Snohomish County
Plumber in Mountlake Terrace, WA
Mountlake Terrace has some of the oldest housing in south Snohomish County: ACS 2024 5-year estimates (2020 to 2024) put the median year built at 1973, with 23% of homes built before 1960, 60% before 1980 and 16% since 2000.
Key facts
- Serving
- Mountlake Terrace, WA
- ZIP codes
- 98043
- From our shop
- About 20 driving miles from Monroe
- Water
- City of Mountlake Terrace, which buys its water from Alderwood Water & Wastewater District. Soft: 12.5 ppm (mg/L) average total hardness in 2025, range 10.2 to 15.8
- Estimates
- Free, upfront flat-rate pricing
- Emergencies
- 24/7 at (425) 845-3535
Plumbing in Mountlake Terrace
Mountlake Terrace was built fast. Developers bought a disused World War II landing field in 1949 and began the first 250 homes that June: two-bedroom cinderblock houses on a 20-by-30-foot plan, built assembly-line style for returning veterans. By 1954 about 5,000 people lived there, and the early water mains and septic tanks were prone to failure. Within a few years of incorporating that year, the new city began a permanent water and sewer system.
Growth kept coming: the population doubled between 1950 and 1960 and nearly doubled again to more than 16,000 by 1970, and the 1970s added many apartments and condominiums. In 1958 the city joined the Edmonds and Ronald sewer districts in a 'Little Metro' to share treatment facilities. Today a 2.5-million-gallon tank at Jack Block Park holds reserve water for firefighting and boosts pressure.
Neighborhoods we serve
Town Center Cascade View Cedar Terrace Gateway Lake Ballinger Melody Hill
Near Ballinger Park and Lake Ballinger, Terrace Creek Park, Veterans Memorial Park, and everywhere in between.
Local know-how
What's hard on plumbing in Mountlake Terrace.
Galvanized pipe in 1950s homes
Nearly a quarter of Mountlake Terrace homes were built before 1960, when galvanized steel supply pipe was common. Many early houses were later renovated and expanded, so plumbing may mix original and newer pipe. Beaver's repipes with PEX or copper at a flat rate.
Camera-check cast-iron drains
Six in ten Mountlake Terrace homes predate 1980, and houses built before the mid-1970s often have cast-iron drains. A camera inspection shows cracks, sags or roots in the drain and side sewer, so hydro-jetting or repair targets the real problem.
Backflow devices for sprinklers and tubs
Mountlake Terrace requires a backflow prevention device if you have lawn irrigation, a fire sprinkler system, a boiler or hydronic makeup line, or a pool, hot tub or pond tied directly to your water line. Each device needs an annual test by a registered tester.
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 Mountlake Terrace.
- 01Plumbing
Drain cleaning in Mountlake Terrace
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 heaters in Mountlake Terrace
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 repair in Mountlake Terrace
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
Repiping in Mountlake Terrace
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 lines in Mountlake Terrace
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 in Mountlake Terrace
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 Mountlake Terrace: 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
Mountlake Terrace plumbing FAQ.
Don't see your question? Call or text (425) 845-3535. A real person answers, 24/7.
Who handles water and sewer in Mountlake Terrace?
The city runs both. It buys Everett's Spada Lake water through Alderwood Water & Wastewater District and delivers it through 79 miles of distribution pipe; hardness averaged 12.5 ppm in 2025, which is soft. Most of the city's sewage is sent to the City of Edmonds for treatment, with overflow going to King County's Brightwater plant. For leaks, clogs or side sewer trouble at your house, call Beaver's.
Do Mountlake Terrace homes have polybutylene pipe?
Some may. About 24% of the city's homes were built from 1980 to 1999, and polybutylene supply pipe was installed from roughly 1978 to 1995. Homes built before 1960, 23% of the city, are more likely to have galvanized steel instead. Beaver's can identify what you have at the water heater or under a sink and quote a flat-rate PEX or copper repipe.
Nearby areas we serve
Plumbing problem in Mountlake Terrace? Let's fix it right.
Free estimates, upfront flat-rate pricing, and a 24/7 emergency line at (425) 845-3535.