62/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.8★ from 2,933 Google reviews, listed on Google as “Septic system service”.
Best Septic Service Companies in Issaquah, WA (2026)
138 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Issaquah: A Advanced Septic & Construction Services, CR Score 62/100; 4.8★ from 2,933 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Zoom Drain of Seattle, posts 24/7 hours; ranked #2 of 138.
- 19
Most-reviewed: Gene Johnson Plumbing, 4,041 Google reviews at 4.8★, the most of 138 ranked; ranked #19.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
138 Issaquah septic service companies are ranked here by CR Score, from ten published factors. 73 are open 24/7, 107 open Saturdays and 93 open Sundays, based on posted hours. The median Google rating is 4.9★ across 138 rated businesses.
Top 10 septic service companies in Issaquah at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | A Advanced Septic & Construction Services | 62 | 4.8★ (2,933) | Auburn, 19 mi away | 24/7 | Overall |
| 2 | Zoom Drain of Seattle | 62 | 5.0★ (835) | Seattle, 19 mi away | 24/7 | Emergencies |
| 3 | Fresh N Clean Septic | 61 | 4.9★ (663) | Woodinville, 16 mi away | 24/7 | — |
| 4 | Puget Sound Septic | 61 | 5.0★ (413) | Maple Valley, 10 mi away | Sat · Sun · Evenings | — |
| 5 | American Rooter Sewer & Drain Service LLC | 59 | 5.0★ (316) | Bellevue, 7 mi away | 24/7 | — |
| 6 | A Wesco Septic Services | 59 | 4.8★ (550) | Snohomish, 22 mi away | 24/7 | — |
| 7 | Washington Rooter Sewer & Drain Service LLC | 59 | 5.0★ (310) | Bellevue, 8 mi away | 24/7 | — |
| 8 | Eastside Plumbing, Sewer, Septic, Electric, Heating & Air - Issaquah | 59 | 4.9★ (98) | Issaquah | 24/7 | — |
| 9 | 2 Sons Plumbing, Sewer, Septic, Electric, Heating & Air | 58 | 4.9★ (3,532) | Seattle, 19 mi away | Sat · Sun · Evenings | — |
| 10 | McNel Septic Service | 58 | 4.9★ (144) | Kent, 1 mi away | — | — |
The 138 best septic service companies in Issaquah, 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, 19 mi away
62/100CR ScoreRanked #2 because of its Google rating and trade focus: 5.0★ from 835 Google reviews, listed on Google as “Septic system service”.
Based in Woodinville, 16 mi away
61/100CR 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 Maple Valley, 10 mi away
61/100CR ScoreRanked #4 because of its Google rating and trade focus: 5.0★ from 413 Google reviews, listed on Google as “Septic system service”.
Based in Bellevue, 7 mi away
59/100CR ScoreRanked #5 because of its Google rating and trade focus: 5.0★ from 316 Google reviews, listed on Google as “Plumber”.
Based in Snohomish, 22 mi away
59/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.8★ from 550 Google reviews, listed on Google as “Septic system service”.
Based in Bellevue, 8 mi away
59/100CR ScoreRanked #7 because of its Google rating and trade focus: 5.0★ from 310 Google reviews, listed on Google as “Plumber”.
Based in Issaquah
59/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.9★ from 98 Google reviews, listed on Google as “Plumber”.
Based in Seattle, 19 mi away
58/100CR ScoreRanked #9 because of its Google rating and review volume: 4.9★ from 3,532 Google reviews.
Based in Kent, 1 mi away
58/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.9★ from 144 Google reviews, listed on Google as “Septic system service”.
Based in Seattle, 13 mi away
57/100CR ScoreRanked #11 because of its Google rating and review volume: 4.8★ from 2,646 Google reviews.
Based in Kent, 12 mi away
57/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.6★ from 169 Google reviews, listed on Google as “Septic system service”.
Based in Seattle, 4 mi away
57/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.6★ from 28 Google reviews, listed on Google as “Septic system service”.
Based in Camano, 11 mi away
57/100CR ScoreRanked #14 because of its Google rating and trade focus: 5.0★ from 45 Google reviews, listed on Google as “Septic system service”.
Based in Snohomish, 23 mi away
57/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.7★ from 229 Google reviews, listed on Google as “Septic system service”.
#16 Inspection Boss
Based in Everett, 10 mi away
57/100CR ScoreRanked #16 because of its Google rating and trade focus: 5.0★ from 33 Google reviews, listed on Google as “Septic system service”.
Based in SeaTac, 15 mi away
57/100CR ScoreRanked #17 because of its Google rating and review volume: 4.8★ from 2,264 Google reviews.
#18 Septic Response
Based in Kirkland, 13 mi away
57/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.9★ from 213 Google reviews, listed on Google as “Plumber”.
Based in Seattle, 19 mi away
57/100CR ScoreRanked #19 because of its Google rating and review volume: 4.8★ from 4,041 Google reviews, the most in Issaquah.
Based in Seattle, 17 mi away
56/100CR ScoreRanked #20 because of its Google rating and review volume: 4.7★ from 716 Google reviews.
Based in City of Sammamish, 7 mi away
56/100CR ScoreRanked #21 because of its Google rating and review volume: 5.0★ from 268 Google reviews.
Based in Tukwila, 12 mi away
56/100CR ScoreRanked #22 because of its Google rating and review volume: 4.8★ from 579 Google reviews.
Based in Kent, 11 mi away
56/100CR ScoreRanked #23 because of its Google rating and review volume: 4.7★ from 1,362 Google reviews.
Based in Kent, 14 mi away
56/100CR ScoreRanked #24 because of its Google rating and review volume: 4.9★ from 540 Google reviews.
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 138 ranked septic service companies here; the rest are on their profiles.
Also serving Issaquah
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 | 15 mi | |
| Benson Hill Septic Tank Services | 3.0★ (2) | 20 mi |
| Clearline Sewer Repair | 5.0★ (1) | 21 mi |
| CLS Septics & Electrical | 5.0★ (1) | 12 mi |
| Cole Septic | 5.0★ (1) | 19 mi |
| DELTA ROOTER LLC | 12 mi | |
| Earthwise Excavation | 5.0★ (1) | 20 mi |
| Evergreen Sanitation | 1.0★ (1) | 9 mi |
| Evergreen Sewer | 5.0★ (1) | 12 mi |
| Gravity Sewer Repair | 13 mi | |
| I Need A Plumber Now and Sewer Services | 5.0★ (2) | 7 mi |
| Insight Septic Design | 5.0★ (2) | 8 mi |
| Joe the Pro Plumbing, Septic, Sewer, Heating & Air | 16 mi | |
| Milton Construction Inc | 13 mi | |
| Neighbor's Sno-Valley Septic | 12 mi | |
| Northrup Construction Inc | 5.0★ (1) | 25 mi |
| Paulson Septic Design | 13 mi | |
| Seattle Septic Pros | 15 mi | |
| Sorrell Septic Design LLC | 5.0★ (2) | 2 mi |
| Wadleigh Water and Sewer | 5.0★ (2) | 7 mi |
How we ranked Issaquah septic service companies
We scored 138 Issaquah 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 Issaquah 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 Issaquah: frequently asked questions
Who is the best septic service company in Issaquah?
By CR Score, the highest-ranked septic service company in Issaquah, WA is A Advanced Septic & Construction Services with a CR Score of 62/100. It has 4.8★ from 2,933 Google reviews. It is open 24/7. Zoom Drain of Seattle (#2) and Fresh N Clean Septic (#3) follow. We ranked 138 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Issaquah?
ContractorsRanked ranks 138 septic service companies serving Issaquah, WA. 1 of them is based in Issaquah; 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 Issaquah are open 24/7?
73 ranked septic service companies in Issaquah post 24/7 hours. The highest-ranked are A Advanced Septic & Construction Services (#1), Zoom Drain of Seattle (#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 Issaquah work on weekends?
107 of 138 ranked septic service companies post Saturday hours and 93 post Sunday hours. The highest-ranked open Saturdays are A Advanced Septic & Construction Services (#1), Zoom Drain of Seattle (#2) and Fresh N Clean Septic (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Issaquah septic service companies have?
The median Google rating among 138 rated septic service companies in Issaquah is 4.9★, with a median of 38 reviews. Gene Johnson Plumbing has the most, 4,041 reviews, and ranks #19. 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 Issaquah count in this ranking?
Yes, if they are within 25 mi of the Issaquah 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 Issaquah
- November 2026: CR Scores recalculated for 138 septic service companies serving Issaquah.
More septic service companies and Issaquah pages
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Other trades in Issaquah
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- All contractors in Issaquah