60/100CR Score
Ranked #1 because of its Google rating and review volume: 5.0★ from 42 Google reviews, the most in Knoxville.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in Knoxville, IA (2026)
8 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Knoxville: Certified Septic Service, CR Score 60/100; 5.0★ from 42 Google reviews.
- 2
Best for emergencies (open 24/7): JV Septic Service, posts 24/7 hours; ranked #2 of 8.
- 4
Most-reviewed: Bob's Drain Cleaning & Handyman Service, 41 Google reviews at 5.0★, the most of 8 ranked after Certified Septic Service; ranked #4.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
8 Knoxville septic service companies are ranked here by CR Score, from ten published factors. 2 are open 24/7, 3 open Saturdays and 2 open Sundays, based on posted hours. The median Google rating is 5.0★ across 8 rated businesses.
Top 8 septic service companies in Knoxville at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Certified Septic Service | 60 | 5.0★ (42) | Des Moines, 14 mi away | — | Overall |
| 2 | JV Septic Service | 60 | 5.0★ (19) | Oskaloosa, 24 mi away | 24/7 | Emergencies |
| 3 | Miller Drain and Sewer Service | 59 | 5.0★ (21) | Newton, 13 mi away | 24/7 | — |
| 4 | Bob's Drain Cleaning & Handyman Service | 59 | 5.0★ (41) | Knoxville | Sat | Most reviews |
| 5 | Forest Septic Tank Services | 52 | 5.0★ (4) | Indianola, 23 mi away | — | — |
| 6 | Indianola Precast Concrete | 51 | 4.3★ (6) | Indianola, 23 mi away | — | — |
| 7 | Bassett Excavating Incorporated | 49 | 5.0★ (3) | Knoxville | — | — |
| 8 | Meland Co. Septic Service & Excavating | 48 | 3.3★ (8) | Oskaloosa, 25 mi away | — | — |
The 8 best septic service companies in Knoxville, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Oskaloosa, 24 mi away
60/100CR ScoreRanked #2 because of its Google rating and trade focus: 5.0★ 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 Newton, 13 mi away
59/100CR ScoreRanked #3 because of its Google rating and review volume: 5.0★ from 21 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Knoxville
59/100CR ScoreRanked #4 because of its Google rating and review volume: 5.0★ from 41 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Indianola, 23 mi away
52/100CR ScoreRanked #5 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Indianola, 23 mi away
51/100CR ScoreRanked #6 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 Knoxville
49/100CR ScoreRanked #7 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Excavating contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oskaloosa, 25 mi away
48/100CR ScoreRanked #8 because of its Google rating and trade focus: 3.3★ from 8 Google reviews, listed on Google as “General contractor”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
How we ranked Knoxville septic service companies
We scored 8 Knoxville 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 Knoxville 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 Knoxville: frequently asked questions
Who is the best septic service company in Knoxville?
By CR Score, the highest-ranked septic service company in Knoxville, IA is Certified Septic Service with a CR Score of 60/100. It has 5.0★ from 42 Google reviews. JV Septic Service (#2) and Miller Drain and Sewer Service (#3) follow. We ranked 8 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Knoxville?
ContractorsRanked ranks 8 septic service companies serving Knoxville, IA. 2 of them are based in Knoxville; the rest serve it from nearby towns. Counts are as of November 2026.
Which septic service companies in Knoxville are open 24/7?
2 ranked septic service companies in Knoxville post 24/7 hours. The highest-ranked are JV Septic Service (#2) and Miller Drain and Sewer Service (#3). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Knoxville work on weekends?
3 of 8 ranked septic service companies post Saturday hours and 2 post Sunday hours. The highest-ranked open Saturdays are JV Septic Service (#2), Miller Drain and Sewer Service (#3) and Bob's Drain Cleaning & Handyman Service (#4). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Knoxville septic service companies have?
The median Google rating among 8 rated septic service companies in Knoxville is 5.0★, with a median of 14 reviews. Certified Septic Service has the most, 42 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 Knoxville count in this ranking?
Yes, if they are within 25 mi of the Knoxville 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 Knoxville
- November 2026: CR Scores recalculated for 8 septic service companies serving Knoxville.
More septic service companies and Knoxville pages
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