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    Average homeowner rating
  • Verified reviews icon30
    Verified water softener services reviews

Top-Rated Water softener pros in Katonah - Updated Nov 2026

Avatar for Westfair Water Systems, Inc.
Westfair Water Systems, Inc.
4.8(
46
)
Water Treatment & Purification System - Install or ReplaceWater Treatment & Purification System - Repair or Service

Serving Katonah, NY and surrounding areas

Approved

In business since 2000

Free estimates

Emergency services offered

"They were great to work with and more competitively priced than culligan. We were selling the home the water system was going into and needed to get the work done quickly before closing to address issues on the inspection report. They were great to work with and very responsive. We ultimately had installed a basic water softener, UV system and new sediment filter housing."
After
after
After
after
Before

+14

Response time10 hrs
30 neighbors recently requested a quote
Recommended by97%of homeowners
Avatar for Old Faithful Pump Co
Old Faithful Pump Co
4.9(
42
)
Water Treatment & Purification System - Install or ReplaceWater Treatment & Purification System - Repair or Service

Serving Katonah, NY and surrounding areas

Approved

In business since 2008

Free estimates

Emergency services offered

"Excellent experience during a bad situation. We discovered our well head was leaking on a Sunday afternoon. Joe, the owner, came out the same day to assess the problem and told us how to avoid burning out the water pump. Joe and his crew came out the next day. Repaired the problem, with no surprises. He took the time to explain what was wrong and what he needed to do. Very professional, courteous, and knowledgeable. Everyone at Old Faithful Pump Co is friendly and it was pleasure doing business with them. We recommend Old Faithful Pump Company to everyone."
Additional Photos
Vernin Proof Well Head
Response time7 hrs
5 neighbors recently requested a quote
Recommended by100%of homeowners
Clear Water Pump & Water Conditioning, LLC
4.8(
31
)
Water Treatment & Purification System - Install or ReplaceWater Treatment & Purification System - Repair or ServiceWell Pump - Repair or Service

Serving Katonah, NY and surrounding areas

Approved

In business since 1997

Free estimates

Customers say: Quick response

"John was great. He came and installed the water softener while we were without power. Then he came back when the power came on to show us how to use it. He was the only person that followed up after we got a quote."
Response time11 hrs
Recommended by100%of homeowners
Noble Plumbing & Heating, LLC
4.4(
31
)
Water Treatment & Purification System - Install or Replace

Serving Katonah, NY and surrounding areas

Approved

In business since 2012

Free estimates

Credit card accepted

"They gave me a very good estimate to replace my hot water heater. We scheduled a time, and they showed up right on time, removed the old one, installed the new one without any leftover mess. The final cost was exactly as stated, with no hidden or additional fees. I was very happy with the quality of their work, and would recommend them to anyone."
Response time4 hrs
Recommended by92%of homeowners
Wilson Plumbing and Heating
4.5(
59
)
Water Treatment & Purification System - Install or Replace

Serving Katonah, NY and surrounding areas

Approved

In business since 2010

Customers say: Quality work

"My water heater was found to be leaking Friday afternoon. Wilson P&H came out that afternoon, verified what I knew, and was back Saturday morning installing a new water heater. Price was what I expected, service was fast and professional. Highly recommend."
Response time4 hrs
Response rate91%
2 neighbors recently requested a quote
Avatar for Cassidy Plumbing and Heating, Inc
Cassidy Plumbing and Heating, Inc
4.5(
31
)
Well Pump - Repair or Service

Serving Katonah, NY and surrounding areas

Approved

Super Service Award Winner

In business since 1992

Emergency services offered

Warranties offered

"Anji recommended four plumbers. Cassidy was the first to respond on Friday afternoon. One other plumber responded but I could not understand his heavy accent, and he asked me if I wanted him to replace the whole burner assembly. That made no sense to me and I questioned him about it. Suddenly he became "too busy" and hung up the phone. Another plumber didn't respond until Monday morning. Too late. The fourth plumber never responded at all. Cassidy asked if it was an emergency or could wait until Monday. I said Monday. and asked what time? I did not get an answer on Friday. Around 8:30P I called and got an answering service which told me that I wouldn't get a response until Monday because their office closed at 8:00P. I had asked about what time on Monday before 6:00P George arrived Monday morning. He was friendly. He knew what he was doing. He replaced the thermocouple. All work was done neatly and professionally. We have hot water again. I'd use Cassidy again."
Heating System
Heating System
Plumbing
The Team
Navien Water Heater

+3

Response time2 days
Response rate100%
9 neighbors recently requested a quote
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Water Softeners FAQs, answered by experts

Water purifiers and water softeners serve different purposes, so the best one will depend on your particular needs. Water purifiers remove contaminants from water (such as bacteria, viruses, and chemicals), leaving you with ultra-clean and safe water. However, water softeners remove minerals from your water so that the water doesn’t leave stains around your house or cause plumbing problems.

A good hardness level for drinking water can vary based on personal preferences, but an ideal level is 3.5 to 7 GPG. This means your water isn’t soft or hard. However, some people prefer the “fresh” taste from the minerals in hard water, while others like the smoother, “slippery” texture of soft water.

Whether you need a permit or license for a water softener installation depends on your location, as requirements vary significantly. Some municipalities require the installer to hold a plumbing license, some mandate a permit and an inspection, and others require both. In some areas, no special permit or license is needed at all.

To determine the rules in your area, you can contact your local building department or consult a local water softener installer or plumber. Often, only certified professionals are authorized to pull the necessary permits, and they will typically handle the entire permitting process for you. Regardless of local laws, it is always recommended to hire a licensed professional to ensure the system is sized and installed correctly. You can use Angi’s state licensing tool to check an installer’s license status.

You can use a commercial water repellent treatment for glass on your shower doors to prevent water spots. Take care to only apply the product to glass. Letting air circulate also helps prevent water spots, as water is less likely to remain on the glass for a long time with good air circulation. Run your vent fan, open a window, and leave the shower door open for about half an hour after using the shower.

Replacing a water softener costs $200 to $6,000, depending on the capacity of the water softener, the type of water softener, and the amount of people living in your home. An ion exchange water softener is the most common type and costs $500 to $3,000. Water distillers, which cost $1,200 to $4,000, and dual-tank models, which cost $1,000 to $5,000, are definitely pricey, but they offer more filtration or capacity, respectively.

The Katonah, NY homeowners’ guide to water softener services

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