62/100CR Score
Ranked #1 because of its Google rating and review volume: 4.9★ from 1,700 Google reviews, the most in Oshawa.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in Oshawa, ON (2026)
30 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Oshawa: Sewer Squad Plumbing, CR Score 62/100; 4.9★ from 1,700 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Superior Plumbing & Heating of Whitby, posts 24/7 hours; ranked #2 of 30.
- 15
Most-reviewed: Mr. Rooter Plumbing of Scarborough ON, 479 Google reviews at 4.7★, the most of 30 ranked after Sewer Squad Plumbing; ranked #15.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
30 Oshawa septic service companies are ranked here by CR Score, from ten published factors. 16 are open 24/7, 21 open Saturdays and 18 open Sundays, based on posted hours. The median Google rating is 4.9★ across 30 rated businesses.
Top 10 septic service companies in Oshawa at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Sewer Squad Plumbing | 62 | 4.9★ (1,700) | Ajax, 17 km away | 24/7 | Overall |
| 2 | Superior Plumbing & Heating of Whitby | 61 | 4.8★ (33) | Oshawa | 24/7 | Emergencies |
| 3 | Brethour Brent Septic Tank Pumping Inc | 59 | 5.0★ (456) | Uxbridge, 29 km away | Sat · Evenings | — |
| 4 | AQUAMATIC Septic System Repair Specialists | 56 | 4.9★ (110) | East Gwillimbury, 35 km away | Sat · Sun | — |
| 5 | Mr. Rooter Plumbing of Whitby-Oshawa | 56 | 4.7★ (333) | Ajax, 11 km away | 24/7 | — |
| 6 | Clarington Septic Repairs | 56 | 5.0★ (64) | Toronto, 14 km away | Evenings | — |
| 7 | Oshawa Plumbing and Sewer | 56 | 5.0★ (10) | Oshawa | 24/7 | — |
| 8 | Mr Rooter Plumbing of Ajax-Pickering | 55 | 4.7★ (393) | Ajax, 23 km away | 24/7 | — |
| 9 | PipeWorks Plumbing and Drain Services | 54 | 5.0★ (12) | Pickering, 35 km away | 24/7 | — |
| 10 | ONT Restoration FLOOD-FIRE-SEWER BACKUP-MOULD-ASBESTOS | 54 | 5.0★ (24) | Pickering, 19 km away | 24/7 | — |
The 30 best septic service companies in Oshawa, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Oshawa
61/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.8★ from 33 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Uxbridge, 29 km away
59/100CR ScoreRanked #3 because of its Google rating and trade focus: 5.0★ from 456 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in East Gwillimbury, 35 km away
56/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.9★ from 110 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ajax, 11 km away
56/100CR ScoreRanked #5 because of its Google rating and review volume: 4.7★ from 333 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Toronto, 14 km away
56/100CR ScoreRanked #6 because of its Google rating and trade focus: 5.0★ from 64 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
56/100CR ScoreRanked #7 because of its Google rating and trade focus: 5.0★ from 10 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ajax, 23 km away
55/100CR ScoreRanked #8 because of its Google rating and review volume: 4.7★ from 393 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pickering, 35 km away
54/100CR ScoreRanked #9 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 Pickering, 19 km away
54/100CR ScoreRanked #10 because of its Google rating and trade focus: 5.0★ from 24 Google reviews, listed on Google as “Water damage restoration service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#11 Coulter Waste
Based in Oshawa
54/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.2★ from 24 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
54/100CR ScoreRanked #12 because of its Google rating and review volume: 4.3★ from 64 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Scarborough, 37 km away
53/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.9★ from 85 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#14 Sash Contracting
Based in Uxbridge, 21 km away
53/100CR ScoreRanked #14 because of its Google rating and trade focus: 5.0★ from 12 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Markham, 34 km away
53/100CR ScoreRanked #15 because of its Google rating and review volume: 4.7★ from 479 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Scarborough, 32 km away
53/100CR ScoreRanked #16 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 Scarborough, 39 km away
53/100CR ScoreRanked #17 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 Scarborough, 34 km away
52/100CR ScoreRanked #18 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa
52/100CR ScoreRanked #19 because of its Google rating and trade focus: 5.0★ from 15 Google reviews, listed on Google as “Excavating contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Scarborough, 17 km away
52/100CR ScoreRanked #20 because of its Google rating and trade focus: 3.6★ 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 Ajax, 16 km away
51/100CR ScoreRanked #21 because of its Google rating and trade focus: 2.4★ from 5 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Toronto, 27 km away
51/100CR ScoreRanked #22 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 Oshawa
51/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.7★ from 24 Google reviews, listed on Google as “Excavating contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#24 Courtice Septic
Based in Port Hope, 34 km away
51/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.9★ from 29 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Port Hope, 39 km away
51/100CR ScoreRanked #25 because of its Google rating and trade focus: 2.3★ from 3 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
All 30 septic service companies
#1 to #25 are shown in full above. Here are #26 to #30, in CR Score order; each links to its profile.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Advanced Septic Solutions Inc | 50 | 4.7★ (22) | 30 km |
| 27 | Mr. Rooter Plumbing of Markham | 50 | 4.5★ (124) | 37 km |
| 28 | Deson Construction Limited | 50 | 5.0★ (6) | 27 km |
| 29 | Larkin Construction | 50 | 5.0★ (3) | 31 km |
| 30 | Mr. Rooter Plumbing of Uxbridge ON | 47 | 4.0★ (7) | 31 km |
Also serving Oshawa
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 |
|---|---|---|
| Cleanflo Water Technologies | 5.0★ (1) | 37 km |
| Durham Septic Experts | 5.0★ (1) | 33 km |
| Durham Septic Pumping | In Oshawa | |
| Everest Drain & Plumbing: Stouffville's Local Plumber | 5.0★ (1) | 40 km |
| J. Hoover Limited | Full Service Construction | 5.0★ (1) | 31 km |
| Milton Septic | 36 km | |
| Muddy Men Construction | 1.5★ (2) | 40 km |
| Oshawa Septic Tank Cleaning | In Oshawa |
How we ranked Oshawa septic service companies
We scored 30 Oshawa 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 Oshawa 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 Oshawa: frequently asked questions
Who is the best septic service company in Oshawa?
By CR Score, the highest-ranked septic service company in Oshawa, ON is Sewer Squad Plumbing with a CR Score of 62/100. It has 4.9★ from 1,700 Google reviews. It is open 24/7. Superior Plumbing & Heating of Whitby (#2) and Brethour Brent Septic Tank Pumping Inc (#3) follow. We ranked 30 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Oshawa?
ContractorsRanked ranks 30 septic service companies serving Oshawa, ON. 6 of them are based in Oshawa; 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 Oshawa are open 24/7?
16 ranked septic service companies in Oshawa post 24/7 hours. The highest-ranked are Sewer Squad Plumbing (#1), Superior Plumbing & Heating of Whitby (#2) and Mr. Rooter Plumbing of Whitby-Oshawa (#5). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Oshawa work on weekends?
21 of 30 ranked septic service companies post Saturday hours and 18 post Sunday hours. The highest-ranked open Saturdays are Sewer Squad Plumbing (#1), Superior Plumbing & Heating of Whitby (#2) and Brethour Brent Septic Tank Pumping Inc (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Oshawa septic service companies have?
The median Google rating among 30 rated septic service companies in Oshawa is 4.9★, with a median of 23 reviews. Sewer Squad Plumbing has the most, 1,700 reviews, and ranks #1. 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 Oshawa count in this ranking?
Yes, if they are within 40 km of the Oshawa 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 Oshawa
- November 2026: CR Scores recalculated for 30 septic service companies serving Oshawa.
More septic service companies and Oshawa pages
Septic service companies near Oshawa
- Septic service companies in Ajax, ON43 ranked
- Septic service companies in Pickering, ON51 ranked
- Septic service companies in Uxbridge, ON49 ranked
- Septic service companies in Markham, ON57 ranked
- Septic service companies in Scarborough, ON53 ranked
- Septic service companies in Port Hope, ON15 ranked
- Septic service companies in East York, ON51 ranked
- Septic service companies in Willowdale, ON59 ranked
- Septic service companies in Richmond Hill, ON60 ranked
- Septic service companies in North York, ON57 ranked
Other trades in Oshawa
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- All contractors in Oshawa