The Best Septic Tank Services in Maryland
We graded 7 companies on seven things customers actually report: satisfaction, reliability, workmanship, value, momentum, track record and how owners handle complaints.
From 36,705 Google reviews of 82 top-rated septic tank services nationwide; 7 of them in Maryland. Updated November 5, 2026.
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Best septic tank services in Maryland for outdoor plumbing system repair
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Service Force PlumbingHow Job match is calculatedBuilt only from reviews Google tagged “Outdoor plumbing system repair”:Stars on this job 55%5.00★Number of such jobs 25%26Overall Experts Score 20%90Job match= 96Stars are pulled toward the category average (4.89★) 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.96
Heil Plumbing & HVACHow Job match is calculatedBuilt only from reviews Google tagged “Outdoor plumbing system repair”:Stars on this job 55%5.00★Number of such jobs 25%21Overall Experts Score 20%95Job match= 95Stars are pulled toward the category average (4.89★) 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.95
King & Sons Septic Service, LLCHow Job match is calculatedBuilt only from reviews Google tagged “Outdoor plumbing system repair”:Stars on this job 55%5.00★Number of such jobs 25%13Overall Experts Score 20%98Job match= 91Stars are pulled toward the category average (4.89★) 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.91
Service Force PlumbingHow Job match is calculatedBuilt only from reviews Google tagged “Outdoor plumbing system repair”:Stars on this job 55%5.00★Number of such jobs 25%6Overall Experts Score 20%94Job match= 84Stars are pulled toward the category average (4.89★) 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.84
Roto-Rooter Plumbing & Water CleanupHow Job match is calculatedBuilt only from reviews Google tagged “Outdoor plumbing system repair”:Stars on this job 55%4.29★Number of such jobs 25%7Overall Experts Score 20%73Job match= 55Stars are pulled toward the category average (4.89★) 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.55Job match = this company’s ★ on reviews Google tagged “Outdoor plumbing system repair” (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 outdoor plumbing system repair
Service Force PlumbingJoe, Kameron and Chris were so easy to work with. I was able to get next day service. The issue was resolved quickly. Kameron is so knowledgeable and did a great job. I will definitely be using them Again for all plumbing needs. A++
King & Sons Septic Service, LLCThese guys were great. Friendly service, responsive, accommodating. They took the time to fix the lawn after they finished working and were extremely considerate the entire time. I will be using them for any future septic work.
Roto-Rooter Plumbing & Water Clea…I can’t recommend Vicente highly enough! I had a plumbing emergency with my outdoor faucets, and he stepped in and saved the day. He was incredibly professional, walking me through the entire repair process so I understood exactly what was being done. His handiwork is top-tier, and he went above and beyond to ensure…
Heil Plumbing & HVACAs a GC building my own house, I’ve worked with many contractors, and the technicians from Heil Plumbing are among the best I’ve seen. The lead technician, John, demonstrated extensive knowledge and was very patient in answering all of my questions. I will definitely use Heil Plumbing again in the future and highly…
Service Force PlumbingIt was pleasure working with the team at Service Force Plumbing on our challenging sewage line repair (indoor/outdoor). They know what they are doing and work efficiently and professionally! They do complex technical work in-house rather than subcontracting as other companies tend to do. I highly recommend Service Force Plumbing.
Service Force PlumbingService Force came for a second opinion on my sewer main backing up. They were able to come out pretty quickly and dig out/replace the sewer main. The people I worked with were nice and knowledgeable and got the repair done fast. My only minor issue was that they were supposed to seed and straw after the job was…
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). |
|---|---|---|---|---|---|
| 1 | King & Sons Septic Service, LLCRockville, MD | A 98How 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%99+54Reliability 24%99+24Value 14%100+14.1Replies to reviews 7%77+5.4Experts Score= 98Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAAB | 4.99 | $292 |
| 2 |  Environmental SepticRockville, MD | A 96How 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%94+24.5Value 15%99+15.1Craft & service penalty99−0.1Experts Score= 96Not 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– | 4.93 | $295 |
| 3 | Heil Plumbing & HVACRockville, MD | 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 55%96+52.4Reliability 24%96+23.3Value 14%98+13.9Replies to reviews 7%78+5.5Craft & service penalty96−0.4Experts Score= 95Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAAB | 4.96 | $608 |
| 4 | Service Force PlumbingRockville, MD | A 94How 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%93+22.5Value 14%98+13.9Replies to reviews 7%100+7.1Experts Score= 94Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAAA | 4.94 | $642 |
| 5 | Service Force PlumbingRockville, MD | 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 55%90+49.1Reliability 24%81+19.6Value 14%100+14.1Replies to reviews 7%100+7.1Experts Score= 90Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAAA | 4.93 | $447 |
| 6 |  Sky PlumbingRockville, MD | 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 55%85+46.4Reliability 24%77+18.7Value 14%100+14.1Replies to reviews 7%65+4.6Craft & service penalty88−1.2Momentum penalty88−1.2Experts Score= 81Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | ABAAAB | 4.86 | — |
| 7 | Roto-Rooter Plumbing & Water CleanupRockville, MD | B 73How 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%80+43.6Reliability 24%74+17.9Value 14%50+7.1Replies to reviews 7%100+7.1Craft & service penalty87−1.3Momentum penalty82−1.8Experts Score= 73Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | ABACAA | 4.80 | $786 |
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 | $228 | $328 | $493 | 97% |
| Plumbing pipe repair | $322 | $493 | $1.1k | 97% |
| Toilet repair | $216 | $351 | $593 | 95% |
| Plumbing leak detection | $104 | $264 | $618 | 96% |
| Sewer cleaning | $271 | $379 | $556 | 98% |
| Water heater installation | $1.2k | $1.9k | $2.4k | 97% |
| Plumbing leak repair | $271 | $454 | $1.1k | 95% |
| Faucet repair | $295 | $429 | $680 | 97% |
| Sewer repair | $393 | $1.2k | $2.1k | 98% |
| Faucet installation | $314 | $529 | $845 | 93% |
| Outdoor plumbing system repair | $328 | $529 | $1.2k | 98% |
| Shower repair | $161 | $317 | $466 | 97% |
Septic Tank Services in Maryland at a glance
How the 7 septic tank services we rated in Maryland compare, and what customers praise most.
Experts Score grades
A = score 80+, F = below 20.
- Grade A686%
- Grade B114%
- Grade C00%
- Grade D00%
- Grade F00%
Google ratings
Average stars per company.
- 4.90★ and up571%
- 4.80–4.89★229%
- 4.60–4.79★00%
- Below 4.60★00%
What customers praise
Share of Google review highlights.
- Quality6,91520%
- Professionalism8,11424%
- Responsiveness7,28221%
- Punctuality6,65120%
- Value5,04215%
Was the price fair?
All price verdicts left with reviews.
- Great price1,53527%
- Reasonable3,54462%
- Overpriced2104%
- Not sure4247%
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.