57/100CR Score
Ranked #1 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.
Best Septic Service Companies in San Anselmo, CA (2026)
38 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in San Anselmo: Dan's Plumbing & Sewer Service, CR Score 57/100; 5.0★ from 236 Google reviews.
- 4
Best for emergencies (open 24/7): Bob's underground septic, posts 24/7 hours; ranked #4 of 38.
- 2
Most-reviewed: Ace Plumbing & Rooter, Inc., 931 Google reviews at 4.9★, the most of 38 ranked; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
38 San Anselmo septic service companies are ranked here by CR Score, from ten published factors. 15 are open 24/7, 24 open Saturdays and 17 open Sundays, based on posted hours. The median Google rating is 4.9★ across 38 rated businesses.
Top 10 septic service companies in San Anselmo at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Dan's Plumbing & Sewer Service | 57 | 5.0★ (236) | San Rafael, 3 mi away | — | Overall |
| 2 | Ace Plumbing & Rooter, Inc. | 56 | 4.9★ (931) | San Francisco, 16 mi away | Sat · Sun · Evenings | Most reviews |
| 3 | El Sobrante Sewer Repair | 56 | 5.0★ (118) | El Sobrante, 16 mi away | Sat · Sun · Evenings | — |
| 4 | Bob's underground septic | 54 | 5.0★ (14) | Santa Rosa, 25 mi away | 24/7 | Emergencies |
| 5 | Isackson Plumbing | 54 | 5.0★ (74) | San Francisco, 14 mi away | 24/7 | — |
| 6 | Superior Septic Pumping Service | 54 | 4.8★ (21) | Santa Rosa, 21 mi away | Sat · Sun · Evenings | — |
| 7 | GTO. Plumbing and rooter | 54 | 4.9★ (59) | Richmond, 13 mi away | 24/7 | — |
| 8 | ABC Sewer & Drain | 53 | 4.4★ (59) | Benicia, 19 mi away | 24/7 | — |
| 9 | John Gleason Plumbing, Inc | 52 | 5.0★ (13) | Novato, 7 mi away | 24/7 | — |
| 10 | Marin H2O | 52 | 4.9★ (127) | San Rafael, 3 mi away | — | — |
The 38 best septic service companies in San Anselmo, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in San Francisco, 16 mi away
56/100CR ScoreRanked #2 because of its Google rating and review volume: 4.9★ from 931 Google reviews, the most in San Anselmo.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in El Sobrante, 16 mi away
56/100CR ScoreRanked #3 because of its Google rating and trade focus: 5.0★ from 118 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 25 mi away
54/100CR 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 San Francisco, 14 mi away
54/100CR ScoreRanked #5 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
54/100CR ScoreRanked #6 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 Richmond, 13 mi away
54/100CR ScoreRanked #7 because of its Google rating and review volume: 4.9★ from 59 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Benicia, 19 mi away
53/100CR ScoreRanked #8 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 Novato, 7 mi away
52/100CR ScoreRanked #9 because of its Google rating and availability: 5.0★ from 13 Google reviews, open 24/7.
Based on 8 of 10 factors; credentials and recency not yet collected.
#10 Marin H2O
Based in San Rafael, 3 mi away
52/100CR ScoreRanked #10 because of its Google rating and review volume: 4.9★ from 127 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Francisco, 14 mi away
52/100CR ScoreRanked #11 because of its Google rating and trade focus: 5.0★ from 8 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Alameda, 14 mi away
52/100CR ScoreRanked #12 because of its Google rating and review volume: 4.8★ from 36 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Rafael, 2 mi away
51/100CR ScoreRanked #13 because of its Google rating and availability: 4.0★ from 4 Google reviews, open 24/7.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Francisco, 17 mi away
51/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.0★ from 13 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Sonoma, 23 mi away
51/100CR ScoreRanked #15 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 South San Francisco, 24 mi away
51/100CR ScoreRanked #16 because of its Google rating and review volume: 4.6★ from 119 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Daly City, 22 mi away
51/100CR ScoreRanked #17 because of its Google rating and review volume: 5.0★ from 486 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Vallejo, 19 mi away
51/100CR ScoreRanked #18 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 Petaluma, 18 mi away
51/100CR ScoreRanked #19 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 Redwood Shores, 20 mi away
51/100CR ScoreRanked #20 because of its Google rating and trade focus: 5.0★ from 39 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Alameda, 13 mi away
50/100CR ScoreRanked #21 because of its Google rating and trade focus: 5.0★ from 12 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Richmond, 13 mi away
50/100CR ScoreRanked #22 because of its Google rating and review volume: 4.9★ from 127 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Petaluma, 21 mi away
50/100CR ScoreRanked #23 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 Santa Rosa, 25 mi away
50/100CR ScoreRanked #24 because of its Google rating and trade focus: 5.0★ from 20 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Rafael, 1 mi away
50/100CR ScoreRanked #25 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Concrete contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
All 38 septic service companies
#1 to #25 are shown in full above. Here are #26 to #38, in CR Score order; each links to its profile.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Mr Rooter Plumbing | 49 | 4.8★ (158) | 24 mi |
| 27 | United Site Services | 48 | 3.1★ (23) | 25 mi |
| 28 | Sewer Connection Inc | 48 | 4.6★ (30) | 14 mi |
| 29 | Mr Rooter Plumbing / Marin | 48 | 4.2★ (17) | 6 mi |
| 30 | Atlas Plumbing & Rooter | 48 | 5.0★ (65) | 25 mi |
| 31 | United Rentals - Reliable Onsite Services | 48 | 4.3★ (3) | 20 mi |
| 32 | AquaSaver Water Heaters | 47 | 5.0★ (5) | 20 mi |
| 33 | NS SEWER PIPING | 47 | 5.0★ (19) | 21 mi |
| 34 | The Oakland Plumber | Emergency Plumbing Service | 47 | 5.0★ (3) | 19 mi |
| 35 | JD Services | 46 | 2.9★ (23) | 25 mi |
| 36 | Sewer Master | 46 | 4.4★ (14) | 19 mi |
| 37 | Prushko Plumbing | 43 | 4.6★ (15) | 23 mi |
| 38 | Arolo Company Inc. Pump & Well | 41 | 2.6★ (17) | 19 mi |
Also serving San Anselmo
15 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 |
|---|---|---|
| American Eagle Plumbing & Construction | 5.0★ (1) | 17 mi |
| Carlos' Petaluma Septic Services | 7 mi | |
| Ernie's Plumbing & Sewer Services | 17 mi | |
| GAC Plumbing Company | 5.0★ (2) | 21 mi |
| North Bay Septic Services | 5.0★ (1) | 3 mi |
| Quick Fix Septic | 16 mi | |
| Rooterman Drain & Sewer Service | 5.0★ (2) | 20 mi |
| Roy's Sewer Services | 5.0★ (1) | 18 mi |
| Septic Services in Oakland | 20 mi | |
| Sequoia Septic Tank Services | 3 mi | |
| Sewer & Drain Masters | 11 mi | |
| Sewer Master | 21 mi | |
| Sewerinspections | 14 mi | |
| Trinity Oaks Septic Services | 5.0★ (1) | 23 mi |
| Walker Septic Services | 24 mi |
How we ranked San Anselmo septic service companies
We scored 38 San Anselmo 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 San Anselmo 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 San Anselmo: frequently asked questions
Who is the best septic service company in San Anselmo?
By CR Score, the highest-ranked septic service company in San Anselmo, CA is Dan's Plumbing & Sewer Service with a CR Score of 57/100. It has 5.0★ from 236 Google reviews. Ace Plumbing & Rooter, Inc. (#2) and El Sobrante Sewer Repair (#3) follow. We ranked 38 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in San Anselmo?
ContractorsRanked ranks 38 septic service companies serving San Anselmo, CA. Another 15 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in San Anselmo are open 24/7?
15 ranked septic service companies in San Anselmo post 24/7 hours. The highest-ranked are Bob's underground septic (#4), Isackson Plumbing (#5) and GTO. Plumbing and rooter (#7). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in San Anselmo work on weekends?
24 of 38 ranked septic service companies post Saturday hours and 17 post Sunday hours. The highest-ranked open Saturdays are Ace Plumbing & Rooter, Inc. (#2), El Sobrante Sewer Repair (#3) and Bob's underground septic (#4). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do San Anselmo septic service companies have?
The median Google rating among 38 rated septic service companies in San Anselmo is 4.9★, with a median of 22 reviews. Ace Plumbing & Rooter, Inc. has the most, 931 reviews, and ranks #2. 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 San Anselmo count in this ranking?
Yes, if they are within 25 mi of the San Anselmo 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 San Anselmo
- November 2026: CR Scores recalculated for 38 septic service companies serving San Anselmo.
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