61/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.7★ from 127 Google reviews, listed on Google as “Septic system service”.
Best Septic Service Companies in Windsor, CA (2026)
40 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Windsor: AllStarz Pumping & Engineering, CR Score 61/100; 4.7★ from 127 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): North Bay Restroom Co., posts 24/7 hours; ranked #2 of 40.
- 4
Most-reviewed: Mr. Rooter Plumbing of Sonoma County, 923 Google reviews at 4.9★, the most of 40 ranked; ranked #4.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
40 Windsor septic service companies are ranked here by CR Score, from ten published factors. 20 are open 24/7, 32 open Saturdays and 23 open Sundays, based on posted hours. The median Google rating is 5.0★ across 40 rated businesses.
Top 10 septic service companies in Windsor at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | AllStarz Pumping & Engineering | 61 | 4.7★ (127) | Santa Rosa, 9 mi away | 24/7 | Overall |
| 2 | North Bay Restroom Co. | 61 | 5.0★ (24) | Windsor | 24/7 | Emergencies |
| 3 | Brian's Septic Service | 60 | 5.0★ (104) | Santa Rosa, 14 mi away | 24/7 | — |
| 4 | Mr. Rooter Plumbing of Sonoma County | 60 | 4.9★ (923) | Santa Rosa, 9 mi away | 24/7 | Most reviews |
| 5 | Redwood Sewer & Drain Services | 59 | 5.0★ (163) | Larkfield-Wikiup, 9 mi away | 24/7 | — |
| 6 | Northen Sewer & Drain | 58 | 5.0★ (13) | Santa Rosa, 3 mi away | 24/7 | — |
| 7 | Just-in Time Septic Pumping | 57 | 5.0★ (103) | Santa Rosa, 8 mi away | Sat · Sun · Evenings | — |
| 8 | Curoso Plumbing Inc. | 55 | 5.0★ (281) | Santa Rosa, 6 mi away | Sat · Evenings | — |
| 9 | Sonoma Landworks | 55 | 5.0★ (27) | Santa Rosa, 10 mi away | Sat | — |
| 10 | American Sewer & Drain | 55 | 5.0★ (22) | Santa Rosa, 7 mi away | 24/7 | — |
The 40 best septic service companies in Windsor, 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 Windsor
61/100CR ScoreRanked #2 because of its Google rating and trade focus: 5.0★ from 24 Google reviews, listed on Google as “Septic system service”.
Based in Santa Rosa, 14 mi away
60/100CR ScoreRanked #3 because of its Google rating and trade focus: 5.0★ from 104 Google reviews, listed on Google as “Septic system service”.
Based in Santa Rosa, 9 mi away
60/100CR ScoreRanked #4 because of its Google rating and review volume: 4.9★ from 923 Google reviews, the most in Windsor.
Based in Larkfield-Wikiup, 9 mi away
59/100CR ScoreRanked #5 because of its Google rating and review volume: 5.0★ from 163 Google reviews.
Based in Santa Rosa, 3 mi away
58/100CR ScoreRanked #6 because of its Google rating and trade focus: 5.0★ from 13 Google reviews, listed on Google as “Septic system service”.
Based in Santa Rosa, 8 mi away
57/100CR ScoreRanked #7 because of its Google rating and trade focus: 5.0★ from 103 Google reviews, listed on Google as “Plumber”.
Based in Santa Rosa, 6 mi away
55/100CR ScoreRanked #8 because of its Google rating and review volume: 5.0★ from 281 Google reviews.
Based in Santa Rosa, 10 mi away
55/100CR ScoreRanked #9 because of its Google rating and trade focus: 5.0★ from 27 Google reviews, listed on Google as “Septic system service”.
Based in Santa Rosa, 7 mi away
55/100CR ScoreRanked #10 because of its Google rating and trade focus: 5.0★ from 22 Google reviews, listed on Google as “Plumber”.
Based in Santa Rosa, 18 mi away
55/100CR ScoreRanked #11 because of its Google rating and trade focus: 5.0★ from 14 Google reviews, listed on Google as “Septic system service”.
Based in Santa Rosa, 9 mi away
55/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.2★ from 5 Google reviews, listed on Google as “Septic system service”.
Based in Sebastopol, 9 mi away
54/100CR ScoreRanked #13 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Septic system service”.
Based in Santa Rosa, 11 mi away
54/100CR ScoreRanked #14 because of its Google rating and review volume: 4.9★ from 90 Google reviews.
Based in Santa Rosa, 8 mi away
54/100CR ScoreRanked #15 because of its Google rating and trade focus: 5.0★ from 18 Google reviews, listed on Google as “Plumber”.
Based in Larkfield-Wikiup, 16 mi away
54/100CR ScoreRanked #16 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Septic system service”.
Based in Santa Rosa, 21 mi away
53/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.8★ from 21 Google reviews, listed on Google as “Septic system service”.
Based in Santa Rosa, 3 mi away
53/100CR ScoreRanked #18 because of its Google rating and trade focus: 3.5★ from 8 Google reviews, listed on Google as “Septic system service”.
Based in Healdsburg, 5 mi away
53/100CR ScoreRanked #19 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Plumber”.
Based in Santa Rosa, 7 mi away
52/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.4★ from 20 Google reviews, listed on Google as “Septic system service”.
Based in Corte Madera, 15 mi away
52/100CR ScoreRanked #21 because of its Google rating and review volume: 5.0★ from 45 Google reviews.
Based in Santa Rosa, 6 mi away
52/100CR ScoreRanked #22 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Septic system service”.
Based in Santa Rosa, 8 mi away
52/100CR ScoreRanked #23 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Septic system service”.
Based in Santa Rosa, 10 mi away
51/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.6★ from 10 Google reviews, listed on Google as “Septic system service”.
Based in Larkfield-Wikiup, 11 mi away
51/100CR ScoreRanked #25 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Plumber”.
All 40 septic service companies
#1 to #25 are shown in full above. Here are #26 to #40, in CR Score order; each links to its profile.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Septic genial | 51 | 5.0★ (4) | 11 mi |
| 27 | Apes Plumbing Heating Sewer and Drain Services | 50 | 4.9★ (90) | 25 mi |
| 28 | TODAY Septic Tank Pumping Healdsburg & Sewer Repair Service | 50 | 4.2★ (5) | 7 mi |
| 29 | Remons Main Sewer Camera Services & Drain Clearing | 50 | 5.0★ (20) | 21 mi |
| 30 | Just-in Time Plumbing and Heating | 49 | 4.8★ (23) | 11 mi |
| 31 | Advanced Septic | 49 | 3.7★ (3) | 9 mi |
| 32 | Carlos' Petaluma Septic Services | 48 | 4.4★ (7) | 21 mi |
| 33 | Environmental Pump Services | 48 | 3.5★ (11) | 24 mi |
| 34 | All Terrane Excavating Inc | 47 | 5.0★ (3) | 11 mi |
| 35 | Howie Excavating & Grading | 47 | 5.0★ (11) | 8 mi |
| 36 | Roy's Sewer Service | 45 | 3.6★ (15) | 15 mi |
| 37 | SP Plumbing | 44 | 4.3★ (6) | 9 mi |
| 38 | C&C Contracting | 43 | 5.0★ (5) | 18 mi |
| 39 | PJC & Associates, Inc. | 42 | 3.9★ (7) | 14 mi |
| 40 | Arolo Company Inc. Pump & Well | 39 | 2.6★ (17) | 24 mi |
Also serving Windsor
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 | 14 mi | |
| Drew Underground Construction Inc | 10 mi | |
| GAC Plumbing Company | 5.0★ (2) | 21 mi |
| GAC Plumbing Company (Rohnert Park) | 15 mi | |
| Jaw Excavation | 5.0★ (1) | 9 mi |
| L.J. Construction | 8 mi | |
| Mike Treinen-Onsite Wastewater | 16 mi | |
| North Bay Septic | 5.0★ (2) | 11 mi |
| Northen Sewer & Drain | 5.0★ (1) | 16 mi |
| P&M Excavating, Inc. | 14 mi | |
| Rapid Rooter Sewer-Drain Cleaning | 16 mi | |
| Roy's Sewer Services | 5.0★ (1) | 24 mi |
| Same Day Septic | 11 mi | |
| Sanitary Solutions Corp | 5.0★ (1) | 18 mi |
| Sequoia Septic Tank Service | 5.0★ (1) | 13 mi |
| Sonoma County Septic | 12 mi | |
| The Home Depot | 3.9★ (897) | In Windsor |
| Vineyard Septic | 5.0★ (1) | 16 mi |
| Walker Septic Services | 25 mi | |
| West County Septic | 15 mi |
How we ranked Windsor septic service companies
We scored 40 Windsor 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 Windsor 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 Windsor: frequently asked questions
Who is the best septic service company in Windsor?
By CR Score, the highest-ranked septic service company in Windsor, CA is AllStarz Pumping & Engineering with a CR Score of 61/100. It has 4.7★ from 127 Google reviews. It is open 24/7. North Bay Restroom Co. (#2) and Brian's Septic Service (#3) follow. We ranked 40 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Windsor?
ContractorsRanked ranks 40 septic service companies serving Windsor, CA. 1 of them is based in Windsor; 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 Windsor are open 24/7?
20 ranked septic service companies in Windsor post 24/7 hours. The highest-ranked are AllStarz Pumping & Engineering (#1), North Bay Restroom Co. (#2) and Brian's Septic Service (#3). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Windsor work on weekends?
32 of 40 ranked septic service companies post Saturday hours and 23 post Sunday hours. The highest-ranked open Saturdays are AllStarz Pumping & Engineering (#1), North Bay Restroom Co. (#2) and Brian's Septic Service (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Windsor septic service companies have?
The median Google rating among 40 rated septic service companies in Windsor is 5.0★, with a median of 14 reviews. Mr. Rooter Plumbing of Sonoma County has the most, 923 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 Windsor count in this ranking?
Yes, if they are within 25 mi of the Windsor 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 Windsor
- November 2026: CR Scores recalculated for 40 septic service companies serving Windsor.
More septic service companies and Windsor pages
Septic service companies near Windsor
- Septic service companies in Healdsburg, CA35 ranked
- Septic service companies in Santa Rosa, CA42 ranked
- Septic service companies in Rohnert Park, CA48 ranked
- Septic service companies in Petaluma, CA51 ranked
- Septic service companies in Sonoma, CA48 ranked
- Septic service companies in Novato, CA47 ranked
- Septic service companies in Napa, CA32 ranked
- Septic service companies in American Canyon, CA35 ranked
- Septic service companies in San Anselmo, CA38 ranked
- Septic service companies in San Rafael, CA38 ranked
Other trades in Windsor
- Roofers in Windsor110 ranked
- Plumbers in Windsor165 ranked
- Electricians in Windsor97 ranked
- HVAC contractors in Windsor98 ranked
- General contractors in Windsor155 ranked
- Painters in Windsor76 ranked
- Landscapers in Windsor74 ranked
- Handymen in Windsor33 ranked
- Kitchen remodelers in Windsor80 ranked
- Bathroom remodelers in Windsor69 ranked
- Flooring contractors in Windsor53 ranked
- Tile installers in Windsor19 ranked
- Drywall contractors in Windsor14 ranked
- Concrete contractors in Windsor68 ranked
- Fence contractors in Windsor47 ranked
- Deck builders in Windsor34 ranked
- Siding contractors in Windsor20 ranked
- Window installers in Windsor49 ranked
- Gutter installers in Windsor58 ranked
- Insulation contractors in Windsor15 ranked
- Solar installers in Windsor78 ranked
- Garage door repair companies in Windsor23 ranked
- Foundation repair companies in Windsor22 ranked
- Tree services in Windsor87 ranked
- Masonry contractors in Windsor46 ranked
- Water damage restoration companies in Windsor59 ranked
- Home builders in Windsor85 ranked
- Demolition contractors in Windsor16 ranked
- Window cleaners in Windsor30 ranked
- Pressure washing companies in Windsor33 ranked
- Pest control companies in Windsor50 ranked
- Paving contractors in Windsor37 ranked
- Auto glass repair shops in Windsor28 ranked
- Excavating contractors in Windsor27 ranked
- Pool builders in Windsor52 ranked
- All contractors in Windsor