State licence
WA contractor licensing
Check the licence with the state board before work starts.
Open the official lookup →Water treatment service near me
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Water treatment service in Seattle, WA
There are 30 verified water firms listed in Seattle, WA. Listings are compiled from public business records and checked against the WA contractor licensing; each record shows the date it was last verified.
Verified listings30 verified listingsSpring band $2,500–$6,000WA licence + Seattle permit links
Information last verified: 8 November 2026. Dataset compiled 8 November 2026.
What qualifies as a listing
Sewer lines in Seattle
Water treatment service work in Seattle follows the same pattern as the rest of WA: the failure mode decides the method, not the other way round.
Permit rules in Seattle are set locally. Ask the city whether your job needs a permit and who pulls it.
What water work costs in Seattle
The national range is from the site’s cost guide, checked 2026-11-08. The local column applies the 1.00× metro factor and rounds to $5. It is a planning band, not a quote.
| Job | National range | Seattle planning band | What it includes |
|---|---|---|---|
| Whole-house softener, installed | $2,500–$6,000 | $2,500–$6,000 | Typical US range |
| Whole-house filtration | $3,500–$9,000 | $3,500–$9,000 | Typical US range |
| Well tank replacement | $1,200–$2,800 | $1,200–$2,800 | Typical US range |
| Well pump replacement | $900–$2,200 | $900–$2,200 | Typical US range |
| Reverse osmosis, installed | $3,500–$8,000 | $3,500–$8,000 | Typical US range |
| Annual service, no salt | $150–$400 | $150–$400 | Typical US range |
Editorial metro factor, not a measured price index. The factor is not a measured local price index; it estimates labour and permit overhead. A quote that is far below the band usually has a smaller scope, not a better price.
Licence and permit checks for Seattle
Local permit
Seattle permit office
Ask whether the job needs a permit and who pulls it.
Open the permit office →These links go to the official state or city page. The directory does not file permits and does not verify a contractor’s current insurance for you.
Sewer line firms in Seattle, WA
30 verified records. The order is the dataset order, not a ranking. Each card shows the date its record was last verified.
Verified
Pure Water Northwest
Water treatment service contractor
- Address
- 10811 NE State Hwy
Seattle, WA - Phone
- (360) 908-8947
- Website
- Not published
- Rating
- 4.8 / 5 · 245 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Northwest Water Treatment, Inc.
Water treatment service contractor
- Address
- 19312 Patterson Rd
Seattle, WA - Phone
- (253) 630-7177
- Website
- Not published
- Rating
- 5.0 / 5 · 10 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Northwest Water Treatment LLC
Water treatment service contractor
- Address
- 8600 Bender Rd
Seattle, WA - Phone
- (360) 469-5658
- Website
- Not published
- Rating
- 4.6 / 5 · 61 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Custom Pure -The Water Store
Water treatment service contractor
- Address
- 1514 NE 179th St
Seattle, WA - Phone
- (206) 363-0039
- Website
- Not published
- Rating
- 4.9 / 5 · 64 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Meadow Lake Water Treatment
Water treatment service contractor
- Address
Seattle, WA- Phone
- (360) 625-6033
- Website
- Not published
- Rating
- 4.6 / 5 · 32 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Seattle Water Filtration
Water treatment service contractor
- Address
Seattle, WA- Phone
- (206) 258-7880
- Website
- Not published
- Rating
- 5.0 / 5 · 5 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Sweetwater LLC
Water treatment service contractor
- Address
Seattle, WA- Phone
- (866) 691-4214
- Website
- Not published
- Rating
- 5.0 / 5 · 4 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Culligan of Seattle, WA
Water treatment service contractor
- Address
- 1808 B St
Seattle, WA - Phone
- (206) 495-6090
- Website
- Not published
- Rating
- 4.5 / 5 · 228 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Culligan Quench - Seattle
Water treatment service contractor
- Address
Seattle, WA- Phone
- (253) 313-1897
- Website
- Not published
- Rating
- 4.6 / 5 · 56 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
PureSpring Water Softeners & Filters
Water treatment service contractor
- Address
- 2710 4th Ave
Seattle, WA - Phone
- (425) 473-1530
- Website
- Not published
- Rating
- Not published
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
West Point Treatment Plant
Water treatment service contractor
- Address
- 1400 Discovery Park Blvd
Seattle, WA - Phone
- (206) 263-3800
- Website
- Not published
- Rating
- 3.9 / 5 · 25 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Water Quality Lab
Water treatment service contractor
- Address
- 800 S Stacy St
Seattle, WA - Phone
- (206) 684-7834
- Website
- Not published
- Rating
- 4.9 / 5 · 7 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Wellness Water Filtration Systems
Water treatment service contractor
- Address
- 3215 1st Ave
Seattle, WA - Phone
- (833) 652-5011
- Website
- Not published
- Rating
- Not published
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Kangen Water
Water treatment service contractor
- Address
Seattle, WA- Phone
- (206) 321-7066
- Website
- Not published
- Rating
- 5.0 / 5 · 20 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Roto-Rooter Plumbing & Water Cleanup
Water treatment service contractor
- Address
- 121 Lakeside Ave
Seattle, WA - Phone
- (206) 777-0128
- Website
- Not published
- Rating
- 4.6 / 5 · 2691 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Northwest Water Systems, Inc.
Water treatment service contractor
- Address
- 1550 Woodridge Dr
Seattle, WA - Phone
- (360) 876-0958
- Website
- Not published
- Rating
- 3.3 / 5 · 17 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
King County Wastewater Treatment Division
Water treatment service contractor
- Address
- 201 S Jackson St
Seattle, WA - Phone
- (206) 477-5371
- Website
- Not published
- Rating
- 1.7 / 5 · 13 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Seattle Water Department
Water treatment service contractor
- Address
Seattle, WA- Phone
- (206) 684-3000
- Website
- Not published
- Rating
- 4.0 / 5 · 4 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
King County Natural Resources
Water treatment service contractor
- Address
- 201 S Jackson St
Seattle, WA - Phone
- (206) 205-3100
- Website
- Not published
- Rating
- 4.7 / 5 · 3 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
South West Plumbing, Heating, Air, & Electric
Water treatment service contractor
- Address
- 7717 Detroit Ave
Seattle, WA - Phone
- (206) 536-2558
- Website
- Not published
- Rating
- 4.8 / 5 · 12016 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Beacon Plumbing, Heating, Electrical & Mechanical Inc - Seattle
Water treatment service contractor
- Address
- 515 7th Ave
Seattle, WA - Phone
- (206) 485-0433
- Website
- Not published
- Rating
- 4.6 / 5 · 3719 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
JKA Well Drilling & Pumps
Water treatment service contractor
- Address
- 17120 Tye St
Seattle, WA - Phone
- (855) 817-7300
- Website
- Not published
- Rating
- 4.9 / 5 · 224 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
DTEC Systems LLC
Water treatment service contractor
- Address
- 3012 16th Ave
Seattle, WA - Phone
- (206) 281-8757
- Website
- Not published
- Rating
- Not published
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Lunexa Restoration
Water treatment service contractor
- Address
- 1200 6th Ave
Seattle, WA - Phone
- (564) 464-3472
- Website
- Not published
- Rating
- 5.0 / 5 · 19 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Aqua Quip - Seattle
Water treatment service contractor
- Address
- 3447 4th Ave
Seattle, WA - Phone
- (206) 624-4394
- Website
- Not published
- Rating
- 3.9 / 5 · 152 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Water's Edge Natural Medicine
Water treatment service contractor
- Address
- 1000 2nd Ave
Seattle, WA - Phone
- (206) 966-4522
- Website
- Not published
- Rating
- 4.1 / 5 · 22 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Technical Waterproofing, Inc.
Water treatment service contractor
- Address
- 126 S Findlay St
Seattle, WA - Phone
- (206) 768-8324
- Website
- Not published
- Rating
- 4.5 / 5 · 6 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
ASA Pools & Hot Tubs
Water treatment service contractor
- Address
- 3627 Stone Way
Seattle, WA - Phone
- (206) 202-1454
- Website
- Not published
- Rating
- 5.0 / 5 · 48 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Puget Seattle Plumbers and Drain Cleaning Co.
Water treatment service contractor
- Address
- 81 Pike St
Seattle, WA - Phone
- (206) 360-0078
- Website
- Not published
- Rating
- 4.9 / 5 · 14 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Verified
Global Diving & Salvage, Inc.
Water treatment service contractor
- Address
Seattle, WA- Phone
- (206) 623-0621
- Website
- Not published
- Rating
- 4.6 / 5 · 18 reviews
- Place ID
- Not recorded
- Record
- Information last verified: 8 November 2026
Firms in Seattle, WA are shown in the order supplied by the dataset, not by rating or payment. No placement is sold. Each name opens that firm’s own profile page.
How this list was built
The directory starts from public business records: the firm’s own website, its published address and phone number, and the state or city licence register named above. A record is marked verified only when a person has checked the name, address, phone and licence against those sources and recorded the date. The place_id field is kept so a future rebuild can match the same entity without guessing.
The national cost band comes from the site’s cost guide. The metro factor is an editorial estimate, not a survey. No rating, review text, price or availability is invented for a verified page; where a public rating is shown it is attributed and dated.
If a record is wrong, the firm can ask for a correction or removal.Corrections: contact@watertreatmentpro.com. Read the fulllisting verification method.
Water treatment service in Seattle: common questions
How many water firms are listed in Seattle?
30 verified water firms are listed in Seattle, WA. 0 publish a website, and 30 records have been verified. The city page is generated only because the dataset contains at least one genuine listing record; a city with no record has no page.
What does water treatment service cost in Seattle?
The directory’s planning band for a torsion spring replacement is $2,500–$6,000. It is the national range ($2,500–$6,000, checked 2026-11-08) multiplied by an editorial metro factor of 1.00 and rounded to $5. It is an estimate, not a local price survey, and not a quote. Get three written quotes for the same scope.
Does WA license water contractors?
Check the licence with the state board before work starts. The official lookup is the WA contractor licensing, linked on this page. A licence or registration number is a starting point, not a substitute for checking insurance and the scope of the work.
Do I need a permit for a water in Seattle?
Ask whether the job needs a permit and who pulls it. The permit office is the Seattle permit office, linked on this page. If the contractor says no permit is needed, ask them to put the reason in writing.
Water treatment service near Seattle
The closest metros in this directory, by straight-line distance. Each link opens that city’s own cost, licence and permit page.
Guides for Seattle homeowners
What water treatment service costs
Installed ranges by job, and the five lines every quote should show.
Read the guide →Diagnose the problem first
Symptom to cause, what proves it, and what not to do first.
Read the guide →How to choose a contractor
Licence, insurance, warranty and the questions that expose a thin scope.
Read the guide →Compare the options
Repair, replace or change the opening — decided on scope and five-year cost.
Read the guide →Browse the whole directory.
All service areas ·All WA service areas ·Cost guides ·Methodology