58/100CR Score
Ranked #1 because of its Google rating and review volume: 4.8★ from 12,904 Google reviews, the most in Thornton.
Best Septic Service Companies in Thornton, CO (2026)
80 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Thornton: AAA Service Plumbing, Heating & Electric, CR Score 58/100; 4.8★ from 12,904 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): All Sewer and Plumbing Services LLC, posts 24/7 hours; ranked #2 of 80.
- 9
Most-reviewed: Mr. Rooter Plumbing of Denver, 2,079 Google reviews at 4.7★, the most of 80 ranked after AAA Service Plumbing, Heating & Electric; ranked #9.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
80 Thornton septic service companies are ranked here by CR Score, from ten published factors. 28 are open 24/7, 52 open Saturdays and 37 open Sundays, based on posted hours. The median Google rating is 4.8★ across 80 rated businesses.
Top 10 septic service companies in Thornton at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | AAA Service Plumbing, Heating & Electric | 58 | 4.8★ (12,904) | Golden, 14 mi away | 24/7 | Overall |
| 2 | All Sewer and Plumbing Services LLC | 58 | 4.9★ (172) | Westminster, 4 mi away | 24/7 | Emergencies |
| 3 | AAR Sewer & Water - Arvada | 57 | 5.0★ (3) | Thornton | 24/7 | — |
| 4 | Triple S Sanitary Sewer Services LLC | 57 | 4.9★ (245) | Denver, 3 mi away | 24/7 | — |
| 5 | Colorado Pumping | 57 | 5.0★ (111) | Aurora, 9 mi away | 24/7 | — |
| 6 | Affordable Sewer and Plumbing Services | 57 | 5.0★ (26) | Thornton | Sat · Evenings | — |
| 7 | Garvin's Plumbing and Sewer | 57 | 4.8★ (815) | Englewood, 14 mi away | 24/7 | — |
| 8 | King Rooter & Plumbing | Plumbers Denver, CO | Drain Cleaning | Sewer & Water Line | Tankless Water Heater Repair | 56 | 4.7★ (479) | Denver, 10 mi away | 24/7 | — |
| 9 | Mr. Rooter Plumbing of Denver | 56 | 4.7★ (2,079) | Denver, 9 mi away | 24/7 | Most reviews |
| 10 | American Plumbing & Sewer | 56 | 5.0★ (241) | Fort Collins, 8 mi away | Sat · Sun | — |
The 80 best septic service companies in Thornton, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Based in Westminster, 4 mi away
58/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.9★ from 172 Google reviews, listed on Google as “Plumber”.
Based in Thornton
57/100CR ScoreRanked #3 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Septic system service”.
Based in Denver, 3 mi away
57/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.9★ from 245 Google reviews, listed on Google as “Plumber”.
Based in Aurora, 9 mi away
57/100CR ScoreRanked #5 because of its Google rating and trade focus: 5.0★ from 111 Google reviews, listed on Google as “Septic system service”.
Based in Thornton
57/100CR ScoreRanked #6 because of its Google rating and trade focus: 5.0★ from 26 Google reviews, listed on Google as “Septic system service”.
Based in Englewood, 14 mi away
57/100CR ScoreRanked #7 because of its Google rating and review volume: 4.8★ from 815 Google reviews.
Based in Denver, 10 mi away
56/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.7★ from 479 Google reviews, listed on Google as “Plumber”.
Based in Denver, 9 mi away
56/100CR ScoreRanked #9 because of its Google rating and review volume: 4.7★ from 2,079 Google reviews.
Based in Fort Collins, 8 mi away
56/100CR ScoreRanked #10 because of its Google rating and trade focus: 5.0★ from 241 Google reviews, listed on Google as “Plumber”.
Based in Broomfield, 6 mi away
56/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.9★ from 66 Google reviews, listed on Google as “Plumber”.
Based in Aurora, 6 mi away
55/100CR ScoreRanked #12 because of its Google rating and trade focus: 5.0★ from 41 Google reviews, listed on Google as “Plumber”.
Based in Denver, 8 mi away
55/100CR ScoreRanked #13 because of its Google rating and review volume: 4.8★ from 496 Google reviews.
Based in Commerce City, 7 mi away
55/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.8★ from 160 Google reviews, listed on Google as “Plumber”.
Based in Wheat Ridge, 9 mi away
54/100CR ScoreRanked #15 because of its Google rating and review volume: 4.8★ from 363 Google reviews.
Based in Westminster, 4 mi away
54/100CR ScoreRanked #16 because of its Google rating and review volume: 4.6★ from 352 Google reviews.
Based in Commerce City, 7 mi away
54/100CR ScoreRanked #17 because of its Google rating and trade focus: 5.0★ from 79 Google reviews, listed on Google as “Plumber”.
Based in Denver, 8 mi away
54/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.8★ from 45 Google reviews, listed on Google as “Plumber”.
#19 Suc N Up LLC
Based in Longmont, 24 mi away
54/100CR ScoreRanked #19 because of its Google rating and trade focus: 4.5★ from 131 Google reviews, listed on Google as “Septic system service”.
Based in Denver, 9 mi away
54/100CR ScoreRanked #20 because of its Google rating and trade focus: 5.0★ from 33 Google reviews, listed on Google as “Plumber”.
#21 TYCO Plumbing
Based in Boulder, 6 mi away
54/100CR ScoreRanked #21 because of its Google rating and review volume: 5.0★ from 766 Google reviews.
Based in Denver, 14 mi away
54/100CR ScoreRanked #22 because of its Google rating and trade focus: 4.8★ from 22 Google reviews, listed on Google as “Septic system service”.
Based in Boulder, 19 mi away
54/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.9★ from 190 Google reviews, listed on Google as “Plumber”.
Based in Golden, 8 mi away
54/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.8★ from 359 Google reviews, listed on Google as “Plumber”.
Based in Denver, 10 mi away
54/100CR ScoreRanked #25 because of its Google rating and review volume: 4.6★ from 776 Google reviews.
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 80 ranked septic service companies here; the rest are on their profiles.
Also serving Thornton
20 more septic service companies within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| A-Acme Sanitary & Sewer Services | 5.0★ (2) | 5 mi |
| AB Septic | 5.0★ (1) | 19 mi |
| ABC Drain & Sewer Cleaning | 5.0★ (1) | 22 mi |
| American Sewer and Water | 5.0★ (1) | 1 mi |
| Colorado Underground Detection LLC | 4.9★ (22) | In Thornton |
| Coronado Excavation | 5 mi | |
| Elite Rooter Plumbers | 4 mi | |
| Ferguson | 4.4★ (14) | In Thornton |
| KB Sewer & Drain Services LLC | 4 mi | |
| Lewis Water & Sewer | 5.0★ (2) | 15 mi |
| McDonald Farms Enterprises Inc. | 5.0★ (1) | 5 mi |
| Mr. Preventative Sewer & Drain | 10 mi | |
| My Plumbing and Sewer Aurora Pro | 5.0★ (2) | 15 mi |
| Poseidon Plumbing | 10 mi | |
| Ruby Septic, LLC | In Thornton | |
| Sewer Inspections Colorado | 3.0★ (2) | In Thornton |
| Sewer Lines | 14 mi | |
| Sewer Lines Parker | 13 mi | |
| TBC Septic | 5.0★ (1) | 22 mi |
| Vaughn Concrete Products, Inc. | 3.9★ (21) | In Thornton |
How we ranked Thornton septic service companies
We scored 80 Thornton 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 2, 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 Thornton 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 Thornton: frequently asked questions
Who is the best septic service company in Thornton?
By CR Score, the highest-ranked septic service company in Thornton, CO is AAA Service Plumbing, Heating & Electric with a CR Score of 58/100. It has 4.8★ from 12,904 Google reviews. It is open 24/7. All Sewer and Plumbing Services LLC (#2) and AAR Sewer & Water - Arvada (#3) follow. We ranked 80 septic service companies on ten factors, last updated November 2, 2026.
How many septic service companies are there in Thornton?
ContractorsRanked ranks 80 septic service companies serving Thornton, CO. 2 of them are based in Thornton; the rest serve it from nearby towns. Another 20 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Thornton are open 24/7?
28 ranked septic service companies in Thornton post 24/7 hours. The highest-ranked are AAA Service Plumbing, Heating & Electric (#1), All Sewer and Plumbing Services LLC (#2) and AAR Sewer & Water - Arvada (#3). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Thornton work on weekends?
52 of 80 ranked septic service companies post Saturday hours and 37 post Sunday hours. The highest-ranked open Saturdays are AAA Service Plumbing, Heating & Electric (#1), All Sewer and Plumbing Services LLC (#2) and AAR Sewer & Water - Arvada (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Thornton septic service companies have?
The median Google rating among 80 rated septic service companies in Thornton is 4.8★, with a median of 33 reviews. AAA Service Plumbing, Heating & Electric has the most, 12,904 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 Thornton count in this ranking?
Yes, if they are within 25 mi of the Thornton city center, 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 Thornton
- November 2026: CR Scores recalculated for 80 septic service companies serving Thornton.
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