61/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.5★ from 131 Google reviews, listed on Google as “Septic system service”.
Best Septic Service Companies in Longmont, CO (2026)
49 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Longmont: Suc N Up LLC, CR Score 61/100; 4.5★ from 131 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): King Rooter & Plumbing | Plumber Boulder, CO | Drain Cleaning | Sewer & Water Line | Tankless Water Heater Repair, posts 24/7 hours; ranked #2 of 49.
- 5
Most-reviewed: Lion Home Service, 5,912 Google reviews at 4.7★, the most of 49 ranked; ranked #5.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
49 Longmont septic service companies are ranked here by CR Score, from ten published factors. 14 are open 24/7, 26 open Saturdays and 19 open Sundays, based on posted hours. The median Google rating is 4.7★ across 49 rated businesses.
Top 10 septic service companies in Longmont at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Suc N Up LLC | 61 | 4.5★ (131) | Longmont | 24/7 | Overall |
| 2 | King Rooter & Plumbing | Plumber Boulder, CO | Drain Cleaning | Sewer & Water Line | Tankless Water Heater Repair | 56 | 4.9★ (190) | Boulder, 14 mi away | 24/7 | Emergencies |
| 3 | Boonstra Excavation LLC | 56 | 5.0★ (78) | Fort Collins, 12 mi away | Sat | — |
| 4 | Portable Restroom Solutions | 56 | 4.8★ (82) | Johnstown, 16 mi away | Sat · Sun · Evenings | — |
| 5 | Lion Home Service | 55 | 4.7★ (5,912) | Fort Collins, 25 mi away | 24/7 | Most reviews |
| 6 | American Plumbing & Sewer | 54 | 5.0★ (241) | Fort Collins, 17 mi away | Sat · Sun | — |
| 7 | All Sewer and Plumbing Services LLC | 54 | 4.9★ (172) | Westminster, 21 mi away | 24/7 | — |
| 8 | Elite Rooter Plumbers | 53 | 4.6★ (460) | Berthoud, 13 mi away | 24/7 | — |
| 9 | Garvin's Plumbing and Sewer | 53 | 4.9★ (66) | Broomfield, 18 mi away | 24/7 | — |
| 10 | Drain Solvers The Pros | 52 | 4.7★ (51) | Longmont | Sat · Sun · Evenings | — |
The 49 best septic service companies in Longmont, 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 Boulder, 14 mi away
56/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.9★ from 190 Google reviews, listed on Google as “Plumber”.
Based in Fort Collins, 12 mi away
56/100CR ScoreRanked #3 because of its Google rating and trade focus: 5.0★ from 78 Google reviews, listed on Google as “Septic system service”.
Based in Johnstown, 16 mi away
56/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.8★ from 82 Google reviews, listed on Google as “Septic system service”.
Based in Fort Collins, 25 mi away
55/100CR ScoreRanked #5 because of its Google rating and review volume: 4.7★ from 5,912 Google reviews, the most in Longmont.
Based in Fort Collins, 17 mi away
54/100CR ScoreRanked #6 because of its Google rating and trade focus: 5.0★ from 241 Google reviews, listed on Google as “Plumber”.
Based in Westminster, 21 mi away
54/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.9★ from 172 Google reviews, listed on Google as “Plumber”.
Based in Berthoud, 13 mi away
53/100CR ScoreRanked #8 because of its Google rating and review volume: 4.6★ from 460 Google reviews.
Based in Broomfield, 18 mi away
53/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.9★ from 66 Google reviews, listed on Google as “Plumber”.
Based in Longmont
52/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.7★ from 51 Google reviews, listed on Google as “Plumber”.
Based in Fort Lupton, 19 mi away
52/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.9★ from 92 Google reviews, listed on Google as “Septic system service”.
Based in Longmont
52/100CR ScoreRanked #12 because of its Google rating and trade focus: 5.0★ from 41 Google reviews, listed on Google as “Plumber”.
#13 TYCO Plumbing
Based in Boulder, 17 mi away
52/100CR ScoreRanked #13 because of its Google rating and review volume: 5.0★ from 766 Google reviews.
Based in Denver, 24 mi away
52/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.9★ from 245 Google reviews, listed on Google as “Plumber”.
Based in Firestone, 23 mi away
52/100CR ScoreRanked #15 because of its Google rating and review volume: 4.5★ from 1,331 Google reviews.
Based in Longmont
51/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.9★ from 31 Google reviews, listed on Google as “Plumber”.
Based in Loveland, 15 mi away
51/100CR ScoreRanked #17 because of its Google rating and trade focus: 1.8★ from 10 Google reviews, listed on Google as “Septic system service”.
Based in Longmont
51/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.5★ from 58 Google reviews, listed on Google as “Plumber”.
Based in Fort Collins, 14 mi away
51/100CR ScoreRanked #19 because of its Google rating and trade focus: 4.7★ from 27 Google reviews, listed on Google as “Septic system service”.
Based in Berthoud, 8 mi away
51/100CR ScoreRanked #20 because of its Google rating and availability: 5.0★ from 15 Google reviews, open 24/7.
Based in Commerce City, 24 mi away
50/100CR ScoreRanked #21 because of its Google rating and trade focus: 5.0★ from 79 Google reviews, listed on Google as “Plumber”.
Based in Aurora, 9 mi away
50/100CR ScoreRanked #22 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Septic system service”.
Based in Westminster, 24 mi away
50/100CR ScoreRanked #23 because of its Google rating and review volume: 4.6★ from 352 Google reviews.
Based in Greeley, 7 mi away
50/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.0★ from 8 Google reviews, listed on Google as “Septic system service”.
Based in Loveland, 17 mi away
50/100CR ScoreRanked #25 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Septic system service”.
All 49 septic service companies
#1 to #25 are shown in full above. Here are #26 to #49, in CR Score order; each links to its profile.
Also serving Longmont
19 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 |
|---|---|---|
| AAR Sewer & Water - Thornton | 15 mi | |
| AB Septic | 5.0★ (1) | 14 mi |
| ABC Drain & Sewer Cleaning | 5.0★ (1) | In Longmont |
| American Sewer and Water | 5.0★ (1) | 23 mi |
| Cole Excavating Inc. | 5.0★ (2) | 25 mi |
| Colorado Trenchless | Sewer Line & Septic Repair | 5.0★ (1) | 23 mi |
| Elite Rooter Plumbers | 24 mi | |
| Front Range Water Heater And Excavation of Longmont & Boulder | 5.0★ (13) | In Longmont |
| Haystack Custom Ag. & Septic Service | 5.0★ (2) | 23 mi |
| Integrity Water and Sewer LLC. | 10 mi | |
| J&J Construction Concepts | 20 mi | |
| KB Sewer & Drain Services LLC | 24 mi | |
| Ken Millette Plumbing, LLC | 3 mi | |
| Poseidon Plumbing | 20 mi | |
| Ray's Backhoe Service, LLC | 5.0★ (5) | In Longmont |
| Septic Hotline | 5.0★ (1) | 20 mi |
| Sewer Inspections Colorado | 3.0★ (2) | 23 mi |
| Sewer Lines | 22 mi | |
| Top-Notch Plumbing, Heating & Air | 25 mi |
How we ranked Longmont septic service companies
We scored 49 Longmont 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 Longmont 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 Longmont: frequently asked questions
Who is the best septic service company in Longmont?
By CR Score, the highest-ranked septic service company in Longmont, CO is Suc N Up LLC with a CR Score of 61/100. It has 4.5★ from 131 Google reviews. It is open 24/7. King Rooter & Plumbing | Plumber Boulder, CO | Drain Cleaning | Sewer & Water Line | Tankless Water Heater Repair (#2) and Boonstra Excavation LLC (#3) follow. We ranked 49 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Longmont?
ContractorsRanked ranks 49 septic service companies serving Longmont, CO. 6 of them are based in Longmont; the rest serve it from nearby towns. Another 19 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Longmont are open 24/7?
14 ranked septic service companies in Longmont post 24/7 hours. The highest-ranked are Suc N Up LLC (#1), King Rooter & Plumbing | Plumber Boulder, CO | Drain Cleaning | Sewer & Water Line | Tankless Water Heater Repair (#2) and Lion Home Service (#5). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Longmont work on weekends?
26 of 49 ranked septic service companies post Saturday hours and 19 post Sunday hours. The highest-ranked open Saturdays are Suc N Up LLC (#1), King Rooter & Plumbing | Plumber Boulder, CO | Drain Cleaning | Sewer & Water Line | Tankless Water Heater Repair (#2) and Boonstra Excavation LLC (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Longmont septic service companies have?
The median Google rating among 49 rated septic service companies in Longmont is 4.7★, with a median of 27 reviews. Lion Home Service has the most, 5,912 reviews, and ranks #5. 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 Longmont count in this ranking?
Yes, if they are within 25 mi of the Longmont 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 Longmont
- November 2026: CR Scores recalculated for 49 septic service companies serving Longmont.
More septic service companies and Longmont pages
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