62/100CR Score
Ranked #1 because of its Google rating and review volume: 4.6★ from 25 Google reviews, the most in Mount Vernon.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in Mount Vernon, IL (2026)
7 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Mount Vernon: Lomax Septic Systems, CR Score 62/100; 4.6★ from 25 Google reviews; open Saturdays until 7 PM.
- 2
Most-reviewed: Mt Vernon Sewer & Septic Services, 24 Google reviews at 4.3★, the most of 7 ranked after Lomax Septic Systems; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
7 Mount Vernon septic service companies are ranked here by CR Score, from ten published factors. 1 open Saturdays, based on posted hours. The median Google rating is 4.3★ across 7 rated businesses.
Top 7 septic service companies in Mount Vernon at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Lomax Septic Systems | 62 | 4.6★ (25) | Mount Vernon | Sat · Evenings | Overall |
| 2 | Mt Vernon Sewer & Septic Services | 55 | 4.3★ (24) | Mount Vernon | — | Most reviews |
| 3 | Richview Septics | 54 | 4.3★ (6) | Mount Vernon | — | — |
| 4 | Centralia Sewer Septic & Drain | 49 | 4.0★ (10) | Centralia, 20 mi away | — | — |
| 5 | Fowler Sewer & Septic Services | 48 | 2.3★ (4) | Mount Vernon | — | — |
| 6 | R & R Sewer | 44 | 3.5★ (4) | Centralia, 19 mi away | — | — |
| 7 | Lusch Excavating & Sanitation Inc | 43 | 4.6★ (8) | Salem, 24 mi away | — | — |
The 7 best septic service companies in Mount Vernon, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Mount Vernon
55/100CR ScoreRanked #2 because of its Google rating and review volume: 4.3★ from 24 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Mount Vernon
54/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.3★ 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 Centralia, 20 mi away
49/100CR ScoreRanked #4 because of its Google rating and review volume: 4.0★ from 10 Google reviews.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Mount Vernon
48/100CR ScoreRanked #5 because of its Google rating and trade focus: 2.3★ from 4 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#6 R & R Sewer
Based in Centralia, 19 mi away
44/100CR ScoreRanked #6 because of its Google rating and trade focus: 3.5★ from 4 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Salem, 24 mi away
43/100CR ScoreRanked #7 because of its Google rating and review volume: 4.6★ from 8 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
How we ranked Mount Vernon septic service companies
We scored 7 Mount Vernon 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 Mount Vernon 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 Mount Vernon: frequently asked questions
Who is the best septic service company in Mount Vernon?
By CR Score, the highest-ranked septic service company in Mount Vernon, IL is Lomax Septic Systems with a CR Score of 62/100. It has 4.6★ from 25 Google reviews. It is open Saturdays until 7 PM. Mt Vernon Sewer & Septic Services (#2) and Richview Septics (#3) follow. We ranked 7 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Mount Vernon?
ContractorsRanked ranks 7 septic service companies serving Mount Vernon, IL. 4 of them are based in Mount Vernon; the rest serve it from nearby towns. Counts are as of November 2026.
Which septic service companies in Mount Vernon work on weekends?
1 of 7 ranked septic service companies post Saturday hours. The highest-ranked open Saturdays is Lomax Septic Systems (#1). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Mount Vernon septic service companies have?
The median Google rating among 7 rated septic service companies in Mount Vernon is 4.3★, with a median of 8 reviews. Lomax Septic Systems has the most, 25 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 Mount Vernon count in this ranking?
Yes, if they are within 25 mi of the Mount Vernon 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 Mount Vernon
- November 2026: CR Scores recalculated for 7 septic service companies serving Mount Vernon.
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