The Best Septic Tank Services in Mankato, MN
We graded 9 companies on seven things customers actually report: satisfaction, reliability, workmanship, value, momentum, track record and how owners handle complaints.
From 26,152 Google reviews of 66 top-rated septic tank services nationwide; 9 of them in Mankato, MN. Updated October 28, 2026.
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Best septic tank services in Mankato for sump pump installation
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SteelPoint PlumbingHow Job match is calculatedBuilt only from reviews Google tagged “Sump pump installation”:Stars on this job 55%5.00★Number of such jobs 25%3Overall Experts Score 20%90Job match= 91Stars are pulled toward the category average (4.87★) when a company has few tagged jobs, so 3 perfect reviews don’t beat 80 great ones. 4.3★ scores 0, 5.0★ scores full. Volume is compared with the busiest company for this job.91Job match = this company’s ★ on reviews Google tagged “Sump pump installation” (shrunk toward the category average when there are few), how many such jobs it has done, and its overall Experts Score.
What customers said about sump pump installation
SteelPoint PlumbingI called Steelpoint on a Sunday evening with a sump pump issue as a new customer. Winter melt and heavy rain. He was ready to come out and replace my pump if needed that minute. He came out and checked my pump and told me my float ball was stuck inside the float mechanism. I was so impressed with his honesty. He…
SteelPoint PlumbingI couldn’t be more pleased with the service I received from Eric at SteelPoint Plumbing. Sent message on Sunday at 5:00 and he responded within a few minutes. It is now Monday, the next day, and he has already taken care of my issues! So grateful. I would highly recommend them.
SteelPoint PlumbingThanks for your help, Eric. You were very fast and responsive to my communications. I was impressed on how professional SteelPoint Plumbing was. They really set the standard for what a plumbing company should be.
Overall ratings
Experts Score 0–100Experts Score (0–100)Absolute quality first: recency-weighted star average (≈54%), share of 1–2★ reviews (≈24%), customers’ price verdicts (≈14%), owner replies to critical reviews (≈7%); minus up to 10 points each for complaints flagged in Google review highlights and for a real slide in recent ratings. Hover a company’s score on its page for the full breakdown. and a letter grade per factor (A = top 20% of septic tank services).
| # | Company | ScoreExperts Score (0–100)Absolute quality first: recency-weighted star average (≈54%), share of 1–2★ reviews (≈24%), customers’ price verdicts (≈14%), owner replies to critical reviews (≈7%); minus up to 10 points each for complaints flagged in Google review highlights and for a real slide in recent ratings. Hover a company’s score on its page for the full breakdown. | FactorsFactor grades, in orderSatisfaction (54%): Recency-weighted star average (2-year half-life), shrunk toward the category mean by review volume; the company’s own lifetime average as the prior; absolute: 4.0★ = 0, 5★ = 100.Reliability (24%): How rarely jobs go badly: share of 1–2★ reviews — 60% the last 24 months (or the 20 newest if fewer), 40% all-time; 0% = 100, 15%+ = 0; the category percentile can only raise it.Craft & service (0%): Google review highlights: Quality, Professionalism, Responsiveness, Punctuality — how rarely reviewers flag them as a negative, per review since highlights began; 0% = 100, 5%+ = 0. Subtracted from the score (up to −10), never averaged in — clean highlights are the norm, not a bonus.Value (14%): Customers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.Momentum (0%): Penalises only a real slide: last-12-month average below lifetime (−0.5★ = 0). Still 4.8★+ over the last year, or steady/improving = 100. Subtracted from the score (up to −10), never averaged in.Replies to reviews (7%): How often the owner publicly replies to reviews under 5★ (1–4★). Needs 3+ such reviews, otherwise not counted; 65% absolute (80%+ replied = 100), the category percentile can only raise it.One letter per factor score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = below 20. | ★Google star rating as shown on Google Maps. | Typical billMedian bill customers of this company reported in their reviews (needs 3+ priced reviews). |
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| 1 |  General Rooter of Southern MN - Sewer & Drain CleaningMankato, MN | A 97How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 59%96+56.3Reliability 26%96+25Value 15%100+15.2Craft & service penalty99−0.1Experts Score= 97Not enough data for replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAA– | 4.97 | — |
| 2 |  DrainLab ServicesMankato, MN | A 97How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 59%96+56.3Reliability 26%97+25.3Value 15%100+15.2Experts Score= 97Not enough data for replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA–AA– | 4.96 | $529 |
| 3 |  Plumb-Rite Plumbing, LLCMankato, MN | A 95How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 59%97+56.9Reliability 26%94+24.5Value 15%100+15.2Craft & service penalty84−1.6Experts Score= 95Not enough data for replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAA– | 4.95 | $548 |
| 4 |  Minnesota Plumbing LLCMankato, MN | A 91How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 59%92+54Reliability 26%84+21.9Value 15%100+15.2Experts Score= 91Not enough data for replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA–AA– | 4.91 | $502 |
| 5 | SteelPoint PlumbingMankato, MN | A 90How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 59%91+53.4Reliability 26%90+23.5Value 15%100+15.2Craft & service penalty75−2.5Experts Score= 90Not enough data for replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AABAA– | 4.89 | $2.6k |
| 6 |  Jetter Clean Advanced Drain CleaningMankato, MN | A 88How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 55%93+50.7Reliability 24%90+21.8Value 14%100+14.1Replies to reviews 7%29+2.1Craft & service penalty94−0.6Experts Score= 88Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAAD | 4.91 | $176 |
| 7 |  Jadd Seppmann & Sons Well & Septic SystemsMankato, MN | A 81How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 64%84+53.4Reliability 28%87+24.6Replies to reviews 8%36+3Experts Score= 81Not enough data for value; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA––AD | 4.75 | — |
| 8 |  Armz PlumbingMankato, MN | B 75How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 55%82+44.7Reliability 24%72+17.5Value 14%66+9.3Replies to reviews 7%93+6.6Craft & service penalty99−0.1Momentum penalty75−2.5Experts Score= 75Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | ABABBA | 4.86 | $542 |
| 9 |  Babe Plumbing Heating and AirMankato, MN | D 34How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 55%48+26.2Reliability 24%20+4.8Value 14%61+8.6Replies to reviews 7%99+7Craft & service penalty69−3.1Momentum penalty0−10Experts Score= 34Grade D: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | CDBBFA | 4.57 | $1.0k |
What jobs cost
What customers paid, from the price Google asks reviewers to report.
| Job | Low25th percentile: 1 in 4 customers paid less than this. | TypicalMedian of the bill customers reported in their Google review (Google asks reviewers for a price range; we use the middle of each range). | High75th percentile: 1 in 4 customers paid more than this. | FairOf customers who rated the price, the share who chose “Great price” or “Reasonable” rather than “Overpriced”. |
|---|---|---|---|---|
| Drain cleaning | $205 | $322 | $478 | 97% |
| Plumbing pipe repair | $305 | $466 | $1.1k | 96% |
| Toilet repair | $209 | $340 | $607 | 96% |
| Plumbing leak detection | $54 | $209 | $495 | 95% |
| Water heater installation | $1.2k | $1.9k | $2.4k | 98% |
| Plumbing leak repair | $248 | $414 | $1.2k | 96% |
| Faucet repair | $271 | $399 | $659 | 96% |
| Sewer cleaning | $248 | $366 | $529 | 98% |
| Faucet installation | $292 | $486 | $786 | 93% |
| Outdoor plumbing system repair | $321 | $506 | $1.0k | 98% |
| Sewer repair | $383 | $1.2k | $2.1k | 98% |
| Shower repair | $148 | $317 | $469 | 99% |
Septic Tank Services in Mankato, MN at a glance
How the 9 septic tank services we rated in Mankato, MN compare, and what customers praise most.
Experts Score grades
A = score 80+, F = below 20.
- Grade A778%
- Grade B111%
- Grade C00%
- Grade D111%
- Grade F00%
Google ratings
Average stars per company.
- 4.90★ and up556%
- 4.80–4.89★222%
- 4.60–4.79★111%
- Below 4.60★111%
What customers praise
Share of Google review highlights.
- Quality5,05421%
- Professionalism5,91724%
- Responsiveness5,32922%
- Punctuality4,79319%
- Value3,55514%
Was the price fair?
All price verdicts left with reviews.
- Great price1,22928%
- Reasonable2,62560%
- Overpriced1604%
- Not sure3338%
Price verdicts by year
Share calling it great / reasonable / overpriced.
How we grade
Satisfaction (54%) — Recency-weighted star average (2-year half-life), shrunk toward the category mean by review volume; the company’s own lifetime average as the prior; absolute: 4.0★ = 0, 5★ = 100.
Reliability (24%) — How rarely jobs go badly: share of 1–2★ reviews — 60% the last 24 months (or the 20 newest if fewer), 40% all-time; 0% = 100, 15%+ = 0; the category percentile can only raise it.
Craft & service (penalty, up to −10) — Google review highlights: Quality, Professionalism, Responsiveness, Punctuality — how rarely reviewers flag them as a negative, per review since highlights began; 0% = 100, 5%+ = 0. Subtracted from the score (up to −10), never averaged in — clean highlights are the norm, not a bonus.
Value (14%) — Customers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.
Momentum (penalty, up to −10) — Penalises only a real slide: last-12-month average below lifetime (−0.5★ = 0). Still 4.8★+ over the last year, or steady/improving = 100. Subtracted from the score (up to −10), never averaged in.
Replies to reviews (7%) — How often the owner publicly replies to reviews under 5★ (1–4★). Needs 3+ such reviews, otherwise not counted; 65% absolute (80%+ replied = 100), the category percentile can only raise it.