63/100CR 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 Napa, CA (2026)
32 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Napa: American Sanitation Inc, CR Score 63/100; 5.0★ from 361 Google reviews.
- 2
Best for emergencies (open 24/7): Mr. Rooter Plumbing of Contra Costa County, posts 24/7 hours; ranked #2 of 32.
- 13
Most-reviewed: Gray Plumbing Inc, 380 Google reviews at 4.7★, the most of 32 ranked; ranked #13.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
32 Napa septic service companies are ranked here by CR Score, from ten published factors. 11 are open 24/7, 16 open Saturdays and 13 open Sundays, based on posted hours. The median Google rating is 4.8★ across 32 rated businesses.
Top 10 septic service companies in Napa at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | American Sanitation Inc | 63 | 5.0★ (361) | Napa | — | Overall |
| 2 | Mr. Rooter Plumbing of Contra Costa County | 58 | 4.8★ (265) | Fairfield, 10 mi away | 24/7 | Emergencies |
| 3 | Mr Rooter Plumbing | 57 | 4.8★ (158) | Napa | — | — |
| 4 | Bob's underground septic | 56 | 5.0★ (14) | Santa Rosa, 18 mi away | 24/7 | — |
| 5 | ABC Sewer & Drain | 56 | 4.4★ (59) | Benicia, 10 mi away | 24/7 | — |
| 6 | AAA Organized Plumbing - Napa | 55 | 5.0★ (74) | Napa | Sat · Evenings | — |
| 7 | Superior Septic Pumping Service | 55 | 4.8★ (21) | Santa Rosa, 18 mi away | Sat · Sun · Evenings | — |
| 8 | Apes Plumbing Heating Sewer and Drain Services | 55 | 4.9★ (90) | Sonoma, 11 mi away | Sat | — |
| 9 | El Sobrante Sewer Repair | 55 | 5.0★ (118) | El Sobrante, 24 mi away | Sat · Sun · Evenings | — |
| 10 | Napa Septic Tank Service, Inc. | 53 | 5.0★ (5) | Napa | — | — |
The 32 best septic service companies in Napa, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Fairfield, 10 mi away
58/100CR ScoreRanked #2 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 Napa
57/100CR ScoreRanked #3 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 Santa Rosa, 18 mi away
56/100CR 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 Benicia, 10 mi away
56/100CR ScoreRanked #5 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 Napa
55/100CR ScoreRanked #6 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, 18 mi away
55/100CR 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, 11 mi away
55/100CR ScoreRanked #8 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 El Sobrante, 24 mi away
55/100CR ScoreRanked #9 because of its Google rating and review volume: 5.0★ from 118 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Napa
53/100CR ScoreRanked #10 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.
Based in Vallejo, 13 mi away
53/100CR ScoreRanked #11 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 Santa Rosa, 24 mi away
52/100CR ScoreRanked #12 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 Fairfield, 13 mi away
52/100CR ScoreRanked #13 because of its Google rating and review volume: 4.7★ from 380 Google reviews, the most in Napa.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Petaluma, 20 mi away
51/100CR ScoreRanked #14 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 Petaluma, 20 mi away
50/100CR ScoreRanked #15 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 Vacaville, 20 mi away
50/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.7★ from 7 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Vallejo, 11 mi away
50/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.3★ from 3 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#18 NS SEWER PIPING
Based in Vallejo, 12 mi away
50/100CR ScoreRanked #18 because of its Google rating and trade focus: 5.0★ from 19 Google reviews, listed on Google as “General contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Novato, 21 mi away
49/100CR ScoreRanked #19 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 Fairfield, 14 mi away
49/100CR ScoreRanked #20 because of its Google rating and review volume: 4.8★ from 25 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Larkfield-Wikiup, 23 mi away
49/100CR ScoreRanked #21 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#22 Septic genial
Based in Santa Rosa, 25 mi away
48/100CR ScoreRanked #22 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “General contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#23 Marin H2O
Based in San Rafael, 24 mi away
48/100CR ScoreRanked #23 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 El Sobrante, 22 mi away
47/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.6★ from 30 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#25 Prushko Plumbing
Based in Sonoma, 8 mi away
47/100CR ScoreRanked #25 because of its Google rating and trade focus: 4.6★ from 15 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
All 32 septic service companies
#1 to #25 are shown in full above. Here are #26 to #32, in CR Score order; each links to its profile.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Icon Plumbing & Design | 45 | 4.0★ (4) | 25 mi |
| 27 | Prestige Plumbing and Sewer LLC | 45 | 4.4★ (14) | 23 mi |
| 28 | Mr Rooter Plumbing / Marin | 45 | 4.2★ (17) | 21 mi |
| 29 | Ernie's Plumbing and Sewer Service | 45 | 2.9★ (34) | 22 mi |
| 30 | Roy's Sewer Service | 44 | 3.6★ (15) | 24 mi |
| 31 | Arolo Company Inc. Pump & Well | 41 | 2.6★ (17) | 19 mi |
| 32 | PJC & Associates, Inc. | 41 | 3.9★ (7) | 24 mi |
Also serving Napa
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 |
|---|---|---|
| American Eagle Plumbing & Construction | 5.0★ (1) | 23 mi |
| Campi Engineering | 5.0★ (2) | 12 mi |
| Carlos' Petaluma Septic Services | 20 mi | |
| Ernie's Plumbing & Sewer Services | 22 mi | |
| GAC Plumbing Company | 5.0★ (2) | 21 mi |
| GAC Plumbing Company (Rohnert Park) | 23 mi | |
| Jaw Excavation | 5.0★ (1) | 24 mi |
| Mike Treinen-Onsite Wastewater | 19 mi | |
| Northen Sewer & Drain | 5.0★ (1) | 23 mi |
| Rapid Rooter Sewer-Drain Cleaning | 23 mi | |
| Rooterman Drain & Sewer Service | 5.0★ (2) | 14 mi |
| Roy's Sewer Services | 5.0★ (1) | 20 mi |
| Sequoia Septic Tank Service | 5.0★ (1) | 25 mi |
| Sewer Master | 12 mi | |
| Sewerinspections | 21 mi | |
| Tony B's Sewer and Drain Service | 3.0★ (2) | 17 mi |
| Trinity Oaks Septic Services | 5.0★ (1) | 9 mi |
| Vineyard Septic | 5.0★ (1) | 22 mi |
| Walker Septic Services | 11 mi | |
| West County Septic | 24 mi |
How we ranked Napa septic service companies
We scored 32 Napa 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 Napa 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 Napa: frequently asked questions
Who is the best septic service company in Napa?
By CR Score, the highest-ranked septic service company in Napa, CA is American Sanitation Inc with a CR Score of 63/100. It has 5.0★ from 361 Google reviews. Mr. Rooter Plumbing of Contra Costa County (#2) and Mr Rooter Plumbing (#3) follow. We ranked 32 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Napa?
ContractorsRanked ranks 32 septic service companies serving Napa, CA. 4 of them are based in Napa; 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 Napa are open 24/7?
11 ranked septic service companies in Napa post 24/7 hours. The highest-ranked are Mr. Rooter Plumbing of Contra Costa County (#2), Bob's underground septic (#4) and ABC Sewer & Drain (#5). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Napa work on weekends?
16 of 32 ranked septic service companies post Saturday hours and 13 post Sunday hours. The highest-ranked open Saturdays are Mr. Rooter Plumbing of Contra Costa County (#2), Bob's underground septic (#4) and ABC Sewer & Drain (#5). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Napa septic service companies have?
The median Google rating among 32 rated septic service companies in Napa is 4.8★, with a median of 18 reviews. Gray Plumbing Inc has the most, 380 reviews, and ranks #13. 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 Napa count in this ranking?
Yes, if they are within 25 mi of the Napa 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 Napa
- November 2026: CR Scores recalculated for 32 septic service companies serving Napa.
More septic service companies and Napa pages
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