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  • Average homeowner rating star icon4.5
    Average homeowner rating
  • Verified reviews icon908
    Verified sump pump installation services reviews

Top-Rated Sump pump installation pros in Cos Cob - Updated Nov 2026

Avatar for Connecticut Basement Systems, Inc.
Connecticut Basement Systems, Inc.
4.3(
589
)
Sump Pump or Interior Foundation Drains - InstallSump Pump - Repair or Replace

Serving Cos Cob, CT and surrounding areas

Approved

In business since 1987

Free estimates

Warranties offered

"I posted an initial review on 2/21/19 on a job done on 1/11/19 to fix groundwater from coming into our basement. The drainage system and sump they installed was not collecting all the water that was coming in, as we had leaking from several areas along an uneven rock ledge. I had reached out to our salesperson by phone and email and never heard back, so I was very frustrated. About 3 weeks after I posted the review, I did get a call from Jeff Allen, one of the supervisors. To make a long story short, he sent out one of their waterproofing specialists to look at the problem. We had already hired an independent mason to try to remedy the problem but he had not yet had a chance to do the job. Jeff convinced me that CT Basement systems would do absolutely whatever it took to fix my water problem. I cancelled the independent mason. Danny, a mason from CT Basement Systems came out and used a very ingenious method to divert all the water to the originally installed water guard trough and then to the sump. It is working beautifully!! I think Danny is a genius and I am so impressed and thankful for Jeff's perseverance and kindness in making this happen. I am now a very happy customer."
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+12

178 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Atomic Rooter Inc
Atomic Rooter Inc
4.5(
126
)
Sump Pump or Interior Foundation Drains - Install

Serving Cos Cob, CT and surrounding areas

Approved

In business since 1977

Free estimates

Emergency services offered

"Steven was the absolute best… arrived at the very start of only a two hour window, fixed the problem in about an hour. Very polite and courteous. I called three plumbers and he was the first to call me back and the only one who would give me a ballpark figure over the phone. The others wanted to come out and have a look for $70. even though I accurately described the job in detail. I’m thrilled to have a reliable plumber! A more than satisfied customer, Lora Harrigan"
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+6

Response time8 hrs
Response rate100%
1 neighbors recently requested a quote
Avatar for MVP Plumbing and Heating, LLC
MVP Plumbing and Heating, LLC
4.7(
18
)
Sump Pump - Repair or Replace

Serving Cos Cob, CT and surrounding areas

Approved

In business since 2012

Free estimates

Emergency services offered

"Matt was quick to respond to my enquiry. Prompt for the appointment and did excellent work. He was very helpful with other plumbing questions and issues I had around the house. I've had him back to install a waste disposal, an outside faucet and change two sinks in the master. Highly recommend."
Faucet
Modern Powder room
Wall mount faucet
Navien Combi
Old boiler

+1

Response time1 day
Recommended by100%of homeowners
Avatar for L.C. Schede & Sons, Inc.
L.C. Schede & Sons, Inc.
4.0(
294
)
Sump Pump - Repair or ReplaceSump Pump or Interior Foundation Drains - Install

Serving Cos Cob, CT and surrounding areas

Approved

In business since 1922

Free estimates

Emergency services offered

"Installation of a new heat pump A/C system. A little difficulty in getting a final price quote but they did follow through and eventually got the job done. The staff are very courteous and hard working. I would recommend this company."
 $100,000 Kitchen
Master Bath/Spa
Children's Bath
Guest Bath
Response time6 hrs
17 neighbors recently requested a quote
Recommended by88%of homeowners
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Sump Pump Installation FAQs, answered by experts

There are a couple of similar alternatives you may consider for a sewage ejector pump, including a grinder pump or a submersible sump pump. Submersible sump pumps protect your home from flooding from outside water, though, rather than handling wastewater from inside. A grinder pump macerates, or shreds, solid waste before pumping it onward to the sewer line.

To test for toilet leaks, use water coloring in the water tank and see if the water slips into the bowl from the tank. This test will indicate if there’s a problem with the flapper or refill tube. You can also put water coloring in the bowl of the toilet to see if there is a leak there. If there is, you should see the colored water on the outside of the toilet bowl or on the floor. 

If you have a self-cleaning washing machine but you’re still seeing lint, your water pump filter might be clogged. To clean it, you should unscrew the drain hose, then remove the water pump filter. From there, you can inspect it and clean it with warm water before replacing it. Check to be sure your washing machine is functioning by running a short cycle. 

Sump pumps prevent basement flooding, reduce humidity, and protect against water damage.

A sump pump should be placed at least three feet deep in a pit. The rim of the sump pump basin should be level with your basement floor. If you find your pit is too deep, you can fill the bottom with gravel until the rim of the sump pump is flush with the floor.

The Cos Cob, CT homeowners’ guide to sump pump installation services

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