66/100CR 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 Seattle, WA (2026)
158 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Seattle: Zoom Drain of Seattle, CR Score 66/100; 5.0★ from 835 Google reviews; open 24/7.
- 3
Best for emergencies (open 24/7): A Advanced Septic & Construction Services, posts 24/7 hours; ranked #3 of 158.
- 5
Most-reviewed: Gene Johnson Plumbing, 4,041 Google reviews at 4.8★, the most of 158 ranked; ranked #5.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
158 Seattle septic service companies are ranked here by CR Score, from ten published factors. 81 are open 24/7, 122 open Saturdays and 103 open Sundays, based on posted hours. The median Google rating is 4.9★ across 158 rated businesses.
Top 10 septic service companies in Seattle at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Zoom Drain of Seattle | 66 | 5.0★ (835) | Seattle | 24/7 | Overall |
| 2 | 2 Sons Plumbing, Sewer, Septic, Electric, Heating & Air | 63 | 4.9★ (3,532) | Seattle | Sat · Sun · Evenings | — |
| 3 | A Advanced Septic & Construction Services | 62 | 4.8★ (2,933) | Auburn, 22 mi away | 24/7 | Emergencies |
| 4 | Fresh N Clean Septic | 62 | 4.9★ (663) | Woodinville, 15 mi away | 24/7 | — |
| 5 | Gene Johnson Plumbing | 61 | 4.8★ (4,041) | Seattle | 24/7 | Most reviews |
| 6 | Bob Oates Sewer & Rooter | 61 | 4.7★ (716) | Seattle | 24/7 | — |
| 7 | Mr. Rooter Plumbing of Seattle | 61 | 4.8★ (2,646) | Seattle | 24/7 | — |
| 8 | Knight Rooter Sewer & Drain Cleaning Services | 60 | 5.0★ (218) | Seattle | 24/7 | — |
| 9 | Raymark Plumbing & Sewer | 60 | 4.8★ (409) | Seattle | 24/7 | — |
| 10 | A Wesco Septic Services | 60 | 4.8★ (550) | Snohomish, 19 mi away | 24/7 | — |
The 158 best septic service companies in Seattle, 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 Seattle
63/100CR ScoreRanked #2 because of its Google rating and review volume: 4.9★ from 3,532 Google reviews.
Based in Auburn, 22 mi away
62/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.8★ from 2,933 Google reviews, listed on Google as “Septic system service”.
Based in Woodinville, 15 mi away
62/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.9★ from 663 Google reviews, listed on Google as “Septic system service”.
Based in Seattle
61/100CR ScoreRanked #5 because of its Google rating and review volume: 4.8★ from 4,041 Google reviews, the most in Seattle.
Based in Seattle
61/100CR ScoreRanked #6 because of its Google rating and review volume: 4.7★ from 716 Google reviews.
Based in Seattle
61/100CR ScoreRanked #7 because of its Google rating and review volume: 4.8★ from 2,646 Google reviews.
Based in Seattle
60/100CR ScoreRanked #8 because of its Google rating and trade focus: 5.0★ from 218 Google reviews, listed on Google as “Plumber”.
Based in Seattle
60/100CR ScoreRanked #9 because of its Google rating and review volume: 4.8★ from 409 Google reviews.
Based in Snohomish, 19 mi away
60/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.8★ from 550 Google reviews, listed on Google as “Septic system service”.
Based in Seattle
60/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.8★ from 251 Google reviews, listed on Google as “Plumber”.
Based in Seattle
59/100CR ScoreRanked #12 because of its Google rating and review volume: 4.5★ from 2,956 Google reviews.
Based in Bellevue, 9 mi away
59/100CR ScoreRanked #13 because of its Google rating and trade focus: 5.0★ from 316 Google reviews, listed on Google as “Plumber”.
Based in Maple Valley, 20 mi away
59/100CR ScoreRanked #14 because of its Google rating and trade focus: 5.0★ from 413 Google reviews, listed on Google as “Septic system service”.
Based in Bellevue, 10 mi away
59/100CR ScoreRanked #15 because of its Google rating and trade focus: 5.0★ from 310 Google reviews, listed on Google as “Plumber”.
Based in Seattle
59/100CR ScoreRanked #16 because of its Google rating and review volume: 4.8★ from 636 Google reviews.
Based in Lynnwood, 14 mi away
58/100CR ScoreRanked #17 because of its Google rating and review volume: 4.9★ from 781 Google reviews.
Based in Seattle
58/100CR ScoreRanked #18 because of its Google rating and trade focus: 5.0★ from 57 Google reviews, listed on Google as “Plumber”.
Based in Seattle
58/100CR ScoreRanked #19 because of its Google rating and trade focus: 4.6★ from 28 Google reviews, listed on Google as “Septic system service”.
#20 Septic Response
Based in Kirkland, 8 mi away
58/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.9★ from 213 Google reviews, listed on Google as “Plumber”.
Based in Seattle
58/100CR ScoreRanked #21 because of its Google rating and trade focus: 4.9★ from 63 Google reviews, listed on Google as “Plumber”.
Based in Snohomish, 20 mi away
58/100CR ScoreRanked #22 because of its Google rating and trade focus: 4.7★ from 229 Google reviews, listed on Google as “Septic system service”.
#23 Kitsap Septic
Based in Seattle
58/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.9★ from 136 Google reviews, listed on Google as “Septic system service”.
Based in Everett, 21 mi away
57/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.9★ from 121 Google reviews, listed on Google as “Septic system service”.
Based in SeaTac, 12 mi away
57/100CR ScoreRanked #25 because of its Google rating and review volume: 4.8★ from 2,264 Google reviews.
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 158 ranked septic service companies here; the rest are on their profiles.
Also serving Seattle
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 | In Seattle | |
| Action On-Site Services Inc | 5.0★ (1) | 18 mi |
| Benson Hill Septic Tank Services | 3.0★ (2) | 20 mi |
| Clearline Sewer Repair | 5.0★ (1) | 23 mi |
| Complete Trenchless | 4.3★ (84) | In Seattle |
| Drain Field Mechanic | 5.0★ (2) | 20 mi |
| E & R Septic & Landscaping | 5.0★ (1) | 16 mi |
| Earthwise Excavation | 5.0★ (1) | 18 mi |
| Evergreen Sanitation | 1.0★ (1) | 10 mi |
| Evergreen Sewer | 5.0★ (1) | 22 mi |
| Final Vision Inc | 5.0★ (2) | 18 mi |
| I Need A Plumber Now and Sewer Services | 5.0★ (2) | 11 mi |
| Insight Septic Design | 5.0★ (2) | 14 mi |
| Joe the Pro Plumbing, Septic, Sewer, Heating & Air | In Seattle | |
| Nathan Cleaver & Associates | 1.0★ (1) | 19 mi |
| New Horizon Sewer Services | 3.0★ (2) | 24 mi |
| Pro Flow Plumbing & Sewers | 5.0★ (2) | 25 mi |
| Seattle Septic Pros | In Seattle | |
| Sorrell Septic Design LLC | 5.0★ (2) | 14 mi |
| Wadleigh Water and Sewer | 5.0★ (2) | 22 mi |
How we ranked Seattle septic service companies
We scored 158 Seattle 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 Seattle 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 Seattle: frequently asked questions
Who is the best septic service company in Seattle?
By CR Score, the highest-ranked septic service company in Seattle, WA is Zoom Drain of Seattle with a CR Score of 66/100. It has 5.0★ from 835 Google reviews. It is open 24/7. 2 Sons Plumbing, Sewer, Septic, Electric, Heating & Air (#2) and A Advanced Septic & Construction Services (#3) follow. We ranked 158 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Seattle?
ContractorsRanked ranks 158 septic service companies serving Seattle, WA. 28 of them are based in Seattle; 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 Seattle are open 24/7?
81 ranked septic service companies in Seattle post 24/7 hours. The highest-ranked are Zoom Drain of Seattle (#1), A Advanced Septic & Construction Services (#3) and Fresh N Clean Septic (#4). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Seattle work on weekends?
122 of 158 ranked septic service companies post Saturday hours and 103 post Sunday hours. The highest-ranked open Saturdays are Zoom Drain of Seattle (#1), 2 Sons Plumbing, Sewer, Septic, Electric, Heating & Air (#2) and A Advanced Septic & Construction Services (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Seattle septic service companies have?
The median Google rating among 158 rated septic service companies in Seattle is 4.9★, with a median of 39 reviews. Gene Johnson Plumbing has the most, 4,041 reviews, and ranks #5. 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 Seattle count in this ranking?
Yes, if they are within 25 mi of the Seattle 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 Seattle
- November 2026: CR Scores recalculated for 158 septic service companies serving Seattle.
More septic service companies and Seattle pages
Septic service companies near Seattle
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