60/100CR Score
Ranked #1 because of its Google rating and trade focus: 5.0★ from 361 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in Sonoma, CA (2026)
48 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Sonoma: American Sanitation Inc, CR Score 60/100; 5.0★ from 361 Google reviews.
- 2
Best for emergencies (open 24/7): Brian's Septic Service, posts 24/7 hours; ranked #2 of 48.
- 5
Most-reviewed: Mr. Rooter Plumbing of Sonoma County, 923 Google reviews at 4.9★, the most of 48 ranked; ranked #5.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
48 Sonoma septic service companies are ranked here by CR Score, from ten published factors. 20 are open 24/7, 30 open Saturdays and 21 open Sundays, based on posted hours. The median Google rating is 4.9★ across 48 rated businesses.
Top 10 septic service companies in Sonoma at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | American Sanitation Inc | 60 | 5.0★ (361) | Napa, 9 mi away | — | Overall |
| 2 | Brian's Septic Service | 59 | 5.0★ (104) | Santa Rosa, 21 mi away | 24/7 | Emergencies |
| 3 | AllStarz Pumping & Engineering | 59 | 4.7★ (127) | Santa Rosa, 18 mi away | 24/7 | — |
| 4 | Bob's underground septic | 58 | 5.0★ (14) | Santa Rosa, 9 mi away | 24/7 | — |
| 5 | Mr. Rooter Plumbing of Sonoma County | 57 | 4.9★ (923) | Santa Rosa, 18 mi away | 24/7 | Most reviews |
| 6 | Redwood Sewer & Drain Services | 57 | 5.0★ (163) | Larkfield-Wikiup, 18 mi away | 24/7 | — |
| 7 | Superior Septic Pumping Service | 57 | 4.8★ (21) | Santa Rosa, 9 mi away | Sat · Sun · Evenings | — |
| 8 | Apes Plumbing Heating Sewer and Drain Services | 57 | 4.9★ (90) | Sonoma | Sat | — |
| 9 | Mr. Rooter Plumbing of Contra Costa County | 55 | 4.8★ (265) | Fairfield, 18 mi away | 24/7 | — |
| 10 | Northen Sewer & Drain | 55 | 5.0★ (13) | Santa Rosa, 23 mi away | 24/7 | — |
The 48 best septic service companies in Sonoma, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Santa Rosa, 21 mi away
59/100CR ScoreRanked #2 because of its Google rating and trade focus: 5.0★ from 104 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 18 mi away
59/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.7★ from 127 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 9 mi away
58/100CR ScoreRanked #4 because of its Google rating and trade focus: 5.0★ from 14 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 18 mi away
57/100CR ScoreRanked #5 because of its Google rating and review volume: 4.9★ from 923 Google reviews, the most in Sonoma.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Larkfield-Wikiup, 18 mi away
57/100CR ScoreRanked #6 because of its Google rating and review volume: 5.0★ from 163 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 9 mi away
57/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.8★ from 21 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Sonoma
57/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.9★ from 90 Google reviews, listed on Google as “Air conditioning contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Fairfield, 18 mi away
55/100CR ScoreRanked #9 because of its Google rating and review volume: 4.8★ from 265 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 23 mi away
55/100CR ScoreRanked #10 because of its Google rating and trade focus: 5.0★ from 13 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Benicia, 13 mi away
54/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.4★ from 59 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 18 mi away
54/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.2★ from 5 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 22 mi away
54/100CR ScoreRanked #13 because of its Google rating and trade focus: 5.0★ from 103 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 16 mi away
54/100CR ScoreRanked #14 because of its Google rating and review volume: 4.9★ from 90 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Petaluma, 11 mi away
53/100CR ScoreRanked #15 because of its Google rating and trade focus: 3.5★ from 11 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Santa Rosa, 20 mi away
53/100CR ScoreRanked #16 because of its Google rating and trade focus: 5.0★ from 22 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 19 mi away
53/100CR ScoreRanked #17 because of its Google rating and trade focus: 5.0★ from 18 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Petaluma, 10 mi away
53/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.4★ from 7 Google reviews, listed on Google as “Contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Sebastopol, 23 mi away
52/100CR ScoreRanked #19 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Napa, 12 mi away
52/100CR ScoreRanked #20 because of its Google rating and review volume: 4.8★ from 158 Google reviews.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Napa, 9 mi away
52/100CR ScoreRanked #21 because of its Google rating and review volume: 5.0★ from 74 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 21 mi away
52/100CR ScoreRanked #22 because of its Google rating and review volume: 5.0★ from 281 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Rafael, 23 mi away
51/100CR ScoreRanked #23 because of its Google rating and review volume: 5.0★ from 236 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Vallejo, 16 mi away
51/100CR ScoreRanked #24 because of its Google rating and review volume: 4.5★ from 57 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Napa, 10 mi away
51/100CR ScoreRanked #25 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
All 48 septic service companies
#1 to #25 are shown in full above. Here are #26 to #48, in CR Score order; each links to its profile.
Also serving Sonoma
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 |
|---|---|---|
| Accredited Septic | 21 mi | |
| Campi Engineering | 5.0★ (2) | 21 mi |
| Carlos' Petaluma Septic Services | 16 mi | |
| Drew Underground Construction Inc | 20 mi | |
| GAC Plumbing Company | 5.0★ (2) | 12 mi |
| GAC Plumbing Company (Rohnert Park) | 14 mi | |
| Jaw Excavation | 5.0★ (1) | 18 mi |
| Mike Treinen-Onsite Wastewater | 10 mi | |
| North Bay Septic Services | 5.0★ (1) | 23 mi |
| Northen Sewer & Drain | 5.0★ (1) | 14 mi |
| P&M Excavating, Inc. | 21 mi | |
| Rapid Rooter Sewer-Drain Cleaning | 14 mi | |
| Rooterman Drain & Sewer Service | 5.0★ (2) | 18 mi |
| Roy's Sewer Services | 5.0★ (1) | 11 mi |
| Sequoia Septic Tank Service | 5.0★ (1) | 16 mi |
| Sewer Master | 17 mi | |
| Trinity Oaks Septic Services | 5.0★ (1) | In Sonoma |
| Vineyard Septic | 5.0★ (1) | 13 mi |
| Walker Septic Services | In Sonoma | |
| West County Septic | 15 mi |
How we ranked Sonoma septic service companies
We scored 48 Sonoma 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 Sonoma 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 Sonoma: frequently asked questions
Who is the best septic service company in Sonoma?
By CR Score, the highest-ranked septic service company in Sonoma, CA is American Sanitation Inc with a CR Score of 60/100. It has 5.0★ from 361 Google reviews. Brian's Septic Service (#2) and AllStarz Pumping & Engineering (#3) follow. We ranked 48 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Sonoma?
ContractorsRanked ranks 48 septic service companies serving Sonoma, CA. 2 of them are based in Sonoma; 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 Sonoma are open 24/7?
20 ranked septic service companies in Sonoma post 24/7 hours. The highest-ranked are Brian's Septic Service (#2), AllStarz Pumping & Engineering (#3) and Bob's underground septic (#4). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Sonoma work on weekends?
30 of 48 ranked septic service companies post Saturday hours and 21 post Sunday hours. The highest-ranked open Saturdays are Brian's Septic Service (#2), AllStarz Pumping & Engineering (#3) and Bob's underground septic (#4). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Sonoma septic service companies have?
The median Google rating among 48 rated septic service companies in Sonoma is 4.9★, with a median of 19 reviews. Mr. Rooter Plumbing of Sonoma County has the most, 923 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 Sonoma count in this ranking?
Yes, if they are within 25 mi of the Sonoma 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 Sonoma
- November 2026: CR Scores recalculated for 48 septic service companies serving Sonoma.
More septic service companies and Sonoma pages
Septic service companies near Sonoma
- Septic service companies in Napa, CA32 ranked
- Septic service companies in Petaluma, CA51 ranked
- Septic service companies in American Canyon, CA35 ranked
- Septic service companies in Rohnert Park, CA48 ranked
- Septic service companies in Novato, CA47 ranked
- Septic service companies in Vallejo, CA41 ranked
- Septic service companies in Santa Rosa, CA42 ranked
- Septic service companies in Hercules, CA44 ranked
- Septic service companies in Pinole, CA46 ranked
- Septic service companies in San Rafael, CA38 ranked
Other trades in Sonoma
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- All contractors in Sonoma