Reverse osmosis drinking water system in Pasco
Installed an under-sink reverse osmosis drinking water system in a Pasco home — filter stages, membrane, storage tank, and a dedicated drinking-water faucet, all fitted under the cabinet and tested.
Tri-Cities, Washington
Water Softeners & Treatment in Kennewick, Pasco & Richland
Sonlight Plumbing installs and services the plumbing side of home water treatment for homeowners in Kennewick, Pasco, Richland, West Richland, West Pasco, Prosser, Finley, Burbank, and Benton City: reverse osmosis drinking-water systems, under-sink and whole-house filters, and water softener installation or replacement on an existing loop. You get a written price before any work is approved.
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WA L&I: SONLIPL742NL · Service calls start with a $79 dispatch fee (plus tax). The dispatch fee covers travel to the service location and the plumber's arrival. Diagnostic work, repairs, labor, materials, and permits are not included in the dispatch fee and are quoted separately when needed. Any additional work requires customer approval before charges are incurred. How pricing works →
Qualifying Sonlight-supplied work includes a 1-year parts and labor warranty; terms and exclusions apply.
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Quick answer
Do I need a plumber to install a water softener or a reverse osmosis system?
The equipment is only part of the job. A softener ties into the home's main water line through a loop with a bypass, and a reverse osmosis system needs a supply connection, a drain connection, and a dedicated faucet. Those connections are where leaks and slow drips start. Sonlight makes the connections, tests them under pressure, and confirms the system is running before leaving.
At a Glance
- What this covers
- Reverse osmosis drinking-water systems, under-sink drinking-water filters, whole-house cartridge filters on an accessible main line, water softener installation or replacement on an existing loop, softener bypass valve service, and filter cartridge changes.
- What it does not cover
- Water testing beyond hardness, well or irrigation treatment, and equipment warranty service on a system Sonlight did not supply, which goes back to the manufacturer.
- Good next step
- Read the scope section below, then call, text, or book.
- Current status
- Call or text us to check current availability.
When water treatment work comes up
- Scale on faucets, showerheads, and the inside of the kettle, or a water heater that needs frequent flushing
- Spots on dishes and glassware and soap that will not lather
- A taste or odor in the drinking water that a pitcher filter is not keeping up with
- An existing softener that is bypassed, leaking at the bypass valve, or no longer regenerating
- A reverse osmosis faucet that has slowed to a trickle, or a storage tank that never fills
- Filter cartridges that are overdue and a housing you would rather not open yourself
The plumbing Sonlight handles
- Reverse osmosis drinking-water system installation, company-supplied or customer-supplied
- Under-sink drinking-water filter installation
- Whole-house cartridge filter installation on an accessible main water line
- Water softener installation or replacement on an existing softener loop
- Softener bypass valve service when the bypass leaks or will not turn
- Whole-house filter cartridge replacement
- Leak testing of every connection Sonlight makes
Scope
What the written scope covers before anything is approved
A softener goes on a softener loop: the section of main line, usually in the garage or utility area, that lets the softened water feed the house while the bypass keeps hose bibbs and irrigation on raw water. Sonlight installs and replaces softeners on an existing loop. If the home has no loop, adding one is pipe work on the main line and is quoted separately as a written estimate from the house itself, so you know what is involved before you buy equipment.
A reverse osmosis system needs a cold-water supply connection, a drain connection with an air gap or approved drain fitting, a storage tank, and a dedicated faucet at the sink. Sonlight makes those connections and confirms the system fills and dispenses before leaving. The number of filter stages and the membrane are a product decision; the connections are the plumbing.
Some Tri-Cities jurisdictions require a plumbing permit for a water softener installation. Sonlight confirms the permitting jurisdiction for the address, and the written scope states permit responsibility and any permit cost before approval. The Tri-Cities plumbing permits guide explains how the jurisdictions differ.
Hard water in the Tri-Cities
Hardness varies by city and by water source, and some utilities publish a range rather than one number. Sonlight tests hardness at the house when sizing treatment instead of assuming one figure for the whole area. The hard water guide covers what the minerals do to water heaters, faucets, and fixtures, and when a softener is worth considering. If a softener's salt tank is overfilling, see water softener overflowing.
Customer-supplied equipment
You are welcome to supply the softener, filter, or reverse osmosis system. Sonlight makes the plumbing connections and stands behind that plumbing work; the equipment itself is covered by the manufacturer's warranty between you and the manufacturer, not by a Sonlight product warranty. Our customer-supplied fixtures guide explains what to check before you buy.
The process
How a visit works
Honest, straightforward, and no pressure — here is how Sonlight approaches every job.
1
You tell us what's happening
Share the problem and what you're seeing — by phone, text, the request form, or Book Online.
2
We assess it in person
We look at the actual problem in your home — not a guess over the phone — so the plan fits what is really going on.
3
We explain your options
You get clear options and honest recommendations before any work begins. No pressure, no surprises.
4
You decide
You choose what is right for your home, and the work gets done properly.
You'll get clear options before any work begins, and every connection is checked for leaks before we leave.
A reverse osmosis installation in Pasco is documented on this page, and the same connection and leak-check process applies in West Richland, where the City requires a permit for a softener installation, and across the Tri-Cities. See all service areas → Questions? Contact Sonlight Plumbing →
Related services
You may also need
Water Heater Repair
Sediment from hard water is a common reason a tank water heater runs out of hot water or gets noisy.
Faucet Repair & Installation
Scale-damaged cartridges and aerators, and the dedicated drinking-water faucet an RO system uses.
Shutoff Valves & Angle Stops
The under-sink shutoff an RO system or filter taps into, replaced when it is seized or dripping.
FAQ
Water Treatment — Questions
Local proof of work
Recent Water Treatment Jobs in the Tri-Cities
Real jobs, real photos, real Tri-Cities neighborhoods. Completed work appears here only when real project photos are available.
Documented Sonlight work1 documented job for this serviceNewest documented job: August 20, 2026
Honest Plumbing. Clear Solutions.
Have a plumbing problem? Call, text a photo, or send Sonlight the details.
Upfront pricing: booking a visit starts with the $79 dispatch fee (plus tax). It covers travel to the service location and the plumber's arrival. Diagnostic work and repairs are separate and require customer approval before additional charges are incurred. Not ready to choose a time? Send a service request.