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Waste Water Treatment

What We Do
We treat waste water and septic tank waste that is produced within the limits of the Town of New Canaan. In addition, we operate and maintain the Waste Water Treatment Plant along with three pumping stations and 25 miles of sanitary sewers. 

The mission of the staff at the Waste Water Treatment Plant is to assure that our collection system (including pumping stations) operate effectively to convey waste water from individual contributors to the Treatment Facility. At the Treatment Plant, the mission is to treat the waste material so that the by-products meet the highest federal and state standards.

New Sewer Use Charges
Petition to Appeal Sewer Fee
Sewer Use Rules and Regulations
AECOM - Flow &  Load Review 2022-03-14
Important Information Regarding Sump Pumps
Swimming Pool Discharge

Contact Us
Main Number 203-594-3700 

Fax Number 203-594-3702 

Monday - Friday 7:30 a.m. - 3:15 p.m. 
Saturdays 7:30 a.m. - 2:15 p.m. 

Closed on the following Holidays 
New Year's Day Memorial Day 
July 4th Labor Day 
Thanksgiving Christmas 


Nick Colabella-Superintendent

Wastewater Treatment Plant 
394 Main Street 
New Canaan, CT 06840

Keep sewage out of our stormdrains!

Click here for more information 

Sewer Backup Policy
An overflow in a wastewater line generally results from a blockage in the main line which causes the wastewater to backup into nearby pipes and drains. Stoppages can occur not only in the main sewer lines outside your home, but also within your home or office plumbing system. 

If and when a backup occurs in a Town maintained line, the wastewater will normally overflow out of the lowest possible opening, which is usually a manhole. However in some cases, the overflowing wastewater may exit through lower drains and toilets. If the lowest level of your home or office is above ground level, chances are slim that you will ever have a problem with overflows from the Town’s wastewater lines. However, if the lowest level is below ground level, there is a slightly higher possibility that you may one day be affected by a backup. 

In home and office plumbing systems, the main cause is accumulation of grease, other solids and roots from trees. Also, many items which are too large for wastewater pipes to handle such as disposable diapers and sanitary napkins are often flushed down toilets. Never put disposable diapers or sanitary napkins down the toilet. These were not meant to be disposed of in this manner and besides stopping up lines, could damage your plumbing system. Avoid putting grease down your garbage disposal or any household drain. Not only could it accumulate in town lines, it could also build up in your own system and might eventually require the services of a plumber. All of these items can cause major backups in the Town’s lines as well. 

In the event of a wastewater backup into your home or office quickly close all drain openings with stoppers or plugs. Keep in mind that ceramic plumbing fixtures such as toilets are fragile. Tub, sink and floor drains may need additional weight to keep them sealed. A string mop can be used to help plug toilets. If you suspect the stoppage is in your home plumbing system, don’t run any water down your drains until you or a plumber has cleared the cause of the backup. If the backup appears to be in your neighborhood’s main wastewater line, call the Sewer Department immediately at the numbers listed below. A quick check with adjacent neighbors will help you determine if the blockage is widespread or if it is limited just to your home. 

The Town of New Canaan makes every attempt to prevent backups in the public wastewater system before they occur. Sewer lines are designed to prevent accumulation and blockages. 

In the majority of cases, a special rider on your homeowner’s or renter’s insurance policy is needed to cover damages related to sewage backups or water damage. This optional coverage is generally inexpensive. However, you must usually request it as it is not automatically included in most policies. Customers who may be vulnerable to backups such as those with below grade fixtures are especially advised to investigate this option. 

Like the majority of municipalities around the country, the Town of New Canaan cannot assume financial liability for damages resulting from sewage backups, since most blockages are related to conditions that are beyond the Town’s control. This is why it is important to verify that you are adequately insured. 

If the backup appears to be in the Town’s main line sewer, call the Sewer Department immediately. Crews from the Town’s Treatment Plant are on call 24 hours a day to assist you. If it is verified that the blockage is in your home’s sewer line that runs from the main line to your waste pipe, call a plumber of your choice to clear the obstruction. 

If you notice any case of vandalism to the sewer lines or manholes, or observe wastewater bubbling out of a manhole, please contact the Sewer Department immediately. 


This policy will be open for review by the WPCA on a Bi-Annual basis. 

Thank you 
Water Pollution Control Authority 
Town of New Canaan

How to dispose of Unwanted Medications

How to dispose of unwanted medication - Fact sheet

NEW CANAAN, TOWN OF - POLICE: Medication Drop Box 

Medication drop boxes are secured in the lobby of the police department and are accessible anytime the department is open. Items accepted are over-the-counter medications, prescription medications, medication samples, medications for household pets, medicated lotions or ointments. Items that will not be accepted are needles or other sharps, hazardous waste, thermometers, personal care products (shampoo, etc.). No questions asked, just drop the unwanted medications in and they will be safely and securely destroyed. 
Hours: 24 hr. /7 days 

Frequently Asked Questions

How many gallons of wastewater does the facility treat per day? 
1.2 million gallons per day on an average day. 

How much septage is brought to the plant? 
3 million gallons per year. 

Is there a charge for dumping septage at the plant? 
There will be a septage dumping fee of $105.00 per thousand gallons. 

Can I dump waste water from my Recreation Vehicle at the plant?  
Yes, at no charge, however you must be a New Canaan resident. 

Do you process any waste water from surrounding Towns? 
No. New Canaan only. 

Where is the treated water discharged? 
Into the Five Mile River adjacent to the plant. 

Who do I contact to see if I can hook up to the sewer system? 
Any such proposal must be reviewed and approved by a number of Town Agencies including the Board of Selectmen, Board of Finance, Health Department and others as appropriate. A good place to start is the Public Works Engineering Department. See separate Web site pages. 

Who is responsible for the sewer line from my building to the main sewer on the street? 
All building sewers from the sewer main to the building shall be, in general, installed and maintained by and at the expense of the property owner(s) whose property is being serviced.