Owner-operated drain & sewer service in Ballard, Seattle
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Phones 8 AM – 8 PM daily · Online booking 24/7
5608 17th Ave NW, Suite 2025, Seattle, WA 98107 · WA #DRAINDA756MA

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Main Drain Cleaning in Seattle

When the tub, the toilet and the downstairs sink slow down together, the shared drain inside the house is narrowing. We clear it from an indoor cleanout, prove it flows, and check whether the problem keeps going out into the side sewer.

Call (206) 590-1455 Book online, any hour

Owner answers 8 AM to 8 PM, seven days · Book online 24/7

Open floor cleanout and drain pipes in a basement during a drain call
Field photo · Basement cleanout opened for access

The short answer

Main drain cleaning clears the building drain, the shared pipe inside the house where branch lines join before it leaves the foundation. When it narrows, several fixtures slow together, often on the lowest floor first. We clear it from an indoor cleanout, flow-test it and check whether the problem continues into the side sewer. Seattle price: $200–$600 flat.

$200–$600

Building drain cleared, flat price

Inside first

Cleared from the indoor cleanout

$0 trip fee

Same rate evenings & weekends

5.0

Google rating from 100+ reviews

What main drain cleaning covers, and what it costs

This page is for the shared drain inside the building. A blockage out in the yard or under the street is a different line and a different job.

We open the indoor cleanout, clear the building drain with a cable sized for it, and run water through every affected fixture to prove it. If the restriction continues past the foundation, we say so and price the side sewer separately.

In older houses the problem is often the pipe wall, not something stuck in it. If the cable comes back with rust flakes and scale, the next step is a camera and possibly cast iron descaling.

Price
$200–$600 flat; jetting $500–$700
Line
The building drain, where branch lines join inside the house
Access
Indoor cleanout, or a pulled toilet when there is none
Camera
When the cause is unclear or the line is cast iron
Hours
Phones 8 AM to 8 PM daily; online booking any hour

Branch line, main drain or main sewer line?

Three different pipes, three different jobs. The pattern of what is slow tells us which one before we arrive.

What you notice Which line The right service
One sink, tub or toilet is slow; nothing else is Which lineThat fixture’s branch line The right service Clogged drain service
Several fixtures inside slow together; nothing outside Which lineThe building drain The right serviceMain drain cleaning, this page
Lowest-floor shower or floor drain gurgles when upstairs drains Which lineThe building drain, near its low end The right serviceMain drain cleaning, with a camera if it repeats
Water at the basement floor drain or a yard cleanout Which lineThe side sewer outside The right service Main sewer line cleaning
Everything backs up, worse during rain Which lineThe side sewer, sometimes the public main The right serviceMain sewer line cleaning and a call to SPU

Still not sure? The free drain diagnostic walks through it.

What narrows a Seattle building drain

Inside the house the causes are different from out in the yard. These are the ones we find most.

Drain cable running into a laundry standpipe behind a washer
Field photo · Cable into a laundry line

  1. 01

    Scale in old cast iron

    Many older homes still have cast iron building drains. Cast iron rusts from the inside and builds a rough scale that narrows the pipe and grabs debris, which is why it slows down even when nothing is stuck in it.

  2. 02

    Lint, soap and grease where branches meet

    Laundry lint, soap and kitchen grease travel down separate branches and meet in the building drain. That junction is where they settle and harden.

  3. 03

    Aging pipe in general

    Seattle Public Utilities lists structural deterioration due to aging pipes among the causes of side sewer damage. The building drain inside the house is usually the same age.

    Source: SPU, Side Sewer Defects & Issues

  4. 04

    Caustic cleaners in old lines

    An N.C. Cooperative Extension urban forester notes that highly caustic drain cleaners can damage older sewer pipes. In a scaled cast iron drain they mostly sit in the low spots.

    Source: N.C. Cooperative Extension

Inside the building drain

Indoor access, the right cable and a camera when the cause is not obvious.

Indoor cleanout first

Clearing from inside reaches the building drain directly and keeps the work off your lawn.

Sized to the pipe

A building drain is larger than a sink branch; the cable and head are matched to it.

Camera when it repeats

If the drain slows again within months, the camera shows whether it is scale, a sag or the side sewer.

Heavy-duty drum drain cleaning machine set up on a basement floor
A drum machine set up on a basement floor.
Toilet removed from a tiled bathroom floor, exposing the corroded closet flange and drain opening
Toilet pulled to reach the drain at the flange.
Hand lifting a floor drain grate to show standing water in the drain below
Floor drain grate lifted over standing water.
Pipe inspection camera head with LED lights and a swiveling lens
A pipe camera head, with lights on both sides of the lens.

Main drain cleaning or main sewer line cleaning?

The names sound alike and some companies use them interchangeably. They are different pipes, and the difference changes the price.

What to check Main sewer line cleaning Main drain cleaning
Which pipe The side sewer, foundation to city main The building drain inside the house
Usual access Outdoor cleanout Indoor cleanout or a pulled toilet
Typical cause Roots at joints, grease, offsets Scale in cast iron, lint, soap and grease
Who owns it The owner, all the way to the main The owner
Seattle price $200–$600; $500–$700 jetted $200–$600; $500–$700 jetted

How a main drain call works

One visit for most building drain clogs, with a camera when the cause is not obvious.

  1. 3–5 min

    The call

    Which fixtures are slow, which floor, and whether anything shows up outside.

  2. Same day

    Arrival window

    A window, not a whole day, when the schedule allows.

  3. ~10 min

    Flat price

    Indoor access found, floors covered, one price approved first.

  4. 30 min–2 hrs

    Clear the drain

    Cable sized to the building drain, from the closest access.

  5. ~15 min

    Prove it

    Every affected fixture run; camera if the line is cast iron or it repeats.

Several drains slow at once?

Book a slot online any hour, or call and the owner answers 8 AM to 8 PM. Same flat price evenings and weekends.

Book main drain cleaning

Water coming up a floor drain? Call (206) 590-1455

How much does main drain cleaning cost in Seattle?

A flat price for the shared drain inside the house, cleared from inside.

Our flat price

$200–$600

The building drain, cleared from inside

  • Indoor cleanout or a pulled toilet
  • Cable sized to the building drain
  • Every affected fixture run
  • Camera when it repeats or is cast iron

Main drain cleaning costs $200 to $600 in Seattle, flat, for the building drain inside the house. We clear it from the indoor cleanout, or a pulled toilet when there is none, and run every affected fixture to prove it. If the line needs jetting, that is $500 to $700.

Seattle average
Angi’s 2026 Seattle data puts drain cleaning at $210–$536, averaging $373. Angi: Seattle drain cleaning cost
Never added
A trip fee, an hourly meter, or an evening or weekend surcharge
Past the foundation
If the restriction continues into the side sewer, we say so and price it separately
Scaled cast iron
Cast iron descaling from $800, bid after the camera

Building drain prices and what usually comes next

Flat Seattle prices for clearing the building drain and fixing why it narrowed.

Who owns which pipe in Seattle

Inside or outside the foundation, the drain is the owner’s responsibility. Here is where that ends.

  • Inside the house: yours

    The building drain and every branch line inside the house belong to the property owner.

  • Outside to the main: still yours

    Seattle Public Utilities says the owner’s side sewer runs until it connects to the public sewer main, including under the sidewalk and street. SPU: Your Side Sewer

  • The public main: SPU’s

    For a blockage in the public main or the city connection, call SPU at (206) 386-1800, 24 hours a day. SPU: Side Sewer Backups

  • Check who you hire

    Washington L&I lists every registered contractor. Verify a contractor; ours is #DRAINDA756MA.

Drain cleaning near you

Same flat prices across Seattle, the north end and the Eastside. See all service areas.

Main drain cleaning FAQ

What the main drain is, how it differs from the sewer line, and what it costs. More in the Seattle drain & sewer FAQ.

Still have a question?

Shane answers the phone himself, 8 AM to 8 PM, seven days a week.

Call (206) 590-1455 Send a question

What is the main drain in a house?

The main drain, or building drain, is the shared pipe inside the house where the branch lines from sinks, tubs, toilets and the laundry join before the pipe leaves the foundation. Outside the foundation it becomes the side sewer, which runs to the city main.

How much does main drain cleaning cost in Seattle?

Ours runs $200–$600, flat, from an indoor cleanout. If the line is coated in grease or scale and needs hydro jetting, that runs $500–$700. There is no trip fee, and evenings and weekends cost the same.

What is the difference between main drain cleaning and main sewer line cleaning?

Main drain cleaning clears the building drain inside the house. Main sewer line cleaning clears the side sewer outside, from the foundation to the city main. Several fixtures slow inside with nothing outside points to the building drain; water at the basement floor drain or a yard cleanout points to the side sewer.

What are the signs of a clogged main drain?

Several fixtures inside the house slowing together, usually the lowest ones first, a toilet that gurgles when a nearby tub or sink drains, and water appearing in a lower-level shower or floor drain.

Why do older Seattle houses have main drain problems?

Many older houses have cast iron building drains. Cast iron rusts from the inside and builds a rough scale that narrows the pipe and catches debris, so the line slows down even when nothing is stuck in it. A camera shows whether scale is the cause.

Can a main drain be cleaned without a cleanout?

Often, through a removed toilet or another access point. We tell you before pricing which access we would use, and whether adding a cleanout would make future cleanings easier.

Do you replace the main drain if it is damaged?

No. We clean, jet and descale drain lines and run cameras. If the pipe has failed, we refer the repair with the footage, so you know exactly which section needs it.

Sources and Seattle references

Ownership rules and outside guidance on this page come from these public sources. Our prices are flat Seattle rates for standard service, reviewed October 2026.

Several drains slow at once? Tell us the pattern.

Which fixtures, which floor and whether anything shows up outside tells us building drain or side sewer before we arrive.

  • Which fixtures are slow
  • Which floor they are on
  • Any water at a floor drain
  • Where the cleanout is, if you know
Book online Call (206) 590-1455

The Drain Authority

5608 17th Ave NW, Suite 2025
Seattle, WA 98107
Phone
(206) 590-1455
Email
info@drainauthority.pro
Hours
Daily, 8 AM to 8 PM
Booking
Online, 24/7
License
WA contractor #DRAINDA756MA
Google profile & directions Free drain diagnostic