61/100CR Score
Ranked #1 because of its Google rating and review volume: 4.9★ from 1,700 Google reviews, the most in Markham.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in Markham, ON (2026)
57 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Markham: Sewer Squad Plumbing, CR Score 61/100; 4.9★ from 1,700 Google reviews; open 24/7.
- 3
Best for emergencies (open 24/7): CD Flood & Sewer Water Damage Cleanup, posts 24/7 hours; ranked #3 of 57.
- 10
Most-reviewed: Rooter-Man Drain & Sewer Repair Services Toronto, 570 Google reviews at 4.8★, the most of 57 ranked after Sewer Squad Plumbing; ranked #10.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
57 Markham septic service companies are ranked here by CR Score, from ten published factors. 35 are open 24/7, 47 open Saturdays and 41 open Sundays, based on posted hours. The median Google rating is 4.9★ across 57 rated businesses.
Top 10 septic service companies in Markham at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Sewer Squad Plumbing | 61 | 4.9★ (1,700) | Ajax, 19 km away | 24/7 | Overall |
| 2 | Brethour Brent Septic Tank Pumping Inc | 60 | 5.0★ (456) | Uxbridge, 22 km away | Sat · Evenings | — |
| 3 | CD Flood & Sewer Water Damage Cleanup | 59 | 5.0★ (388) | Toronto, 24 km away | 24/7 | Emergencies |
| 4 | Mr. Rooter Plumbing of Scarborough ON | 59 | 4.7★ (479) | Markham | 24/7 | — |
| 5 | PipeWorks Plumbing and Drain Services | 59 | 5.0★ (12) | Pickering, 7 km away | 24/7 | — |
| 6 | Crystal Drain & Plumbing, Drain Backup, Drain Cleaning, Sewer Drain Repair Scarborough | 58 | 4.9★ (85) | Scarborough, 10 km away | 24/7 | — |
| 7 | Sewer-Man Drains & Waterproofing | 58 | 4.6★ (26) | Toronto, 18 km away | 24/7 | — |
| 8 | ASAP Scarborough Plumbing Services | 57 | 5.0★ (7) | Scarborough, 12 km away | 24/7 | — |
| 9 | Superior Plumbing & Heating of Whitby | 57 | 4.8★ (33) | Oshawa, 27 km away | 24/7 | — |
| 10 | Rooter-Man Drain & Sewer Repair Services Toronto | 57 | 4.8★ (570) | Etobicoke, 33 km away | 24/7 | Most reviews |
The 57 best septic service companies in Markham, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Uxbridge, 22 km away
60/100CR ScoreRanked #2 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 Toronto, 24 km away
59/100CR ScoreRanked #3 because of its Google rating and review volume: 5.0★ from 388 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Markham
59/100CR ScoreRanked #4 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 Pickering, 7 km away
59/100CR ScoreRanked #5 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 Scarborough, 10 km away
58/100CR ScoreRanked #6 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.
Based in Toronto, 18 km away
58/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.6★ 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 Scarborough, 12 km away
57/100CR 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 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa, 27 km away
57/100CR ScoreRanked #9 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 Etobicoke, 33 km away
57/100CR ScoreRanked #10 because of its Google rating and review volume: 4.8★ from 570 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Aurora, 14 km away
56/100CR ScoreRanked #11 because of its Google rating and review volume: 4.8★ from 332 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Scarborough, 12 km away
56/100CR ScoreRanked #12 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, 11 km away
56/100CR ScoreRanked #13 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.
#14 DrainX
Based in Markham
56/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.5★ from 8 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Brampton, 11 km away
56/100CR ScoreRanked #15 because of its Google rating and trade focus: 5.0★ 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 Markham
56/100CR ScoreRanked #16 because of its Google rating and review volume: 4.5★ from 124 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Toronto, 19 km away
55/100CR ScoreRanked #17 because of its Google rating and review volume: 4.8★ from 299 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ajax, 19 km away
55/100CR ScoreRanked #18 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 Brampton, 37 km away
55/100CR ScoreRanked #19 because of its Google rating and trade focus: 4.7★ from 38 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Concord, 21 km away
55/100CR ScoreRanked #20 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 North York, 17 km away
55/100CR ScoreRanked #21 because of its Google rating and review volume: 4.9★ from 131 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Markham
55/100CR ScoreRanked #22 because of its Google rating and availability: 4.7★ from 36 Google reviews, open 24/7.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pickering, 16 km away
55/100CR ScoreRanked #23 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.
Based in Markham
55/100CR ScoreRanked #24 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.
Based in Mississauga, 37 km away
55/100CR ScoreRanked #25 because of its Google rating and trade focus: 4.9★ from 165 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Septic service companies ranked #26 to #50
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 57 ranked septic service companies here; the rest are on their profiles.
Also serving Markham
20 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 |
|---|---|---|
| AshCon Excavating Inc. | 5.0★ (1) | 25 km |
| Brock & Sons Construction Ltd | 4.9★ (7) | In Markham |
| CGT Grease Trap Cleaning Vaughan | 19 km | |
| Cleanflo Water Technologies | 5.0★ (1) | 6 km |
| DTEC Mechanical Waterproofing Expert | 5.0★ (1) | 25 km |
| Durham Septic Experts | 5.0★ (1) | 18 km |
| Everest Drain & Plumbing: Stouffville's Local Plumber | 5.0★ (1) | In Markham |
| Fockler Larry Construction | 5.0★ (2) | In Markham |
| FP Plumbing | 5.0★ (53) | In Markham |
| Indian Line Septic | 5.0★ (1) | 34 km |
| J. Hoover Limited | Full Service Construction | 5.0★ (1) | 16 km |
| MGS Mechanical Services Ltd | 2.1★ (7) | In Markham |
| Milton Septic | 5 km | |
| Muddy Men Construction | 1.5★ (2) | 27 km |
| North York sewer & drain services | 5.0★ (1) | 19 km |
| Plumbing Nerds: Plumbing & Drain Services near North York, ON | 5.0★ (2) | 18 km |
| Pro Grease Trap Cleaning Toronto | 5.0★ (1) | 26 km |
| Red Leafy Plumbing Markham | 4.9★ (69) | In Markham |
| The Super Plumber - Toronto | 17 km | |
| Velore Plumbing of Markham | 4.9★ (129) | In Markham |
How we ranked Markham septic service companies
We scored 57 Markham 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 Markham 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 Markham: frequently asked questions
Who is the best septic service company in Markham?
By CR Score, the highest-ranked septic service company in Markham, ON is Sewer Squad Plumbing with a CR Score of 61/100. It has 4.9★ from 1,700 Google reviews. It is open 24/7. Brethour Brent Septic Tank Pumping Inc (#2) and CD Flood & Sewer Water Damage Cleanup (#3) follow. We ranked 57 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Markham?
ContractorsRanked ranks 57 septic service companies serving Markham, ON. 5 of them are based in Markham; the rest serve it from nearby towns. Another 20 within 40 km are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Markham are open 24/7?
35 ranked septic service companies in Markham post 24/7 hours. The highest-ranked are Sewer Squad Plumbing (#1), CD Flood & Sewer Water Damage Cleanup (#3) and Mr. Rooter Plumbing of Scarborough ON (#4). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Markham work on weekends?
47 of 57 ranked septic service companies post Saturday hours and 41 post Sunday hours. The highest-ranked open Saturdays are Sewer Squad Plumbing (#1), Brethour Brent Septic Tank Pumping Inc (#2) and CD Flood & Sewer Water Damage Cleanup (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Markham septic service companies have?
The median Google rating among 57 rated septic service companies in Markham is 4.9★, with a median of 18 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 Markham count in this ranking?
Yes, if they are within 40 km of the Markham 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 Markham
- November 2026: CR Scores recalculated for 57 septic service companies serving Markham.
- November 2026: 1 duplicate listing merged.
More septic service companies and Markham pages
Septic service companies near Markham
- Septic service companies in Scarborough, ON53 ranked
- Septic service companies in Pickering, ON51 ranked
- Septic service companies in Richmond Hill, ON60 ranked
- Septic service companies in Willowdale, ON59 ranked
- Septic service companies in North York, ON57 ranked
- Septic service companies in Ajax, ON43 ranked
- Septic service companies in Vaughan, ON59 ranked
- Septic service companies in East York, ON51 ranked
- Septic service companies in Aurora, ON67 ranked
- Septic service companies in Toronto, ON59 ranked
Other trades in Markham
- Roofers in Markham783 ranked
- Plumbers in Markham892 ranked
- Electricians in Markham736 ranked
- HVAC contractors in Markham852 ranked
- General contractors in Markham1238 ranked
- Painters in Markham386 ranked
- Landscapers in Markham482 ranked
- Handymen in Markham196 ranked
- Kitchen remodelers in Markham864 ranked
- Bathroom remodelers in Markham747 ranked
- Flooring contractors in Markham520 ranked
- Tile installers in Markham190 ranked
- Drywall contractors in Markham56 ranked
- Concrete contractors in Markham416 ranked
- Fence contractors in Markham361 ranked
- Deck builders in Markham426 ranked
- Siding contractors in Markham210 ranked
- Window installers in Markham507 ranked
- Gutter installers in Markham286 ranked
- Insulation contractors in Markham181 ranked
- Solar installers in Markham83 ranked
- Garage door repair companies in Markham193 ranked
- Foundation repair companies in Markham370 ranked
- Tree services in Markham235 ranked
- Masonry contractors in Markham304 ranked
- Water damage restoration companies in Markham492 ranked
- Home builders in Markham880 ranked
- Demolition contractors in Markham197 ranked
- Window cleaners in Markham218 ranked
- Pressure washing companies in Markham153 ranked
- Pest control companies in Markham358 ranked
- Paving contractors in Markham325 ranked
- Auto glass repair shops in Markham322 ranked
- Excavating contractors in Markham157 ranked
- Pool builders in Markham338 ranked
- All contractors in Markham