61/100CR 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 Alton, IL (2026)
49 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Alton: Nolen Septic Services, CR Score 61/100; 5.0★ from 237 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Pierson Plumbing Sewer & Drain L.L.C, posts 24/7 hours; ranked #2 of 49.
- 5
Most-reviewed: Maplewood Plumbing & Sewer, LLC., 1,691 Google reviews at 4.8★, 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 Alton septic service companies are ranked here by CR Score, from ten published factors. 10 are open 24/7, 23 open Saturdays and 17 open Sundays, based on posted hours. The median Google rating is 4.6★ across 49 rated businesses.
Most of this list also appears on the Septic service companies in Upper Alton ranking. See Septic service companies in Upper Alton
Top 10 septic service companies in Alton at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Nolen Septic Services | 61 | 5.0★ (237) | Edwardsville, 15 mi away | 24/7 | Overall |
| 2 | Pierson Plumbing Sewer & Drain L.L.C | 55 | 4.8★ (169) | Saint Charles, 19 mi away | 24/7 | Emergencies |
| 3 | Mitchell Environmental | 55 | 5.0★ (212) | Belleville, 20 mi away | — | — |
| 4 | V1 Environmental | 54 | 5.0★ (84) | Collinsville, 18 mi away | — | — |
| 5 | Maplewood Plumbing & Sewer, LLC. | 54 | 4.8★ (1,691) | St. Louis, 20 mi away | — | Most reviews |
| 6 | Gene's Septic Tank Cleaning | 53 | 5.0★ (24) | Upper Alton, 15 mi away | Sat | — |
| 7 | Affordable Sewer Repair By Barley Excavating | 52 | 5.0★ (14) | Edwardsville, 14 mi away | 24/7 | — |
| 8 | St Louis Sewer & Drain Cleaning Services LLC | 52 | 4.9★ (321) | Godfrey, 24 mi away | Sat | — |
| 9 | AA Quick Plumbing And Sewer | 52 | 4.0★ (177) | Saint Ann, 17 mi away | 24/7 | — |
| 10 | All Star Pumping & Sewer Services | 51 | 4.3★ (29) | St. Louis, 15 mi away | 24/7 | — |
The 49 best septic service companies in Alton, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Saint Charles, 19 mi away
55/100CR ScoreRanked #2 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 Belleville, 20 mi away
55/100CR ScoreRanked #3 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 Collinsville, 18 mi away
54/100CR ScoreRanked #4 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.
Based in St. Louis, 20 mi away
54/100CR ScoreRanked #5 because of its Google rating and review volume: 4.8★ from 1,691 Google reviews, the most in Alton.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Upper Alton, 15 mi away
53/100CR ScoreRanked #6 because of its Google rating and trade focus: 5.0★ from 24 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Edwardsville, 14 mi away
52/100CR ScoreRanked #7 because of its Google rating and trade focus: 5.0★ from 14 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Godfrey, 24 mi away
52/100CR ScoreRanked #8 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 Saint Ann, 17 mi away
52/100CR ScoreRanked #9 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, 15 mi away
51/100CR ScoreRanked #10 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, 14 mi away
51/100CR ScoreRanked #11 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.
#12 TMK Plumbing
Based in Godfrey, 10 mi away
50/100CR ScoreRanked #12 because of its Google rating and availability: 5.0★ from 16 Google reviews, open 24/7.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Edwardsville, 8 mi away
50/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.8★ from 6 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#14 Miller Septic
Based in Troy, 22 mi away
50/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.7★ from 19 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, 16 mi away
50/100CR ScoreRanked #15 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 Bridgeton, 15 mi away
50/100CR ScoreRanked #16 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 Belleville, 21 mi away
49/100CR ScoreRanked #17 because of its Google rating and trade focus: 5.0★ 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 East Alton, 5 mi away
49/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.2★ from 41 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Spanish Lake, 17 mi away
49/100CR ScoreRanked #19 because of its Google rating and review volume: 4.9★ from 76 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Florissant, 9 mi away
49/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.7★ from 3 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Creve Coeur, 22 mi away
49/100CR ScoreRanked #21 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 St. Louis, 16 mi away
48/100CR ScoreRanked #22 because of its Google rating and trade focus: 4.8★ from 8 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Granite City, 11 mi away
48/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.4★ from 53 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Kirkwood, 24 mi away
48/100CR ScoreRanked #24 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, 24 mi away
47/100CR ScoreRanked #25 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.
How we ranked Alton septic service companies
We scored 49 Alton 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 Alton 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 Alton: frequently asked questions
Who is the best septic service company in Alton?
By CR Score, the highest-ranked septic service company in Alton, IL is Nolen Septic Services with a CR Score of 61/100. It has 5.0★ from 237 Google reviews. It is open 24/7. Pierson Plumbing Sewer & Drain L.L.C (#2) and Mitchell Environmental (#3) follow. We ranked 49 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Alton?
ContractorsRanked ranks 49 septic service companies serving Alton, IL. Counts are as of November 2026.
Which septic service companies in Alton are open 24/7?
10 ranked septic service companies in Alton post 24/7 hours. The highest-ranked are Nolen Septic Services (#1), Pierson Plumbing Sewer & Drain L.L.C (#2) and Affordable Sewer Repair By Barley Excavating (#7). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Alton work on weekends?
23 of 49 ranked septic service companies post Saturday hours and 17 post Sunday hours. The highest-ranked open Saturdays are Nolen Septic Services (#1), Pierson Plumbing Sewer & Drain L.L.C (#2) and Gene's Septic Tank Cleaning (#6). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Alton septic service companies have?
The median Google rating among 49 rated septic service companies in Alton is 4.6★, with a median of 16 reviews. Maplewood Plumbing & Sewer, LLC. has the most, 1,691 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 Alton count in this ranking?
Yes, if they are within 25 mi of the Alton 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 Alton
- November 2026: CR Scores recalculated for 49 septic service companies serving Alton.
- November 2026: 1 duplicate listing merged.
More septic service companies and Alton pages
Septic service companies near Alton
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