59/100CR Score
Ranked #1 because of its Google rating and trade focus: 5.0★ from 237 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 Clayton, MO (2026)
74 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Clayton: Nolen Septic Services, CR Score 59/100; 5.0★ from 237 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 74.
- 2
Most-reviewed: Mr. Rooter Plumbing of St. Louis, 2,141 Google reviews at 4.8★, the most of 74 ranked; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
74 Clayton septic service companies are ranked here by CR Score, from ten published factors. 17 are open 24/7, 38 open Saturdays and 28 open Sundays, based on posted hours. The median Google rating is 4.7★ across 74 rated businesses.
Most of this list also appears on the Septic service companies in University City ranking. See Septic service companies in University City
Top 10 septic service companies in Clayton at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Nolen Septic Services | 59 | 5.0★ (237) | Edwardsville, 23 mi away | 24/7 | Overall |
| 2 | Mr. Rooter Plumbing of St. Louis | 59 | 4.8★ (2,141) | Ballwin, 10 mi away | 24/7 | Emergencies, Most reviews |
| 3 | Maplewood Plumbing & Sewer, LLC. | 57 | 4.8★ (1,691) | St. Louis, 3 mi away | — | — |
| 4 | River City Sewer& Drain, L.L.C. | 57 | 4.9★ (207) | Arnold, 14 mi away | 24/7 | — |
| 5 | Pierson Plumbing Sewer & Drain L.L.C | 56 | 4.8★ (169) | Saint Charles, 13 mi away | 24/7 | — |
| 6 | Superior Service | 56 | 4.9★ (1,766) | Chesterfield, 16 mi away | Sat · Sun · Evenings | — |
| 7 | Mitchell Environmental | 55 | 5.0★ (212) | Belleville, 18 mi away | — | — |
| 8 | Shults Septic Service, LLC | 55 | 5.0★ (15) | Belleville, 19 mi away | 24/7 | — |
| 9 | St Louis Sewer & Drain Cleaning Services LLC | 55 | 4.9★ (321) | Godfrey, 12 mi away | Sat | — |
| 10 | Shamrock Sewer & Drain | 55 | 4.8★ (304) | Pacific, 24 mi away | 24/7 | — |
The 74 best septic service companies in Clayton, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Ballwin, 10 mi away
59/100CR ScoreRanked #2 because of its Google rating and review volume: 4.8★ from 2,141 Google reviews, the most in Clayton.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Louis, 3 mi away
57/100CR ScoreRanked #3 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 Arnold, 14 mi away
57/100CR ScoreRanked #4 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.
Based in Saint Charles, 13 mi away
56/100CR ScoreRanked #5 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, 16 mi away
56/100CR ScoreRanked #6 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 Belleville, 18 mi away
55/100CR ScoreRanked #7 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.
Based in Belleville, 19 mi away
55/100CR ScoreRanked #8 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 Godfrey, 12 mi away
55/100CR ScoreRanked #9 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 Pacific, 24 mi away
55/100CR ScoreRanked #10 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, 8 mi away
54/100CR ScoreRanked #11 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 Saint Ann, 7 mi away
54/100CR ScoreRanked #12 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 Saint Peters, 17 mi away
54/100CR ScoreRanked #13 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 St. Louis, 6 mi away
54/100CR ScoreRanked #14 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 St. Louis, 5 mi away
54/100CR ScoreRanked #15 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, 3 mi away
54/100CR ScoreRanked #16 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 St. Louis, 10 mi away
54/100CR ScoreRanked #17 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 Chesterfield, 17 mi away
54/100CR ScoreRanked #18 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, 6 mi away
53/100CR ScoreRanked #19 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.
#20 V1 Environmental
Based in Collinsville, 21 mi away
53/100CR ScoreRanked #20 because of its Google rating and trade focus: 5.0★ from 84 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#21 The Sewer Pros
Based in Chesterfield, 17 mi away
53/100CR ScoreRanked #21 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 Webster Groves, 6 mi away
53/100CR ScoreRanked #22 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 St. Louis, 4 mi away
52/100CR ScoreRanked #23 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.
Based in St. Louis, 10 mi away
52/100CR ScoreRanked #24 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 Creve Coeur, 9 mi away
52/100CR ScoreRanked #25 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.
How we ranked Clayton septic service companies
We scored 74 Clayton 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 Clayton 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 Clayton: frequently asked questions
Who is the best septic service company in Clayton?
By CR Score, the highest-ranked septic service company in Clayton, MO is Nolen Septic Services with a CR Score of 59/100. It has 5.0★ from 237 Google reviews. It is open 24/7. Mr. Rooter Plumbing of St. Louis (#2) and Maplewood Plumbing & Sewer, LLC. (#3) follow. We ranked 74 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Clayton?
ContractorsRanked ranks 74 septic service companies serving Clayton, MO. Counts are as of November 2026.
Which septic service companies in Clayton are open 24/7?
17 ranked septic service companies in Clayton post 24/7 hours. The highest-ranked are Nolen Septic Services (#1), Mr. Rooter Plumbing of St. Louis (#2) and River City Sewer& Drain, L.L.C. (#4). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Clayton work on weekends?
38 of 74 ranked septic service companies post Saturday hours and 28 post Sunday hours. The highest-ranked open Saturdays are Nolen Septic Services (#1), Mr. Rooter Plumbing of St. Louis (#2) and River City Sewer& Drain, L.L.C. (#4). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Clayton septic service companies have?
The median Google rating among 74 rated septic service companies in Clayton 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 Clayton count in this ranking?
Yes, if they are within 25 mi of the Clayton 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 Clayton
- November 2026: CR Scores recalculated for 74 septic service companies serving Clayton.
- November 2026: 1 duplicate listing merged.
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