution Control Authority.

Connecticut does not track the number of permits issued per year for new construction or for system repair or replacement. An annual survey of towns is required, but data are not always tallied. Records are maintained at the local level.

A failed system is defined as effluent surfacing to the ground, backing up into building plumbing, and/or identified as causing pollution to State groundwaters. Age and improper installation (more than 25 years ago) are cited as the most common reasons for system failure.

The State has a licensing/certification program for onsite wastewater professionals. Only certified agents of the Director of Health and Professional Engineers may perform site evaluations/inspections in the state.


Quick Facts:
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Total number of onsite systems: Approx 380,000 according to 1990 U.S. census.
Number of new systems installed each year: NA
Failure definition: Failure for small systems is defined as surfacing effluent. Larger systems,
regulated by the DEP, are subject to NPDES limits.
Number or proportion of systems presently failing: NA
Number or proportion repaired annually: NA
Number or proportion replaced annually: NA
Number or proportion of repairs or replacements that require alternative technology (e.g.,
sand filters, pressure dosing):
At the present time the use of alternative or advanced systems is
not permitted except for commercial or communal sites, and is regulated by the DEP rather than
the DPH. However, certain technologies considered “alternative” in this document, are
considered conventional under Connecticut code; those are under DPH jurisdiction.
Number or proportion of repairs or replacements that require advanced technology (e.g.,
disinfection, nutrient removal):
See above.

Cost of a conventional septic system installation: $4000-15,000; range $1000-30,000.
Cost of a centralized sewer tie-in (including fees and cost of the sewer lateral): NA


Septic Stats:
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CONNECTICUT 3,287,116 1,320,850 1,026,900 259,669 37,216 4,065 935,541 378,382 6,927
FAIRFIELD 827,645 324,355 259,425 58,485 5,931 514 219,295 103,123 1,937
HARTFORD 651,783 341,812 306,765 31,607 3,096 344 294,611 46,158 1,043
LITCHFIELD 174,092 74,274 36,350 33,187 3,305 1,432 37,364 35,814 826
MIDDLESEX 143,196 61,593 36,763 21,101 3,542 187 26,928 34,271 394
NEW HAVEN 804,219 327,079 280,768 41,816 3,994 501 264,827 60,899 1,353
NEW LONDON 254,957 104,461 69,049 26,206 8,687 519 54,908 48,831 722
TOLLAND 128,699 46,677 19,740 22,734 3,968 235 18,610 27,726 341
WINDHAM 102,525 40,599 18,040 17,533 4,693 333 18,728 21,560 311


Onsite Demonstration Programs:
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No information is available on Onsite Demonstration Programs in Connecticut.

Onsite Management Communities:
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