King County
Plumbers in King County, WA
Countywide, the median home was built in 1983 (Census ACS 2024 five-year estimates): 46 percent of King County's 1,003,284 housing units predate 1980, including 23 percent built before 1960, while 25 percent date from 1980 to 1999 and 30 percent from 2000 on.
Key facts
- Serving
- All of King County
- From our shop
- About 12 driving miles from Monroe
- Water
- Seattle Public Utilities, directly and through wholesale customers including Cascade Water Alliance members, Northshore Utility District, Woodinville Water District, Bothell and Duvall; Redmond adds its own wells. SPU water about 1.5 grains per gallon (roughly 26 mg/L, May 2026), soft; Redmond groundwater about 90 mg/L, moderately hard
- Estimates
- Free, upfront flat-rate pricing
- Emergencies
- 24/7 at (425) 845-3535
Plumbing across King County
Seattle Public Utilities supplies drinking water to 1.6 million people in the region, directly and through wholesale customers such as the Cascade Water Alliance (Bellevue, Kirkland, Redmond, Issaquah, Tukwila, Sammamish Plateau Water and Skyway Water and Sewer District), Northshore Utility District, Woodinville Water District and the cities of Bothell and Duvall. That Cedar and Tolt water is soft. Redmond is the local exception, pumping about 40 percent of its supply from wells at about 90 mg/L.
King County has over 85,000 septic systems, including nearly 40,000 in urban areas, many past their intended life span. Public Health Seattle & King County requires conventional gravity systems to be inspected every 3 years and pressure distribution, mound, sand filter and other advanced systems every 6 months, by a certified pumper or maintainer. Private well owners are responsible for monitoring their own water quality.
The rivers of the Snoqualmie-Skykomish watershed are the most flood-prone in King County. The lower Snoqualmie meanders north past Fall City, Carnation and Duvall, and the county calls flooding in the watershed common and expects it to increase with climate change. Near Lake Washington winters are milder: NOAA's 1991 to 2020 normals for Seattle's Sand Point station show about 25 freezing nights a year, against about 60 in Monroe.
Communities we serve
Bothell Kenmore Woodinville Duvall Carnation Kirkland Redmond Bellevue Shoreline Seattle
Near South Fork Tolt Reservoir, Cedar River Watershed, Marymoor Park, and everywhere in between.
Local know-how
Plumbing in King County: what to know.
Snoqualmie Valley flood prep
In flood-prone parts of Duvall and Carnation, FEMA suggests moving furnaces and other HVAC equipment to a higher floor, raising water heaters off the ground floor or switching to tankless, and setting heat pumps at least a foot above flood level. We install all three.
Septic-friendly water habits
Public Health Seattle & King County advises fixing leaky fixtures, running full dishwasher and laundry loads, spreading laundry over several days and never draining hot tubs into a septic system. Our leak detection and repair takes care of the first one.
Older homes, older pipes
Nearly half of King County homes, 46 percent, were built before 1980, and 23 percent before 1960. Homes that old may still have galvanized supply lines or cast-iron drains; a camera inspection and a repiping quote show where yours stand.
Water running right now?
Shut off the main water valve, turn off the water heater, and call us. Our emergency line answers 24/7.
Services
Our services in King County.
- 01Plumbing
Drain Cleaning
Slow sinks, backed-up showers and main-line clogs cleared with professional cable machines and hydro-jetting, with a camera inspection when we need to see what's causing it.
- — Kitchen, bathroom, laundry and floor drains cleared
- — Main sewer line cleaning from the cleanout
- — Hydro-jetting to scour grease, scale and roots off the pipe walls
Typical price: $250–$550 for a standard drain cleaning
Learn more - 02Plumbing
Water Heater Repair & Installation
Tank and tankless, gas and electric: same-day repairs, code-compliant replacements and upgrades, with the unit sized to your household.
- — Diagnosis and repair of thermostats, elements, gas valves, igniters and leaks
- — Tank water heater replacement, same day when possible
- — Tankless water heater installation and upgrades
Typical price: $2,200–$4,000 for a replacement, depending on the unit
Learn more - 03Plumbing
Leak Detection & Repair
Leaks found with electronic detection instead of guesswork, then fixed for good: pipes, fittings, valves, fixtures, slabs and burst lines.
- — Leak detection behind walls, under floors and in slabs
- — Pipe, fitting and valve repairs (copper, PEX, galvanized, CPVC)
- — Burst and frozen pipe repair
Typical price: $500–$1,100 for most leak repairs
Learn more - 04Plumbing
Whole-Home Repiping
Aging galvanized or polybutylene supply lines replaced with PEX or copper, with small access openings, a pressure test and a written warranty.
- — Whole-home PEX or copper repipe
- — Galvanized steel and polybutylene replacement
- — New shutoff valves at fixtures
- 05Plumbing
Sewer Line Service & Repair
Main sewer lines camera-inspected, cleaned of roots and grease, and repaired or replaced when the pipe itself has failed.
- — Sewer camera inspection with the footage explained
- — Main line cleaning and root cutting
- — Hydro-jetting for grease and root buildup
- 06Heating & cooling
HVAC Repair & Installation
Furnaces, heat pumps, air conditioners and ductless mini-splits repaired, maintained and installed, plus duct cleaning and repair.
- — Furnace repair, maintenance and replacement
- — Heat pump repair and installation
- — Air conditioner service and installation
Also available in King County: faucet, toilet and fixture installation, 24/7 emergency plumbing, and the Dam Good Defenders Club membership.
- Upfront, written flat-rate price before any work begins
- Dam Good Guarantee: if something we fixed isn't right, we come back and make it right, no charge.
- WA contractor license BEAVEPI741J3
Good questions
King County plumbing FAQ.
Don't see your question? Call or text (425) 845-3535. A real person answers, 24/7.
Who issues plumbing permits in King County?
It depends on the address. Public Health Seattle & King County issues plumbing and gas piping permits in Seattle, Clyde Hill and unincorporated King County. In any other King County city, including Bellevue, Kirkland and Redmond, permits come from that city's building department. If you're unsure which applies, the King County Parcel Viewer shows your jurisdiction.
Is tap water hard in King County?
Mostly no. Seattle Public Utilities water from the Cedar and Tolt rivers measured about 1.5 grains per gallon (roughly 26 mg/L) in May 2026, soft on the USGS scale, and it reaches Seattle and, through local utilities, Kenmore, Bothell, Woodinville, Duvall and the Eastside. Redmond's well water, about 90 mg/L, is moderately hard, and private well owners must monitor their own water quality.
Nearby areas we serve
Sources for local facts on this page
- https://www.seattle.gov/documents/Departments/SPU/AboutUs/Reports/Water%20Quality/SPU-Drinking-Water-Quality-Report_2025.pdf
- https://www.seattle.gov/documents/Departments/SPU/Services/Water/Analyses/SPU_Quarterly-Surface-Water-Analysis_05-20-2026.pdf
- https://www.seattle.gov/utilities/your-services/water/wholesale-water/customer-list
- https://cascadewater.org/about-cascade/members/
- https://www.nud.net/download/74/water-quality-reports/5025/2026-water-quality-report.pdf
- https://redmond.gov/DocumentCenter/View/28402/2026-Water-Quality-Report
- https://www.redmond.gov/FAQ.aspx?QID=175
- https://kingcounty.gov/en/dept/dph/health-safety/environmental-health/on-site-sewage-systems
- https://kingcounty.gov/en/dept/dph/health-safety/environmental-health/on-site-sewage-systems/maintaining-your-system/inspections
- https://kingcounty.gov/en/dept/dph/health-safety/environmental-health/on-site-sewage-systems/maintaining-your-system/about
- https://kingcounty.gov/en/dept/dph/health-safety/environmental-health/healthy-water-air-soil/drinking-water/water-quality/info-on-your-water-quality
- https://kingcounty.gov/en/dept/dnrp/nature-recreation/environment-ecology-conservation/flood-services/flooding-in-king-county-watersheds/snoqualmie-south-fork-skykomish-watershed
- https://kingcounty.gov/en/dept/dph/health-safety/environmental-health/plumbing-gas-piping/applications-and-permits
- https://www.fema.gov/sites/default/files/documents/fema_protect-your-home-from-flooding-brochure_2020.pdf
- https://www.ncei.noaa.gov/access/services/data/v1?dataset=normals-annualseasonal-1991-2020&stations=USC00455525,USW00024222,USW00094290&format=json
- https://www.kirklandwa.gov/files/sharedassets/public/v/1/public-works/kirkland-water-quality-report-2026.pdf
- https://en.wikipedia.org/wiki/Redmond,_Washington
- https://censusreporter.org/profiles/05000US53033/
- https://www.usgs.gov/special-topics/water-science-school/science/hardness-water
Plumbing problem in King County? Let's fix it right.
Free estimates, upfront flat-rate pricing, and a 24/7 emergency line at (425) 845-3535.