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  • Average homeowner rating star icon4.5
    Average homeowner rating
  • Verified reviews icon3.9k+
    Verified sump pump installation services reviews

Verified Reviews for Sump Pump Installation pros in Thornton, CO

*The Angi rating for Sump Pump Installation companies in Thornton, CO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Sump Pump Installation needs.

*The HomeAdvisor rating for Sump Pump Installation companies in Thornton, CO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Sump Pump Installation needs.

Last update on September 13, 2026

Find Sump pump installation pros in Thornton

Avatar for Affordable Radon Solutions, LLC
Affordable Radon Solutions, LLC
4.7(
374
)
Sump Pump - Repair or ReplaceSump Pump or Interior Foundation Drains - Install

Serving Thornton, CO and surrounding areas

Approved

Super Service Award Winner

In business since 2011

Free estimates

Emergency services offered

"Matt and Tyson were awesome. On time, professional, respectful of property, solved tricky sump pump install. Knew codes. Efficient, clean, good electronic system for appointments, reminders, etc."
custom fit pipe-garage install
Blending isn't a problem
suction point T intersection into crawl space
Garage Attic Install
close up view of radon mitigation fan

+25

Response time2 days
4 neighbors recently requested a quote
Recommended by95%of homeowners
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Avatar for No Limits Plumbing & Drains
No Limits Plumbing & Drains
5.0(
110
)
Sump Pump - Repair or ReplaceSump Pump or Interior Foundation Drains - Install

Serving Thornton, CO and surrounding areas

Approved

Super Service Award Winner

In business since 2024

Warranties offered

Small jobs welcome

"The installation by "Marco" was spotless and meticulous. He was on-time, excellent communication, walked me through maintenance process, and answered all my questions. He was exceptionally clean, laid down drop cloths, and was the best service professionals I have ever experienced. I did my homework! Use this company, you will not regret your decision. Price was fair and he worked well with my busy schedule."
Sink Rough In
Washer
Sink for bathroom
Shower & Toilet
Before Cleanout

+2

Response time8 hrs
11 neighbors recently requested a quote
Recommended by56%of homeowners
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Avatar for Flatirons Plumbing, Inc.
Flatirons Plumbing, Inc.
4.7(
265
)
Sump Pump - Repair or ReplaceSump Pump or Interior Foundation Drains - Install

Serving Thornton, CO and surrounding areas

Approved

Super Service Award Winner

In business since 2015

Free estimates

Emergency services offered

"Paul did an excellent job replacing the sewage ejection pump. Expensive, but necessary."
Our Flatirons Plumbing Team!
We promise to listen to our customers
The Flatirons Plumbing Team
Response time5 hrs
6 neighbors recently requested a quote
Recommended by83%of homeowners
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Avatar for Heart Heating, Cooling, Plumbing & Electric
Heart Heating, Cooling, Plumbing & Electric
4.7(
91
)
Sump Pump or Interior Foundation Drains - Install

Serving Thornton, CO and surrounding areas

Approved

Super Service Award Winner

In business since 2019

Free estimates

Emergency services offered

"Heart is excellent. I’m a monthly member and highly recommend them. The service my HVAC and recently have done 2 plumbing repairs. Darryl is the plumber who has done 2 jobs. Super professional knowledgeable and clean. Thank you Heart."
Additional Photos
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+24

8 neighbors recently requested a quote
Recommended by82%of homeowners
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Avatar for Waterworx Plumbing
Waterworx Plumbing
4.8(
99
)
Sump Pump - Repair or ReplaceSump Pump or Interior Foundation Drains - Install

Serving Thornton, CO and surrounding areas

Approved

In business since 2016

Free estimates

Emergency services offered

"Jason promptly came out and diagnosed a gas leak for me that we had been unable to locate! Would definitely use again!"
2 neighbors recently requested a quote
Recommended by83%of homeowners
Request Quote
Avatar for Compass Plumbing
Compass Plumbing
5.0(
33
)
Sump Pump - Repair or Replace

Serving Thornton, CO and surrounding areas

Approved

Super Service Award Winner

In business since 2002

Free estimates

Warranties offered

"Jay did an outstanding job installing a new hot water heater. He did a thorough job and made sure everything was in order. I would highly recommend Jay and his company."
Water Heating Systems
Navien Boiler
Response time2 hrs
Response rate96%
1 neighbors recently requested a quote
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Avatar for Precision Plumbing Heating Cooling Electric
Precision Plumbing Heating Cooling Electric
4.5(
198
)
Sump Pump - Repair or Replace

Serving Thornton, CO and surrounding areas

Approved

In business since 1982

Warranties offered

Credit card accepted

"Jeff Scott is knowledgeable, and very friendly. He answered all my questions about heat pumps, furnaces and on demand water heaters. He worked quickly and efficiently and was very helpful."
Response time6 days
16 neighbors recently requested a quote
Recommended by91%of homeowners
Request Quote
Avatar for Afford-A-Rooter
Afford-A-Rooter
4.4(
138
)
Sump Pump - Repair or ReplaceSump Pump or Interior Foundation Drains - Install

Serving Thornton, CO and surrounding areas

Approved

In business since 2003

Free estimates

Emergency services offered

"The company showed up when they said they would and completed the job within the time frame that they stated. Communication was a little rough with the field, but communication with the office was very responsive. Considering the extent of the work and the constraints within which they had to work, there was remarkably little collateral damage done. Unfortunately I was not able to witness the work before it was covered up and so I cannot comment on the quality of the installation, but can say that the company did a good job protecting the surrounding landscaped areas and seemed contentious and thoughtful in their approach to the work. I would definitely work with them again."
Additional Photos
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Additional Photos

+7

Response time5 days
Response rate100%
2 neighbors recently requested a quote
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Sump Pump Installation questions, answered by experts

One common reason a sump pump stops working is improper sizing. Different locations need different sizes and power ratings of sump pumps depending on the typical amount of water the pump needs to manage. If your sump pump is too small for the quantity of water, it can overwork and either burn out or reduce the life of the unit. If the pump is too big, it can overwork and burn out early. 

3/4 HP is stronger than 1/2 HP. Horsepower measures how much weight can be moved and how fast, or the power needed to move 550 pounds one foot in one second. 1 HP equals 550 foot-pounds per second, so the higher the horsepower, the heavier the load it can lift. While 1/2 HP is a standard, powerful option, 3/4 HP has the extra strength to handle heavier, larger doors with ease.

Yes, it’s possible to install a sewage ejector pump outside rather than in a basement. However, there may be some extra steps involved, including running pipes from the inside to the outside of your home and digging (and re-filling) a hole for the basin. If you aren’t comfortable with this type of work, contact a plumbing pro to handle it for you.

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 most common cause of a clogged sump pump is natural debris buildup. As water enters the sump pit, it can carry small pieces of debris that build up over time, or the debris can get caught in the filter. If you forget to cover the pit after cleaning the sump pump and pit, debris can also collect in the pit. Corrosion on the metal discharge pipe can also clog the pump. Additionally, if your pipes freeze, it can prevent water from draining properly and cause a clog.

The Thornton, CO homeowners’ guide to sump pump installation services

From average costs to expert advice, get all the answers you need to get your job done.

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