Water Filtration
Cleaner, softer water for your entire home — water softeners, reverse osmosis, and whole-home filtration systems
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Water Filtration & Softener Installation
Southern California water is notoriously hard. Mineral buildup damages appliances, leaves residue on fixtures, and affects the taste and quality of your water. We install whole-home water softeners, under-sink filters, and reverse osmosis systems to give you cleaner, softer water throughout your home. Hard water also accelerates damage to your water heater and causes scale buildup in your pipes. We install filtration systems in Ontario, Rancho Cucamonga, Fontana, Pomona, Chino, Corona, Upland, and West Covina.
- ✓Whole-home water softener installation
- ✓Under-sink reverse osmosis systems
- ✓Carbon filtration and UV purification
- ✓Filter cartridge replacement service
- ✓Water quality testing
- ✓Custom solutions for your water needs
What We Cover
Services We Provide
Water Softeners
Whole-home water softeners remove calcium and magnesium, protecting your appliances and leaving skin and hair feeling softer.
Reverse Osmosis
Under-sink RO systems provide pure, great-tasting drinking water by removing contaminants, chlorine, and dissolved solids.
Whole-Home Filtration
Comprehensive filtration systems that treat all water entering your home — every faucet, shower, and appliance gets clean water.
Recent Work
Our Water Treatment Installations
Whole-Home Water Softener Installation
Installed a high-capacity water softener for a family dealing with hard water buildup on fixtures and appliances. The system eliminates scale and extends the life of their water heater and dishwasher.
3-Stage Carbon Filtration System
Installed a 3-stage carbon filtration system for a homeowner concerned about chlorine taste and sediment. The system provides cleaner water to every tap in the house.
Water Softener + Carbon Filter Combo
Complete water treatment installation combining a whole-home softener with a carbon filter. The homeowner noticed softer skin, cleaner dishes, and better-tasting water immediately.
Our Promise
Why Choose Regal?
Honest Pricing
Upfront, transparent quotes before any work begins. No hidden fees, no surprises — even in emergencies.
Fast Response
24/7 availability for emergencies. We arrive quickly and work efficiently to minimize damage.
Quality Workmanship
Every job backed by our commitment to premium craftsmanship and lasting results.
Explore
Other Services We Offer
Emergency Plumbing
Rapid-response emergency plumbing for Ontario, CA and surrounding cities - we’re on call around the clock.
Learn More →Drain Cleaning
Professional clearing of kitchen, bathroom, and main sewer line blockages.
Learn More →Sewer Line Repair
Camera inspection, trenchless repair, and full sewer line replacement.
Learn More →Water Heater Services
Installation and repair of tank, tankless, and heat pump water heaters.
Learn More →Slab Leak Detection
Electronic leak detection beneath concrete slabs with minimal disruption.
Learn More →Hydrojetting
High-pressure water jetting to scour pipe walls and restore full flow.
Learn More →Gas Leak Detection
Licensed gas line detection, repair, and pressure testing for safety.
Learn More →Pipe Repair
Expert pipe repair and replacement for copper, PVC, and galvanized systems.
Learn More →Commercial Plumbing
Full-service commercial plumbing for restaurants, apartments, HOAs, and businesses across Ontario & the Pomona Valley.
Learn More →Service Coverage
Cities We Serve
We provide fast, local plumbing service throughout the Inland Empire.
Treatment Options
Our Water Treatment Systems
3-Stage Carbon Filtration
Removes chlorine, sediment, and odors from your water. Great for improving taste and protecting appliances from chemical damage.
Whole-Home Water Softener
Eliminates hard water minerals that damage pipes and appliances throughout the Inland Empire. Softer water means longer-lasting plumbing, better soap lathering, and no more white scale.
Softener + Carbon Filter Combo
Full treatment combining softening and filtration for the cleanest water possible. Removes hard minerals, chlorine, and contaminants in one system.
Reverse Osmosis + Whole-Home System
Complete purification for drinking water and whole-home protection. The RO system delivers pure drinking water while the whole-home system softens and filters every tap.
Local Water Quality
Hard Water in the Inland Empire
The Inland Empire has some of the hardest water in all of California. Cities like Ontario, Rancho Cucamonga, Fontana, and Corona regularly test above 200 parts per million (ppm) for hardness — well above the EPA threshold of 120 ppm.
This excessive mineral content causes white crusty buildup on faucets and showerheads, reduces the lifespan of your water heater by 3–5 years, and leads to clogged pipes and slow drains. Homeowners across Pomona, Upland, West Covina, and Chino deal with the same problem.
A professionally installed water softener or filtration system solves all of these issues. Our team at Regal Plumbing has installed hundreds of systems across 32+ cities in the Inland Empire. We handle every step — water testing, system selection, professional installation, and ongoing maintenance.
LOCAL WATER QUALITY
Why Water Quality Is Poor in Ontario CA and Surrounding Cities
Southern California's water supply carries some of the highest total dissolved solids (TDS) levels in the state. Much of the tap water in Ontario and Rancho Cucamonga originates from groundwater wells that pass through mineral-rich soil and rock formations, picking up calcium, magnesium, and other dissolved minerals along the way. TDS readings in these areas frequently exceed 400–600 parts per million — well above what most water treatment experts consider ideal for household use.
Homeowners in Fontana, Pomona, and Chino face the same challenge. High mineral content leaves white residue on everything the water touches, dries out skin and hair, and creates stubborn scale inside pipes and appliances. For water filtration in Ontario CA and surrounding cities, addressing these minerals at the source is the most effective solution.
The problem compounds over time. Without treatment, mineral deposits narrow pipes, reduce water pressure, and force appliances like water heaters and dishwashers to work harder. Residents in Corona, Upland, and West Covina often don't realize the damage until a plumber discovers heavy scale buildup during a repair call.
SYSTEM OPTIONS
Types of Water Filtration Systems We Install
We install a full range of water treatment systems tailored to the specific needs of homes in Ontario and Rancho Cucamonga. Whole-home water softeners use ion exchange technology to remove calcium and magnesium — the minerals responsible for hard water scale. These systems protect every pipe, fixture, and appliance in your home from buildup. Soft water also extends the life of your water heater by preventing sediment accumulation inside the tank.
Reverse osmosis (RO) systems are installed under the kitchen sink and produce purified drinking water by forcing tap water through a semi-permeable membrane. This removes up to 99% of dissolved contaminants including lead, fluoride, arsenic, and nitrates. Carbon filtration systems target chlorine, volatile organic compounds, and unpleasant tastes or odors — they're an excellent whole-home option for improving everyday water quality.
For homes with bacterial concerns or well water, UV purification systems use ultraviolet light to neutralize bacteria, viruses, and other microorganisms without adding chemicals. Many homeowners get the best results by combining two or more of these technologies into a single treatment setup customized for their water conditions.
KNOW THE SIGNS
Signs You Need a Water Filtration System
If you're noticing any of these issues in your home, hard water or poor water quality is likely the cause: scale buildup on faucets and showerheads, white spots on dishes after washing, dry skin and hair even with moisturizing products, a bad taste or chlorine smell from the tap, frequent water heater issues or premature failure, and white chalky residue on pots after boiling water.
These are all telltale signs that your water contains excessive minerals or contaminants. Homeowners in Fontana and Corona report these problems regularly — and the good news is that a properly sized filtration or softener system eliminates all of them. Our team performs a free water quality assessment to identify exactly what's in your water before recommending any equipment.
SERVICE AREA
Water Filtration Installation Across Our Service Area
Regal Plumbing & Rooter provides whole home water softener installation in Ontario CA and water softener installation in Rancho Cucamonga CA along with every city we serve. Whether you need a basic carbon filter or a complete whole-home treatment system, we bring the same expert service to every job.
We also install and service filtration systems in Fontana, Pomona, Chino, Corona, Upland, and West Covina. Check our current specials for seasonal offers on water treatment systems, or get a free quote to find the right solution for your home. Every installation includes a water quality test, professional setup, and a full walkthrough so you know exactly how your system works.
Common Questions
Water Filtration FAQs
Ask about our current specials when you call.
Better Water Starts with One Call
Free water quality assessment and expert filtration recommendations
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