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Top-Rated Water treatment pros in Westchester - Updated Nov 2026

Avatar for Pro Water Solutions, Inc.
Pro Water Solutions, Inc.
4.9(
58
)
Water Treatment & Purification System - Install or Replace

Serving Westchester, CA and surrounding areas

Approved

In business since 2001

Free estimates

Credit card accepted

"Just had a water system installed, including RO, carbon and water softener. Only been running a few days so still have to see performance over long-haul. Brad has been very helpful so far and Jack and his team did a good job with the install. They've been responsive to questions, and also came back to install a water pressure regulator for a reasonable cost. So far, so good with ProWater."
Water Softener Carbon System Outdoors
Water Softener Carbon In Garage
Under sink reverse osmosis with upgraded insta hot
Water Filtration
Softener/Uv light

+14

Response time1 day
133 neighbors recently requested a quote
Recommended by98%of homeowners
Avatar for Dutton Plumbing, Cooling, Heating & Electric
Dutton Plumbing, Cooling, Heating & Electric
5.0(
5
)
Water Treatment & Purification System - Repair or Service

Serving Westchester, CA and surrounding areas

Approved

In business since 1987

Free estimates

Emergency services offered

Dutton Plumbing, Cooling, Heating & Electrical runs out of two locations, one in Simi Valley and one in Sylmar. We’ve been working out of this valley since 1987. From those two shops, we cover Ventura County, the San Fernando Valley, Santa Clarita, and Northern Los Angeles County. That’s plumbing, drain and sewer, water heaters, HVAC, and electrical, all handled by the same crews. Nearly four decades in the same region adds up. Our crews have been inside enough houses out here to recognize what a given neighborhood tends to do before they open anything up. Post-war ranch homes behave one way, newer builds behave differently, and we’ve seen it all.

39 neighbors recently requested a quote
Avatar for THE DRAIN CO
THE DRAIN CO
4.7(
66
)
Water Treatment & Purification System - Install or ReplaceWater Treatment & Purification System - Repair or Service

Serving Westchester, CA and surrounding areas

In business since 1969

Emergency services offered

Credit card accepted

"We had a stoppage in our patio drainage system near where several pipes meet. It wasn't clear exactly what the best avenue of attack would be. I suggested one opening which I thought was the straightest shot to the problem, but there was another the tech wanted to try first. That one seemed to lead to a T that couldn't be passed. The tech then used my original suggestion and that turned out to do the trick after some struggle with the blockage. There is usually an additional charge for going down more than one drain hole, but since success came with my original suggestion there was no additional charge which I thought was fair. In any event problem solved quickly and for the agreed upon price.
BTW, concerning the price, there is a rate sheet on their web page that lays it all out which I appreciate. There are 3 tiers: regular, overtime and double time which correspond to regular hours, off hours/weekends, and late hours/sunday/holidays. I had the work done on a Saturday morning so the indicated rate was overtime. However, there was a moment of confusion at the point of final payment when the office claimed it should be double time since it was Thanksgiving weekend. The rate sheet, original over the phone conversation and the quote from the tech on arrival all were for the overtime not the double time rate. To their credit, this was honored without too much fuss. The take away here is make sure you know which rate you are expected to pay especially when you are booking on or near a holiday. For example, is the Saturday of Easter weekend double time? It might be.
Anyway, great experience. I recommend The Drain Co.
"
Recommended by95%of homeowners
Avatar for Dropstars Plumbing
Dropstars Plumbing
5.0(
18
)
Water Treatment & Purification System - Install or Replace

Serving Westchester, CA and surrounding areas

In business since 2023

Free estimates

Credit card accepted

"Very professional and timely service. Came onsite to view specific location and gave me an immediate competitive quote. Took them about 40 minutes to pick up new water heater and an hour to install. Very clean installation."
Electric
Dual Pumps
Pit for Pumps
Dual Pump Piping
Pit for Pumps

+3

Response time7 hrs
Response rate96%
Recommended by82%of homeowners
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