56/100CR Score
Ranked #1 because of its Google rating and review volume: 4.9★ from 931 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in Mill Valley, CA (2026)
36 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Mill Valley: Ace Plumbing & Rooter, Inc., CR Score 56/100; 4.9★ from 931 Google reviews; open 7 days a week.
- 5
Best for emergencies (open 24/7): Isackson Plumbing, posts 24/7 hours; ranked #5 of 36.
- 4
Most-reviewed: Caccia Home Services, 1,910 Google reviews at 4.9★, the most of 36 ranked; ranked #4.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
36 Mill Valley septic service companies are ranked here by CR Score, from ten published factors. 16 are open 24/7, 24 open Saturdays and 19 open Sundays, based on posted hours. The median Google rating is 4.9★ across 36 rated businesses.
Top 10 septic service companies in Mill Valley at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Ace Plumbing & Rooter, Inc. | 56 | 4.9★ (931) | San Francisco, 12 mi away | Sat · Sun · Evenings | Overall |
| 2 | Dan's Plumbing & Sewer Service | 55 | 5.0★ (236) | San Rafael, 4 mi away | — | — |
| 3 | El Sobrante Sewer Repair | 55 | 5.0★ (118) | El Sobrante, 15 mi away | Sat · Sun · Evenings | — |
| 4 | Caccia Home Services | 55 | 4.9★ (1,910) | Burlingame, 23 mi away | Sat · Sun · Evenings | Most reviews |
| 5 | Isackson Plumbing | 54 | 5.0★ (74) | San Francisco, 10 mi away | 24/7 | Emergencies |
| 6 | GTO. Plumbing and rooter | 53 | 4.9★ (59) | Richmond, 12 mi away | 24/7 | — |
| 7 | Precision Flow Plumbing - Sewer Line Replacement | 53 | 5.0★ (8) | San Francisco, 10 mi away | 24/7 | — |
| 8 | Rooter Hero Plumbing & Air of San Leandro | 53 | 4.8★ (36) | Alameda, 9 mi away | 24/7 | — |
| 9 | Economy Plumbing Sewer And Drain | 52 | 4.0★ (13) | San Francisco, 12 mi away | 24/7 | — |
| 10 | ABC Sewer & Drain | 51 | 4.4★ (59) | Benicia, 22 mi away | 24/7 | — |
The 36 best septic service companies in Mill Valley, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in San Rafael, 4 mi away
55/100CR ScoreRanked #2 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 El Sobrante, 15 mi away
55/100CR 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 Burlingame, 23 mi away
55/100CR ScoreRanked #4 because of its Google rating and review volume: 4.9★ from 1,910 Google reviews, the most in Mill Valley.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Francisco, 10 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 Richmond, 12 mi away
53/100CR ScoreRanked #6 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 San Francisco, 10 mi away
53/100CR ScoreRanked #7 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, 9 mi away
53/100CR ScoreRanked #8 because of its Google rating and availability: 4.8★ from 36 Google reviews, open 24/7.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Francisco, 12 mi away
52/100CR ScoreRanked #9 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 Benicia, 22 mi away
51/100CR ScoreRanked #10 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 South San Francisco, 19 mi away
51/100CR ScoreRanked #11 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 Redwood Shores, 16 mi away
51/100CR ScoreRanked #12 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 Novato, 11 mi away
51/100CR ScoreRanked #13 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.
Based in Daly City, 17 mi away
51/100CR ScoreRanked #14 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 Alameda, 9 mi away
51/100CR ScoreRanked #15 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.
#16 Marin H2O
Based in San Rafael, 8 mi away
50/100CR ScoreRanked #16 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 Rafael, 6 mi away
50/100CR ScoreRanked #17 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 Alamo, 25 mi away
49/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.2★ from 24 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Vallejo, 21 mi away
49/100CR ScoreRanked #19 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 Richmond, 12 mi away
49/100CR ScoreRanked #20 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, 23 mi away
49/100CR ScoreRanked #21 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 Oakland, 21 mi away
49/100CR ScoreRanked #22 because of its Google rating and trade focus: 3.1★ from 23 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Bruno, 20 mi away
48/100CR ScoreRanked #23 because of its Google rating and review volume: 5.0★ from 65 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Albany, 16 mi away
48/100CR ScoreRanked #24 because of its Google rating and availability: 5.0★ from 5 Google reviews, open 24/7.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Rafael, 6 mi away
48/100CR 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 36 septic service companies
#1 to #25 are shown in full above. Here are #26 to #36, in CR Score order; each links to its profile.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Albion Plumbing Rooter Inc - Plumber in Alameda, CA | 48 | 4.8★ (17) | 23 mi |
| 27 | Sewer Connection Inc | 48 | 4.6★ (30) | 14 mi |
| 28 | The Oakland Plumber | Emergency Plumbing Service | 48 | 5.0★ (3) | 16 mi |
| 29 | United Rentals - Reliable Onsite Services | 47 | 4.3★ (3) | 22 mi |
| 30 | Mr Rooter Plumbing / Marin | 47 | 4.2★ (17) | 11 mi |
| 31 | JD Services | 47 | 2.9★ (23) | 21 mi |
| 32 | Total Underground Construction | 46 | 5.0★ (6) | 24 mi |
| 33 | Sewer Master | 46 | 4.4★ (14) | 16 mi |
| 34 | Rescue Rooter | 46 | 3.7★ (18) | 24 mi |
| 35 | NS SEWER PIPING | 46 | 5.0★ (19) | 23 mi |
| 36 | Arolo Company Inc. Pump & Well | 39 | 2.6★ (17) | 23 mi |
Also serving Mill Valley
13 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 | 11 mi | |
| Ernie's Plumbing & Sewer Services | 17 mi | |
| North Bay Septic Services | 5.0★ (1) | 5 mi |
| Quick Fix Septic | 12 mi | |
| Rooterman Drain & Sewer Service | 5.0★ (2) | 22 mi |
| Roy's Sewer Services | 5.0★ (1) | 23 mi |
| Septic Services in Oakland | 16 mi | |
| Sequoia Septic Tank Services | 5 mi | |
| Sewer & Drain Masters | 11 mi | |
| Sewer Master | 23 mi | |
| Sewer Rat Plumbing | 24 mi | |
| Sewerinspections | 15 mi |
How we ranked Mill Valley septic service companies
We scored 36 Mill Valley 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 Mill Valley 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 Mill Valley: frequently asked questions
Who is the best septic service company in Mill Valley?
By CR Score, the highest-ranked septic service company in Mill Valley, CA is Ace Plumbing & Rooter, Inc. with a CR Score of 56/100. It has 4.9★ from 931 Google reviews. It is open 7 days a week. Dan's Plumbing & Sewer Service (#2) and El Sobrante Sewer Repair (#3) follow. We ranked 36 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Mill Valley?
ContractorsRanked ranks 36 septic service companies serving Mill Valley, CA. Another 13 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Mill Valley are open 24/7?
16 ranked septic service companies in Mill Valley post 24/7 hours. The highest-ranked are Isackson Plumbing (#5), GTO. Plumbing and rooter (#6) and Precision Flow Plumbing - Sewer Line Replacement (#7). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Mill Valley work on weekends?
24 of 36 ranked septic service companies post Saturday hours and 19 post Sunday hours. The highest-ranked open Saturdays are Ace Plumbing & Rooter, Inc. (#1), El Sobrante Sewer Repair (#3) and Caccia Home Services (#4). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Mill Valley septic service companies have?
The median Google rating among 36 rated septic service companies in Mill Valley is 4.9★, with a median of 23 reviews. Caccia Home Services has the most, 1,910 reviews, and ranks #4. 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 Mill Valley count in this ranking?
Yes, if they are within 25 mi of the Mill Valley 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 Mill Valley
- November 2026: CR Scores recalculated for 36 septic service companies serving Mill Valley.
More septic service companies and Mill Valley pages
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