81 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Londonderry: Carl's Septic Systems and Services in New Hampshire, CR Score 60/100; 4.8★ from 118 Google reviews; open 24/7.
Best for emergencies (open 24/7): Sewer Surgeons, posts 24/7 hours; ranked #2 of 81.
Most-reviewed: New Era Plumbing & HVAC, 1,003 Google reviews at 4.9★, the most of 81 ranked; ranked #19.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
81 Londonderry septic service companies are ranked here by CR Score, from ten published factors. 19 are open 24/7, 32 open Saturdays and 22 open Sundays, based on posted hours. The median Google rating is 4.9★ across 81 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Carl's Septic Systems and Services in New Hampshire | 60 | 4.8★ (118) | Manchester, 14 mi away | 24/7 | Overall |
| 2 | Sewer Surgeons | 60 | 4.8★ (295) | East Concord, 20 mi away | 24/7 | Emergencies |
| 3 | LaFrance Septic Services | 60 | 4.9★ (96) | Salem, 9 mi away | Sat · Sun | — |
| 4 | Hamm Septic Services | 59 | 4.9★ (196) | Hudson, 3 mi away | — | — |
| 5 | East Coast Pipe Service | 59 | 5.0★ (26) | East Concord, 5 mi away | Sat · Sun | — |
| 6 | Derry Septic Service | 58 | 5.0★ (67) | Londonderry | — | — |
| 7 | Granite State Sewer & Drain Cleaning | 57 | 4.9★ (380) | Hudson, 3 mi away | — | — |
| 8 | Kent Septic LLC | 57 | 4.8★ (287) | Manchester, 14 mi away | — | — |
| 9 | Chongris Engineering LLC | 57 | 5.0★ (16) | Andover, 17 mi away | 24/7 | — |
| 10 | Bateson Enterprises Inc | 56 | 4.6★ (27) | Andover, 18 mi away | 24/7 | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Ranked #1 in Londonderry
Based in Manchester, 14 mi away
Ranked #1 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 East Concord, 20 mi away
Ranked #2 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.
Based in Salem, 9 mi away
Ranked #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, 3 mi away
Ranked #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, 5 mi away
Ranked #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 Londonderry
Ranked #6 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 Hudson, 3 mi away
Ranked #7 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 Manchester, 14 mi away
Ranked #8 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 Andover, 17 mi away
Ranked #9 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, 18 mi away
Ranked #10 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.
Based in Concord, 20 mi away
Ranked #11 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 Concord, 20 mi away
Ranked #12 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 Bedford, 9 mi away
Ranked #13 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 Leominster, 23 mi away
Ranked #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 Derry, 12 mi away
Ranked #15 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 Nashua, 7 mi away
Ranked #16 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.
Based in Hampstead, 11 mi away
Ranked #17 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.
Based in Windham, 7 mi away
Ranked #18 because of its Google rating and trade focus: 4.9★ from 36 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Dracut, 14 mi away
Ranked #19 because of its Google rating and review volume: 4.9★ from 1,003 Google reviews, the most in Londonderry.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Manchester, 3 mi away
Ranked #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 Windham, 6 mi away
Ranked #21 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 Plaistow, 16 mi away
Ranked #22 because of its Google rating and trade focus: 4.8★ from 52 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Fitchburg, 22 mi away
Ranked #23 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 Lawrence, 16 mi away
Ranked #24 because of its Google rating and review volume: 5.0★ from 118 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Westford, 17 mi away
Ranked #25 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.
#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 81 ranked septic service companies here; the rest are on their profiles.
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) | 7 mi |
| Agritec Building & Excavating Contractors | 4.0★ (1) | 25 mi |
| Al's Septic & Excavation | 3.0★ (2) | 3 mi |
| All-Clear Septic Services | 1.0★ (1) | 25 mi |
| Beaver Brook Planning and Design, LLC | 5.0★ (1) | 25 mi |
| Borough Sewer Services | 4.0★ (1) | 15 mi |
| DoneRight Septic Service | 4 mi | |
| Farrell Contracting Services, LLC | 5.0★ (2) | 22 mi |
| Land Engineering & Envrmntl | 5.0★ (2) | 14 mi |
| Liberty Septic Services, LLC | 5.0★ (1) | 14 mi |
| N P Giroux Excavating LLC | 4.0★ (1) | 20 mi |
| New England Lawn Irrigation | 4.8★ (14) | In Londonderry |
| QUIRK Real Estate Sales, Development and Construction | 3.0★ (2) | 11 mi |
| Sandford Surveying and Engineering, Inc. | 5.0★ (1) | 14 mi |
| Sewer Works | 5.0★ (2) | 9 mi |
| Slate Corporation | 5.0★ (1) | 10 mi |
| South Road Designs | 5.0★ (1) | 20 mi |
| Stewart Septic Services | 3.0★ (2) | 9 mi |
| Title 5 Inspection | 5.0★ (1) | 9 mi |
| Wilson Septic Systems & Paving | 5.0★ (1) | 25 mi |
We scored 81 Londonderry 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 Londonderry 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 |