59/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.9★ from 248 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 St. Thomas, ON (2026)
24 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in St. Thomas: ESI Group, CR Score 59/100; 4.9★ from 248 Google reviews.
- 2
Best for emergencies (open 24/7): DrainCam Plumbing, posts 24/7 hours; ranked #2 of 24.
- 4
Most-reviewed: Mr. Rooter Plumbing of London ON, 2,083 Google reviews at 4.8★, the most of 24 ranked; ranked #4.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
24 St. Thomas septic service companies are ranked here by CR Score, from ten published factors. 12 are open 24/7, 15 open Saturdays and 13 open Sundays, based on posted hours. The median Google rating is 4.9★ across 24 rated businesses.
Top 10 septic service companies in St. Thomas at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | ESI Group | 59 | 4.9★ (248) | St. Thomas | — | Overall |
| 2 | DrainCam Plumbing | 59 | 4.9★ (329) | London, 1 km away | 24/7 | Emergencies |
| 3 | Jumbo Plumbing | 59 | 4.9★ (318) | London, 1 km away | 24/7 | — |
| 4 | Mr. Rooter Plumbing of London ON | 59 | 4.8★ (2,083) | London, 18 km away | 24/7 | Most reviews |
| 5 | Pulse Plumbing & Drain Services St. Thomas | 58 | 5.0★ (5) | St. Thomas | 24/7 | — |
| 6 | Norm's Environmental Service | 57 | 4.9★ (68) | Ingersoll, 35 km away | 24/7 | — |
| 7 | Munroe Plumbing co. | 57 | 5.0★ (78) | St. Thomas | 24/7 | — |
| 8 | Erie Excavating & Liquid Waste | 56 | 5.0★ (7) | St. Thomas | — | — |
| 9 | AZ Environmental Services | 56 | 5.0★ (11) | Norfolk County, 23 km away | 24/7 | — |
| 10 | A B C Sanitation Inc | 55 | 4.9★ (23) | St. Thomas | — | — |
The 24 best septic service companies in St. Thomas, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in London, 1 km away
59/100CR ScoreRanked #2 because of its Google rating and review volume: 4.9★ from 329 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in London, 1 km away
59/100CR ScoreRanked #3 because of its Google rating and review volume: 4.9★ from 318 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in London, 18 km away
59/100CR ScoreRanked #4 because of its Google rating and review volume: 4.8★ from 2,083 Google reviews, the most in St. Thomas.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Thomas
58/100CR ScoreRanked #5 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 Ingersoll, 35 km away
57/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.9★ from 68 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Thomas
57/100CR ScoreRanked #7 because of its Google rating and review volume: 5.0★ from 78 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Thomas
56/100CR ScoreRanked #8 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Norfolk County, 23 km away
56/100CR ScoreRanked #9 because of its Google rating and trade focus: 5.0★ from 11 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Thomas
55/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.9★ 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 London, 18 km away
53/100CR ScoreRanked #11 because of its Google rating and review volume: 4.8★ from 85 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Norfolk County, 11 km away
53/100CR ScoreRanked #12 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
#13 Choice
Based in London, 17 km away
53/100CR ScoreRanked #13 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.
#14 Lake Services
Based in St. Thomas
52/100CR ScoreRanked #14 because of its Google rating and trade focus: 3.4★ 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 London, 24 km away
52/100CR ScoreRanked #15 because of its Google rating and review volume: 4.6★ from 132 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
#16 M Jones Limited
Based in London, 39 km away
52/100CR ScoreRanked #16 because of its Google rating and trade focus: 5.0★ from 12 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Dorchester, 25 km away
52/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.6★ from 47 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#18 Jumbo Plumbing
Based in London, 25 km away
51/100CR ScoreRanked #18 because of its Google rating and availability: 5.0★ from 35 Google reviews, open 24/7.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ingersoll, 39 km away
51/100CR ScoreRanked #19 because of its Google rating and trade focus: 5.0★ from 18 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in London, 23 km away
49/100CR ScoreRanked #20 because of its Google rating and availability: 4.6★ from 11 Google reviews, open 24/7.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ingersoll, 39 km away
49/100CR ScoreRanked #21 because of its Google rating and trade focus: 4.9★ 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 Norfolk County, 10 km away
48/100CR ScoreRanked #22 because of its Google rating and trade focus: 5.0★ from 11 Google reviews, listed on Google as “Excavating contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Norfolk County, 38 km away
48/100CR ScoreRanked #23 because of its Google rating and availability: 4.7★ from 21 Google reviews, open 24/7.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Norfolk County, 36 km away
44/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.6★ from 33 Google reviews, listed on Google as “Excavating contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Also serving St. Thomas
8 more septic service companies within 40 km that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| Abc Sanitation | 5.0★ (1) | 11 km |
| Delta Plumbers of St Thomas | 5.0★ (109) | In St. Thomas |
| MacCallum Pumping Solutions | In St. Thomas | |
| Plumber Ingersoll | 37 km | |
| Sanitary Sewer Cleaning | 5.0★ (2) | 18 km |
| Streib Trucking & Excavating Ltd | 4.7★ (16) | In St. Thomas |
| Therrien Excavating | 5.0★ (1) | 34 km |
| Wall-Ex Inc | 4.0★ (2) | 26 km |
How we ranked St. Thomas septic service companies
We scored 24 St. Thomas 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 St. Thomas 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 St. Thomas: frequently asked questions
Who is the best septic service company in St. Thomas?
By CR Score, the highest-ranked septic service company in St. Thomas, ON is ESI Group with a CR Score of 59/100. It has 4.9★ from 248 Google reviews. DrainCam Plumbing (#2) and Jumbo Plumbing (#3) follow. We ranked 24 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in St. Thomas?
ContractorsRanked ranks 24 septic service companies serving St. Thomas, ON. 6 of them are based in St. Thomas; the rest serve it from nearby towns. Another 8 within 40 km are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in St. Thomas are open 24/7?
12 ranked septic service companies in St. Thomas post 24/7 hours. The highest-ranked are DrainCam Plumbing (#2), Jumbo Plumbing (#3) and Mr. Rooter Plumbing of London ON (#4). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in St. Thomas work on weekends?
15 of 24 ranked septic service companies post Saturday hours and 13 post Sunday hours. The highest-ranked open Saturdays are DrainCam Plumbing (#2), Jumbo Plumbing (#3) and Mr. Rooter Plumbing of London ON (#4). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do St. Thomas septic service companies have?
The median Google rating among 24 rated septic service companies in St. Thomas is 4.9★, with a median of 22 reviews. Mr. Rooter Plumbing of London ON has the most, 2,083 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 St. Thomas count in this ranking?
Yes, if they are within 40 km of the St. Thomas city centre, 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 St. Thomas
- November 2026: CR Scores recalculated for 24 septic service companies serving St. Thomas.
More septic service companies and St. Thomas pages
Septic service companies near St. Thomas
- Septic service companies in London, ON25 ranked
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- Septic service companies in Woodstock, ON31 ranked
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- Septic service companies in Simcoe, ON25 ranked
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Other trades in St. Thomas
- Roofers in St. Thomas114 ranked
- Plumbers in St. Thomas118 ranked
- Electricians in St. Thomas86 ranked
- HVAC contractors in St. Thomas129 ranked
- General contractors in St. Thomas133 ranked
- Painters in St. Thomas52 ranked
- Landscapers in St. Thomas67 ranked
- Handymen in St. Thomas23 ranked
- Kitchen remodelers in St. Thomas79 ranked
- Bathroom remodelers in St. Thomas83 ranked
- Flooring contractors in St. Thomas71 ranked
- Tile installers in St. Thomas19 ranked
- Drywall contractors in St. Thomas9 ranked
- Concrete contractors in St. Thomas91 ranked
- Fence contractors in St. Thomas79 ranked
- Deck builders in St. Thomas85 ranked
- Siding contractors in St. Thomas46 ranked
- Window installers in St. Thomas68 ranked
- Gutter installers in St. Thomas48 ranked
- Insulation contractors in St. Thomas22 ranked
- Solar installers in St. Thomas11 ranked
- Garage door repair companies in St. Thomas27 ranked
- Foundation repair companies in St. Thomas33 ranked
- Tree services in St. Thomas24 ranked
- Masonry contractors in St. Thomas37 ranked
- Water damage restoration companies in St. Thomas69 ranked
- Home builders in St. Thomas101 ranked
- Demolition contractors in St. Thomas17 ranked
- Window cleaners in St. Thomas11 ranked
- Pressure washing companies in St. Thomas14 ranked
- Pest control companies in St. Thomas48 ranked
- Paving contractors in St. Thomas38 ranked
- Auto glass repair shops in St. Thomas40 ranked
- Excavating contractors in St. Thomas42 ranked
- Pool builders in St. Thomas50 ranked
- All contractors in St. Thomas