The Only Septic Partner You’ll Ever Need for Your Custom Builds

We manage the entire septic process — from soil evaluation to final county approval — so your projects move forward without delays, surprises, or compliance issues.

49+ Years of Combined Industry Experience. Built for builders who don’t tolerate chaos.

✔ Integrated With Your Build Schedule ✔ Code-Compliant Installations ✔ White-Glove Service ✔ Zero Surprise Change Orders

Let's See If We're a Good Fit to Work Together!

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

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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
    Church
    Official Septic Installation & Repair Specialist

Most Septic Contractors Create Build Delays

When septic isn’t managed correctly, everything downstream suffers.

When you get septic setbacks, your entire build schedule suffers

We eliminate that risk

A fully managed, end-to-end septic installation system built specifically for custom home builders in North Idaho & Spokane County.

We handle everything — so you don’t have to.

1. Pre-Construction Site & Soil Coordination

We coordinate soil test holes, evaluate lot constraints, and identify issues before they cost you time or money.

2. Design & County Management

We are and work directly with designers and manage documentation to ensure compliance without delays.

3. Build Schedule Integration

We integrate directly into your construction timeline with clear mobilization windows.

4. Precision Installation

Code-compliant installation, clean job site standards, and drainfield protection protocols.

5. Inspection & Approval Coordination

We manage inspection scheduling, backfill and documentation so your project stays on track.

6. Builder Handoff Package

Final documentation, homeowner education materials, and ongoing advisory support.

We Operate Like an Infrastructure Partner — Not a Subcontractor

🔷 We don’t bid low and inflate later.
🔷 We don’t disappear mid-project.
🔷 We don’t create scheduling chaos.
🔷 We don’t leave job sites messy.

We build long-term partnerships with serious builders.
Seamless septic installation that never delays your build.
49+ years across three generations focused specifically on septic infrastructure.
Proactive scheduling and early issue detection to eliminate surprises.
We handle soil coordination, compliance, inspections, and documentation.

This Program Is Built for Reputation-Driven Builders

We work best with builders who:

🏠 Build custom or semi-custom homes
🗓️ Value scheduling precision
🔋 Care about long-term system performance
😡 Want fewer infrastructure headaches
💪🏼 Protect their reputation at closing

If you’re competing only on lowest bid, we’re not the right fit.

If you’re building long-term value, we are.

How We Work

Step 1

Builder Strategy Call