64/100CR 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 Mercer Island, WA (2026)
163 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Mercer Island: Zoom Drain of Seattle, CR Score 64/100; 5.0★ from 835 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): A Advanced Septic & Construction Services, posts 24/7 hours; ranked #2 of 163.
- 11
Most-reviewed: Gene Johnson Plumbing, 4,041 Google reviews at 4.8★, the most of 163 ranked; ranked #11.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
163 Mercer Island septic service companies are ranked here by CR Score, from ten published factors. 84 are open 24/7, 124 open Saturdays and 106 open Sundays, based on posted hours. The median Google rating is 4.9★ across 163 rated businesses.
Top 10 septic service companies in Mercer Island at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Zoom Drain of Seattle | 64 | 5.0★ (835) | Seattle, 11 mi away | 24/7 | Overall |
| 2 | A Advanced Septic & Construction Services | 62 | 4.8★ (2,933) | Auburn, 19 mi away | 24/7 | Emergencies |
| 3 | Fresh N Clean Septic | 62 | 4.9★ (663) | Woodinville, 14 mi away | 24/7 | — |
| 4 | 2 Sons Plumbing, Sewer, Septic, Electric, Heating & Air | 60 | 4.9★ (3,532) | Seattle, 10 mi away | Sat · Sun · Evenings | — |
| 5 | American Rooter Sewer & Drain Service LLC | 60 | 5.0★ (316) | Bellevue, 4 mi away | 24/7 | — |
| 6 | Puget Sound Septic | 60 | 5.0★ (413) | Maple Valley, 15 mi away | Sat · Sun · Evenings | — |
| 7 | A Wesco Septic Services | 60 | 4.8★ (550) | Snohomish, 20 mi away | 24/7 | — |
| 8 | Washington Rooter Sewer & Drain Service LLC | 60 | 5.0★ (310) | Bellevue, 6 mi away | 24/7 | — |
| 9 | Mr. Rooter Plumbing of Seattle | 59 | 4.8★ (2,646) | Seattle, 6 mi away | 24/7 | — |
| 10 | Bob Oates Sewer & Rooter | 59 | 4.7★ (716) | Seattle, 8 mi away | 24/7 | — |
The 163 best septic service companies in Mercer Island, 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 Auburn, 19 mi away
62/100CR ScoreRanked #2 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, 14 mi away
62/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.9★ from 663 Google reviews, listed on Google as “Septic system service”.
Based in Seattle, 10 mi away
60/100CR ScoreRanked #4 because of its Google rating and review volume: 4.9★ from 3,532 Google reviews.
Based in Bellevue, 4 mi away
60/100CR ScoreRanked #5 because of its Google rating and trade focus: 5.0★ from 316 Google reviews, listed on Google as “Plumber”.
Based in Maple Valley, 15 mi away
60/100CR ScoreRanked #6 because of its Google rating and trade focus: 5.0★ from 413 Google reviews, listed on Google as “Septic system service”.
Based in Snohomish, 20 mi away
60/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.8★ from 550 Google reviews, listed on Google as “Septic system service”.
Based in Bellevue, 6 mi away
60/100CR ScoreRanked #8 because of its Google rating and trade focus: 5.0★ from 310 Google reviews, listed on Google as “Plumber”.
Based in Seattle, 6 mi away
59/100CR ScoreRanked #9 because of its Google rating and review volume: 4.8★ from 2,646 Google reviews.
Based in Seattle, 8 mi away
59/100CR ScoreRanked #10 because of its Google rating and review volume: 4.7★ from 716 Google reviews.
Based in Seattle, 11 mi away
59/100CR ScoreRanked #11 because of its Google rating and review volume: 4.8★ from 4,041 Google reviews, the most in Mercer Island.
#12 Septic Response
Based in Kirkland, 8 mi away
58/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.9★ from 213 Google reviews, listed on Google as “Plumber”.
Based in Seattle, 10 mi away
58/100CR ScoreRanked #13 because of its Google rating and trade focus: 5.0★ from 218 Google reviews, listed on Google as “Plumber”.
Based in Seattle, 10 mi away
58/100CR ScoreRanked #14 because of its Google rating and review volume: 4.8★ from 409 Google reviews.
Based in Seattle, 5 mi away
58/100CR ScoreRanked #15 because of its Google rating and review volume: 4.5★ from 2,956 Google reviews.
Based in SeaTac, 11 mi away
58/100CR ScoreRanked #16 because of its Google rating and review volume: 4.8★ from 2,264 Google reviews.
Based in Tukwila, 6 mi away
58/100CR ScoreRanked #17 because of its Google rating and review volume: 4.8★ from 579 Google reviews.
Based in Snohomish, 20 mi away
58/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.7★ from 229 Google reviews, listed on Google as “Septic system service”.
Based in Lynnwood, 17 mi away
58/100CR ScoreRanked #19 because of its Google rating and review volume: 4.9★ from 781 Google reviews.
Based in Everett, 23 mi away
57/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.9★ from 121 Google reviews, listed on Google as “Septic system service”.
Based in Kent, 13 mi away
57/100CR ScoreRanked #21 because of its Google rating and trade focus: 4.6★ from 169 Google reviews, listed on Google as “Septic system service”.
Based in Kent, 10 mi away
57/100CR ScoreRanked #22 because of its Google rating and review volume: 4.7★ from 1,362 Google reviews.
Based in Seattle, 13 mi away
57/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.8★ from 251 Google reviews, listed on Google as “Plumber”.
Based in Issaquah, 9 mi away
56/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.9★ from 98 Google reviews, listed on Google as “Plumber”.
Based in Kent, 14 mi away
56/100CR ScoreRanked #25 because of its Google rating and trade focus: 5.0★ from 145 Google reviews, listed on Google as “Plumber”.
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 163 ranked septic service companies here; the rest are on their profiles.
Also serving Mercer Island
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 | 5 mi | |
| Action On-Site Services Inc | 5.0★ (1) | 22 mi |
| Benson Hill Septic Tank Services | 3.0★ (2) | 18 mi |
| Clearline Sewer Repair | 5.0★ (1) | 22 mi |
| CLS Septics & Electrical | 5.0★ (1) | 19 mi |
| E & R Septic & Landscaping | 5.0★ (1) | 21 mi |
| Earthwise Excavation | 5.0★ (1) | 18 mi |
| Evergreen Sanitation | 1.0★ (1) | 7 mi |
| Evergreen Sewer | 5.0★ (1) | 17 mi |
| Final Vision Inc | 5.0★ (2) | 22 mi |
| Gravity Sewer Repair | 9 mi | |
| I Need A Plumber Now and Sewer Services | 5.0★ (2) | 6 mi |
| Insight Septic Design | 5.0★ (2) | 9 mi |
| Joe the Pro Plumbing, Septic, Sewer, Heating & Air | 8 mi | |
| Nathan Cleaver & Associates | 1.0★ (1) | 24 mi |
| New Horizon Sewer Services | 3.0★ (2) | 24 mi |
| Raven Rooter Sewer & Drain Cleaning Tacoma | 4.0★ (1) | 24 mi |
| Seattle Septic Pros | 6 mi | |
| Sorrell Septic Design LLC | 5.0★ (2) | 9 mi |
| Wadleigh Water and Sewer | 5.0★ (2) | 16 mi |
How we ranked Mercer Island septic service companies
We scored 163 Mercer Island 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 Mercer Island 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 Mercer Island: frequently asked questions
Who is the best septic service company in Mercer Island?
By CR Score, the highest-ranked septic service company in Mercer Island, WA is Zoom Drain of Seattle with a CR Score of 64/100. It has 5.0★ from 835 Google reviews. It is open 24/7. A Advanced Septic & Construction Services (#2) and Fresh N Clean Septic (#3) follow. We ranked 163 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Mercer Island?
ContractorsRanked ranks 163 septic service companies serving Mercer Island, WA. Another 20 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Mercer Island are open 24/7?
84 ranked septic service companies in Mercer Island post 24/7 hours. The highest-ranked are Zoom Drain of Seattle (#1), A Advanced Septic & Construction Services (#2) and Fresh N Clean Septic (#3). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Mercer Island work on weekends?
124 of 163 ranked septic service companies post Saturday hours and 106 post Sunday hours. The highest-ranked open Saturdays are Zoom Drain of Seattle (#1), A Advanced Septic & Construction Services (#2) and Fresh N Clean Septic (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Mercer Island septic service companies have?
The median Google rating among 163 rated septic service companies in Mercer Island is 4.9★, with a median of 38 reviews. Gene Johnson Plumbing has the most, 4,041 reviews, and ranks #11. 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 Mercer Island count in this ranking?
Yes, if they are within 25 mi of the Mercer Island 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 Mercer Island
- November 2026: CR Scores recalculated for 163 septic service companies serving Mercer Island.
More septic service companies and Mercer Island pages
Septic service companies near Mercer Island
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Other trades in Mercer Island
- Roofers in Mercer Island1173 ranked
- Plumbers in Mercer Island650 ranked
- Electricians in Mercer Island574 ranked
- HVAC contractors in Mercer Island585 ranked
- General contractors in Mercer Island1611 ranked
- Painters in Mercer Island533 ranked
- Landscapers in Mercer Island386 ranked
- Handymen in Mercer Island206 ranked
- Kitchen remodelers in Mercer Island813 ranked
- Bathroom remodelers in Mercer Island798 ranked
- Flooring contractors in Mercer Island521 ranked
- Tile installers in Mercer Island157 ranked
- Drywall contractors in Mercer Island44 ranked
- Concrete contractors in Mercer Island331 ranked
- Fence contractors in Mercer Island313 ranked
- Deck builders in Mercer Island484 ranked
- Siding contractors in Mercer Island369 ranked
- Window installers in Mercer Island390 ranked
- Gutter installers in Mercer Island454 ranked
- Insulation contractors in Mercer Island175 ranked
- Solar installers in Mercer Island75 ranked
- Garage door repair companies in Mercer Island249 ranked
- Foundation repair companies in Mercer Island137 ranked
- Tree services in Mercer Island332 ranked
- Masonry contractors in Mercer Island208 ranked
- Water damage restoration companies in Mercer Island518 ranked
- Home builders in Mercer Island629 ranked
- Demolition contractors in Mercer Island126 ranked
- Window cleaners in Mercer Island163 ranked
- Pressure washing companies in Mercer Island243 ranked
- Pest control companies in Mercer Island170 ranked
- Paving contractors in Mercer Island208 ranked
- Auto glass repair shops in Mercer Island181 ranked
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- Pool builders in Mercer Island51 ranked
- All contractors in Mercer Island