Ranked #1 in Boulder
Based in Boulder
59/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.9★ from 190 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in Boulder, CO (2026)
54 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Boulder: King Rooter & Plumbing | Plumber Boulder, CO | Drain Cleaning | Sewer & Water Line | Tankless Water Heater Repair, CR Score 59/100; 4.9★ from 190 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): AAA Service Plumbing, Heating & Electric, posts 24/7 hours; ranked #2 of 54.
- 2
Most-reviewed: AAA Service Plumbing, Heating & Electric, 12,904 Google reviews at 4.8★, the most of 54 ranked; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
54 Boulder septic service companies are ranked here by CR Score, from ten published factors. 17 are open 24/7, 30 open Saturdays and 21 open Sundays, based on posted hours. The median Google rating is 4.8★ across 54 rated businesses.
Top 10 septic service companies in Boulder at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | King Rooter & Plumbing | Plumber Boulder, CO | Drain Cleaning | Sewer & Water Line | Tankless Water Heater Repair | 59 | 4.9★ (190) | Boulder | 24/7 | Overall |
| 2 | AAA Service Plumbing, Heating & Electric | 56 | 4.8★ (12,904) | Golden, 21 mi away | 24/7 | Emergencies, Most reviews |
| 3 | TYCO Plumbing | 56 | 5.0★ (766) | Boulder | Sat · Evenings | — |
| 4 | Suc N Up LLC | 55 | 4.5★ (131) | Longmont, 20 mi away | 24/7 | — |
| 5 | All Sewer and Plumbing Services LLC | 55 | 4.9★ (172) | Westminster, 16 mi away | 24/7 | — |
| 6 | Garvin's Plumbing and Sewer | 54 | 4.9★ (66) | Broomfield, 13 mi away | 24/7 | — |
| 7 | American Plumbing & Sewer | 53 | 5.0★ (241) | Fort Collins, 20 mi away | Sat · Sun | — |
| 8 | Mr. Rooter Plumbing of Denver | 53 | 4.7★ (2,079) | Denver, 23 mi away | 24/7 | — |
| 9 | Triple S Sanitary Sewer Services LLC | 52 | 4.9★ (245) | Denver, 20 mi away | 24/7 | — |
| 10 | Boonstra Excavation LLC | 52 | 5.0★ (78) | Fort Collins, 24 mi away | Sat | — |
The 54 best septic service companies in Boulder, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Golden, 21 mi away
56/100CR ScoreRanked #2 because of its Google rating and review volume: 4.8★ from 12,904 Google reviews, the most in Boulder.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Boulder
56/100CR ScoreRanked #3 because of its Google rating and review volume: 5.0★ from 766 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
#4 Suc N Up LLC
Based in Longmont, 20 mi away
55/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.5★ from 131 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Westminster, 16 mi away
55/100CR ScoreRanked #5 because of its Google rating and trade focus: 4.9★ from 172 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Broomfield, 13 mi away
54/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.9★ from 66 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Fort Collins, 20 mi away
53/100CR ScoreRanked #7 because of its Google rating and trade focus: 5.0★ from 241 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Denver, 23 mi away
53/100CR ScoreRanked #8 because of its Google rating and review volume: 4.7★ from 2,079 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Denver, 20 mi away
52/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.9★ from 245 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Fort Collins, 24 mi away
52/100CR ScoreRanked #10 because of its Google rating and trade focus: 5.0★ from 78 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Boulder
52/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.7★ from 129 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Wheat Ridge, 20 mi away
52/100CR ScoreRanked #12 because of its Google rating and review volume: 4.8★ from 363 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Denver, 22 mi away
51/100CR ScoreRanked #13 because of its Google rating and review volume: 4.8★ from 496 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Westminster, 19 mi away
51/100CR ScoreRanked #14 because of its Google rating and review volume: 4.6★ from 352 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Aurora, 25 mi away
51/100CR ScoreRanked #15 because of its Google rating and trade focus: 5.0★ from 41 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#16 Colorado Septic
Based in Denver, 13 mi away
51/100CR ScoreRanked #16 because of its Google rating and trade focus: 5.0★ from 15 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Denver, 23 mi away
50/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.8★ from 45 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Denver, 24 mi away
50/100CR ScoreRanked #18 because of its Google rating and review volume: 4.6★ from 776 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Commerce City, 25 mi away
50/100CR ScoreRanked #19 because of its Google rating and trade focus: 4.8★ from 160 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#20 Sewer Lines Only
Based in Lakewood, 22 mi away
50/100CR ScoreRanked #20 because of its Google rating and review volume: 4.9★ from 960 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Boulder
50/100CR ScoreRanked #21 because of its Google rating and trade focus: 3.8★ from 12 Google reviews, listed on Google as “Plumber”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Commerce City, 25 mi away
50/100CR ScoreRanked #22 because of its Google rating and trade focus: 5.0★ from 79 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Longmont, 8 mi away
50/100CR ScoreRanked #23 because of its Google rating and trade focus: 5.0★ from 41 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Arvada, 16 mi away
50/100CR 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 Erie, 11 mi away
50/100CR ScoreRanked #25 because of its Google rating and trade focus: 4.1★ from 17 Google reviews, listed on Google as “Septic system service”.
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 54 ranked septic service companies here; the rest are on their profiles.
Also serving Boulder
16 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) | 21 mi |
| AAR Sewer & Water - Lakewood | 24 mi | |
| AAR Sewer & Water - Thornton | 7 mi | |
| AB Septic | 5.0★ (1) | In Boulder |
| ABC Drain & Sewer Cleaning | 5.0★ (1) | 14 mi |
| American Sewer and Water | 5.0★ (1) | 20 mi |
| Coronado Excavation | 23 mi | |
| Elite Rooter Plumbers | 18 mi | |
| Haystack Custom Ag. & Septic Service | 5.0★ (2) | In Boulder |
| Integrity Water and Sewer LLC. | 19 mi | |
| KB Sewer & Drain Services LLC | 18 mi | |
| Ken Millette Plumbing, LLC | 17 mi | |
| Lewis Water & Sewer | 5.0★ (2) | 20 mi |
| McDonald Farms Enterprises Inc. | 5.0★ (1) | 22 mi |
| Poseidon Plumbing | 23 mi | |
| Sewer Inspections Colorado | 3.0★ (2) | 20 mi |
How we ranked Boulder septic service companies
We scored 54 Boulder 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 8, 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 Boulder 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 Boulder: frequently asked questions
Who is the best septic service company in Boulder?
By CR Score, the highest-ranked septic service company in Boulder, CO is King Rooter & Plumbing | Plumber Boulder, CO | Drain Cleaning | Sewer & Water Line | Tankless Water Heater Repair with a CR Score of 59/100. It has 4.9★ from 190 Google reviews. It is open 24/7. AAA Service Plumbing, Heating & Electric (#2) and TYCO Plumbing (#3) follow. We ranked 54 septic service companies on ten factors, last updated November 8, 2026.
How many septic service companies are there in Boulder?
ContractorsRanked ranks 54 septic service companies serving Boulder, CO. 4 of them are based in Boulder; the rest serve it from nearby towns. Another 16 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Boulder are open 24/7?
17 ranked septic service companies in Boulder post 24/7 hours. The highest-ranked are King Rooter & Plumbing | Plumber Boulder, CO | Drain Cleaning | Sewer & Water Line | Tankless Water Heater Repair (#1), AAA Service Plumbing, Heating & Electric (#2) and Suc N Up LLC (#4). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Boulder work on weekends?
30 of 54 ranked septic service companies post Saturday hours and 21 post Sunday hours. The highest-ranked open Saturdays are King Rooter & Plumbing | Plumber Boulder, CO | Drain Cleaning | Sewer & Water Line | Tankless Water Heater Repair (#1), AAA Service Plumbing, Heating & Electric (#2) and TYCO Plumbing (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Boulder septic service companies have?
The median Google rating among 54 rated septic service companies in Boulder is 4.8★, with a median of 38 reviews. AAA Service Plumbing, Heating & Electric has the most, 12,904 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 Boulder count in this ranking?
Yes, if they are within 25 mi of the Boulder 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 Boulder
- November 2026: CR Scores recalculated for 54 septic service companies serving Boulder.
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