65/100CR Score
Ranked #1 because of its Google rating and trade focus: 5.0★ from 835 Google reviews, listed on Google as “Septic system service”.
Best Septic Service Companies in Mountlake Terrace, WA (2026)
141 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Mountlake Terrace: Zoom Drain of Seattle, CR Score 65/100; 5.0★ from 835 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Fresh N Clean Septic, posts 24/7 hours; ranked #2 of 141.
- 8
Most-reviewed: Gene Johnson Plumbing, 4,041 Google reviews at 4.8★, the most of 141 ranked; ranked #8.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
141 Mountlake Terrace septic service companies are ranked here by CR Score, from ten published factors. 76 are open 24/7, 115 open Saturdays and 92 open Sundays, based on posted hours. The median Google rating is 4.9★ across 141 rated businesses.
Top 10 septic service companies in Mountlake Terrace at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Zoom Drain of Seattle | 65 | 5.0★ (835) | Seattle, 6 mi away | 24/7 | Overall |
| 2 | Fresh N Clean Septic | 63 | 4.9★ (663) | Woodinville, 9 mi away | 24/7 | Emergencies |
| 3 | A Wesco Septic Services | 62 | 4.8★ (550) | Snohomish, 10 mi away | 24/7 | — |
| 4 | Price Busters Plumbing & Sewer | 62 | 4.9★ (781) | Lynnwood, 2 mi away | 24/7 | — |
| 5 | All County Septic Service | 61 | 4.9★ (121) | Everett, 8 mi away | 24/7 | — |
| 6 | 2 Sons Plumbing, Sewer, Septic, Electric, Heating & Air | 60 | 4.9★ (3,532) | Seattle, 9 mi away | Sat · Sun · Evenings | — |
| 7 | A Wesco Septic Services | 60 | 4.7★ (229) | Snohomish, 10 mi away | 24/7 | — |
| 8 | Gene Johnson Plumbing | 60 | 4.8★ (4,041) | Seattle, 6 mi away | 24/7 | Most reviews |
| 9 | Done Right Plumbing, Heating, and Sewer Repair | 59 | 4.9★ (268) | Lynnwood, 4 mi away | 24/7 | — |
| 10 | Knight Rooter Sewer & Drain Cleaning Services | 59 | 5.0★ (218) | Seattle, 6 mi away | 24/7 | — |
The 141 best septic service companies in Mountlake Terrace, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Based in Woodinville, 9 mi away
63/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.9★ from 663 Google reviews, listed on Google as “Septic system service”.
Based in Snohomish, 10 mi away
62/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.8★ from 550 Google reviews, listed on Google as “Septic system service”.
Based in Lynnwood, 2 mi away
62/100CR ScoreRanked #4 because of its Google rating and review volume: 4.9★ from 781 Google reviews.
Based in Everett, 8 mi away
61/100CR ScoreRanked #5 because of its Google rating and trade focus: 4.9★ from 121 Google reviews, listed on Google as “Septic system service”.
Based in Seattle, 9 mi away
60/100CR ScoreRanked #6 because of its Google rating and review volume: 4.9★ from 3,532 Google reviews.
Based in Snohomish, 10 mi away
60/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.7★ from 229 Google reviews, listed on Google as “Septic system service”.
Based in Seattle, 6 mi away
60/100CR ScoreRanked #8 because of its Google rating and review volume: 4.8★ from 4,041 Google reviews, the most in Mountlake Terrace.
Based in Lynnwood, 4 mi away
59/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.9★ from 268 Google reviews, listed on Google as “HVAC contractor”.
Based in Seattle, 6 mi away
59/100CR ScoreRanked #10 because of its Google rating and trade focus: 5.0★ from 218 Google reviews, listed on Google as “Plumber”.
Based in Seattle, 6 mi away
59/100CR ScoreRanked #11 because of its Google rating and review volume: 4.8★ from 409 Google reviews.
#12 Sewer Friendly
Based in Edmonds, 2 mi away
59/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.8★ from 198 Google reviews, listed on Google as “Plumber”.
Based in Mountlake Terrace
59/100CR ScoreRanked #13 because of its Google rating and review volume: 4.5★ from 436 Google reviews.
Based in Everett, 9 mi away
59/100CR ScoreRanked #14 because of its Google rating and trade focus: 5.0★ from 279 Google reviews, listed on Google as “Plumber”.
Based in Seattle, 4 mi away
59/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.8★ from 251 Google reviews, listed on Google as “Plumber”.
Based in Bothell, 5 mi away
58/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.9★ from 151 Google reviews, listed on Google as “Plumber”.
Based in Seattle, 11 mi away
58/100CR ScoreRanked #17 because of its Google rating and review volume: 4.7★ from 716 Google reviews.
#18 Septic Response
Based in Kirkland, 9 mi away
58/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.9★ from 213 Google reviews, listed on Google as “Plumber”.
Based in Bellevue, 14 mi away
58/100CR ScoreRanked #19 because of its Google rating and trade focus: 5.0★ from 310 Google reviews, listed on Google as “Plumber”.
Based in Edmonds, 2 mi away
57/100CR ScoreRanked #20 because of its Google rating and review volume: 4.7★ from 615 Google reviews.
Based in Snohomish, 17 mi away
57/100CR ScoreRanked #21 because of its Google rating and trade focus: 4.9★ from 67 Google reviews, listed on Google as “Septic system service”.
Based in Bothell, 5 mi away
57/100CR ScoreRanked #22 because of its Google rating and trade focus: 5.0★ from 180 Google reviews, listed on Google as “Plumber”.
Based in Everett, 7 mi away
57/100CR ScoreRanked #23 because of its Google rating and trade focus: 5.0★ from 90 Google reviews, listed on Google as “Plumber”.
Based in Bellevue, 16 mi away
57/100CR ScoreRanked #24 because of its Google rating and trade focus: 5.0★ from 316 Google reviews, listed on Google as “Plumber”.
Based in Marysville, 24 mi away
57/100CR ScoreRanked #25 because of its Google rating and trade focus: 4.9★ from 132 Google reviews, listed on Google as “Septic system service”.
Septic service companies ranked #26 to #50
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 141 ranked septic service companies here; the rest are on their profiles.
Also serving Mountlake Terrace
20 more septic service companies within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| Ace Sewer Line Repair Services | 14 mi | |
| Cal Septic LLC | 13 mi | |
| Clearline Sewer Repair | 5.0★ (1) | 16 mi |
| Corey's On-Site Septic Services | 15 mi | |
| Drain Field Mechanic | 5.0★ (2) | 21 mi |
| E & R Septic & Landscaping | 5.0★ (1) | 13 mi |
| Earthwise Excavation | 5.0★ (1) | 10 mi |
| Evergreen Sanitation | 1.0★ (1) | 22 mi |
| Hackney Designs | 5.0★ (1) | 19 mi |
| I Need A Plumber Now and Sewer Services | 5.0★ (2) | 21 mi |
| Insight Septic Design | 5.0★ (2) | 25 mi |
| Limitless Sewer Solutions, LLC | 5.0★ (1) | 12 mi |
| Nathan Cleaver & Associates | 1.0★ (1) | 17 mi |
| Northrup Construction Inc | 5.0★ (1) | 19 mi |
| Pipe Commander Sewer And Septic | 15 mi | |
| Pro Flow Plumbing & Sewers | 5.0★ (2) | 15 mi |
| S V Greso | 13 mi | |
| Seattle Septic Pros | 13 mi | |
| Sorrell Septic Design LLC | 5.0★ (2) | 22 mi |
| The Septic Group (Formerly Snohomish Septic) | 1.0★ (2) | 19 mi |
How we ranked Mountlake Terrace septic service companies
We scored 141 Mountlake Terrace septic service companies on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed November 3, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Mountlake Terrace data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |
Septic service companies in Mountlake Terrace: frequently asked questions
Who is the best septic service company in Mountlake Terrace?
By CR Score, the highest-ranked septic service company in Mountlake Terrace, WA is Zoom Drain of Seattle with a CR Score of 65/100. It has 5.0★ from 835 Google reviews. It is open 24/7. Fresh N Clean Septic (#2) and A Wesco Septic Services (#3) follow. We ranked 141 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Mountlake Terrace?
ContractorsRanked ranks 141 septic service companies serving Mountlake Terrace, WA. 1 of them is based in Mountlake Terrace; the rest serve it from nearby towns. Another 20 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Mountlake Terrace are open 24/7?
76 ranked septic service companies in Mountlake Terrace post 24/7 hours. The highest-ranked are Zoom Drain of Seattle (#1), Fresh N Clean Septic (#2) and A Wesco Septic Services (#3). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Mountlake Terrace work on weekends?
115 of 141 ranked septic service companies post Saturday hours and 92 post Sunday hours. The highest-ranked open Saturdays are Zoom Drain of Seattle (#1), Fresh N Clean Septic (#2) and A Wesco Septic Services (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Mountlake Terrace septic service companies have?
The median Google rating among 141 rated septic service companies in Mountlake Terrace is 4.9★, with a median of 39 reviews. Gene Johnson Plumbing has the most, 4,041 reviews, and ranks #8. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ContractorsRanked rank septic service companies?
Each septic service company gets a 0–100 CR Score from ten published factors, led by reputation (25%), credentials (15%), review volume (10%) and trade focus (10%). A business with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.
Do septic service companies outside Mountlake Terrace count in this ranking?
Yes, if they are within 25 mi of the Mountlake Terrace city center, our service radius for septic service companies. Each listing shows where the business is based and how far away it is. Proximity is 5% of the CR Score, so a nearby business gets a small edge.
Can septic service companies pay to rank higher on ContractorsRanked?
No. The CR Score never reads payment status, and this ranking has 0 paid placements. Up to 3 Featured businesses may appear above the list, labelled Featured and showing their honest rank.
Update log for Mountlake Terrace
- November 2026: CR Scores recalculated for 141 septic service companies serving Mountlake Terrace.
- November 2026: 1 duplicate listing merged.
More septic service companies and Mountlake Terrace pages
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