63/100CR Score
Ranked #1 because of its Google rating and review volume: 4.9★ from 156 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in Dover, NH (2026)
30 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Dover: Seacoast Sewer & Drain, Inc., CR Score 63/100; 4.9★ from 156 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): A-1 Septic Tank Services, posts 24/7 hours; ranked #2 of 30.
- 3
Most-reviewed: Hunts Septic Service, 165 Google reviews at 4.9★, the most of 30 ranked; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
30 Dover septic service companies are ranked here by CR Score, from ten published factors. 9 are open 24/7, 13 open Saturdays and 10 open Sundays, based on posted hours. The median Google rating is 4.9★ across 30 rated businesses.
Top 10 septic service companies in Dover at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Seacoast Sewer & Drain, Inc. | 63 | 4.9★ (156) | Eliot, 7 mi away | 24/7 | Overall |
| 2 | A-1 Septic Tank Services | 60 | 4.7★ (44) | Sanford, 15 mi away | 24/7 | Emergencies |
| 3 | Hunts Septic Service | 60 | 4.9★ (165) | Rochester, 12 mi away | — | Most reviews |
| 4 | LaPierre Septic | 60 | 4.6★ (134) | Rochester, 15 mi away | — | — |
| 5 | Seacoast Septic | 60 | 5.0★ (13) | Portsmouth, 9 mi away | 24/7 | — |
| 6 | Roland's Sewer Service | 59 | 4.6★ (9) | Manchester, 8 mi away | 24/7 | — |
| 7 | Top Dog Sewer & Drain | 58 | 4.9★ (58) | Chester, 15 mi away | 24/7 | — |
| 8 | Stoney Road Septic | 57 | 5.0★ (143) | Sanford, 22 mi away | — | — |
| 9 | McKenna Septic Service | 56 | 4.8★ (30) | Barrington, 9 mi away | — | — |
| 10 | Greg's Septic Services | 56 | 5.0★ (8) | Dover | — | — |
The 30 best septic service companies in Dover, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Sanford, 15 mi away
60/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.7★ from 44 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Rochester, 12 mi away
60/100CR ScoreRanked #3 because of its Google rating and review volume: 4.9★ from 165 Google reviews, the most in Dover.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Rochester, 15 mi away
60/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.6★ from 134 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Portsmouth, 9 mi away
60/100CR ScoreRanked #5 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 Manchester, 8 mi away
59/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.6★ from 9 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Chester, 15 mi away
58/100CR ScoreRanked #7 because of its Google rating and review volume: 4.9★ from 58 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Sanford, 22 mi away
57/100CR ScoreRanked #8 because of its Google rating and trade focus: 5.0★ from 143 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Barrington, 9 mi away
56/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.8★ 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 Dover
56/100CR ScoreRanked #10 because of its Google rating and trade focus: 5.0★ from 8 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Sanford, 15 mi away
55/100CR ScoreRanked #11 because of its Google rating and trade focus: 5.0★ from 13 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Exeter, 11 mi away
55/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.8★ from 24 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Exeter, 16 mi away
55/100CR ScoreRanked #13 because of its Google rating and review volume: 5.0★ from 103 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Barnstable, 14 mi away
54/100CR ScoreRanked #14 because of its Google rating and review volume: 5.0★ from 25 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Sandown, 22 mi away
54/100CR ScoreRanked #15 because of its Google rating and review volume: 5.0★ from 51 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
#16 Sewer Surgeons
Based in Derry, 25 mi away
54/100CR ScoreRanked #16 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.
#17 Nest & Sons Inc
Based in Kennebunk, 22 mi away
53/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.8★ from 35 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Concord, 25 mi away
53/100CR ScoreRanked #18 because of its Google rating and review volume: 4.9★ from 56 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in East Concord, 21 mi away
53/100CR ScoreRanked #19 because of its Google rating and trade focus: 4.6★ 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 Dover
53/100CR ScoreRanked #20 because of its Google rating and review volume: 4.0★ from 12 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Portsmouth, 13 mi away
53/100CR ScoreRanked #21 because of its Google rating and trade focus: 4.6★ from 11 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Chester, 14 mi away
52/100CR ScoreRanked #22 because of its Google rating and review volume: 4.9★ from 58 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Lebanon, 17 mi away
49/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.0★ from 4 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#24 A Sewer Services
Based in Amesbury, 24 mi away
49/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.7★ from 17 Google reviews, listed on Google as “Plumber”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Exeter, 13 mi away
49/100CR ScoreRanked #25 because of its Google rating and review volume: 4.6★ from 37 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
All 30 septic service companies
#1 to #25 are shown in full above. Here are #26 to #30, in CR Score order; each links to its profile.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Robbins Excavation | 47 | 4.6★ (9) | 12 mi |
| 27 | Construction Solutions | 44 | 5.0★ (5) | 25 mi |
| 28 | Powell Enterprises | 44 | 4.2★ (5) | 25 mi |
| 29 | Cyr Home Services, LLC | 43 | 5.0★ (4) | 21 mi |
| 30 | J.R.Gerrish & Sons, LLC | 42 | 5.0★ (4) | 24 mi |
Also serving Dover
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 |
|---|---|---|
| Abbott Bros Inc | 5.0★ (1) | In Dover |
| AR Septic Solutions & Excavation | 5.0★ (2) | 18 mi |
| Day's Excavation, LLC | 5.0★ (2) | In Dover |
| Farrell Contracting Services, LLC | 5.0★ (2) | 12 mi |
| Hayden Excavating Inc. | 5.0★ (1) | 14 mi |
| JDL Excavation | 20 mi | |
| JW Landscape Construction | 5.0★ (1) | 14 mi |
| Kerry Lapierre Septic & Site Work | 16 mi | |
| Lake Shore Construction, LLC. | 5.0★ (1) | 19 mi |
| Liberty Septic Services, LLC | 5.0★ (1) | 24 mi |
| N P Giroux Excavating LLC | 4.0★ (1) | 16 mi |
| NH Septic Services | 11 mi | |
| Olofson Landworks LLC | 17 mi | |
| Pagoda Vent Company | 11 mi | |
| Richard Genest Inc | 15 mi | |
| SERVPRO of The Seacoast | 4.8★ (180) | In Dover |
| South Road Designs | 5.0★ (1) | 23 mi |
How we ranked Dover septic service companies
We scored 30 Dover 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 Dover 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 Dover: frequently asked questions
Who is the best septic service company in Dover?
By CR Score, the highest-ranked septic service company in Dover, NH is Seacoast Sewer & Drain, Inc. with a CR Score of 63/100. It has 4.9★ from 156 Google reviews. It is open 24/7. A-1 Septic Tank Services (#2) and Hunts Septic Service (#3) follow. We ranked 30 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Dover?
ContractorsRanked ranks 30 septic service companies serving Dover, NH. 2 of them are based in Dover; the rest serve it from nearby towns. Another 17 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Dover are open 24/7?
9 ranked septic service companies in Dover post 24/7 hours. The highest-ranked are Seacoast Sewer & Drain, Inc. (#1), A-1 Septic Tank Services (#2) and Seacoast Septic (#5). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Dover work on weekends?
13 of 30 ranked septic service companies post Saturday hours and 10 post Sunday hours. The highest-ranked open Saturdays are Seacoast Sewer & Drain, Inc. (#1), A-1 Septic Tank Services (#2) and Seacoast Septic (#5). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Dover septic service companies have?
The median Google rating among 30 rated septic service companies in Dover is 4.9★, with a median of 25 reviews. Hunts Septic Service has the most, 165 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 Dover count in this ranking?
Yes, if they are within 25 mi of the Dover 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 Dover
- November 2026: CR Scores recalculated for 30 septic service companies serving Dover.
More septic service companies and Dover pages
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