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Best Septic Service Companies in Mankato, MN (2026)

5 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Mankato: General Rooter of Southern MN - Sewer & Drain Cleaning, CR Score 63/100; 5.0★ from 83 Google reviews; open 7 days a week.

  2. 4

    Most-reviewed: Guaranteed Electric Service, Inc., 24 Google reviews at 3.9★, the most of 5 ranked after General Rooter of Southern MN - Sewer & Drain Cleaning; ranked #4.

Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank

5 Mankato septic service companies are ranked here by CR Score, from ten published factors. 2 open Saturdays and 1 open Sundays, based on posted hours. The median Google rating is 4.7★ across 5 rated businesses.

Top 5 septic service companies in Mankato at a glance

Top 5 septic service companies in Mankato at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1General Rooter of Southern MN - Sewer & Drain Cleaning635.0★ (83)MankatoSat · Sun · EveningsOverall
2Jadd Seppmann & Sons Well & Septic Systems554.7★ (22)Mankato——
3Forrey Septic Systems & Excavating525.0★ (3)MankatoSat—
4Guaranteed Electric Service, Inc.513.9★ (24)Mankato—Most reviews
5St. Peter Well Drilling & Repair494.5★ (18)Saint Peter, 9 mi away——

The 5 best septic service companies in Mankato, ranked

Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.

Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.

How we ranked Mankato septic service companies

We scored 5 Mankato 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.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed fromIn Mankato data
Reputation25%Google star rating, adjusted for how many reviews back itMeasured
Credentials15%Active state license, bond and workers’ comp on fileNot yet collected
Review volume10%Number of Google reviews, compared with the most-reviewed business on the listMeasured
Recency5%Share of reviews from the last 12 monthsNot yet collected
Availability5%Weekly open hours, Saturday, Sunday, 24/7 or same-dayMeasured
Trade focus10%How clearly the business does this trade (its Google category and name)Measured
Proximity5%Based in the city scores highest, less the farther away it isMeasured
Claimed profile10%The business has claimed its ContractorsRanked profile (free or paid earn the same)Measured
Partnered5%The business links to ContractorsRanked from its own website with our badge, checked periodicallyMeasured
ContractorsRanked reviews10%Verified customer reviews collected by ContractorsRanked: their rating and how many there areMeasured

Septic service companies in Mankato: frequently asked questions

Who is the best septic service company in Mankato?

By CR Score, the highest-ranked septic service company in Mankato, MN is General Rooter of Southern MN - Sewer & Drain Cleaning with a CR Score of 63/100. It has 5.0★ from 83 Google reviews. It is open 7 days a week. Jadd Seppmann & Sons Well & Septic Systems (#2) and Forrey Septic Systems & Excavating (#3) follow. We ranked 5 septic service companies on ten factors, last updated November 3, 2026.

How many septic service companies are there in Mankato?

ContractorsRanked ranks 5 septic service companies serving Mankato, MN. 4 of them are based in Mankato; the rest serve it from nearby towns. Counts are as of November 2026.

Which septic service companies in Mankato work on weekends?

2 of 5 ranked septic service companies post Saturday hours and 1 post Sunday hours. The highest-ranked open Saturdays are General Rooter of Southern MN - Sewer & Drain Cleaning (#1) and Forrey Septic Systems & Excavating (#3). Posted hours are office hours; crews may book weekend jobs separately.

What Google rating do Mankato septic service companies have?

The median Google rating among 5 rated septic service companies in Mankato is 4.7★, with a median of 22 reviews. General Rooter of Southern MN - Sewer & Drain Cleaning has the most, 83 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 Mankato count in this ranking?

Yes, if they are within 25 mi of the Mankato 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 Mankato

  1. November 2026: CR Scores recalculated for 5 septic service companies serving Mankato.

More septic service companies and Mankato pages

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