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Professional Water Treatment & Filtration

The San Gabriel Valley has some of the hardest water in Southern California. Hard water damages pipes, appliances, and water heaters — and it doesn't taste or feel great either. Kevin Shaw Plumbing installs whole-home water filtration and softening systems that protect your investment and improve your quality of life.

✓Whole-home water filtration systems
✓Water softeners — salt and salt-free options
✓Halo Water Systems certified installer
✓Under-sink reverse osmosis systems
✓Water heater protection from scale buildup
✓Improves taste, smell, and quality of water
✓Extends the life of pipes and appliances
✓Free water quality assessment

Common questions

Frequently Asked Questions

Does the SGV have hard water?

Yes — the San Gabriel Valley consistently ranks among the hardest water areas in Southern California, with hardness levels often exceeding 300 mg/L (very hard). This causes scale buildup in pipes, water heaters, and appliances.

What's the difference between a water softener and a water filter?

A water softener removes calcium and magnesium (hardness minerals) through an ion exchange process. A water filter removes contaminants, chlorine, sediment, and other impurities. Many homeowners benefit from both. We'll assess your water and recommend the right solution.

What is the Halo Water System?

Halo is a premium whole-home water conditioning system that treats hardness, sediment, and contaminants without salt or chemicals. It's one of the most effective systems available and requires minimal maintenance.

How much does water treatment installation cost?

A quality whole-home water softener starts around $1,500–$3,000 installed. The Halo system ranges from $2,500–$4,500 installed. Financing is available through Avvance/US Bank.

Will a water softener damage my pipes?

No — a properly sized water softener is safe for all standard plumbing systems. In fact, soft water is gentler on pipes and extends their lifespan by preventing scale buildup.

Customer reviews

What Our Customers Say

★★★★★

"Fast, professional, and fairly priced. The tech explained everything before starting and left the area cleaner than he found it."

Michael T. · Monrovia

★★★★★

"Water heater went out Saturday morning. They had someone out by noon and replaced it same day. Couldn't ask for better response."

Linda R. · Arcadia

★★★★★

"Been using Kevin Shaw for 20 years. Always honest, always on time. New ownership kept everything the same."

David M. · Temple City

Service Areas

Serving the San Gabriel Valley

Monrovia Arcadia South Pasadena Sierra Madre San Marino Glendora Azusa Duarte San Gabriel Rosemead Hacienda Heights Diamond Bar San Dimas La Verne Pomona

Water Treatment & Filtration in Monrovia & the SGV

Professional Water Treatment & Filtration

Frequently Asked Questions

What Our Customers Say

Serving the San Gabriel Valley

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