66/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.8★ from 114 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 Thorold, ON (2026)
38 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Thorold: Sewer-Man Drain Service St. Catharines, CR Score 66/100; 4.8★ from 114 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Sewer pro plumbing, posts 24/7 hours; ranked #2 of 38.
- 2
Most-reviewed: Sewer pro plumbing, 160 Google reviews at 5.0★, the most of 38 ranked; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
38 Thorold septic service companies are ranked here by CR Score, from ten published factors. 12 are open 24/7, 18 open Saturdays and 13 open Sundays, based on posted hours. The median Google rating is 4.9★ across 38 rated businesses.
Top 10 septic service companies in Thorold at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Sewer-Man Drain Service St. Catharines | 66 | 4.8★ (114) | St. Catharines, 6 km away | 24/7 | Overall |
| 2 | Sewer pro plumbing | 60 | 5.0★ (160) | Fort Erie, 30 km away | 24/7 | Emergencies, Most reviews |
| 3 | Black Water Excavating & Septic Service Inc. | 60 | 4.5★ (61) | Norfolk County, 13 km away | — | — |
| 4 | FlowRight Plumbing & Drain Services Thorold | 59 | 5.0★ (4) | Thorold | 24/7 | — |
| 5 | Brown's Septic Service | 57 | 4.8★ (16) | Niagara Falls, 14 km away | — | — |
| 6 | Scott Best Sewer Services | 57 | 4.9★ (72) | Welland, 16 km away | — | — |
| 7 | Plumber Niagara on the Lake | 57 | 5.0★ (4) | St. Catharines, 14 km away | 24/7 | — |
| 8 | Corny's Honey Wagon Ltd | 57 | 5.0★ (26) | St. Catharines, 10 km away | — | — |
| 9 | Reaman Septic Svc | 57 | 4.6★ (9) | Niagara Falls, 6 km away | — | — |
| 10 | Corny's Excavating Ltd | 56 | 4.4★ (7) | St. Catharines, 7 km away | — | — |
The 38 best septic service companies in Thorold, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Fort Erie, 30 km away
60/100CR ScoreRanked #2 because of its Google rating and review volume: 5.0★ from 160 Google reviews, the most in Thorold.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Norfolk County, 13 km away
60/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.5★ from 61 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Thorold
59/100CR ScoreRanked #4 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Niagara Falls, 14 km away
57/100CR ScoreRanked #5 because of its Google rating and trade focus: 4.8★ from 16 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Welland, 16 km away
57/100CR ScoreRanked #6 because of its Google rating and review volume: 4.9★ from 72 Google reviews.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in St. Catharines, 14 km away
57/100CR ScoreRanked #7 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Catharines, 10 km away
57/100CR ScoreRanked #8 because of its Google rating and trade focus: 5.0★ from 26 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Niagara Falls, 6 km away
57/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.6★ from 9 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in St. Catharines, 7 km away
56/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.4★ 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 St. Catharines, 10 km away
56/100CR ScoreRanked #11 because of its Google rating and trade focus: 3.7★ from 15 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in St. Catharines, 6 km away
56/100CR ScoreRanked #12 because of its Google rating and review volume: 5.0★ from 19 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Catharines, 9 km away
55/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.5★ from 8 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Port Colborne, 24 km away
55/100CR ScoreRanked #14 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Port Colborne, 25 km away
55/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.6★ from 10 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Catharines, 19 km away
55/100CR ScoreRanked #16 because of its Google rating and trade focus: 5.0★ from 20 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Tonawanda, 30 km away
55/100CR ScoreRanked #17 because of its Google rating and review volume: 4.7★ from 117 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Fort Erie, 36 km away
54/100CR ScoreRanked #18 because of its Google rating and review volume: 4.8★ from 34 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Niagara Falls, 10 km away
54/100CR ScoreRanked #19 because of its Google rating and review volume: 5.0★ from 15 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Niagara Falls, 6 km away
54/100CR ScoreRanked #20 because of its Google rating and review volume: 4.8★ from 48 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Norfolk County, 37 km away
54/100CR ScoreRanked #21 because of its Google rating and trade focus: 4.9★ from 57 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Welland, 14 km away
54/100CR ScoreRanked #22 because of its Google rating and review volume: 5.0★ from 17 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Port Colborne, 26 km away
54/100CR ScoreRanked #23 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.
Based in Thorold
54/100CR ScoreRanked #24 because of its Google rating and availability: 5.0★ from 6 Google reviews, open 24/7.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Catharines, 26 km away
53/100CR ScoreRanked #25 because of its Google rating and trade focus: 4.5★ from 25 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
All 38 septic service companies
#1 to #25 are shown in full above. Here are #26 to #38, in CR Score order; each links to its profile.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Frankie's Pumping | 53 | 5.0★ (28) | 35 km |
| 27 | John Stadelmier Septic Service, Inc. | 53 | 5.0★ (4) | 8 km |
| 28 | Zwierschke Brothers Limited | 53 | 5.0★ (6) | 15 km |
| 29 | Niagara Septic Pumping | 53 | 5.0★ (19) | 34 km |
| 30 | NexFlow Plumbing Welland | 51 | 5.0★ (4) | 13 km |
| 31 | Wesko Septic Services | 50 | 5.0★ (8) | 35 km |
| 32 | Innerunion | 50 | 4.6★ (22) | 7 km |
| 33 | CDM Excavating and Contracting INC. | 50 | 4.9★ (30) | 31 km |
| 34 | Coney Excavation & Construction LLC | 49 | 4.8★ (18) | 28 km |
| 35 | Louigi's Sewer & Drain Cleaning | 48 | 5.0★ (7) | 32 km |
| 36 | Back Country Group | 48 | 4.8★ (49) | 35 km |
| 37 | Palladino Excavating & Concrete | 48 | 4.7★ (27) | 27 km |
| 38 | Aquajet Sewer Service Corp | 46 | 3.7★ (3) | 29 km |
Also serving Thorold
17 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 |
|---|---|---|
| Cecchini Plumbing | 5.0★ (1) | 30 km |
| First Choice Septic Services | 17 km | |
| Garofalo Sewer Cleaning | 8 km | |
| J C Plumbing & Sewer Cleaning | 26 km | |
| John Stadelmier Septic Service | 10 km | |
| Johnston Pumping Service | 3.0★ (2) | 6 km |
| JVS Services | 13 km | |
| Niagara Drain Master | Plumber | Plumbing | 24 hour | In Thorold | |
| Niagara Falls Plumbing and Sewer | 9 km | |
| North Star Land Service | 5.0★ (1) | 5 km |
| Quality Plumbing & Sewer Cleaning | 8 km | |
| Quality Plumbing Sewer Cleaning | 11 km | |
| RL Xcavators | 13 km | |
| Stadelmier John Septic Service | 10 km | |
| T R Symonds Signature | 26 km | |
| Ventry's Speedy Sewer Cleaning | 14 km | |
| Zwierschke Brothers Limited | 13 km |
How we ranked Thorold septic service companies
We scored 38 Thorold 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 Thorold 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 Thorold: frequently asked questions
Who is the best septic service company in Thorold?
By CR Score, the highest-ranked septic service company in Thorold, ON is Sewer-Man Drain Service St. Catharines with a CR Score of 66/100. It has 4.8★ from 114 Google reviews. It is open 24/7. Sewer pro plumbing (#2) and Black Water Excavating & Septic Service Inc. (#3) follow. We ranked 38 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Thorold?
ContractorsRanked ranks 38 septic service companies serving Thorold, ON. 2 of them are based in Thorold; the rest serve it from nearby towns. Another 17 within 40 km are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Thorold are open 24/7?
12 ranked septic service companies in Thorold post 24/7 hours. The highest-ranked are Sewer-Man Drain Service St. Catharines (#1), Sewer pro plumbing (#2) and FlowRight Plumbing & Drain Services Thorold (#4). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Thorold work on weekends?
18 of 38 ranked septic service companies post Saturday hours and 13 post Sunday hours. The highest-ranked open Saturdays are Sewer-Man Drain Service St. Catharines (#1), Sewer pro plumbing (#2) and FlowRight Plumbing & Drain Services Thorold (#4). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Thorold septic service companies have?
The median Google rating among 38 rated septic service companies in Thorold is 4.9★, with a median of 18 reviews. Sewer pro plumbing has the most, 160 reviews, and ranks #2. 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 Thorold count in this ranking?
Yes, if they are within 40 km of the Thorold 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 Thorold
- November 2026: CR Scores recalculated for 38 septic service companies serving Thorold.
More septic service companies and Thorold pages
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