Top-rated septic system installers and replacers.

Get matched with top septic system installers and replacers in your area

Enter your zip and get matched with up to 3 pros

Matching on HomeAdvisor

Share some details icon
Share some details about your home project.
Match with local pros icon
Within moments, match with highly-rated local pros.
Compare quotes icon
Compare quotes and choose the best pro for the job.

Septic system installers and replacers in Seattle

Avatar for Patriot Elite Homes
Patriot Elite Homes
16212 Bothell Everett Hwy Suite F216
4.90(
40
)
Approved Pro
Patriot Elite Homes
16212 Bothell Everett Hwy Suite F216
4.90(
40
)
Approved Pro
Customers say: Quick response
Recommended by 97% of Angi customers
Recommended by 97% of HomeAdvisor customers
9 years of experience

At Patriot Elite Homes (formally Nightawk Construction LLC, we specialize in delivering high-quality residential construction and land improvement services across Snohomish and King County. Our team is committed to expert craftsmanship, clear communication, and lasting results. We offer complete drainage solutions, paver patios and walkways, septic system installations, and basement/foundation waterproofing to protect your property from the ground up. Our construction services include full-scale kitchen and bathroom remodels, whole-home renovations, and ADU design-build services tailored for functionality and value. Need more space or outdoor enhancements? We build custom decks, patio covers, fences, detached garages, and shops — all with structural integrity and style in mind. Whether you’re planning a remodel, expanding your living space, or solving site issues, Patriot Elite Homes brings professionalism and precision to every project.

"Top quality, skilled and professional, amazing value"

David B on September 2020

At Patriot Elite Homes (formally Nightawk Construction LLC, we specialize in delivering high-quality residential construction and land improvement services across Snohomish and King County. Our team is committed to expert craftsmanship, clear communication, and lasting results. We offer complete drainage solutions, paver patios and walkways, septic system installations, and basement/foundation waterproofing to protect your property from the ground up. Our construction services include full-scale kitchen and bathroom remodels, whole-home renovations, and ADU design-build services tailored for functionality and value. Need more space or outdoor enhancements? We build custom decks, patio covers, fences, detached garages, and shops — all with structural integrity and style in mind. Whether you’re planning a remodel, expanding your living space, or solving site issues, Patriot Elite Homes brings professionalism and precision to every project.

"Top quality, skilled and professional, amazing value"

David B on September 2020


Avatar for Septic Solutions
Septic Solutions
8629 156th Street Northeast
4.80(
58
)
Approved Pro
Septic Solutions
8629 156th Street Northeast
4.80(
58
)
Approved Pro
Super Service Award
Customers say: Quality work
Recommended by 94% of Angi customers
Recommended by 94% of HomeAdvisor customers
21 local quotes requested

We pride our company on reliability, great communication, integrity and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

"They were great, gave an estimate and were on time and professional."

Diane F on February 2025

We pride our company on reliability, great communication, integrity and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

"They were great, gave an estimate and were on time and professional."

Diane F on February 2025


Freedom Excavation
10470 Battle Point Drive NE
New on HomeAdvisorNew on Angi
Approved Pro
Freedom Excavation
10470 Battle Point Drive NE
New on AngiNew on HomeAdvisor
Approved Pro
14 local quotes requested
6 years of experience

Freedom Excavation is committed to excellence every aspect of our business. We uphold a standard of integrity, bound by fairness, honesty, and professional responsibility. Our distinction is the quality of service we bring to our customers as well as our ability to give you a quick, fair, and accurate estimate. Accurate knowledge of our trade, combined with ability is what makes is true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business.

Freedom Excavation is committed to excellence every aspect of our business. We uphold a standard of integrity, bound by fairness, honesty, and professional responsibility. Our distinction is the quality of service we bring to our customers as well as our ability to give you a quick, fair, and accurate estimate. Accurate knowledge of our trade, combined with ability is what makes is true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business.


Avatar for Beacon Plumbing & Mechanical INC
Beacon Plumbing & Mechanical INC
515 7th Ave S
5.00(
6
)
Approved Pro
Beacon Plumbing & Mechanical INC
515 7th Ave S
5.00(
6
)
Approved Pro
Customers say: Quick response
30 local quotes requested
26 years of experience

Beacon Plumbing is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

"The tech explained everything and was very polite."

Michelle B on April 2025

Beacon Plumbing is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

"The tech explained everything and was very polite."

Michelle B on April 2025


Avatar for Iron Earth Construction LLC
Iron Earth Construction LLC
115 West Hill Street
5.00(
3
)
Approved Pro
Iron Earth Construction LLC
115 West Hill Street
5.00(
3
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
91 local quotes requested

We are committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our

"Very accommodating and great service and product"

sally k on September 2023

We are committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our

"Very accommodating and great service and product"

sally k on September 2023


Avatar for Extra Mile Construction LLC
Extra Mile Construction LLC
8020 ROBE MENZEL RD
5.00(
2
)
Approved Pro
Extra Mile Construction LLC
8020 ROBE MENZEL RD
5.00(
2
)
Approved Pro
25 years of experience
Free onsite estimate

We’re a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We offer a variety of General Contractor Home Improvement services that are customizable to each individual project. We specialize in Additions and Kitchen Remodels, but also offer a wide range of expertise for a variety of other projects. We pride ourselves on the quality of our work as well as our commitment to outstanding results. We look forward to building lasting relationships and guarantee your satisfaction!

"Job was done well. Will be having them do more work in the future including installing our septic, drainage and land scraping. Prices are reasonable. Would highly recommend this business. "

Laura L on May 2025

We’re a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We offer a variety of General Contractor Home Improvement services that are customizable to each individual project. We specialize in Additions and Kitchen Remodels, but also offer a wide range of expertise for a variety of other projects. We pride ourselves on the quality of our work as well as our commitment to outstanding results. We look forward to building lasting relationships and guarantee your satisfaction!

"Job was done well. Will be having them do more work in the future including installing our septic, drainage and land scraping. Prices are reasonable. Would highly recommend this business. "

Laura L on May 2025


Avatar for Honeycomb Construction
Honeycomb Construction
618 146th Avenue NE, #64
4.81(
37
)
Approved Pro
Honeycomb Construction
618 146th Avenue NE, #64
4.81(
37
)
Approved Pro
Customers say: Quick response
Recommended by 97% of Angi customers
Recommended by 97% of HomeAdvisor customers
246 local quotes requested

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

"Very professional and efficient. We had a great experience!"

Samantha S on March 2024

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

"Very professional and efficient. We had a great experience!"

Samantha S on March 2024


Avatar for Roto-Rooter Plumbing & Water Cleanup
Roto-Rooter Plumbing & Water Cleanup
121 Lakeside Ave
4.13(
388
)
Approved Pro
Roto-Rooter Plumbing & Water Cleanup
121 Lakeside Ave
4.13(
388
)
Approved Pro
Customers say: Quick response
2517 local quotes requested
51 years of experience

When you need an emergency plumber or a drain cleaner, call Roto-Rooter Plumbing & Water Cleanup of Delmarva, a local family-owned franchise. Your fast & reliable plumber can fix any plumbing problem, including sump pumps, toilet repair, faucet repair, faucet replacement, garbage disposals, water heaters, bathtubs, showers, and outside faucets. Roto-Rooter is best known for drain cleaning & sewer cleaning. We fix drain clogs, clogged toilets or sinks, blockage of main sewer lines, slow draining shower and bathtub drains, sewer lines and leaking or burst pipes. We also specialize in water damage restoration & water cleanup services. We can fix and clean up your flooded basement too. Roto-Rooter Plumbing & Water Cleanup is a local, 24-hour plumber and provides emergency service.

"My elderly mother is partially blind and disabled. On November 1, 2021 her washing machine broke leaking water in her home. In desperation she called rotor rooter. Roto rooter came out, stopped the leak, and put dryers in and left. They returned a few days later to remove the dryers. The technician quoted my mother a cost of about $3000.00. My mother signed a contract but could not see what she was signing. After Roto rooter Reno removed the dryers they sent a bill to my mother for $9000.00. The contract she signed stated Roto rooter would remove walls, roofing, insulation, baseboard, tile etc. Roto rooter didn’t do any of those things. Roto rooter is price gauging and took advantage of an elderly disabled woman. Roto rooter technicians were in the home no more than 3 hours total. First my mother did not have capacity to enter into a contract as she couldn’t see what she was signing. 2 Roto rooters technicians told her the cost would be about $3000.00. 3 Roto rooter did not do the work in the contract. I believe Roto rooter is commuting elder abuse and fraud."

Marcus R on December 2021

When you need an emergency plumber or a drain cleaner, call Roto-Rooter Plumbing & Water Cleanup of Delmarva, a local family-owned franchise. Your fast & reliable plumber can fix any plumbing problem, including sump pumps, toilet repair, faucet repair, faucet replacement, garbage disposals, water heaters, bathtubs, showers, and outside faucets. Roto-Rooter is best known for drain cleaning & sewer cleaning. We fix drain clogs, clogged toilets or sinks, blockage of main sewer lines, slow draining shower and bathtub drains, sewer lines and leaking or burst pipes. We also specialize in water damage restoration & water cleanup services. We can fix and clean up your flooded basement too. Roto-Rooter Plumbing & Water Cleanup is a local, 24-hour plumber and provides emergency service.

"My elderly mother is partially blind and disabled. On November 1, 2021 her washing machine broke leaking water in her home. In desperation she called rotor rooter. Roto rooter came out, stopped the leak, and put dryers in and left. They returned a few days later to remove the dryers. The technician quoted my mother a cost of about $3000.00. My mother signed a contract but could not see what she was signing. After Roto rooter Reno removed the dryers they sent a bill to my mother for $9000.00. The contract she signed stated Roto rooter would remove walls, roofing, insulation, baseboard, tile etc. Roto rooter didn’t do any of those things. Roto rooter is price gauging and took advantage of an elderly disabled woman. Roto rooter technicians were in the home no more than 3 hours total. First my mother did not have capacity to enter into a contract as she couldn’t see what she was signing. 2 Roto rooters technicians told her the cost would be about $3000.00. 3 Roto rooter did not do the work in the contract. I believe Roto rooter is commuting elder abuse and fraud."

Marcus R on December 2021


Avatar for Knockout Plumbing & Mechanical, LLC
Knockout Plumbing & Mechanical, LLC
1724 S Spokane St
5.00(
14
)
Approved Pro
Knockout Plumbing & Mechanical, LLC
1724 S Spokane St
5.00(
14
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
1235 local quotes requested

Knockout Plumbing & Mechanical LLC is a local Seattle based company. Knockout strives to leave their clients with peace of mind when each job is said and done. From hydro jetting and sewer repair to remodels/new construction we knock it out. We look forward to hearing from you, so please never hesitate to reach out.

"We had a great experience with Knockout. Small plumbing repair job that they were able to fix quickly. Gave us multiple options on how best to address the immediate problem, as well as prospective problems in the future. No complaints and would definitely hire again."

Will B on March 2024

Knockout Plumbing & Mechanical LLC is a local Seattle based company. Knockout strives to leave their clients with peace of mind when each job is said and done. From hydro jetting and sewer repair to remodels/new construction we knock it out. We look forward to hearing from you, so please never hesitate to reach out.

"We had a great experience with Knockout. Small plumbing repair job that they were able to fix quickly. Gave us multiple options on how best to address the immediate problem, as well as prospective problems in the future. No complaints and would definitely hire again."

Will B on March 2024


Avatar for A Advanced Septic
A Advanced Septic
1602 W Valley Hwy S
4.33(
112
)
Approved Pro
A Advanced Septic
1602 W Valley Hwy S
4.33(
112
)
Approved Pro
Customers say: Super punctual
309 local quotes requested
19 years of experience

Through unique technology, experience and compassion, we serve our customers while creating and maintaining a reputation of excellence. We service: Pierce County, King County, Thurston County, and Kitsap County.

"there is a quick summary at the bottom if you want to skip the details. I have received service from this company twice. The first time I had a leak in a bathtub. They removed the drain with a Dremel since it was stuck, then they were about to leave to go to home depot to get plumber's putty, but I had some so they were able to get the part quickly replaced. Maybe this is a bit of a fluke, but that seems like a fairly basic thing to have when going to fix this kind of leak. Overall it was a positive interaction so I didn't think much of it. I recently bought a bidet on amazon. It arrived and I put it in. The problem was that I couldn't connect the toilet to the wall since the hose was a different size then the wall piece. The directions wanted me to remove the valve stem from the wall and replace it with their own. I called A Advanced because when it comes to plumbing, i would rather leave that to the professionals. I had called it a hose bibb because I just didn't know what it was called. someone called me back and asked me to explain in better detail what i needed done. I explained that the "hose bibb" needed to be replaced for me to connect my toilet and that I had the part to do it. from that conversation i received an estimate for $280.87. I was at work that day so couldn't be there, but my wife was there. The plumber that arrived worked for a while on the toilet, then went to home depot to find parts, then came back to the house and worked on it longer, then finally decided that it couldn't be done. We were charged $768.14 for nothing to get fixed. I called them to figure out what happened, I called near closing so they were not able to get a hold of anyone and it waited until the next week for me to talk to someone. I found out that the plumber never received the bag of parts, it was about 2 feet away in the sink. the same plumber came out and looked at it again, and went to home depot again. I was at work and managed to contact him while he was at home depot. I was told that the problem was with the thread depth and that there was no way to install this Chinese toilet without special ordering a part, and if I wanted him to keep working on it he was going to have to charge me more money. I declined. (Its not a Chinese toilet, the company that makes them is out of California.) At this point I was beyond frustrated. I left work early, drove home, went to home depot with the parts I needed to connect, and found a perfect fit within about 10 minutes of looking. I bought a Hex Bushing 3/4 in MIP x 1/2 in FIP for $7.75. I attached it to the included hose and then attached that to the valve stem. and everything worked. Home depot made it easy to find since both connectors were the same type. I just needed to find the appropriate brass adapter. the threads on the toilet hose are identical to the threads on a US water heater. I called A Advanced back and presented my evidence. I was asked what it would take to make this right. I asked for some of my money back. I can understand getting charged for the plumber going out to my house without a full understanding of what is going on. but at no point did he ever tell my wife that he was going way over the estimate. this is the exact response i got back. "I spoke with my COO and my foreman due to the amount of time we spent on the project we are unable to provide any sort of refund. I understand that is not something you want to hear but that is our decision." _____________________________________________ to summarize: - every time this company has come out to my house they have needed to go to Home Depot during the visit. - I was charged nearly 3 times the estimate with no work done and no warning that the bill was piling up. - the plumber was never able to install the toilet despite multiple trips to home depot - I installed the toilet with a $7 adapter i found at home depot in about 10 minutes. (I am not a plumber) - The company chose to not refund me anything If a plumbing company needs to go to home depot every time they do a house call, that is a company that is not prepared at best, and a scam company at worst."

Justin M on December 2024

Through unique technology, experience and compassion, we serve our customers while creating and maintaining a reputation of excellence. We service: Pierce County, King County, Thurston County, and Kitsap County.

"there is a quick summary at the bottom if you want to skip the details. I have received service from this company twice. The first time I had a leak in a bathtub. They removed the drain with a Dremel since it was stuck, then they were about to leave to go to home depot to get plumber's putty, but I had some so they were able to get the part quickly replaced. Maybe this is a bit of a fluke, but that seems like a fairly basic thing to have when going to fix this kind of leak. Overall it was a positive interaction so I didn't think much of it. I recently bought a bidet on amazon. It arrived and I put it in. The problem was that I couldn't connect the toilet to the wall since the hose was a different size then the wall piece. The directions wanted me to remove the valve stem from the wall and replace it with their own. I called A Advanced because when it comes to plumbing, i would rather leave that to the professionals. I had called it a hose bibb because I just didn't know what it was called. someone called me back and asked me to explain in better detail what i needed done. I explained that the "hose bibb" needed to be replaced for me to connect my toilet and that I had the part to do it. from that conversation i received an estimate for $280.87. I was at work that day so couldn't be there, but my wife was there. The plumber that arrived worked for a while on the toilet, then went to home depot to find parts, then came back to the house and worked on it longer, then finally decided that it couldn't be done. We were charged $768.14 for nothing to get fixed. I called them to figure out what happened, I called near closing so they were not able to get a hold of anyone and it waited until the next week for me to talk to someone. I found out that the plumber never received the bag of parts, it was about 2 feet away in the sink. the same plumber came out and looked at it again, and went to home depot again. I was at work and managed to contact him while he was at home depot. I was told that the problem was with the thread depth and that there was no way to install this Chinese toilet without special ordering a part, and if I wanted him to keep working on it he was going to have to charge me more money. I declined. (Its not a Chinese toilet, the company that makes them is out of California.) At this point I was beyond frustrated. I left work early, drove home, went to home depot with the parts I needed to connect, and found a perfect fit within about 10 minutes of looking. I bought a Hex Bushing 3/4 in MIP x 1/2 in FIP for $7.75. I attached it to the included hose and then attached that to the valve stem. and everything worked. Home depot made it easy to find since both connectors were the same type. I just needed to find the appropriate brass adapter. the threads on the toilet hose are identical to the threads on a US water heater. I called A Advanced back and presented my evidence. I was asked what it would take to make this right. I asked for some of my money back. I can understand getting charged for the plumber going out to my house without a full understanding of what is going on. but at no point did he ever tell my wife that he was going way over the estimate. this is the exact response i got back. "I spoke with my COO and my foreman due to the amount of time we spent on the project we are unable to provide any sort of refund. I understand that is not something you want to hear but that is our decision." _____________________________________________ to summarize: - every time this company has come out to my house they have needed to go to Home Depot during the visit. - I was charged nearly 3 times the estimate with no work done and no warning that the bill was piling up. - the plumber was never able to install the toilet despite multiple trips to home depot - I installed the toilet with a $7 adapter i found at home depot in about 10 minutes. (I am not a plumber) - The company chose to not refund me anything If a plumbing company needs to go to home depot every time they do a house call, that is a company that is not prepared at best, and a scam company at worst."

Justin M on December 2024

...
Showing 1-10 of 284

FAQs for septic system installation and replacement projects in Seattle, WA

A septic tank typically lasts 15 to 20 years, depending on the materials used, maintenance frequency, and soil conditions. Regular inspections, proper pumping, and careful water usage can extend its lifespan. Professional maintenance ensures your system remains efficient and helps prevent premature failure.

Your septic tank should be pumped every three to five years. In fact, the recommended interval for pumping is every three to five years, as this schedule effectively prevents the buildup of solids and maintains the system's performance. Factors such as household size, water usage, and the capacity of the tank can influence this interval. Adhering to a regular pumping schedule minimizes the risks of backups and system overload, ensuring efficient operation and longevity of your septic system.

Your septic system shows signs of failing when you detect noticeable odors and unusual moisture, or overly green patches in your yard. In essence, clear indications such as unpleasant smells, gurgling noises from the plumbing, and areas of excessive vegetation or saturation signal that the system may be compromised. Additional symptoms include slow drainage and standing water near the drain field. These warning signs require immediate professional evaluation to prevent severe damage or environmental hazards.

The Seattle, WA homeowners’ guide to septic system installations and replacements
From average costs to expert advice, get all the answers you need to get your job done.
A septic system on the backyard
Apr 16, 2025
Apr 16, 2025
If you need to install a new septic system, use our cost guide to budget for this extensive project.
outdoor water lines with backflow preventer
Jun 12, 2025
Jun 12, 2025
Backflow preventer costs depend on type, size, location, and labor costs. This guide breaks down the cost factors to help you budget.
Man inspecting well
Apr 21, 2025
Apr 21, 2025
Discover how factors such as your location, service requirements, labor rates, and add-ons affect well inspection costs.
well pump in borehole water supply system
Apr 16, 2025
Apr 16, 2025
Budget for well pump repair costs based on factors such as parts and components, location, pump type, labor, inspections, and more.
septic tank in yard under repair
Mar 23, 2025
Mar 23, 2025
Budget for septic tank repair costs based on factors including parts, materials, labor, ongoing maintenance costs, and more.
Girl washing her hands in the kitchen
Mar 20, 2025
Mar 20, 2025
Use this guide to budget for a septic system inspection based on cost factors such as inspection type, accessibility, and additional septic services.
Share project details to get started.