58/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.7★ from 28 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Best Septic Service Companies in Discovery Bay, CA (2026)
19 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Discovery Bay: Williams Sanitary Service Inc, CR Score 58/100; 4.7★ from 28 Google reviews.
- 3
Best for emergencies (open 24/7): Roto-Rooter Plumbing & Water Cleanup, posts 24/7 hours; ranked #3 of 19.
- 3
Most-reviewed: Roto-Rooter Plumbing & Water Cleanup, 1,664 Google reviews at 4.7★, the most of 19 ranked; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
19 Discovery Bay septic service companies are ranked here by CR Score, from ten published factors. 10 are open 24/7, 14 open Saturdays and 11 open Sundays, based on posted hours. The median Google rating is 4.7★ across 19 rated businesses.
Top 10 septic service companies in Discovery Bay at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Williams Sanitary Service Inc | 58 | 4.7★ (28) | Discovery Bay | — | Overall |
| 2 | JC SEWER & DRAIN PLUMBING LIC#845004 | 56 | 4.9★ (443) | Stockton, 17 mi away | Sat · Sun | — |
| 3 | Roto-Rooter Plumbing & Water Cleanup | 55 | 4.7★ (1,664) | Manteca, 22 mi away | 24/7 | Emergencies, Most reviews |
| 4 | Parrish & Sons Inc | 54 | 4.3★ (23) | Stockton, 20 mi away | 24/7 | — |
| 5 | French Camp Septic Service | 54 | 5.0★ (7) | Stockton, 19 mi away | 24/7 | — |
| 6 | River Rats Septic Services | 54 | 4.5★ (15) | Rio Vista, 22 mi away | 24/7 | — |
| 7 | Mr. Rooter Plumbing of The Tri-Valley | 53 | 4.8★ (271) | San Ramon, 22 mi away | 24/7 | — |
| 8 | JNJ Rooter and Plumbing LLC | 52 | 5.0★ (261) | Alamo, 21 mi away | 24/7 | — |
| 9 | Precision Plumbing & Contracting | 52 | 4.8★ (396) | Brentwood, 6 mi away | — | — |
| 10 | United Site Services | 51 | 4.2★ (5) | Antioch, 11 mi away | Sat · Evenings | — |
The 19 best septic service companies in Discovery Bay, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Stockton, 17 mi away
56/100CR ScoreRanked #2 because of its Google rating and review volume: 4.9★ from 443 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Manteca, 22 mi away
55/100CR ScoreRanked #3 because of its Google rating and review volume: 4.7★ from 1,664 Google reviews, the most in Discovery Bay.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Stockton, 20 mi away
54/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.3★ 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 Stockton, 19 mi away
54/100CR ScoreRanked #5 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Rio Vista, 22 mi away
54/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.5★ from 15 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Ramon, 22 mi away
53/100CR ScoreRanked #7 because of its Google rating and review volume: 4.8★ from 271 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Alamo, 21 mi away
52/100CR ScoreRanked #8 because of its Google rating and review volume: 5.0★ from 261 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Brentwood, 6 mi away
52/100CR ScoreRanked #9 because of its Google rating and review volume: 4.8★ from 396 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Antioch, 11 mi away
51/100CR ScoreRanked #10 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 Manteca, 23 mi away
51/100CR ScoreRanked #11 because of its Google rating and review volume: 4.6★ from 253 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Stockton, 20 mi away
50/100CR ScoreRanked #12 because of its Google rating and review volume: 4.5★ from 111 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Livermore, 18 mi away
49/100CR ScoreRanked #13 because of its Google rating and availability: 4.7★ from 23 Google reviews, open 24/7.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Antioch, 14 mi away
49/100CR ScoreRanked #14 because of its Google rating and review volume: 3.9★ from 60 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Livermore, 18 mi away
49/100CR ScoreRanked #15 because of its Google rating and trade focus: 2.5★ from 8 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#16 AAA Septic Inc.
Based in Manteca, 19 mi away
49/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.7★ from 28 Google reviews, listed on Google as “Plumber”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Lodi, 21 mi away
48/100CR ScoreRanked #17 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Excavating contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Manteca, 22 mi away
47/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.6★ 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 Lodi, 23 mi away
40/100CR ScoreRanked #19 because of its Google rating and trade focus: 4.0★ from 5 Google reviews, listed on Google as “Excavating contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Also serving Discovery Bay
14 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 |
|---|---|---|
| 1st Choice Sewer & Drain | 5.0★ (1) | 23 mi |
| A-1 Rapid Rooter | 25 mi | |
| Antioch Sewer Services | 14 mi | |
| AQUA PRO PLUMBING CONTRACTOR / TRENCHLESS SEWER LINE REPAIR / SLAB LEAK LOCATORS / GAS LINE | 3.0★ (2) | 22 mi |
| Bay Area Restaurant Services LLC | 25 mi | |
| Discovery Bay Sewer Services | In Discovery Bay | |
| Evenflow sewer repair - Concord | 25 mi | |
| Fuller Septic Services | 18 mi | |
| J & G Trap Services | 5.0★ (1) | 10 mi |
| Morton Septic Backhoe & Drilling | 17 mi | |
| Mr. Rooter Plumbing of San Joaquin County | 19 mi | |
| RUFF PLUMBING | 5.0★ (2) | 18 mi |
| Short Septic & Drilling Inc | 25 mi | |
| Zuniga construction and septics llc | 15 mi |
How we ranked Discovery Bay septic service companies
We scored 19 Discovery Bay 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 2, 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 Discovery Bay 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 Discovery Bay: frequently asked questions
Who is the best septic service company in Discovery Bay?
By CR Score, the highest-ranked septic service company in Discovery Bay, CA is Williams Sanitary Service Inc with a CR Score of 58/100. It has 4.7★ from 28 Google reviews. JC SEWER & DRAIN PLUMBING LIC#845004 (#2) and Roto-Rooter Plumbing & Water Cleanup (#3) follow. We ranked 19 septic service companies on ten factors, last updated November 2, 2026.
How many septic service companies are there in Discovery Bay?
ContractorsRanked ranks 19 septic service companies serving Discovery Bay, CA. 1 of them is based in Discovery Bay; the rest serve it from nearby towns. Another 14 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Discovery Bay are open 24/7?
10 ranked septic service companies in Discovery Bay post 24/7 hours. The highest-ranked are Roto-Rooter Plumbing & Water Cleanup (#3), Parrish & Sons Inc (#4) and French Camp Septic Service (#5). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Discovery Bay work on weekends?
14 of 19 ranked septic service companies post Saturday hours and 11 post Sunday hours. The highest-ranked open Saturdays are JC SEWER & DRAIN PLUMBING LIC#845004 (#2), Roto-Rooter Plumbing & Water Cleanup (#3) and Parrish & Sons Inc (#4). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Discovery Bay septic service companies have?
The median Google rating among 19 rated septic service companies in Discovery Bay is 4.7★, with a median of 28 reviews. Roto-Rooter Plumbing & Water Cleanup has the most, 1,664 reviews, and ranks #3. 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 Discovery Bay count in this ranking?
Yes, if they are within 25 mi of the Discovery Bay 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 Discovery Bay
- November 2026: CR Scores recalculated for 19 septic service companies serving Discovery Bay.
More septic service companies and Discovery Bay pages
Septic service companies near Discovery Bay
- Septic service companies in Brentwood, CA18 ranked
- Septic service companies in Oakley, CA16 ranked
- Septic service companies in Antioch, CA16 ranked
- Septic service companies in Tracy, CA19 ranked
- Septic service companies in Stockton, CA21 ranked
- Septic service companies in Pittsburg, CA21 ranked
- Septic service companies in Livermore, CA33 ranked
- Septic service companies in Clayton, CA37 ranked
- Septic service companies in Lathrop, CA32 ranked
- Septic service companies in Garden Acres, CA23 ranked
Other trades in Discovery Bay
- Roofers in Discovery Bay544 ranked
- Plumbers in Discovery Bay324 ranked
- Electricians in Discovery Bay231 ranked
- HVAC contractors in Discovery Bay310 ranked
- General contractors in Discovery Bay343 ranked
- Painters in Discovery Bay41 ranked
- Landscapers in Discovery Bay63 ranked
- Handymen in Discovery Bay32 ranked
- Kitchen remodelers in Discovery Bay201 ranked
- Bathroom remodelers in Discovery Bay195 ranked
- Flooring contractors in Discovery Bay156 ranked
- Tile installers in Discovery Bay20 ranked
- Drywall contractors in Discovery Bay7 ranked
- Concrete contractors in Discovery Bay151 ranked
- Fence contractors in Discovery Bay88 ranked
- Deck builders in Discovery Bay66 ranked
- Siding contractors in Discovery Bay70 ranked
- Window installers in Discovery Bay250 ranked
- Gutter installers in Discovery Bay122 ranked
- Insulation contractors in Discovery Bay38 ranked
- Solar installers in Discovery Bay276 ranked
- Garage door repair companies in Discovery Bay106 ranked
- Foundation repair companies in Discovery Bay74 ranked
- Tree services in Discovery Bay134 ranked
- Masonry contractors in Discovery Bay65 ranked
- Water damage restoration companies in Discovery Bay240 ranked
- Home builders in Discovery Bay340 ranked
- Demolition contractors in Discovery Bay29 ranked
- Window cleaners in Discovery Bay20 ranked
- Pressure washing companies in Discovery Bay31 ranked
- Pest control companies in Discovery Bay146 ranked
- Paving contractors in Discovery Bay76 ranked
- Auto glass repair shops in Discovery Bay130 ranked
- Excavating contractors in Discovery Bay38 ranked
- Pool builders in Discovery Bay197 ranked
- All contractors in Discovery Bay