Septic System Installation & Replacement in North Idaho & Spokane — Installed Once. Installed Right. Guaranteed to Pass.
The septic installers other contractors call when the site gets hard — pressure distribution, mounds, advanced treatment, and the systems everyone else turns down. Serving homeowners, builders, and real estate transactions in Coeur d'Alene, Post Falls, Hayden, Rathdrum, Sandpoint, and greater Spokane.
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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
ChurchOfficial Septic Installation & Repair Specialist
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.
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
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.
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 & TroubleshootingIf 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 FailureWe 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 DiagnosisTrue 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 InstallTyler 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 UpsellHave 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 & RepairFrom 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 ReplacementI 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 & PumpingReady to be our next success story?
Get Your Free Estimate →What Our Customers Say
Reviews below are verified Google reviews for Lilly’s Septic Service, our sister company in King County, WA, where the Steadfast crew has installed, repaired and troubleshot septic systems for years. Steadfast Septic is new to North Idaho — the crew and the standard are not.
“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.”
“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.”
“I’m totally impressed with the way these guys handled this repair, Josh, Jeremy and Tyler were just awesome. Our system is working fine now, thanks again for the great service!!”
This Is For You If:
- You're building a new home and need a septic system designed and installed correctly
- Your existing system has failed and you need a full replacement done right
- You're selling a home, the inspection flagged the septic, and you need it replaced before closing
- You're remodeling or adding an ADU and the county requires a new or upgraded system
- You've been burned by a contractor before and you're done gambling
- Other contractors said your site is "too tough" — steep slope, high groundwater, bad soil, tight lot. That's the work we specialize in.
This Is NOT For You If:
- You're shopping purely for the cheapest bid regardless of quality
- You want someone to cut corners to save a few thousand dollars
- You're looking for pumping only (we don't pump — we install, replace, and repair)
Most Septic Systems Fail Because They Were Installed to Minimum Standards
When installation is rushed or under-designed, you get:
Premature drainfield failure
Standing water and odors
Pump burnout
System non-compliance
Expensive emergency replacements
A system that barely passed inspection — and won't last
A septic system lasts 30+ years when it's installed correctly. It lasts 5 when it isn't.
This isn't landscaping. It's the infrastructure your home depends on every single day — every flush, every shower, every load of laundry. When it fails, your home doesn't work. And the harder the site — high water table, shallow soil, steep grade — the faster a minimum-standards install falls apart. Difficult ground doesn't forgive shortcuts. That's why it's all we specialize in.
Here's What Makes Steadfast Different
| What Most Contractors Do | What Steadfast Does |
|---|---|
| "That site's too complicated for us" | Pressure, mound, advanced treatment, tough sites — the harder it is, the more it's our job |
| Return your call in 2-3 days (maybe) | you talk to the owner, not a call center |
| Ballpark estimate over the phone | On-site assessment with fixed-price written quote |
| Install to minimum code and move on | Build for 25-40 year performance — not just inspection day |
| "It should pass inspection" | Every install inspected and permit-closed |
| Verbal quote that changes on invoice day | Locked contract — the price doesn't move |
| Finish the job and disappear | Milestone text updates to you AND your agent |
| No documentation after the job | Complete system documentation package for records and resale |
Your Free Steadfast Site Assessment — Here's Exactly What You Get:
On-site Soil & Lot Evaluation
After your first call
System Type Recommendation
Gravity, pressure, mound, or advanced treatment — matched to your soil, slope, and setbacks
Written Fixed-Price Quote
The number you see is the number you pay
Real-Estate-Ready Proposal PDF
Delivered same day as your assessment
Full Project Timeline
From permit to final inspection
Zero Obligation. Zero Pressure.
Zero cost for the entire assessment
Here's How It Works
Call, Text, or Submit a Request
We respond quickly. Every time.
We Evaluate Your Site
Licensed tech on your property quickly.
You Get Clear Scope & Pricing
Fixed-price written quote. No surprises.
We Install It Right
Professional crew. Code-compliant. Built to last decades — no matter how hard your site is.
New Installation & Full System Replacement
Whether you're building a new home, replacing a failed system, modernizing an aging septic, remodeling, or adding an ADU — we handle complete system installation and replacement. And we specialize in the hard ones: pressure distribution, mound systems, advanced treatment units, high groundwater, shallow soils, steep slopes, and tight lots. When another installer says it can't be done, that's usually when our phone rings.
Design decisions matched to your soil conditions
Proper system sizing for your household
Precision excavation and grading
Drainfield construction for long-term durability
Component quality and integration
Code compliance that exceeds minimum standards
Minimum-code installs pass inspection. Professional installs protect homeowners.
Watch a Complex System Go In — Stage by Stage
Every install follows the same engineered sequence: assess and design for your soil, excavate with precision, set the tanks, build the distribution network, and restore the site. The system below isn't a basic gravity install — it's a pressure distribution build: two-compartment tank with an aerator, dedicated pump tank, and pressure-dosed laterals. The kind of system most installers turn down. Tap a stage to see it.
Transparent Pricing — No Mysteries, No Surprises
Final pricing depends on soil conditions, lot access, system design, and county requirements. Every project gets a fixed-price written quote before any work begins.
Gravity System
Best for: Standard lots with suitable soil and slope
Pressure Distribution
Best for: Challenging lots, shallow soil, or specific county requirements
Advanced Treatment (Type 2/3)
Best for: Environmentally sensitive areas, lakefront, small lots
Every Fear You Have About This Process — We've Already Solved It
When your closing date is 30 days out and your septic just failed, here's exactly what stands between you and panic — and how we eliminate every one of them.
I have no idea if this contractor is even legitimate — no local reviews, no track record in Idaho.
DEQ license number on every document. Verified Google reviews before we take our first local call.
What if the work is shoddy and it fails the county inspection?
If your system fails its first county inspection for any installation-related reason, we return and correct it at zero cost.
Are they actually licensed to work in Idaho?
Website, estimates, contracts, trucks. You'll never have to look it up.
Two contractors already looked at my lot and told me a system can't work here.
High groundwater, shallow soil, steep slopes, tight lots. Pressure distribution, mounds, and advanced treatment exist for exactly these properties — designing and building them is the core of what we do.
Every contractor I've called is two weeks out. My closing is in 30 days.
A licensed technician on your property to assess the site.
The permit process is a black hole.
We prepare, file, and track your permit from submission to approval.
What if the county rejects the design?
We work with designers who know Kootenai and Spokane County requirements cold.
I have no idea what this should cost. Am I about to get ripped off?
Real cost ranges posted on our website before your first conversation.
What if the final invoice is way higher than the quote?
No line-item additions. No scope creep. The only price change is a written change order you approve.
I need something professional for my real estate agent.
Formatted quote document built to drop into your transaction packet.
I've left three voicemails. Nobody is calling me back.
Every call, text, and email responded to within 2 business hours. In writing.
My agent keeps asking for updates and I have nothing to tell them.
Assessment done. Design submitted. Permit approved. Install scheduled. Inspection passed.
What if the inspector fails the install?
Every system we've installed has passed on the first inspection.
The Steadfast Triple Guarantee
On-Site Assessment
A licensed tech on your property to assess the site — your assessment is free.
Fixed-Price Lock
The quote you sign is the price you pay. Period. No change orders unless YOU request one in writing.
First-Pass Inspection Guarantee
Your system passes county inspection on the first try — or we fix it at zero cost to you.
What You Get After We're Done
See Our Work — Including the Sites Others Walked Away From
Pressure Distribution Install — Hayden, ID
Full System Replacement — Post Falls, ID
New Construction Install — Rathdrum, ID
Drainfield Construction — Coeur d'Alene, ID
Before & After — System Replacement
Install Time-Lapse Video
North Idaho build season runs April through October. Permit processing takes 2-4 weeks. The longer you wait, the tighter your timeline.
We take a limited number of installation projects per month to maintain quality standards. Don't wait until you're under pressure.
Check Availability →Stop Calling Contractors. Start Talking to Septic Specialists.
Here's what happens when you submit the form:
If you don't hire us, you still walk away with a professional site evaluation and honest pricing you can use to compare. And if another contractor already told you your site can't be done — bring us their reasons. We've built systems on the lots they walked away from.
49+ years across three generations. Licensed. Insured. Kootenai County, Bonner County & Spokane County.
Request Your Free Assessment
Owner callback. On-site assessment. Zero obligation.
Thinking About a New System?
Get a free site assessment and fixed-price quote. You talk to the owner, and we get a licensed tech on-site.