67/100CR 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 St. Catharines, ON (2026)
37 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in St. Catharines: Sewer-Man Drain Service St. Catharines, CR Score 67/100; 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 37.
- 2
Most-reviewed: Sewer pro plumbing, 160 Google reviews at 5.0★, the most of 37 ranked; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
37 St. Catharines septic service companies are ranked here by CR Score, from ten published factors. 11 are open 24/7, 17 open Saturdays and 12 open Sundays, based on posted hours. The median Google rating is 4.9★ across 37 rated businesses.
Top 10 septic service companies in St. Catharines at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Sewer-Man Drain Service St. Catharines | 67 | 4.8★ (114) | St. Catharines | 24/7 | Overall |
| 2 | Sewer pro plumbing | 60 | 5.0★ (160) | Fort Erie, 34 km away | 24/7 | Emergencies, Most reviews |
| 3 | Black Water Excavating & Septic Service Inc. | 59 | 4.5★ (61) | Norfolk County, 14 km away | — | — |
| 4 | Plumber Niagara on the Lake | 59 | 5.0★ (4) | St. Catharines | 24/7 | — |
| 5 | Corny's Honey Wagon Ltd | 59 | 5.0★ (26) | St. Catharines | — | — |
| 6 | FlowRight Plumbing & Drain Services Thorold | 58 | 5.0★ (4) | Thorold, 7 km away | 24/7 | — |
| 7 | Niagara Septic Pumping | 58 | 5.0★ (20) | St. Catharines | — | — |
| 8 | Niagara Septic Pumping | 58 | 5.0★ (19) | St. Catharines | — | — |
| 9 | S C Watson Services | 58 | 3.7★ (15) | St. Catharines | — | — |
| 10 | Cosby's Septic Service Ltd | 57 | 4.5★ (25) | St. Catharines | — | — |
The 37 best septic service companies in St. Catharines, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Fort Erie, 34 km away
60/100CR ScoreRanked #2 because of its Google rating and review volume: 5.0★ from 160 Google reviews, the most in St. Catharines.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Norfolk County, 14 km away
59/100CR 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 St. Catharines
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 St. Catharines
59/100CR ScoreRanked #5 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 Thorold, 7 km away
58/100CR ScoreRanked #6 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
58/100CR ScoreRanked #7 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 St. Catharines
58/100CR ScoreRanked #8 because of its Google rating and trade focus: 5.0★ from 19 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
58/100CR ScoreRanked #9 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
57/100CR ScoreRanked #10 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.
Based in St. Catharines
57/100CR ScoreRanked #11 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
57/100CR ScoreRanked #12 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 St. Catharines
57/100CR ScoreRanked #13 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 Niagara Falls, 20 km away
56/100CR ScoreRanked #14 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, 22 km away
56/100CR ScoreRanked #15 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 Niagara Falls, 13 km away
56/100CR ScoreRanked #16 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
55/100CR ScoreRanked #17 because of its Google rating and trade focus: 5.0★ from 6 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, 30 km away
55/100CR ScoreRanked #18 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, 30 km away
55/100CR ScoreRanked #19 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
54/100CR ScoreRanked #20 because of its Google rating and review volume: 4.9★ from 30 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 St. Catharines
54/100CR ScoreRanked #22 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 Tonawanda, 36 km away
54/100CR ScoreRanked #23 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 Hamilton, 32 km away
54/100CR ScoreRanked #24 because of its Google rating and trade focus: 5.0★ from 28 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, 16 km away
54/100CR ScoreRanked #25 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.
All 37 septic service companies
#1 to #25 are shown in full above. Here are #26 to #37, in CR Score order; each links to its profile.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Volpatti Mechanical | 53 | 5.0★ (17) | 19 km |
| 27 | Elementary Property Inspections | 53 | 4.8★ (48) | 13 km |
| 28 | Port colborne Plumbing and Sewer | 53 | 5.0★ (12) | 31 km |
| 29 | Hero Plumbing Pelham | 52 | 5.0★ (6) | 14 km |
| 30 | NexFlow Plumbing Welland | 50 | 5.0★ (4) | 18 km |
| 31 | Wesko Septic Services | 50 | 5.0★ (8) | 37 km |
| 32 | Innerunion | 49 | 4.6★ (22) | 12 km |
| 33 | Coney Excavation & Construction LLC | 48 | 4.8★ (18) | 30 km |
| 34 | Back Country Group | 48 | 4.8★ (49) | 33 km |
| 35 | Louigi's Sewer & Drain Cleaning | 48 | 5.0★ (7) | 38 km |
| 36 | Palladino Excavating & Concrete | 47 | 4.7★ (27) | 33 km |
| 37 | Aquajet Sewer Service Corp | 46 | 3.7★ (3) | 35 km |
Also serving St. Catharines
19 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) | 36 km |
| First Choice Septic Services | 23 km | |
| Garofalo Sewer Cleaning | 14 km | |
| J C Plumbing & Sewer Cleaning | 32 km | |
| John Stadelmier Septic Service | In St. Catharines | |
| Johnston Pumping Service | 3.0★ (2) | In St. Catharines |
| JVS Services | 14 km | |
| Niagara Drain Master | Plumber | Plumbing | 24 hour | 6 km | |
| Niagara Falls Plumbing and Sewer | 16 km | |
| North Star Land Service | 5.0★ (1) | In St. Catharines |
| Quality Plumbing & Sewer Cleaning | 10 km | |
| Quality Plumbing Sewer Cleaning | 18 km | |
| RL Xcavators | 15 km | |
| St Catharines Plumbing Services | 5.0★ (1) | In St. Catharines |
| St. Catharines Plumbing Services | 5.0★ (27) | In St. Catharines |
| Stadelmier John Septic Service | In St. Catharines | |
| T R Symonds Signature | 33 km | |
| Ventry's Speedy Sewer Cleaning | 19 km | |
| Zwierschke Brothers Limited | 14 km |
How we ranked St. Catharines septic service companies
We scored 37 St. Catharines 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 4, 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. Catharines 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. Catharines: frequently asked questions
Who is the best septic service company in St. Catharines?
By CR Score, the highest-ranked septic service company in St. Catharines, ON is Sewer-Man Drain Service St. Catharines with a CR Score of 67/100. 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 37 septic service companies on ten factors, last updated November 4, 2026.
How many septic service companies are there in St. Catharines?
ContractorsRanked ranks 37 septic service companies serving St. Catharines, ON. 13 of them are based in St. Catharines; the rest serve it from nearby towns. Another 19 within 40 km are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in St. Catharines are open 24/7?
11 ranked septic service companies in St. Catharines post 24/7 hours. The highest-ranked are Sewer-Man Drain Service St. Catharines (#1), Sewer pro plumbing (#2) and Plumber Niagara on the Lake (#4). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in St. Catharines work on weekends?
17 of 37 ranked septic service companies post Saturday hours and 12 post Sunday hours. The highest-ranked open Saturdays are Sewer-Man Drain Service St. Catharines (#1), Sewer pro plumbing (#2) and Plumber Niagara on the Lake (#4). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do St. Catharines septic service companies have?
The median Google rating among 37 rated septic service companies in St. Catharines is 4.9★, with a median of 17 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 St. Catharines count in this ranking?
Yes, if they are within 40 km of the St. Catharines 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. Catharines
- November 2026: CR Scores recalculated for 37 septic service companies serving St. Catharines.
More septic service companies and St. Catharines pages
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