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The Outside Wastewater Specialist — House to Tank or Main

Septic to Sewer Conversion in Spokane & North Idaho, Handled Start to Finish

New lateral. Connection at the main. Old tank retired per code. One crew does all of it.

Sewer finally reached your street — now what? Most homeowners get bounced between an excavator, a pumper, and the permit office. Steadfast owns the entire transition: we install the new sewer lateral, make the connection, and properly decommission your old septic tank. One crew, one permit package, one number to call. Serving Spokane, Spokane Valley, Liberty Lake, and communities across North Idaho.

Call (208) 889-9944 Get a Free Conversion Assessment

Get Your Free Conversion Assessment

We respond quickly

One Crew — Lateral to Decommission
Permits & Inspections Handled
Fixed-Price Quotes
Yard Restored When We’re Done
New Sewer Lateral Installation Connection Made at the Main Old Tank Decommissioned Per Code Permits Handled Dual Expertise: Septic + Sewer Fixed-Price Quotes Yard Restored

Licensed in Idaho & Washington · Factory-Certified

  • IDIdaho DEQComplex Installer · #15-11831
  • IDIdaho DEQLicensed Service Provider
  • WASpokane CountyMaster Installer
  • WASpokane CountyOperation & Maintenance
  • Certified Installer & O&M Specialist
  • Lowridge Certified Installer & O&M
  • Certified Installer
  • One Place
    Church    Official Septic Installation & Repair Specialist
Real Customers, Real Results

Don’t Take Our Word For It

Watch real homeowners tell you exactly what it’s like to work with Steadfast. No scripts, no actors, just the truth.

Twin Lakes Rathdrum Idaho septic tank replacement customer testimonial
Verified Customer
Septic Tank ReplacementTwin Lakes homeowner on the new tank
Hayden Idaho septic backup repair customer testimonial
Verified Customer
Septic Backup RepairHayden homeowner, backup fixed
Septic system replacement customer testimonial
Verified Customer
Full System ReplacementBacking up into the shower — now a new system
Septic installation customer testimonial
Verified Customer
Septic InstallationEmergency complications handled by experts
Pressure distribution septic install customer testimonial
Verified Customer
Pressure Distribution InstallHomeowner on the finished system
Septic repair customer testimonial
Verified Customer
Septic RepairHappy homeowner, in her own words
Verified Google Reviews

What Customers Say About Steadfast

Every review below is a verified Google review from Steadfast Septic’s own Google Business Profile — real homeowners and contractors, in their own words.

★★★★★

“Tyler came out today and went above and beyond to fix a problem that ended up being a lot more than what we discussed over the phone. We were able to get it fixed the same day! Tyler’s price was more than reasonable. He was kind and showed up early to the job! A+ review for this guy. If you have any issues I strongly suggest you use him.”

— Riley Sullivan · Verified Google review for Steadfast Septic

★★★★★

“Tyler is awesome, his vast knowledge of his work is very impressive. My husband and I needed a septic repair. I loved working with him, not only did he get the job done but he was very personable and walked us through the entire process. There was no pressure when he came to check out the system to go with him just pure honesty on the job that needed to be done. 10/10 job and would highly recommend, he is your go to guy for septic!!”

— Katarina Thurber · Verified Google review for Steadfast Septic

★★★★★

“Tyler is knowledgeable and responsive! helped us get up and running asap at what I feel was a fair price. All in all very happy with the job.”

— Mark Burman · Verified Google review for Steadfast Septic

★★★★★

“I emailed this company regarding a few questions/concerns about my septic system and promptly got a phone call. They scheduled over the phone and took some information about the system. I received confirmation texts and a heads up that they were on the way. Tyler was thorough and professional. Great experience as he was genuinely concerned about my issues at hand. Excellent service!”

— Josh Gray · Verified Google review for Steadfast Septic

★★★★★

“As a contractor you need reliability, communication and precision. Steadfast Septic has delivered and exceeded every expectation on every job I have had them on. Not only this but every time I have referred them I have gotten incredible feedback about them as well. This is our go to company for all our septic installations and repairs. Thank you for keeping our job sites moving Tyler!”

— Anton Ramsey · Verified Google review for Steadfast Septic

★★★★★

“The best , reliable, honest and prompt. What else could you want! If you need any septic services he is the guy!”

— Jerinne Audel · Verified Google review for Steadfast Septic

What Homeowners Say★★★★★

Verified Google reviews for our sister company, Lilly’s Septic Service in King County, WA — 450+ five-star reviews. Steadfast is that same operation, same crew leadership and same standards, brought to North Idaho and Spokane County.

L
Linda Sing
Local Guide · 18 reviews
★★★★★

Our septic system was acting up, and after two disappointing and frustrating experiences with other companies, we were desperate for someone reliable, knowledgeable and good at troubleshooting. This team was a game-changer! They responded quickly, knew their stuff, and pinpointed the problem in just 30 minutes. They gave me a clear cost estimate on the spot and had a crew out within a week to fix it. Our system’s back to normal, and the relief is unreal (no pun intended!). Huge thanks to Darren, Josh, Jeremy, Tyler, and Grace for their professionalism and care. You guys deserve 10 stars out of 5!

Repair & Troubleshooting
E
Elena Jouhari
Local Guide · 32 reviews
★★★★★

If you need a septic company, this is the one you need. I cannot recommend them highly enough!!! Tyler took my call in the morning, put me on their schedule for the same day, communicated thoroughly through the process, did some research and troubleshooting and by 1pm he had our pump running again. Perfect manners, immaculate business ethics, highly professional, local through and through. I would give them 10 stars if I could! Literally, restored my faith in humanity today. Thank you!

Emergency Pump Failure
C
Craig H
2 reviews
★★★★★

We had an issue with our septic system drain-field over the weekend. On Sunday I left a msg on the phone for Lilly’s service. Monday morning I received a call and within an hour Josh and Tyler were at my door to assess the situation. They camera scoped the lines and explained the issue going on. They were very thorough and provided recommendations for correction. No pressure, no sales hype, just straight forward sharing of knowledge. I will be proceeding with Lilly’s to conduct the work needed. Good group, quick and responsive.

Drainfield Diagnosis
K
Katie Beck
5 reviews · 6 photos
★★★★★

True professionals! Darren and his team were extremely friendly and informative, answering our long list of questions pre-install, and orchestrating an extremely complex install project with multiple other vendors (plumber, electrician, tank manufacturer) over two days. It was impressive to watch, and we felt very well taken care of throughout what turned out to be a major process. I would hands-down recommend Lilly’s Septic Service to anyone needing a septic system installation or service.

Complex System Install
R
Ray Kneeland
8 reviews · 4 photos
★★★★★

Tyler showed up ahead of schedule and began assessing the issue with our septic system quickly. He took the time to determine the problem before just performing the requested pump out. He quickly replaced the float for the pump gave us great information for the future. Will use them again when we have an issue!!

Diagnosis Before Upsell
A
Andrew Knutzen
Local Guide · 25 reviews
★★★★★

Have used Lilly’s a couple times recently for septic inspections and repair on different properties in Maple Valley. Fast service. Can always get someone on the phone at the office. And when they make mistakes (don’t we all), they own up to them and fix it. I find that to be both rare and admirable. Will keep using them until they give me a reason not to!

Inspections & Repair
M
Megan Brehm
1 review
★★★★★

From my first call, I felt like Tyler really took the time to hear my concerns as a homeowner needing to replace a septic tank in failure. I could not have asked for a better experience - truly happy in my interactions with Lilly’s so far! Don’t have an estimate yet for the work so can’t speak to pricing but have been happy so far.

Tank Replacement
M
mark
3 reviews
★★★★★

I did a septic tank inspection and pumping and unfortunately the results were not good. However both guys did a great job, went to a lot of work to try to get it to pass and carefully explained everything and explained options and likely results. I really appreciated the job they did.

Inspection & Pumping

Ready to be our next success story?

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01Why Convert

Why Homeowners Switch from Septic to Sewer

Nobody converts for fun — there’s always a trigger. Whichever one brought you here, the math usually points the same direction: connect once, and stop thinking about your septic system forever.

Sewer Reached Your Street
The line is finally in front of your property. Connecting while crews, stubs, and hookup programs are fresh is almost always cheaper and simpler than connecting years later.
Your Septic Is on Borrowed Time
If your tank or drainfield is failing, you’re facing a major repair or full replacement anyway. When sewer is available, converting once often beats rebuilding a system you’ll still have to maintain.
No More Septic Upkeep
Routine pump-outs, drainfield worry, alarm panels, being careful about what goes down the drain — all of it goes away. City sewer is the closest thing to a set-and-forget utility.
Property Value & Easier Resale
Buyers, lenders, and inspectors all like city sewer. It’s one less system to inspect, disclose, and negotiate over when you sell — and one less surprise that can stall a closing.
County & City Requirements
Some jurisdictions require connection once sewer is available — especially when a septic system fails or a property changes use. We check the exact rules for your parcel as part of the assessment.
Reclaim Your Yard
Your drainfield has been quietly reserving a huge piece of your property. Decommission the system and that ground is yours again — for the shop, the garden, or the addition you’ve been putting off.
02The Conversion, Start to Finish

Watch Your Property Make the Switch

Scroll, and the conversion plays out below exactly the way we build it — the new lateral goes in, the flow reroutes to the main, and your old tank is retired for good. This is the entire job. One crew does every bit of it.

Scroll — the conversion plays as you go
3 FT 6 FT 9 FT STREET City Sewer Main Your Home Septic Tank TANK PUMPED DECOMMISSIONED PER CODE Drainfield INACTIVE LINE CAPPED PUMP-OUT WASTEWATER FLOWS: HOUSE → TANK → DRAINFIELD WASTEWATER FLOWS: HOUSE → CITY SEWER MAIN
Today: everything from your house flows to a septic tank and drainfield buried in your yard — a system you own, maintain, and eventually replace. We excavate one precise trench and install a new sewer lateral — properly bedded and sloped — from your foundation out to the main. The connection is made and flow reroutes to the main. Your old line is capped, and the drainfield goes quiet for good. The old tank is pumped, crushed, and filled per code — documented, inspected, and officially retired. Your yard goes back to being just a yard.
03What’s Included

One Specialist. The Whole Job.

A conversion is really two trades in one project — sewer work on one end, septic work on the other. Most companies can only sell you their half, which quietly makes you the general contractor. Steadfast does the entire transition under one roof.

ExcavatorDigs the trench, then leaves
PumperEmpties the tank, then leaves
PlumberStops at the wall
VS
SteadfastThe entire transition, one crew
Included 01
New Sewer Lateral, Installed
We excavate one precise trench and install the new lateral from your foundation toward the main — correct pipe, correct bedding, correct slope, built to pass inspection the first time.
Included 02
Connection Made & Inspected
The tie-in is the part that has to be perfect. We make the connection to the sewer system, coordinate directly with the district and inspectors, and get it signed off properly — no loose ends on your permit.
Included 03
Final Tank Pump-Out
Before a tank can be abandoned, it has to be emptied. We take care of the final pump-out as part of the decommission — you don’t schedule a second company or coordinate a second truck.
Included 04
Tank Decommissioned Per Code
An abandoned tank left as-is is a collapse hazard and a liability. We crush or fill it to your county’s exact spec and document the abandonment — so it’s done, on record, and never your problem.
Included 05
Permits & Paperwork, Handled
Connection permits, decommission paperwork, utility locates, inspection scheduling — we run all of it. You get copies for your records without ever standing in line at the county office.
Included 06
Site Restoration
Backfilled in lifts, compacted, and graded out — not a mounded scar across the lawn. We leave your property looking like a finished job, because that’s what it is.
04Our Process

From First Call to Fully Converted

Step 1
Assess
We walk your property, locate the tank and the existing line, check where sewer service is available for your parcel, and map the cleanest route for the new lateral. You get a fixed-price quote and a real timeline — before anything is committed.
Step 2
Permit
We pull the connection and decommission permits, file the district paperwork, and call in utility locates. This is the part that stalls most conversions for weeks — we’ve run it enough times to keep it moving.
Step 3
Install the Lateral
One precise trench from your foundation toward the main. Proper bedding, correct pipe, correct slope — the boring details that decide whether a lateral lasts 50 years or shows up on a camera inspection in five.
Step 4
Connect & Reroute
We make the tie-in, pass inspection, and switch your home’s flow over to the new line. The changeover itself usually costs you less than a day of normal water use — not a week of camping in your own house.
Step 5
Decommission the Tank
The old tank gets its final pump-out, then is crushed or filled and abandoned to your county’s exact spec — inspected and documented. No buried liability, no mystery hazard for the next owner to find.
Step 6
Restore
Backfilled, compacted, and graded out clean. We hand you the final paperwork for your records — permits closed, decommission documented — and your yard goes back to being just a yard.
Steadfast Septic compass emblem
05Why Steadfast

The Only Job Where You Need Both of Our Licenses

A conversion starts as a sewer job and ends as a septic job. Sewer companies have never set foot in a tank; septic companies don’t build laterals. We’ve spent years mastering both sides of the line — which is exactly why the job nobody else can quote cleanly is the one we do best.

Dual Expertise
Septic systems and sewer laterals under one roof. A conversion sits exactly at that intersection — it’s not a stretch for us, it’s the sweet spot.
Licensed & Insured
Fully licensed and insured for excavation and outside wastewater work in Idaho and Washington. [REPLACE: add license #s]
In-House Equipment
Excavation machinery, compaction, and inspection cameras owned and run by our own crew — no subs, no handoffs, no finger-pointing between contractors.
If Nobody Else Can
Deep mains, tight access, ledge rock, tanks in the worst possible spot — the conversions other companies walk away from are the ones we’re known for.
Can I Connect to Sewer If My Septic System Fails?
The question that brings most homeowners to this page — answered straight, by the guy who runs the crew.
Tyler McCullough — Steadfast Septic

Septic to Sewer Conversion Service Across Spokane County, WA & North Idaho

Proudly serving homeowners, contractors, and builders across Spokane County, Washington and North Idaho — including Spokane, Spokane Valley, Liberty Lake, Coeur d’Alene, Post Falls, Hayden, Rathdrum, and the surrounding communities.

Not converting after all? If your system has life left, see septic repair — and if it's replacement time on a septic lot, see septic system installation.

06Straight Answers

Septic to Sewer Conversion Questions

The on-site work usually runs one to three days: install the lateral, make the connection, decommission the tank, restore the site. The longer part of the calendar is permits and district paperwork, which we handle and keep moving. Your household is typically only “offline” for a few hours during the actual switchover — not days.
It depends entirely on your jurisdiction. Some areas require connection within a set window once sewer reaches your property, some only require it when a septic system fails or the property changes use, and some leave it optional. Rather than guessing from a website, we check the exact rules for your parcel as part of the free assessment — so you know whether this is a “must,” a “soon,” or a “when it makes sense.”
It gets properly retired — not just left buried. The tank is pumped out, then crushed or filled (or removed entirely where required) and abandoned to your county’s exact specification, with the paperwork to prove it. This step matters more than people think: an abandoned tank left intact is a collapse hazard, and an undocumented one becomes a headache the day you sell the house.
Yes — all of them. Connection permits, decommission paperwork, utility locates, and inspection scheduling with the county and the sewer district. A conversion touches more agencies than almost any other residential wastewater job, which is exactly why we run the paperwork instead of handing you a to-do list. You get copies of everything for your records.
Every conversion gets a fixed-price quote before any dirt moves. The big price drivers: distance and depth from your house to the connection point, what’s in the way (concrete, asphalt, trees, ledge rock), the decommission method your county requires, and the district’s own connection or capacity fees — which are set by the district, not by us, and we’ll show you them line-itemed so there are no surprises. [REPLACE: add typical project ranges once finalized]
Yes. Trenches are backfilled in lifts and compacted — the detail that prevents that sunken stripe across the lawn a year later — then graded out clean. If the route crosses concrete or asphalt, we cut clean lines and include the patch-back in your quote up front, not as a surprise at the end.
Sometimes that’s the honest answer — and because we do both, we’re one of the few companies with no reason to steer you either way. If your system has years of life left and sewer isn’t required for your parcel, we’ll tell you. If you’re about to pour money into a dying drainfield when the main is sitting in front of your house, we’ll tell you that too. You get the real math, then you decide. See our septic repair page for how the diagnosis-first repair side works.
Steadfast Septic

One Call Covers the Entire Conversion

No juggling an excavator, a pumper, and the permit office. Tell us about your property, and we’ll map the route, check your parcel’s rules, and hand you one fixed price for the whole transition — lateral to decommission.

(208) 889-9944 — Free Assessment

One crew, start to finishPermits handledTank retired per code

07Get Started Today

Get a Straight Answer on Your Conversion

Whether you’re required to connect or just weighing your options, start with the free assessment. We’ll check your parcel, walk the route, and give you the real number — so you can make the call with facts instead of guesses.

Request Your Free Assessment

We typically respond quickly