62/100CR Score
Ranked #1 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.
Best Septic Service Companies in Dundalk, MD (2026)
66 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Dundalk: A-1 Septic, CR Score 62/100; 4.9★ from 282 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): A & V Septic Services LLC, posts 24/7 hours; ranked #2 of 66.
- 3
Most-reviewed: Prime Plumbing, 2,323 Google reviews at 4.8★, the most of 66 ranked; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
66 Dundalk septic service companies are ranked here by CR Score, from ten published factors. 28 are open 24/7, 42 open Saturdays and 33 open Sundays, based on posted hours. The median Google rating is 4.9★ across 66 rated businesses.
Top 10 septic service companies in Dundalk at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | A-1 Septic | 62 | 4.9★ (282) | Pasadena, 10 mi away | 24/7 | Overall |
| 2 | A & V Septic Services LLC | 62 | 4.9★ (210) | Pasadena, 10 mi away | 24/7 | Emergencies |
| 3 | Prime Plumbing | 59 | 4.8★ (2,323) | Glen Burnie, 8 mi away | 24/7 | Most reviews |
| 4 | Chavis Septic Services | 59 | 4.9★ (321) | South Bel Air, 23 mi away | 24/7 | — |
| 5 | Shilling septic | 59 | 5.0★ (103) | Baltimore, 20 mi away | 24/7 | — |
| 6 | Sewer Slayer | 58 | 5.0★ (157) | Arbutus, 10 mi away | 24/7 | — |
| 7 | Arundel Septic Services LLC | 58 | 5.0★ (13) | Pasadena, 9 mi away | 24/7 | — |
| 8 | Tidewater Septic Service LLC | 57 | 5.0★ (76) | Stevensville, 22 mi away | 24/7 | — |
| 9 | Mahon Plumbing | 57 | 4.9★ (268) | Baltimore, 4 mi away | 24/7 | — |
| 10 | ACE Septic Service | 57 | 4.3★ (13) | Pasadena, 7 mi away | 24/7 | — |
The 66 best septic service companies in Dundalk, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Pasadena, 10 mi away
62/100CR ScoreRanked #2 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.
Based in Glen Burnie, 8 mi away
59/100CR ScoreRanked #3 because of its Google rating and review volume: 4.8★ from 2,323 Google reviews, the most in Dundalk.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in South Bel Air, 23 mi away
59/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.9★ from 321 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Baltimore, 20 mi away
59/100CR ScoreRanked #5 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.
#6 Sewer Slayer
Based in Arbutus, 10 mi away
58/100CR ScoreRanked #6 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 Pasadena, 9 mi away
58/100CR ScoreRanked #7 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 Stevensville, 22 mi away
57/100CR ScoreRanked #8 because of its Google rating and trade focus: 5.0★ from 76 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Baltimore, 4 mi away
57/100CR ScoreRanked #9 because of its Google rating and review volume: 4.9★ from 268 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pasadena, 7 mi away
57/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.3★ 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 Pasadena, 10 mi away
57/100CR ScoreRanked #11 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.
Based in Baltimore, 8 mi away
57/100CR ScoreRanked #12 because of its Google rating and review volume: 4.8★ from 1,366 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
#13 RS Plumbing LLC
Based in Davidsonville, 22 mi away
57/100CR ScoreRanked #13 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, 8 mi away
56/100CR ScoreRanked #14 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 Rosedale, 5 mi away
56/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.6★ from 60 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Perry Hall, 11 mi away
56/100CR ScoreRanked #16 because of its Google rating and review volume: 5.0★ from 1,896 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
#17 Abend Services
Based in Baltimore, 6 mi away
56/100CR ScoreRanked #17 because of its Google rating and review volume: 4.8★ from 175 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Crofton, 19 mi away
56/100CR ScoreRanked #18 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 Aberdeen, 23 mi away
56/100CR ScoreRanked #19 because of its Google rating and trade focus: 5.0★ from 35 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#20 Howard Plumbing
Based in Annapolis, 18 mi away
55/100CR ScoreRanked #20 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 Baltimore, 7 mi away
55/100CR ScoreRanked #21 because of its Google rating and review volume: 4.9★ from 1,738 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
#22 Abend Services
Based in Severna Park, 12 mi away
54/100CR ScoreRanked #22 because of its Google rating and review volume: 4.9★ from 146 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in South Bel Air, 17 mi away
54/100CR ScoreRanked #23 because of its Google rating and trade focus: 5.0★ 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, 11 mi away
54/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.7★ from 18 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in South Bel Air, 18 mi away
54/100CR ScoreRanked #25 because of its Google rating and trade focus: 5.0★ from 17 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 66 ranked septic service companies here; the rest are on their profiles.
Also serving Dundalk
17 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 |
|---|---|---|
| A & D Septic Services | 22 mi | |
| Accurate Environmental Services | 20 mi | |
| Allen Plumber Sewer & Drain | 22 mi | |
| Baltimore | 20 mi | |
| Beetle Bayly Services | 1.0★ (1) | 20 mi |
| Bel Air Septic Service | 12 mi | |
| Capital City Sewer Services Inc | 5.0★ (1) | 16 mi |
| Chesapeake Bay Septic Tank | 22 mi | |
| Constipated Drain Sewer | 3.0★ (1) | 3 mi |
| Dennis Bosley Services | 5.0★ (2) | 17 mi |
| Electric EEL Sewer & Drain Cleaning | 11 mi | |
| MB Matthews Septic Service LLC | 5.0★ (1) | 8 mi |
| Parks Septic Sewer & Drain Inc | 5.0★ (1) | 25 mi |
| Pasadena Septic Service | 14 mi | |
| Severn Septic Service | 14 mi | |
| Shahan Enterprises Inc | 5.0★ (2) | 20 mi |
| Ultimate Septic & Construction | 7 mi |
How we ranked Dundalk septic service companies
We scored 66 Dundalk 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 Dundalk 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 Dundalk: frequently asked questions
Who is the best septic service company in Dundalk?
By CR Score, the highest-ranked septic service company in Dundalk, MD is A-1 Septic with a CR Score of 62/100. It has 4.9★ from 282 Google reviews. It is open 24/7. A & V Septic Services LLC (#2) and Prime Plumbing (#3) follow. We ranked 66 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Dundalk?
ContractorsRanked ranks 66 septic service companies serving Dundalk, MD. Another 17 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Dundalk are open 24/7?
28 ranked septic service companies in Dundalk post 24/7 hours. The highest-ranked are A-1 Septic (#1), A & V Septic Services LLC (#2) and Prime Plumbing (#3). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Dundalk work on weekends?
42 of 66 ranked septic service companies post Saturday hours and 33 post Sunday hours. The highest-ranked open Saturdays are A-1 Septic (#1), A & V Septic Services LLC (#2) and Prime Plumbing (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Dundalk septic service companies have?
The median Google rating among 66 rated septic service companies in Dundalk is 4.9★, with a median of 22 reviews. Prime Plumbing has the most, 2,323 reviews, and ranks #3. 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 Dundalk count in this ranking?
Yes, if they are within 25 mi of the Dundalk 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 Dundalk
- November 2026: CR Scores recalculated for 66 septic service companies serving Dundalk.
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