Sewer and side sewers
Sewer Repair and Side Sewer Replacement in Bothell, WA
Camera inspection, spot repair, trenchless lining and full replacement across 98011, 98012 and 98021. Permit pulled from the City of Bothell public works director before anyone digs, and inspected before backfill.
Your side sewer, the buried lateral running from your house to the public main, is private plumbing and the property owner is responsible for it. Northshore Utility District states that sewer piping on private property is an extension of the customer plumbing system. Repair runs roughly 70 to 360 dollars per linear foot and full replacement starts around 4,300 dollars. Any side sewer work in Bothell requires a permit from the public works director under BMC 18.03.340, and it is unlawful to backfill without inspection.
The rule nobody in Bothell explains
Who owns the side sewer at your house
This is the single most misunderstood thing in Bothell plumbing, and it decides who pays for a five figure repair.
The water side. Your district owns the meter and everything upstream of it. From the meter to your house, the pipe is yours.
The sewer side. Your side sewer is private plumbing from the property line to the residence. Silver Lake Water and Sewer District states it exactly that way. Northshore Utility District is equally direct: sewer piping located on private property is considered an extension of the customer plumbing system and is the responsibility of property owners, and district personnel are not authorized or licensed to make repairs on private plumbing systems. King County, which treats the wastewater for this whole area at the Brightwater plant on SR 9 in Woodinville, says the same. Side sewers need maintenance and the property owner is responsible for it.
One structural quirk worth knowing. Washington deleted the Uniform Plumbing Code entire building sewer chapter, Chapter 7 Part II, from the state code. That is why side sewer rules in Bothell come from the city and your district rather than from the state plumbing code, and it is why the rules genuinely differ street by street here.
Not optional
The Bothell permit rules for side sewer work
These are not our rules, they are municipal code, and a contractor who offers to skip them is exposing you rather than themselves.
- BMC 18.03.340. It is unlawful for any person to make an opening in any public sewer, or to connect or disconnect any private sewer or side sewer, or to lay, repair, alter or construct any sewer to be connected to a public sewer, without first obtaining a sewer permit from the public works director.
- BMC 18.03.370. It is unlawful to cover or backfill a side sewer without inspection and approval by the public works director. Twenty four hours notice is required and the permit must be on site.
- BMC 18.04. Storm drainage side sewers require their own separate permit. Sanitary and storm are not one permit.
- 811 locate before excavation. Public complaint records in this market include a crew that failed to call 811 or perform a utility locate before excavating and cut the grinder pump wires. That becomes the homeowner problem to unwind.
Outside city limits, in Bothell East, Bothell West and unincorporated Snohomish County, permits come from Snohomish County Planning and Development Services instead, whose published guidance is that any work performed on the water supply or drainage systems requires a permit.
Diagnosis
What is actually wrong with the line, and what each thing costs to fix
Sewer work is where this trade does its worst financial damage, because the diagnosis and the sale happen in the same visit. So here is the honest map.
| What the camera shows | What it means | Right repair |
|---|---|---|
| Root intrusion at a joint | Roots have found a gap. Very common in Bothell clay laterals near bigleaf maple and cottonwood. | Cut and jet, then decide on the joint. Not automatically a replacement. |
| Offset joint | Two sections no longer line up, usually from settlement. | Spot repair, or a liner across that section. |
| Belly | A dip holding standing water that never fully clears. | Spot excavation and re-bedding. Lining does not fix a belly. |
| Longitudinal crack | Pipe is failing structurally but is still round. | Cured in place liner is often ideal here. |
| Collapse | Pipe is no longer round. Nothing passes. | Genuine replacement, by excavation or pipe bursting. |
| Nothing structural | Grease or debris only. | Jetting. Some five figure quotes get written on lines that need exactly this. |
What it costs
Sewer repair prices in Bothell
| Job | Typical range |
|---|---|
| Sewer camera inspectionYou keep the recording | 290 dollars and up |
| Main sewer line clog clearingSeattle average 806 dollars | 350 to 1,270 dollars |
| Hydro jetting | 500 to 860 dollars |
| Tree root removal | 140 to 1,450 dollars |
| Sewer line repairPermit roughly 280 dollars | 70 to 360 dollars per linear foot |
| Full sewer line replacementPermit roughly 375 dollars | 4,300 dollars and up |
Why we push second opinions on this specific service
Because the public record in this market is ugly. Documented complaints against large plumbing companies operating around Bothell include a septic quote of 20,000 dollars a customer described as a 400 percent markup, where a competitor quoted 4,800 dollars, and a job charged at 7,735 dollars where a different contractor did the proper work for 5,183.51 dollars. In another, a homeowner was quoted approximately 42,000 dollars for a whole house repipe, work actually began, and on day three the real fault turned out to be a failed heating element in the water heater.
So our policy is simple. If you hold a written sewer quote of 5,000 dollars or more from another licensed contractor, we will give you a second opinion free. We camera the line ourselves and you get the footage. If the first quote was right, we will tell you it was right, and that happens, and it should.
Trenchless
Lining and pipe bursting, and when they are not the answer
Trenchless gets marketed as always better. It is not always better, it is better in specific conditions.
- Cured in place lining pulls a resin sleeve through the existing pipe and cures it into a new pipe inside the old one. Ideal for cracked but still round pipe, and for lines running under a driveway, mature garden or finished area you do not want opened. It reduces internal diameter slightly and it will not correct a belly.
- Pipe bursting pulls a new pipe through while fracturing the old one outward. Good for collapsed lines and for upsizing. It needs access pits at each end and is unsuitable where other utilities sit tight against the line, which is exactly why the 811 locate matters.
- Open cut excavation is still right for short runs, shallow lines, bellies, and anywhere the connection at the main needs rebuilding. It is often cheaper than trenchless on a short lateral, and anyone refusing to price it is not giving you options.
Unincorporated Snohomish County
On septic? A deadline lands on 1 November 2026
If you are in Bothell East, Bothell West or anywhere in unincorporated Snohomish County around 98012 and 98021, and you are thinking about selling in the next couple of years, this affects you. Snohomish County has roughly 84,000 private septic systems and about 2,785 septic properties change hands every year.
- From 1 November 2026, every septic system must be inspected by a certified professional before a property is sold, with the tank pumped if needed.
- The inspection may be done up to one year before closing, and reports are valid 12 months.
- Application review takes up to 10 days.
- Systems installed within 12 months of sale are exempt.
- The fee is 245 dollars for 2026 to 2027, rising to 255 dollars for 2027 to 2028.
This implements WAC 246-272A-0270, which becomes mandatory statewide on 1 February 2027. If you are listing in spring 2027, start this in autumn 2026. A failed inspection ten days before closing kills a deal, and the repair queue will get long once the rule takes effect countywide.
Straight answers
Side sewer questions Bothell homeowners ask
Who is responsible for the sewer line in Bothell, the city or me?
You are, from the property line to the house. Northshore Utility District states that sewer piping on private property is an extension of the customer plumbing system and the property owner responsibility, and that district personnel are not authorized or licensed to repair private plumbing. Silver Lake puts the water break at the meter and the sewer break at the property line. King County says the same about side sewer maintenance.
How much does sewer line repair cost in Bothell?
Repair runs roughly 70 to 360 dollars per linear foot, with permits around 280 dollars for a repair and 375 for a replacement. Full replacement starts around 4,300 dollars and climbs steeply with depth and length. Camera inspection is 290 dollars and up. Get a second opinion on anything over 5,000, and we will give you one free.
Do I need a permit to repair my side sewer in Bothell?
Yes. BMC 18.03.340 makes it unlawful to lay, repair, alter or construct any sewer connected to the public sewer without a sewer permit from the public works director. BMC 18.03.370 makes it unlawful to backfill without inspection and approval, with 24 hours notice required and the permit on site. Storm drainage side sewers need a separate permit under BMC 18.04. Northshore Utility District issues sewer repair permits at no charge.
Can I get the layout of my side sewer without paying for a locate?
Possibly. Silver Lake Water and Sewer District will provide As-Built drawings of your side sewer on request. Ask your district before approving a locate or camera charge, because the drawing may already show where the line runs and where the cleanout sits.
Is trenchless always better than digging?
No. Lining is ideal for cracked but still round pipe and for lines under driveways or mature landscaping, but it will not correct a belly. Pipe bursting suits collapsed lines and upsizing but needs access pits and clear separation from other utilities. Open cut is often cheaper on a short, shallow lateral, and any contractor refusing to price it is not giving you options.
How do I know if I actually need a full sewer replacement?
You should see camera footage of the defect, its location in feet from the cleanout, and its depth. Root intrusion, an offset joint, a belly and a crack are four different repairs. Genuine collapse, the one case that truly requires replacement, is maybe one in ten. If those three pieces of evidence are not offered, you are being sold rather than diagnosed.
My sewer keeps backing up every wet season. Why?
Roots chase moisture, so a marginal line that coped through August frequently fails in November when Bothell averages 8.3 inches of rain. It usually means the line is being reopened rather than cleaned, and that a joint is intruded. A camera inspection tells you whether that joint is merely intruded, which is maintenance, or failed, which is repair.
Do you handle sewer work in unincorporated Snohomish County?
Yes, including Bothell East, Bothell West, Maltby and Clearview. Permits out there come from Snohomish County Planning and Development Services rather than the City of Bothell. Note also the new pre sale septic inspection requirement taking effect on 1 November 2026.
Related
Other things we fix in Bothell
Drain Cleaning & Clogged Drains
Cleared through a cleanout, then cameraed so you see the line is actually clear.
24 Hour Emergency Plumber
Burst pipes, sewer backups and no-water calls, answered around the clock across 98011, 98012 and 98021.
Leak Detection & Pipe Repair
Pinhole leaks, crawlspace leaks, and the free meter test you can run yourself first.
Water Pressure, PRV & Expansion Tanks
The Alderwood pressure reduction project, and why your relief valve drips.
Repiping, Polybutylene & Galvanized
Canyon Park poly-B and Maywood galvanized, diagnosed honestly before anyone sells you a whole house.
Water Heater Repair & Replacement
Tank, tankless and heat pump. Plus the PSE and Snohomish PUD rebate deadlines nobody explains.
Full detail in our guide on who owns the side sewer in Bothell, and on the Snohomish County septic rule.
Service area
- 98011
- 98012
- 98021
- Kenmore
- Woodinville
- Mill Creek
- Brier
- Lynnwood
- Bothell East
- Bothell West
Sewage backing up inside?
Stop running water, call your district, then call us. We cover Bothell, Kenmore, Woodinville, Mill Creek, Brier and Lynnwood.