Water Filtration System Installation

Licensed & Insured
Since 1989
Written Warranty

Seattle Water Filtration System Installation

Same-Day ServiceBook before 2pm, Mon–Fri

Upfront PricingFlat-rate quotes, no surprises

Written WarrantyOn every install & repair

Cleaner-tasting water, fewer mineral deposits, and peace of mind about what's coming out of your tap, that's what a properly chosen water filtration system delivers. All Phase Plumbing installs whole-home filters, under-sink filters, and reverse osmosis systems across the Seattle area.

Every home's water is different. We start with a water test, recommend the right filtration approach for your concerns and budget, and handle the install cleanly with proper bypass valves and supply-line work.

Call (206) 772-6077 to schedule a filtration consultation.

Filtration Systems We Install

Whole-home sediment and carbon filters
Under-sink drinking water filters
Reverse osmosis (RO) systems
Combination softener and filter systems
Iron, sulfur, and specialty filters for well water
UV disinfection systems

How to Choose the Right Filter

There's no single best filter, it depends on what's in your water. Chlorine taste is a different filter than iron staining, which is different from heavy metals. We start with a free water test, then recommend the right approach for what you actually need (and avoid expensive systems for problems you don't have).

Whole-Home vs. Point-of-Use

Whole-home filters treat all water entering the house, great for chlorine, sediment, and overall taste improvement. Point-of-use systems (under-sink, RO) treat just drinking water, best when you want premium drinking quality without the cost of treating water for showers, laundry, and irrigation.

Schedule Filter Installation

Ready to upgrade your water? Call (206) 772-6077 and we'll test your water, walk through your options, and install the right system.

Water Filtration FAQs

Seattle tap water is generally high quality, but many homeowners want to remove chlorine taste, lead from old plumbing, or improve drinking water specifically. A simple under-sink filter often does the job affordably.

Well water usually needs more comprehensive treatment, sediment, iron, hardness, and sometimes bacteria. We test first and design a system that fits the issues found.

A softener removes hardness (calcium and magnesium) by ion exchange. A filter removes contaminants like sediment, chlorine, or metals. Many homes benefit from both, we can install a combo system.

Depends on the system and water quality. Whole-home sediment filters: 3–6 months. Carbon filters: 6–12 months. RO membranes: 2–3 years. We can set up a reminder service.

Properly sized filters have minimal pressure impact. Undersized systems or clogged filters cause noticeable drops, sizing it right at install matters.

Simple Process

How It Works

Call or Book Online

Tell us what's going on, any time, day or night.

Upfront Quote

We diagnose the problem and give you a flat-rate price before starting.

Same-Day Repair

Our licensed technician fixes it right, usually the same day.

Guaranteed & Clean

We test the work, clean up, and back the repair in writing.

The All Phase Difference

Why Greater Seattle Chooses Us

When you invite a plumber into your home or business, you need to know they are experienced, trustworthy, and fully equipped to handle the job. At All Phase Plumbing, we pride ourselves on delivering top-tier service without the sales pressure or hidden fees.

Our philosophy is simple: diagnose the issue accurately, provide a clear and upfront solution, and execute the repair or installation flawlessly. We invest heavily in the latest technology—from advanced leak detection to high-powered hydro jetting—ensuring that our solutions are not just temporary fixes, but long-term improvements for your property's plumbing infrastructure.

We understand that plumbing emergencies disrupt your life. That's why our dedicated team is on standby 24 hours a day, 7 days a week, ready to restore comfort and safety to your environment.

Licensed & Guaranteed

Every job is done by our own licensed, insured crew, never a subcontractor, and backed in writing.

100% workmanship guarantee

Upfront Flat-Rate Pricing

You get a clear, flat-rate quote before any work begins, so there are never surprise add-ons.

Quoted before we begin

One Call Does It All

Plumbing, drains, sewer, water heaters, and gas, all handled by one trusted local team.

10,000+ jobs completed