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How do plumbers in Washington get more customers from Google and AI search?
Short answer: Plumbers in Washington get found online with a website that shows their license number, names the towns they serve such as Seattle, Spokane and Tacoma, and collects real local reviews. Licensing runs through the Washington State Department of Labor & Industries (L&I). The state had 2,199 businesses with staff in this Census category in 2022.
- Licensing body: Washington State Department of Labor & Industries (L&I).
- Contractors must include their L&I registration number in advertising, bids, estimates, business cards and online ads.
- 2,199 businesses with staff in 2022, 16th of 50 states; 73% have fewer than 10 staff.
- Largest cities: Seattle, Spokane and Tacoma.
- Common words in local searches: “residential”, “reviews” and “emergency”.
- Coldest month December (about 31°F), warmest July (about 65°F), statewide average.
Do plumbers need a license in Washington?
In Washington, the licensing body for this work is Washington State Department of Labor & Industries (L&I).
License or registration types named by the state: Plumbing Contractor license; Journey Level Plumber certificate; Specialty Plumber certificate.
- Only L&I-certified plumbers may do plumbing work on property they do not own.
- Plumbing contractors need a $6,000 bond (or assigned account) and general liability insurance of $250,000 combined limit.
- A plumbing contractor must have a designated certified plumber. The license runs 24 months.
Homeowners can check a license on the state lookup page. Put your number where they will look for it.
Contractor registration in Washington sits with Washington State Department of Labor & Industries (L&I). All construction contractors must register with L&I before they bid, advertise or work. Bond is $30,000 for general and $15,000 for specialty. Liability insurance is $200,000 public plus $50,000 property damage, or $250,000 combined.
License numbers in ads and on websites
Contractors must include their L&I registration number in advertising, bids, estimates, business cards and online ads. Using a false or expired registration number to buy a required ad is a gross misdemeanor (RCW 18.27.020).
What do homeowners in Washington’s biggest cities search for?
Google autocomplete for plumber searches in each city (job-seeker searches removed):
Seattle
- plumber seattle wa
- plumbers seattle residential
- seattle plumber hourly rate
- seattle plumber recommendations
- seattle plumbers and pipefitters insurance
- seattle plumbers reviews
Spokane
- plumber spokane south hill
- plumber spokane valley
- plumber spokane valley wa
- plumber spokane wa
- plumbers spokane residential
- plumbers spokane valley
- plumbers spokane valley residential
- plumbers spokane wa
Tacoma
- best plumber tacoma
- emergency plumber tacoma
- north tacoma plumber
- plumber tacoma wa
- plumbers tacoma residential
- plumbing tacoma wa
- tacoma emergency plumber
- tacoma plumbers reviews
Vancouver
- plumber vancouver downtown
- plumber vancouver price
- plumber vancouver residential
- plumber vancouver wa
- plumber vancouver washington
- plumbers vancouver wa
- vancouver plumber emergency
- vancouver plumber hourly rate
Bellevue
- bellevue plumber reviews
- plumber bellevue hill
- plumber bellevue ohio
- plumber bellevue wa
- plumbers bellevue idaho
- plumbers bellevue ohio
Across these cities, the words that come up most are “residential”, “reviews”, “emergency” and “best”.
Source: Google autocomplete suggestions, checked November 8, 2026. Suggestions change over time.
What does a year of plumber work look like in Washington?
Publish each seasonal page four to six weeks ahead.
| Month | Avg temp | Jobs to plan for (our suggestion) |
|---|---|---|
| January | 32°F | frozen and burst pipes, water heater failures |
| February | 35°F | water heater replacements, drain clearing after the thaw |
| March | 40°F | water heater replacements, drain clearing after the thaw |
| April | 45°F | water heater replacements, drain clearing after the thaw |
| May | 53°F | water heater replacements, drain clearing after the thaw |
| June | 58°F | remodel plumbing, outdoor spigots, sewer line inspections |
| July | 65°F | remodel plumbing, outdoor spigots, sewer line inspections |
| August | 65°F | remodel plumbing, outdoor spigots, sewer line inspections |
| September | 58°F | remodel plumbing, outdoor spigots, sewer line inspections |
| October | 47°F | water heater replacements, drain clearing after the thaw |
| November | 37°F | water heater replacements, drain clearing after the thaw |
| December | 31°F | frozen and burst pipes, water heater failures |
Temperatures: NOAA NCEI nClimDiv statewide data. Job column: our planning suggestion, not survey data.
How many plumbing contractors compete in Washington’s main cities?
| City | County | Businesses with staff | Residents per business |
|---|---|---|---|
| Seattle | King County | 456 | 4,981 |
| Spokane | Spokane County | 179 | 3,081 |
| Tacoma | Pierce County | 263 | 3,531 |
| Vancouver | Clark County | 199 | 2,619 |
| Bellevue | King County | 456 | 4,981 |
Competition is tightest around Vancouver (Clark County), with one business for every 2,619 residents, and loosest around Seattle, at one per 4,981.
Source: US Census Bureau, County Business Patterns 2022 and County Population Estimates 2023. Counts businesses with paid employees only.
How many plumbing contractors are in Washington?
The Census Bureau counted 2,199 businesses with employees in Washington in 2022, in the category “Plumbing, heating and air-conditioning contractors”. That ranks Washington 16th of 50 states, a mid-sized market, and 2% of the US total. 73% of them have fewer than 10 staff, and 341 have 20 or more.
Together they employ 31,391 people, with an average yearly payroll of $1,240,015 per business. The three busiest counties hold 47% of them, so the work is spread across the state.
With 7,812,880 residents (Census, July 2023), that is one business for every 3,553 people, against 3,051 nationally: more residents per business than the US average, so each business has more homes to serve.
Washington next to its neighbors
| State | Businesses | Residents per business | Under 10 staff |
|---|---|---|---|
| Washington | 2,199 | 3,553 | 73% |
| Idaho | 871 | 2,256 | 78% |
| Oregon | 1,324 | 3,197 | 77% |
Counties with the most plumbing contractors
| County | Businesses | Residents per business |
|---|---|---|
| King County | 456 | 4,981 |
| Snohomish County | 318 | 2,656 |
| Pierce County | 263 | 3,531 |
| Clark County | 199 | 2,619 |
| Spokane County | 179 | 3,081 |
| Kitsap County | 88 | 3,155 |
| Thurston County | 75 | 3,987 |
| Yakima County | 71 | 3,615 |
| Benton County | 66 | 3,261 |
| Whatcom County | 60 | 3,865 |
34 of Washington’s counties have at least one. Source: US Census Bureau, County Business Patterns 2022.
How big are they?
Businesses by number of employees, 2022: 1,209 with 1-4 staff, 390 with 5-9 staff, 256 with 10-19 staff, 229 with 20-49 staff, 112 with 50+ staff.
Where Washington is growing
New homes and new owners bring new work. Washington's population changed +1.1% from July 2020 to July 2023. The fastest-growing counties with 50,000 or more people:
- Lewis County: 86,154 people, +4.4% since 2020, 22 plumbing contractors
- Benton County: 215,219 people, +3.8% since 2020, 66 plumbing contractors
- Mason County: 68,389 people, +3.6% since 2020, 13 plumbing contractors
- Grant County: 102,678 people, +3.3% since 2020, 19 plumbing contractors
- Clark County: 521,150 people, +3.1% since 2020, 199 plumbing contractors
Source: US Census Bureau, County Population Estimates, Vintage 2023.
Which code applies in Washington?
For this trade, Washington uses: state plumbing code. Washington state plumbing code applies; ICC chart shows only limited IPC use.
What should a Washington plumber website show?
- Your license number in the footer of every page. Washington requires it in advertising for at least some trades.
- A service area list that names real counties and towns, for example King County, Snohomish County and Pierce County.
- Seasonal pages published before May, so they are found when demand starts.
- Real reviews from local jobs, with the town named, and photos of your own work.
Washington questions
Who licenses plumbers in Washington?
Washington State Department of Labor & Industries (L&I). Only L&I-certified plumbers may do plumbing work on property they do not own. Plumbing contractors need a $6,000 bond (or assigned account) and general liability insurance of $250,000 combined limit. A plumbing contractor must have a designated certified plumber. The license runs 24 months.
How many plumbing contractors are there in Washington?
The US Census Bureau counted 2,199 businesses with employees in Washington in 2022 in the category Plumbing, heating and air-conditioning contractors, and 73% of them have fewer than 10 staff.
Which county in Washington has the most plumbing contractors?
King County, with 456 businesses with employees in 2022 (Census County Business Patterns).
Do I need my license number on my website in Washington?
Contractors must include their L&I registration number in advertising, bids, estimates, business cards and online ads. Using a false or expired registration number to buy a required ad is a gross misdemeanor (RCW 18.27.020).
What do people in Seattle search for when they need a plumber?
Google autocomplete for Seattle shows searches such as “plumber seattle wa”, “plumbers seattle residential”, “seattle plumber hourly rate” and “seattle plumber recommendations”.
When is the busiest season for plumbers in Washington?
Washington’s statewide average runs from about 31°F in December to about 65°F in July (NOAA, 1991 to 2020).
Sources
- US Census Bureau, County Business Patterns 2022 (state and county files)
- US Census Bureau, City, Town and County Population Estimates, Vintage 2023
- NOAA NCEI, nClimDiv statewide temperature and degree days, 1991 to 2020
- Google autocomplete suggestions for the cities named, checked November 2026
- https://lni.wa.gov/licensing-permits/plumbing/plumber-certification/
- https://lni.wa.gov/licensing-permits/plumbing/licensed-plumbing-contractor/licensing-requirements
- https://lni.wa.gov/licensing-permits/contractors/register-as-a-contractor/
- https://app.leg.wa.gov/rcw/default.aspx?cite=18.27.020
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