60/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.8★ from 295 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 Merrimack, NH (2026)
70 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Merrimack: Sewer Surgeons, CR Score 60/100; 4.8★ from 295 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Carl's Septic Systems and Services in New Hampshire, posts 24/7 hours; ranked #2 of 70.
- 18
Most-reviewed: New Era Plumbing & HVAC, 1,003 Google reviews at 4.9★, the most of 70 ranked; ranked #18.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
70 Merrimack septic service companies are ranked here by CR Score, from ten published factors. 15 are open 24/7, 26 open Saturdays and 18 open Sundays, based on posted hours. The median Google rating is 4.9★ across 70 rated businesses.
Top 10 septic service companies in Merrimack at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Sewer Surgeons | 60 | 4.8★ (295) | East Concord, 20 mi away | 24/7 | Overall |
| 2 | Carl's Septic Systems and Services in New Hampshire | 60 | 4.8★ (118) | Manchester, 16 mi away | 24/7 | Emergencies |
| 3 | LaFrance Septic Services | 59 | 4.9★ (96) | Salem, 14 mi away | Sat · Sun | — |
| 4 | Hamm Septic Services | 59 | 4.9★ (196) | Hudson, 5 mi away | — | — |
| 5 | East Coast Pipe Service | 57 | 5.0★ (26) | East Concord, 10 mi away | Sat · Sun | — |
| 6 | Maznek Septic Services LLC | 57 | 4.8★ (83) | Bedford, 6 mi away | — | — |
| 7 | Kent Septic LLC | 56 | 4.8★ (287) | Manchester, 15 mi away | — | — |
| 8 | Mr. Rooter Plumbing of Greater New Hampshire | 56 | 4.8★ (897) | Concord, 19 mi away | 24/7 | — |
| 9 | Derry Septic Service | 56 | 5.0★ (67) | Londonderry, 8 mi away | — | — |
| 10 | Felix, A Wind River Company | 56 | 4.9★ (609) | Concord, 19 mi away | 24/7 | — |
The 70 best septic service companies in Merrimack, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Manchester, 16 mi away
60/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.8★ from 118 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Salem, 14 mi away
59/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.9★ from 96 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Hudson, 5 mi away
59/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.9★ from 196 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in East Concord, 10 mi away
57/100CR ScoreRanked #5 because of its Google rating and trade focus: 5.0★ from 26 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Bedford, 6 mi away
57/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.8★ from 83 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Manchester, 15 mi away
56/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.8★ from 287 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Concord, 19 mi away
56/100CR ScoreRanked #8 because of its Google rating and review volume: 4.8★ from 897 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Londonderry, 8 mi away
56/100CR ScoreRanked #9 because of its Google rating and trade focus: 5.0★ from 67 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Concord, 19 mi away
56/100CR ScoreRanked #10 because of its Google rating and review volume: 4.9★ from 609 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Hudson, 5 mi away
56/100CR ScoreRanked #11 because of its Google rating and review volume: 4.9★ from 380 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Merrimack
56/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.6★ from 47 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Nashua, 4 mi away
56/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.8★ from 56 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#14 Curtis Septic
Based in Leominster, 22 mi away
56/100CR ScoreRanked #14 because of its Google rating and trade focus: 5.0★ from 21 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Andover, 21 mi away
55/100CR ScoreRanked #15 because of its Google rating and trade focus: 5.0★ from 16 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Andover, 22 mi away
55/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.6★ from 27 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#17 R M Ratta Corp
Based in Fitchburg, 21 mi away
55/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.9★ from 204 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Dracut, 16 mi away
55/100CR ScoreRanked #18 because of its Google rating and review volume: 4.9★ from 1,003 Google reviews, the most in Merrimack.
Based on 8 of 10 factors; credentials and recency not yet collected.
#19 Sewer Surgeons
Based in Derry, 18 mi away
54/100CR ScoreRanked #19 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 Manchester, 7 mi away
54/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.6★ from 30 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Westford, 17 mi away
54/100CR ScoreRanked #21 because of its Google rating and review volume: 5.0★ from 111 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Manchester, 9 mi away
54/100CR ScoreRanked #22 because of its Google rating and trade focus: 5.0★ from 21 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Manchester, 9 mi away
54/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.7★ from 37 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Windham, 11 mi away
54/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.1★ from 20 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Hampstead, 17 mi away
54/100CR ScoreRanked #25 because of its Google rating and trade focus: 4.8★ from 31 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 70 ranked septic service companies here; the rest are on their profiles.
Also serving Merrimack
20 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-Bee Septic LLC | 5.0★ (1) | In Merrimack |
| Agritec Building & Excavating Contractors | 4.0★ (1) | 24 mi |
| Al's Septic & Excavation | 3.0★ (2) | 9 mi |
| All-Clear Septic Services | 1.0★ (1) | 23 mi |
| Beaver Brook Planning and Design, LLC | 5.0★ (1) | 24 mi |
| Biolex Septic Services | 4 mi | |
| Borough Sewer Services | 4.0★ (1) | 15 mi |
| DoneRight Septic Service | 6 mi | |
| Land Engineering & Envrmntl | 5.0★ (2) | 15 mi |
| Liberty Septic Services, LLC | 5.0★ (1) | 16 mi |
| Milltown Plumbing, Heating, Air Conditioning, Drain Cleaning & Electrical | 8 mi | |
| N P Giroux Excavating LLC | 4.0★ (1) | 24 mi |
| QUIRK Real Estate Sales, Development and Construction | 3.0★ (2) | 17 mi |
| Sandford Surveying and Engineering, Inc. | 5.0★ (1) | 9 mi |
| Sewer Works | 5.0★ (2) | 4 mi |
| Slate Corporation | 5.0★ (1) | 12 mi |
| South Road Designs | 5.0★ (1) | 22 mi |
| Stewart Septic Services | 3.0★ (2) | 15 mi |
| Title 5 Inspection | 5.0★ (1) | 4 mi |
| Wilson Septic Systems & Paving | 5.0★ (1) | 21 mi |
How we ranked Merrimack septic service companies
We scored 70 Merrimack 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 Merrimack 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 Merrimack: frequently asked questions
Who is the best septic service company in Merrimack?
By CR Score, the highest-ranked septic service company in Merrimack, NH is Sewer Surgeons with a CR Score of 60/100. It has 4.8★ from 295 Google reviews. It is open 24/7. Carl's Septic Systems and Services in New Hampshire (#2) and LaFrance Septic Services (#3) follow. We ranked 70 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Merrimack?
ContractorsRanked ranks 70 septic service companies serving Merrimack, NH. 3 of them are based in Merrimack; the rest serve it from nearby towns. Another 20 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Merrimack are open 24/7?
15 ranked septic service companies in Merrimack post 24/7 hours. The highest-ranked are Sewer Surgeons (#1), Carl's Septic Systems and Services in New Hampshire (#2) and Mr. Rooter Plumbing of Greater New Hampshire (#8). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Merrimack work on weekends?
26 of 70 ranked septic service companies post Saturday hours and 18 post Sunday hours. The highest-ranked open Saturdays are Sewer Surgeons (#1), Carl's Septic Systems and Services in New Hampshire (#2) and LaFrance Septic Services (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Merrimack septic service companies have?
The median Google rating among 70 rated septic service companies in Merrimack is 4.9★, with a median of 25 reviews. New Era Plumbing & HVAC has the most, 1,003 reviews, and ranks #18. 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 Merrimack count in this ranking?
Yes, if they are within 25 mi of the Merrimack 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 Merrimack
- November 2026: CR Scores recalculated for 70 septic service companies serving Merrimack.
- November 2026: 1 duplicate listing merged.
More septic service companies and Merrimack pages
Septic service companies near Merrimack
- Septic service companies in Bedford, NH57 ranked
- Septic service companies in Londonderry, NH81 ranked
- Septic service companies in Nashua, NH87 ranked
- Septic service companies in Derry, NH83 ranked
- Septic service companies in Manchester, NH58 ranked
- Septic service companies in Derry Village, NH81 ranked
- Septic service companies in Windham, NH89 ranked
- Septic service companies in Pelham, NH92 ranked
- Septic service companies in Salem, NH89 ranked
- Septic service companies in Concord, NH39 ranked
Other trades in Merrimack
- Roofers in Merrimack835 ranked
- Plumbers in Merrimack370 ranked
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- All contractors in Merrimack