60/100CR Score
Ranked #1 because of its Google rating and review volume: 5.0★ from 2,219 Google reviews, the most in Lake Saint Louis.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in Lake Saint Louis, MO (2026)
31 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Lake Saint Louis: Superior Service, CR Score 60/100; 5.0★ from 2,219 Google reviews; open 7 days a week.
- 2
Best for emergencies (open 24/7): Mission Septic And Drain, posts 24/7 hours; ranked #2 of 31.
- 3
Most-reviewed: Superior Service, 1,766 Google reviews at 4.9★, the most of 31 ranked after Superior Service; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
31 Lake Saint Louis septic service companies are ranked here by CR Score, from ten published factors. 11 are open 24/7, 22 open Saturdays and 14 open Sundays, based on posted hours. The median Google rating is 4.8★ across 31 rated businesses.
Top 10 septic service companies in Lake Saint Louis at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Superior Service | 60 | 5.0★ (2,219) | Dardenne Prairie, 2 mi away | Sat · Sun · Evenings | Overall |
| 2 | Mission Septic And Drain | 59 | 5.0★ (112) | O'Fallon, 19 mi away | 24/7 | Emergencies |
| 3 | Superior Service | 57 | 4.9★ (1,766) | Chesterfield, 13 mi away | Sat · Sun · Evenings | Most reviews |
| 4 | A&M Septic and Excavating, LLC | 57 | 3.1★ (18) | O'Fallon, 2 mi away | 24/7 | — |
| 5 | Dc septic & drain | 56 | 4.7★ (15) | Troy, 14 mi away | 24/7 | — |
| 6 | Mr. Rooter Plumbing of St. Charles | 56 | 4.8★ (356) | Saint Peters, 10 mi away | 24/7 | — |
| 7 | Pierson Plumbing Sewer & Drain L.L.C | 56 | 4.8★ (169) | Saint Charles, 16 mi away | 24/7 | — |
| 8 | Warrior Sewer and Drain | 55 | 4.8★ (459) | Chesterfield, 12 mi away | Sat · Evenings | — |
| 9 | Shamrock Sewer & Drain | 55 | 4.8★ (304) | Pacific, 24 mi away | 24/7 | — |
| 10 | The Sewer Pros | 54 | 4.9★ (594) | Chesterfield, 12 mi away | — | — |
The 31 best septic service companies in Lake Saint Louis, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in O'Fallon, 19 mi away
59/100CR ScoreRanked #2 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.
Based in Chesterfield, 13 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, 2 mi away
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 Troy, 14 mi away
56/100CR ScoreRanked #5 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 Saint Peters, 10 mi away
56/100CR ScoreRanked #6 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, 16 mi away
56/100CR ScoreRanked #7 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 Chesterfield, 12 mi away
55/100CR 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 Pacific, 24 mi away
55/100CR ScoreRanked #9 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.
#10 The Sewer Pros
Based in Chesterfield, 12 mi away
54/100CR ScoreRanked #10 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 Godfrey, 16 mi away
54/100CR ScoreRanked #11 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.
Based in O'Fallon, 12 mi away
53/100CR ScoreRanked #12 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 Saint Peters, 10 mi away
53/100CR ScoreRanked #13 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.
#14 B & J Septic
Based in Troy, 16 mi away
52/100CR ScoreRanked #14 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, 22 mi away
52/100CR ScoreRanked #15 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 Saint Ann, 21 mi away
51/100CR 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 Union, 24 mi away
50/100CR ScoreRanked #17 because of its Google rating and review volume: 4.8★ from 104 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Louis, 23 mi away
50/100CR ScoreRanked #18 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.
Based in Creve Coeur, 18 mi away
50/100CR ScoreRanked #19 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, 20 mi away
50/100CR ScoreRanked #20 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 Washington, 19 mi away
50/100CR ScoreRanked #21 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, 13 mi away
49/100CR ScoreRanked #22 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.
Based in Eureka, 23 mi away
48/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.9★ from 79 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Valley Park, 24 mi away
48/100CR ScoreRanked #24 because of its Google rating and availability: 4.4★ from 36 Google reviews, open 24/7.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Bridgeton, 17 mi away
47/100CR ScoreRanked #25 because of its Google rating and availability: 3.9★ from 7 Google reviews, open 24/7.
Based on 8 of 10 factors; credentials and recency not yet collected.
All 31 septic service companies
#1 to #25 are shown in full above. Here are #26 to #31, in CR Score order; each links to its profile.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | 1st Priority Drain Cleaning & More LLC | 47 | 4.9★ (76) | 24 mi |
| 27 | Votruba Sewer & Excavating | 47 | 4.0★ (11) | 19 mi |
| 28 | M. Turpin Services, LLC | 45 | 4.4★ (28) | 12 mi |
| 29 | All American Pumping and Drain | 45 | 3.0★ (6) | 10 mi |
| 30 | A-1 Plumbing & Sewer Cleaning | 44 | 3.9★ (10) | 23 mi |
| 31 | Flowmasters Plumbing | 42 | 4.4★ (19) | 24 mi |
Also serving Lake Saint Louis
10 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 | 20 mi | |
| Biologix Products Group | 5.0★ (1) | 23 mi |
| Burke Plumbing | In Lake Saint Louis | |
| Dc septic & drain | 13 mi | |
| Eco Septic Tank Pumping St Louis | 20 mi | |
| Mario's Sewer & Drain Cleaning, LLC | 22 mi | |
| Mega Rooter sewer and Drain LLC | 16 mi | |
| O'Fallon Sewer & Plumbing Repair Service | 4 mi | |
| Pro Outdoor | 4.7★ (755) | In Lake Saint Louis |
| SweenCo Sewer Rehabilitation | 5.0★ (2) | 15 mi |
How we ranked Lake Saint Louis septic service companies
We scored 31 Lake Saint Louis 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 Lake Saint Louis 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 Lake Saint Louis: frequently asked questions
Who is the best septic service company in Lake Saint Louis?
By CR Score, the highest-ranked septic service company in Lake Saint Louis, MO is Superior Service with a CR Score of 60/100. It has 5.0★ from 2,219 Google reviews. It is open 7 days a week. Mission Septic And Drain (#2) and Superior Service (#3) follow. We ranked 31 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Lake Saint Louis?
ContractorsRanked ranks 31 septic service companies serving Lake Saint Louis, MO. Another 10 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Lake Saint Louis are open 24/7?
11 ranked septic service companies in Lake Saint Louis post 24/7 hours. The highest-ranked are Mission Septic And Drain (#2), A&M Septic and Excavating, LLC (#4) and Dc septic & drain (#5). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Lake Saint Louis work on weekends?
22 of 31 ranked septic service companies post Saturday hours and 14 post Sunday hours. The highest-ranked open Saturdays are Superior Service (#1), Mission Septic And Drain (#2) and Superior Service (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Lake Saint Louis septic service companies have?
The median Google rating among 31 rated septic service companies in Lake Saint Louis is 4.8★, with a median of 40 reviews. Superior Service has the most, 2,219 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 Lake Saint Louis count in this ranking?
Yes, if they are within 25 mi of the Lake Saint Louis 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 Lake Saint Louis
- November 2026: CR Scores recalculated for 31 septic service companies serving Lake Saint Louis.
More septic service companies and Lake Saint Louis pages
Septic service companies near Lake Saint Louis
- Septic service companies in Dardenne Prairie, MO40 ranked
- Septic service companies in Wentzville, MO24 ranked
- Septic service companies in O'Fallon, MO38 ranked
- Septic service companies in Saint Peters, MO47 ranked
- Septic service companies in Chesterfield, MO63 ranked
- Septic service companies in Wildwood, MO58 ranked
- Septic service companies in Troy, MO9 ranked
- Septic service companies in Saint Charles, MO59 ranked
- Septic service companies in Ballwin, MO62 ranked
- Septic service companies in Maryland Heights, MO63 ranked
Other trades in Lake Saint Louis
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- All contractors in Lake Saint Louis