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Top-Rated Water treatment pros in Rancho Cucamonga - Updated Nov 2026

Avatar for Service Flow Plumbing
Service Flow Plumbing
5.0(
23
)
Water Treatment & Purification System - Install or Replace

Serving Rancho Cucamonga, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2022

Free estimates

Emergency services offered

"Drew came out and did an excellent job diagnosing my clogged bathtub drain. He was on time, efficient, very descriptive in his repair, left left the job totally cleaned up. And it needs to be stated that his price was very reasonable. I’m so happy that I have now found my new go to plumber. I highly recommended Service Flow to my family, friends and to you."
Sewer Main Valve
Sewer Main Valve
Sewer Main Valve
Sewer Main Valve
Sewer Main Valve

+81

Response time8 hrs
Response rate98%
22 neighbors recently requested a quote
Avatar for Diamond House Construction, Inc.
Diamond House Construction, Inc.
4.4(
150
)
Water Treatment & Purification System - Install or ReplaceWater Treatment & Purification System - Repair or Service

Serving Rancho Cucamonga, CA and surrounding areas

Approved

In business since 2018

Free estimates

Emergency services offered

"I recently had the pleasure of working with Joshua at Diamond House, and I couldn't be happier with the experience. From start to finish, he demonstrated professionalism, efficiency, and excellent customer service. My pipes were old, corroded, and causing issues in almost every part of my house from faucets to my water heater and water pressure. When I reached out for a repiping project, they responded quickly and scheduled an in-home consultation right away. Their team was punctual, arriving exactly when they said they would. Joshua walked me through the process of replacing my aging pipes and even gave me a few options that fit my budget. If any unexpected issues came up (as they sometimes do with older homes), he discussed them with me before proceeding. This level of communication gave me peace of mind. Although repiping is a significant investment, I felt that their pricing was fair for the high level of service I received. The long-term benefits of upgraded plumbing have already made a difference in my water pressure and quality. They also provided a warranty on all of their work and included yearly maintenance on my water heater and water filter/descaler. Diamond House Plumbing exceeded my expectations, and I would highly recommend them to anyone in need of repiping or other plumbing work."
Clogged Drains
1250-gallon Septic tank
Flowtech Filter Installation
Septic pump and install / Service
1250-gallon Septic tank

+36

Response time3 hrs
Response rate90%
18 neighbors recently requested a quote
Avatar for ASCENT PLUMBING INC
ASCENT PLUMBING INC
4.7(
99
)
Water Treatment & Purification System - Repair or ServiceWater Treatment & Purification System - Install or Replace

Serving Rancho Cucamonga, CA and surrounding areas

Approved

In business since 2018

Free estimates

Emergency services offered

We are committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business.

Sink Install
Sink Install
Sink Install
Sink Install
Sink Install

+3

19 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for GG's Plumbing, Inc.
GG's Plumbing, Inc.
5.0(
11
)
Water Treatment & Purification System - Install or ReplaceWater Treatment & Purification System - Repair or Service

Serving Rancho Cucamonga, CA and surrounding areas

Approved

In business since 2025

Free estimates

Credit card accepted

"We had a great experience with GG’s Plumbing at our cabin in Lake Arrowhead. We originally hired them to install a whole-house water shut-off system, and the job was done quickly and professionally. While they were there, the team noticed that our pipes weren’t properly insulated — something that can obviously become a real issue in the mountains during winter. What I appreciated most was their approach: they didn’t pressure us at all. They simply explained the risk, gave us the option to fix it now or later, and let us decide. That kind of honesty goes a long way. We chose to go ahead and have the insulation done, and I’m glad we did. Their team was easy to work with, the communication (mostly through text) was fast and clear, and everything was handled smoothly. Reliable, knowledgeable, and straightforward — I would absolutely recommend GG’s Plumbing."
Water repipe
Water repipe
Avatar for Estelle Plumbing
Estelle Plumbing
5.0(
18
)
Water Treatment & Purification System - Repair or Service

Serving Rancho Cucamonga, CA and surrounding areas

Approved

In business since 2021

Free estimates

Credit card accepted

"The technician, Jacob Estelle, was extremely knowledgeable, and professional. Our ongoing plumbing issue was resolved in a timely manner, and at a price point that was to be expected. The Estelle plumbing team is our new best friends."
$89 Drain Clearing
Open Drain Line
Same- Day Service
$89 Leak Detections
We Find Leaks $89

+2

Response time4 hrs
Response rate100%
1 neighbors recently requested a quote
Avatar for We Care Plumbing, Heating and Air - Murrieta
We Care Plumbing, Heating and Air - Murrieta
4.3(
137
)
Water Treatment & Purification System - Install or ReplaceWater Treatment & Purification System - Repair or Service

Serving Rancho Cucamonga, CA and surrounding areas

Approved

In business since 1999

Warranties offered

Credit card accepted

We Care Plumbing, Heating and Air is the trusted plumbing company and HVAC contractor in Murrieta, CA, proudly serving Southern California since 2000. Our team specializes in reliable plumbing, heating, cooling, and indoor air quality solutions for both homes and businesses. Available 24/7, we handle everything from emergency plumbing repairs to complete HVAC installations with unmatched care and professionalism. As a top-rated service provider, we’re dedicated to keeping your family comfortable year-round. Count on We Care Plumbing, Heating and Air for dependable service, honest pricing, and long-lasting results in Murrieta and beyond. \n \nWe Care To Go the Extra Mile! We have 24 hour LIVE answering!

10 neighbors recently requested a quote
Recommended by92%of homeowners
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