64/100CR Score
Ranked #1 because of its Google rating and trade focus: 5.0★ from 112 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in O'Fallon, MO (2026)
38 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in O'Fallon: Mission Septic And Drain, CR Score 64/100; 5.0★ from 112 Google reviews; open 24/7.
- 4
Best for emergencies (open 24/7): A&M Septic and Excavating, LLC, posts 24/7 hours; ranked #4 of 38.
- 2
Most-reviewed: Superior Service, 2,219 Google reviews at 5.0★, the most of 38 ranked; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
38 O'Fallon septic service companies are ranked here by CR Score, from ten published factors. 11 are open 24/7, 25 open Saturdays and 17 open Sundays, based on posted hours. The median Google rating is 4.7★ across 38 rated businesses.
Top 10 septic service companies in O'Fallon at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Mission Septic And Drain | 64 | 5.0★ (112) | O'Fallon | 24/7 | Overall |
| 2 | Superior Service | 59 | 5.0★ (2,219) | Dardenne Prairie, 6 mi away | Sat · Sun · Evenings | Most reviews |
| 3 | Superior Service | 57 | 4.9★ (1,766) | Chesterfield, 11 mi away | Sat · Sun · Evenings | — |
| 4 | A&M Septic and Excavating, LLC | 57 | 3.1★ (18) | O'Fallon | 24/7 | Emergencies |
| 5 | Mr. Rooter Plumbing of St. Charles | 57 | 4.8★ (356) | Saint Peters, 6 mi away | 24/7 | — |
| 6 | Pierson Plumbing Sewer & Drain L.L.C | 57 | 4.8★ (169) | Saint Charles, 12 mi away | 24/7 | — |
| 7 | Hillside Septic Service | 56 | 3.7★ (10) | O'Fallon | Sat · Sun | — |
| 8 | Warrior Sewer and Drain | 56 | 4.8★ (459) | Chesterfield, 10 mi away | Sat · Evenings | — |
| 9 | Mr. Rooter Plumbing of St. Louis | 55 | 4.8★ (2,141) | Ballwin, 24 mi away | 24/7 | — |
| 10 | DC Septic & Drain | 55 | 5.0★ (5) | O'Fallon | — | — |
The 38 best septic service companies in O'Fallon, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Dardenne Prairie, 6 mi away
59/100CR ScoreRanked #2 because of its Google rating and review volume: 5.0★ from 2,219 Google reviews, the most in O'Fallon.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Chesterfield, 11 mi away
57/100CR ScoreRanked #3 because of its Google rating and review volume: 4.9★ from 1,766 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in O'Fallon
57/100CR ScoreRanked #4 because of its Google rating and trade focus: 3.1★ from 18 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Peters, 6 mi away
57/100CR ScoreRanked #5 because of its Google rating and review volume: 4.8★ from 356 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Charles, 12 mi away
57/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.8★ from 169 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in O'Fallon
56/100CR ScoreRanked #7 because of its Google rating and trade focus: 3.7★ from 10 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Chesterfield, 10 mi away
56/100CR ScoreRanked #8 because of its Google rating and review volume: 4.8★ from 459 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ballwin, 24 mi away
55/100CR ScoreRanked #9 because of its Google rating and review volume: 4.8★ from 2,141 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in O'Fallon
55/100CR ScoreRanked #10 because of its Google rating and trade focus: 5.0★ 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 Troy, 17 mi away
55/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.7★ 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 Godfrey, 13 mi away
54/100CR ScoreRanked #12 because of its Google rating and review volume: 4.9★ from 321 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
#13 The Sewer Pros
Based in Chesterfield, 10 mi away
54/100CR ScoreRanked #13 because of its Google rating and review volume: 4.9★ from 594 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pacific, 25 mi away
54/100CR ScoreRanked #14 because of its Google rating and review volume: 4.8★ from 304 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Peters, 7 mi away
53/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.8★ from 81 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Ann, 17 mi away
52/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.0★ from 177 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Louis, 19 mi away
51/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.3★ from 29 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#18 B & J Septic
Based in Troy, 19 mi away
51/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.2★ from 18 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Pacific, 23 mi away
51/100CR ScoreRanked #19 because of its Google rating and trade focus: 5.0★ from 14 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Creve Coeur, 15 mi away
51/100CR ScoreRanked #20 because of its Google rating and trade focus: 5.0★ from 40 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Bridgeton, 15 mi away
50/100CR ScoreRanked #21 because of its Google rating and trade focus: 3.7★ from 6 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Louis, 22 mi away
49/100CR ScoreRanked #22 because of its Google rating and trade focus: 4.7★ from 28 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Kirkwood, 22 mi away
49/100CR ScoreRanked #23 because of its Google rating and trade focus: 3.7★ 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 Washington, 21 mi away
49/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.5★ from 13 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Peters, 14 mi away
48/100CR ScoreRanked #25 because of its Google rating and review volume: 4.8★ from 59 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
All 38 septic service companies
#1 to #25 are shown in full above. Here are #26 to #38, in CR Score order; each links to its profile.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Eureka Plumbing Sewer and Drain | 48 | 4.9★ (79) | 22 mi |
| 27 | Mid America Drain Services | 48 | 4.4★ (36) | 22 mi |
| 28 | C E Bollmeier Co Inc | 48 | 3.9★ (7) | 13 mi |
| 29 | 1st Priority Drain Cleaning & More LLC | 48 | 4.9★ (76) | 20 mi |
| 30 | Votruba Sewer & Excavating | 47 | 4.0★ (11) | 15 mi |
| 31 | Sewer-Drain Cleaning Service | 47 | 4.7★ (6) | 24 mi |
| 32 | Alert Plumbing & Sewer Cleaning | 46 | 4.7★ (3) | 23 mi |
| 33 | A-1 Plumbing & Sewer Cleaning | 44 | 3.9★ (10) | 19 mi |
| 34 | Tharp Sewer and Drain | 44 | 4.5★ (8) | 22 mi |
| 35 | M. Turpin Services, LLC | 44 | 4.4★ (28) | 16 mi |
| 36 | All American Pumping and Drain | 44 | 3.0★ (6) | 14 mi |
| 37 | Florissant Plumbing Electrical Garage Door Repair Water Heater Repair Air Duct & Sewer Cleaning LLC | 43 | 4.1★ (7) | 25 mi |
| 38 | Flowmasters Plumbing | 43 | 4.4★ (19) | 20 mi |
Also serving O'Fallon
13 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 |
|---|---|---|
| Alpha Sewer N Drain | 24 mi | |
| Biologix Products Group | 5.0★ (1) | 19 mi |
| Burke Plumbing | 23 mi | |
| C C Drain & Sewer Cleaning Co | 25 mi | |
| Dc septic & drain | In O'Fallon | |
| Eco Septic Tank Pumping St Louis | In O'Fallon | |
| Landis Environmental Sewer Services | 5.0★ (1) | 22 mi |
| Mario's Sewer & Drain Cleaning, LLC | 19 mi | |
| Mega Rooter sewer and Drain LLC | 13 mi | |
| O'Fallon Sewer & Plumbing Repair Service | 8 mi | |
| Performance Land Management | 5.0★ (10) | In O'Fallon |
| SweenCo Sewer Rehabilitation | 5.0★ (2) | 11 mi |
| The Home Depot | 4.2★ (1,204) | In O'Fallon |
How we ranked O'Fallon septic service companies
We scored 38 O'Fallon 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 O'Fallon 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 O'Fallon: frequently asked questions
Who is the best septic service company in O'Fallon?
By CR Score, the highest-ranked septic service company in O'Fallon, MO is Mission Septic And Drain with a CR Score of 64/100. It has 5.0★ from 112 Google reviews. It is open 24/7. Superior Service (#2) and Superior Service (#3) follow. We ranked 38 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in O'Fallon?
ContractorsRanked ranks 38 septic service companies serving O'Fallon, MO. 4 of them are based in O'Fallon; the rest serve it from nearby towns. Another 13 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in O'Fallon are open 24/7?
11 ranked septic service companies in O'Fallon post 24/7 hours. The highest-ranked are Mission Septic And Drain (#1), A&M Septic and Excavating, LLC (#4) and Mr. Rooter Plumbing of St. Charles (#5). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in O'Fallon work on weekends?
25 of 38 ranked septic service companies post Saturday hours and 17 post Sunday hours. The highest-ranked open Saturdays are Mission Septic And Drain (#1), Superior Service (#2) and Superior Service (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do O'Fallon septic service companies have?
The median Google rating among 38 rated septic service companies in O'Fallon is 4.7★, with a median of 28 reviews. Superior Service has the most, 2,219 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 O'Fallon count in this ranking?
Yes, if they are within 25 mi of the O'Fallon 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 O'Fallon
- November 2026: CR Scores recalculated for 38 septic service companies serving O'Fallon.
More septic service companies and O'Fallon pages
Septic service companies near O'Fallon
- Septic service companies in Dardenne Prairie, MO40 ranked
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