60/100CR Score
Ranked #1 because of its Google rating and trade focus: 5.0★ from 103 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in Largo, MD (2026)
71 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Largo: Shilling septic, CR Score 60/100; 5.0★ from 103 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): RS Plumbing LLC, posts 24/7 hours; ranked #2 of 71.
- 10
Most-reviewed: Prime Plumbing, 2,323 Google reviews at 4.8★, the most of 71 ranked; ranked #10.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
71 Largo septic service companies are ranked here by CR Score, from ten published factors. 30 are open 24/7, 48 open Saturdays and 34 open Sundays, based on posted hours. The median Google rating is 4.9★ across 71 rated businesses.
Top 10 septic service companies in Largo at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Shilling septic | 60 | 5.0★ (103) | Baltimore, 14 mi away | 24/7 | Overall |
| 2 | RS Plumbing LLC | 60 | 5.0★ (51) | Davidsonville, 9 mi away | 24/7 | Emergencies |
| 3 | A & V Septic Services LLC | 59 | 4.9★ (210) | Pasadena, 21 mi away | 24/7 | — |
| 4 | A-1 Septic | 59 | 4.9★ (282) | Pasadena, 23 mi away | 24/7 | — |
| 5 | Sunrise Septic Service | 59 | 5.0★ (79) | Landover, 16 mi away | 24/7 | — |
| 6 | The Drain Fighter - Jetting & Drain Cleaning | 58 | 4.9★ (484) | Washington, D.C., 4 mi away | 24/7 | — |
| 7 | B & P Environmental, A Wind River Company | 58 | 5.0★ (19) | Crofton, 11 mi away | 24/7 | — |
| 8 | Southern Shores Septic & Excavating | 57 | 5.0★ (109) | Waldorf, 13 mi away | Sat | — |
| 9 | District Capital Services LLC | 56 | 4.9★ (269) | Washington, D.C., 10 mi away | 24/7 | — |
| 10 | Prime Plumbing | 56 | 4.8★ (2,323) | Glen Burnie, 22 mi away | 24/7 | Most reviews |
The 71 best septic service companies in Largo, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Davidsonville, 9 mi away
60/100CR ScoreRanked #2 because of its Google rating and trade focus: 5.0★ from 51 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pasadena, 21 mi away
59/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.9★ from 210 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#4 A-1 Septic
Based in Pasadena, 23 mi away
59/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.9★ from 282 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Landover, 16 mi away
59/100CR ScoreRanked #5 because of its Google rating and trade focus: 5.0★ from 79 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Washington, D.C., 4 mi away
58/100CR ScoreRanked #6 because of its Google rating and review volume: 4.9★ from 484 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Crofton, 11 mi away
58/100CR ScoreRanked #7 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 Waldorf, 13 mi away
57/100CR ScoreRanked #8 because of its Google rating and trade focus: 5.0★ from 109 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Washington, D.C., 10 mi away
56/100CR ScoreRanked #9 because of its Google rating and review volume: 4.9★ from 269 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
#10 Prime Plumbing
Based in Glen Burnie, 22 mi away
56/100CR ScoreRanked #10 because of its Google rating and review volume: 4.8★ from 2,323 Google reviews, the most in Largo.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Arnold, 10 mi away
55/100CR ScoreRanked #11 because of its Google rating and review volume: 5.0★ from 163 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
#12 Howard Plumbing
Based in Annapolis, 17 mi away
55/100CR ScoreRanked #12 because of its Google rating and review volume: 4.9★ from 521 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Bowie, 7 mi away
55/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.7★ from 31 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Springfield, 23 mi away
55/100CR ScoreRanked #14 because of its Google rating and trade focus: 5.0★ from 181 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#15 Sewer Slayer
Based in Arbutus, 23 mi away
55/100CR ScoreRanked #15 because of its Google rating and trade focus: 5.0★ from 157 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Arlington, 16 mi away
54/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.8★ from 80 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Rosaryville, 21 mi away
54/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.7★ from 15 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pasadena, 22 mi away
54/100CR ScoreRanked #18 because of its Google rating and trade focus: 5.0★ from 13 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Alexandria, 16 mi away
54/100CR ScoreRanked #19 because of its Google rating and trade focus: 5.0★ from 41 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#20 Shilling Septic
Based in Lake Shore, 23 mi away
54/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.6★ 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 Landover, 2 mi away
54/100CR ScoreRanked #21 because of its Google rating and trade focus: 3.8★ from 4 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Rosaryville, 22 mi away
53/100CR ScoreRanked #22 because of its Google rating and trade focus: 4.9★ from 48 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Alexandria, 13 mi away
53/100CR ScoreRanked #23 because of its Google rating and review volume: 4.7★ from 159 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Annapolis, 6 mi away
53/100CR ScoreRanked #24 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pasadena, 24 mi away
53/100CR ScoreRanked #25 because of its Google rating and trade focus: 4.7★ from 12 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Septic service companies ranked #26 to #50
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 71 ranked septic service companies here; the rest are on their profiles.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Robert F Beall & Sons Inc | 53 | 4.4★ (43) | 16 mi |
| 27 | ACE Septic Service | 53 | 4.3★ (13) | 24 mi |
| 28 | Abend Services | 52 | 4.9★ (146) | 20 mi |
| 29 | B.L. James & Son | 52 | 4.9★ (383) | 14 mi |
| 30 | MCS Pumping | 52 | 5.0★ (8) | 20 mi |
| 31 | All About Septics | 52 | 5.0★ (5) | 24 mi |
| 32 | Outback Porta Jon Inc | 52 | 4.7★ (73) | 19 mi |
| 33 | Freestate Septic | 52 | 4.5★ (22) | 10 mi |
| 34 | Annapolis Septic Service | 51 | 5.0★ (21) | 17 mi |
| 35 | Castro Home Services Inc | 51 | 4.7★ (63) | 16 mi |
| 36 | Abend Services | 51 | 4.8★ (175) | 24 mi |
| 37 | Scardina Home Services | 51 | 4.5★ (473) | 19 mi |
| 38 | Bayly's Septic Tank Cleaning | 51 | 5.0★ (16) | 18 mi |
| 39 | Duncans Septic Service | 51 | 4.7★ (18) | 24 mi |
| 40 | Sams Creek | 50 | 4.9★ (41) | 23 mi |
| 41 | Cotton's Septic | 50 | 4.0★ (24) | 18 mi |
| 42 | AJ McDonald Company | 50 | 5.0★ (109) | 22 mi |
| 43 | Ruth Plumbing, Heating & Cooling | 50 | 4.5★ (53) | 5 mi |
| 44 | Rooter-Man | 50 | 5.0★ (63) | 19 mi |
| 45 | c6 Environmental | 50 | 5.0★ (8) | 23 mi |
| 46 | Priority Plumbing & Drain | 50 | 4.9★ (308) | 22 mi |
| 47 | Clean Water Environmental | 50 | 4.2★ (5) | 18 mi |
| 48 | Fanatic Inspection Services | 49 | 5.0★ (25) | 7 mi |
| 49 | Maryland Sewer & Plumbing Service Inc | 49 | 4.9★ (239) | 25 mi |
| 50 | Billing's Outback Septic Service | 49 | 4.5★ (18) | 20 mi |
Also serving Largo
18 more septic service companies within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| Accurate Environmental Services | 9 mi | |
| Adams-Liming Septic Tank Services | 17 mi | |
| B&C Sewer and Drains Inc | 8 mi | |
| Beetle Bayly Services | 1.0★ (1) | 14 mi |
| Capital City Sewer Services Inc | 5.0★ (1) | 22 mi |
| Clinton Sewer Expert, Inc. | 5 mi | |
| J & L Plumbing | 5.0★ (2) | 22 mi |
| King & Sons Inc LLC | 1.0★ (1) | 20 mi |
| Lee's Septic Tank Services | 9 mi | |
| MB Matthews Septic Service LLC | 5.0★ (1) | 21 mi |
| Pasadena Septic Service | 18 mi | |
| Plumbing - Clogged Drains & Sewer Pipes | 5.0★ (1) | 19 mi |
| Rei Drayco | 3.0★ (1) | 4 mi |
| Rocket Rooter Plumbing | 3.0★ (2) | 24 mi |
| Septic Locator | 13 mi | |
| Severn Septic Service | 17 mi | |
| Ultimate Septic & Construction | 23 mi | |
| United Site Services | 1.0★ (2) | 22 mi |
How we ranked Largo septic service companies
We scored 71 Largo 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 Largo 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 Largo: frequently asked questions
Who is the best septic service company in Largo?
By CR Score, the highest-ranked septic service company in Largo, MD is Shilling septic with a CR Score of 60/100. It has 5.0★ from 103 Google reviews. It is open 24/7. RS Plumbing LLC (#2) and A & V Septic Services LLC (#3) follow. We ranked 71 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Largo?
ContractorsRanked ranks 71 septic service companies serving Largo, MD. Another 18 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Largo are open 24/7?
30 ranked septic service companies in Largo post 24/7 hours. The highest-ranked are Shilling septic (#1), RS Plumbing LLC (#2) and A & V Septic Services LLC (#3). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Largo work on weekends?
48 of 71 ranked septic service companies post Saturday hours and 34 post Sunday hours. The highest-ranked open Saturdays are Shilling septic (#1), RS Plumbing LLC (#2) and A & V Septic Services LLC (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Largo septic service companies have?
The median Google rating among 71 rated septic service companies in Largo is 4.9★, with a median of 25 reviews. Prime Plumbing has the most, 2,323 reviews, and ranks #10. 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 Largo count in this ranking?
Yes, if they are within 25 mi of the Largo 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 Largo
- November 2026: CR Scores recalculated for 71 septic service companies serving Largo.
- November 2026: 1 duplicate listing merged.
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