60/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.9★ from 207 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in Oakville, MO (2026)
71 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Oakville: River City Sewer& Drain, L.L.C., CR Score 60/100; 4.9★ from 207 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Mr. Rooter Plumbing of St. Louis, posts 24/7 hours; ranked #2 of 71.
- 2
Most-reviewed: Mr. Rooter Plumbing of St. Louis, 2,141 Google reviews at 4.8★, the most of 71 ranked; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
71 Oakville septic service companies are ranked here by CR Score, from ten published factors. 14 are open 24/7, 34 open Saturdays and 24 open Sundays, based on posted hours. The median Google rating is 4.7★ across 71 rated businesses.
Top 10 septic service companies in Oakville at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | River City Sewer& Drain, L.L.C. | 60 | 4.9★ (207) | Arnold, 4 mi away | 24/7 | Overall |
| 2 | Mr. Rooter Plumbing of St. Louis | 59 | 4.8★ (2,141) | Ballwin, 9 mi away | 24/7 | Emergencies, Most reviews |
| 3 | Shults Septic Service, LLC | 57 | 5.0★ (15) | Belleville, 12 mi away | 24/7 | — |
| 4 | Oberkramer Septic Solutions, LLC | 56 | 5.0★ (105) | Wildwood, 19 mi away | — | — |
| 5 | Maplewood Plumbing & Sewer, LLC. | 56 | 4.8★ (1,691) | St. Louis, 10 mi away | — | — |
| 6 | DRD Environmental Septic System Design | 56 | 4.8★ (19) | St. Louis, 4 mi away | Sat | — |
| 7 | Shamrock Sewer & Drain | 55 | 4.8★ (304) | Pacific, 22 mi away | 24/7 | — |
| 8 | All Purpose Sewer & Drain Clng | 55 | 4.7★ (23) | Sappington, 6 mi away | 24/7 | — |
| 9 | Mitchell Environmental | 55 | 5.0★ (212) | Belleville, 20 mi away | — | — |
| 10 | Superior Service | 55 | 4.9★ (1,766) | Chesterfield, 22 mi away | Sat · Sun · Evenings | — |
The 71 best septic service companies in Oakville, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Ballwin, 9 mi away
59/100CR ScoreRanked #2 because of its Google rating and review volume: 4.8★ from 2,141 Google reviews, the most in Oakville.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Belleville, 12 mi away
57/100CR ScoreRanked #3 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 Wildwood, 19 mi away
56/100CR ScoreRanked #4 because of its Google rating and trade focus: 5.0★ from 105 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in St. Louis, 10 mi away
56/100CR ScoreRanked #5 because of its Google rating and review volume: 4.8★ from 1,691 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Louis, 4 mi away
56/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.8★ from 19 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pacific, 22 mi away
55/100CR ScoreRanked #7 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 Sappington, 6 mi away
55/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.7★ from 23 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Belleville, 20 mi away
55/100CR ScoreRanked #9 because of its Google rating and trade focus: 5.0★ from 212 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#10 Superior Service
Based in Chesterfield, 22 mi away
55/100CR ScoreRanked #10 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 Saint Charles, 23 mi away
54/100CR ScoreRanked #11 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 St. Louis, 7 mi away
53/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.8★ from 183 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Godfrey, 19 mi away
53/100CR ScoreRanked #13 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 Arnold, 5 mi away
53/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.0★ from 105 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Arnold, 13 mi away
53/100CR ScoreRanked #15 because of its Google rating and trade focus: 5.0★ from 77 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Chesterfield, 23 mi away
52/100CR ScoreRanked #16 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 Kirkwood, 10 mi away
52/100CR ScoreRanked #17 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 Webster Groves, 7 mi away
52/100CR ScoreRanked #18 because of its Google rating and availability: 4.6★ from 31 Google reviews, open 24/7.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Wildwood, 20 mi away
52/100CR ScoreRanked #19 because of its Google rating and trade focus: 4.2★ from 56 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
#20 Sewer-Oscopy
Based in St. Louis, 1 mi away
52/100CR ScoreRanked #20 because of its Google rating and trade focus: 3.9★ from 30 Google reviews, listed on Google as “Plumber”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in St. Louis, 16 mi away
51/100CR ScoreRanked #21 because of its Google rating and trade focus: 4.6★ from 14 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Louis, 8 mi away
51/100CR ScoreRanked #22 because of its Google rating and trade focus: 4.3★ from 15 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#23 The Sewer Pros
Based in Chesterfield, 23 mi away
51/100CR ScoreRanked #23 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 Saint Ann, 18 mi away
51/100CR ScoreRanked #24 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 Waterloo, 18 mi away
51/100CR ScoreRanked #25 because of its Google rating and trade focus: 4.7★ from 40 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 71 ranked septic service companies here; the rest are on their profiles.
Also serving Oakville
15 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 |
|---|---|---|
| Biologix Products Group | 5.0★ (1) | 16 mi |
| Burke Plumbing | 20 mi | |
| C C Drain & Sewer Cleaning Co | 22 mi | |
| D-A-C Home Inspections | 5.0★ (1) | 22 mi |
| Drain Cleaning St Louis | 5.0★ (1) | 7 mi |
| E Plumbing and Sewer | 5.0★ (2) | 13 mi |
| Eco Septic Tank Pumping St Louis | 15 mi | |
| Eleven Eleven Excavating LLC | 5.0★ (1) | 12 mi |
| H & H Sewer & Pipe Cleaning | 5.0★ (1) | 6 mi |
| Landis Environmental Sewer Services | 5.0★ (1) | 21 mi |
| Mario's Sewer & Drain Cleaning, LLC | 14 mi | |
| Mega Rooter sewer and Drain LLC | 19 mi | |
| Miller Septic | 5.0★ (1) | 16 mi |
| Ross Excavating | 24 mi | |
| Royale Sewer and drains | 13 mi |
How we ranked Oakville septic service companies
We scored 71 Oakville 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 Oakville 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 Oakville: frequently asked questions
Who is the best septic service company in Oakville?
By CR Score, the highest-ranked septic service company in Oakville, MO is River City Sewer& Drain, L.L.C. with a CR Score of 60/100. It has 4.9★ from 207 Google reviews. It is open 24/7. Mr. Rooter Plumbing of St. Louis (#2) and Shults Septic Service, LLC (#3) follow. We ranked 71 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Oakville?
ContractorsRanked ranks 71 septic service companies serving Oakville, MO. Another 15 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Oakville are open 24/7?
14 ranked septic service companies in Oakville post 24/7 hours. The highest-ranked are River City Sewer& Drain, L.L.C. (#1), Mr. Rooter Plumbing of St. Louis (#2) and Shults Septic Service, LLC (#3). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Oakville work on weekends?
34 of 71 ranked septic service companies post Saturday hours and 24 post Sunday hours. The highest-ranked open Saturdays are River City Sewer& Drain, L.L.C. (#1), Mr. Rooter Plumbing of St. Louis (#2) and Shults Septic Service, LLC (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Oakville septic service companies have?
The median Google rating among 71 rated septic service companies in Oakville is 4.7★, with a median of 23 reviews. Mr. Rooter Plumbing of St. Louis has the most, 2,141 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 Oakville count in this ranking?
Yes, if they are within 25 mi of the Oakville 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 Oakville
- November 2026: CR Scores recalculated for 71 septic service companies serving Oakville.
- November 2026: 1 duplicate listing merged.
More septic service companies and Oakville pages
Septic service companies near Oakville
- Septic service companies in Mehlville, MO75 ranked
- Septic service companies in Lemay, MO76 ranked
- Septic service companies in Arnold, MO64 ranked
- Septic service companies in Concord, MO74 ranked
- Septic service companies in Affton, MO75 ranked
- Septic service companies in Crestwood, MO73 ranked
- Septic service companies in Webster Groves, MO75 ranked
- Septic service companies in Kirkwood, MO71 ranked
- Septic service companies in Clayton, MO74 ranked
- Septic service companies in St. Louis, MO74 ranked
Other trades in Oakville
- Roofers in Oakville704 ranked
- Plumbers in Oakville308 ranked
- Electricians in Oakville234 ranked
- HVAC contractors in Oakville407 ranked
- General contractors in Oakville524 ranked
- Painters in Oakville171 ranked
- Landscapers in Oakville191 ranked
- Handymen in Oakville94 ranked
- Kitchen remodelers in Oakville295 ranked
- Bathroom remodelers in Oakville298 ranked
- Flooring contractors in Oakville221 ranked
- Tile installers in Oakville46 ranked
- Drywall contractors in Oakville26 ranked
- Concrete contractors in Oakville225 ranked
- Fence contractors in Oakville108 ranked
- Deck builders in Oakville159 ranked
- Siding contractors in Oakville296 ranked
- Window installers in Oakville202 ranked
- Gutter installers in Oakville228 ranked
- Insulation contractors in Oakville46 ranked
- Solar installers in Oakville64 ranked
- Garage door repair companies in Oakville98 ranked
- Foundation repair companies in Oakville79 ranked
- Tree services in Oakville244 ranked
- Masonry contractors in Oakville143 ranked
- Water damage restoration companies in Oakville269 ranked
- Home builders in Oakville242 ranked
- Demolition contractors in Oakville53 ranked
- Window cleaners in Oakville48 ranked
- Pressure washing companies in Oakville75 ranked
- Pest control companies in Oakville102 ranked
- Paving contractors in Oakville104 ranked
- Auto glass repair shops in Oakville113 ranked
- Excavating contractors in Oakville77 ranked
- Pool builders in Oakville118 ranked
- All contractors in Oakville