60/100CR Score
Ranked #1 because of its Google rating and review volume: 4.9★ from 784 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in Oak Harbor, WA (2026)
31 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Oak Harbor: CPI Plumbing, Heating & Cooling, CR Score 60/100; 4.9★ from 784 Google reviews; open 24/7.
- 3
Best for emergencies (open 24/7): Blackwater Services - Septic System Service, posts 24/7 hours; ranked #3 of 31.
- 4
Most-reviewed: CPI Plumbing & Heating, 2,955 Google reviews at 4.8★, the most of 31 ranked; ranked #4.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
31 Oak Harbor septic service companies are ranked here by CR Score, from ten published factors. 6 are open 24/7, 13 open Saturdays and 7 open Sundays, based on posted hours. The median Google rating is 4.7★ across 31 rated businesses.
Top 10 septic service companies in Oak Harbor at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | CPI Plumbing, Heating & Cooling | 60 | 4.9★ (784) | Oak Harbor | 24/7 | Overall |
| 2 | Dirty Deeds Septic | 59 | 4.9★ (312) | Oak Harbor | — | — |
| 3 | Blackwater Services - Septic System Service | 58 | 4.9★ (132) | Marysville, 23 mi away | 24/7 | Emergencies |
| 4 | CPI Plumbing & Heating | 57 | 4.8★ (2,955) | Mount Vernon, 16 mi away | 24/7 | Most reviews |
| 5 | Gabelein Brothers Septic | 56 | 4.8★ (28) | Camano, 19 mi away | 24/7 | — |
| 6 | Klein Septic Service | 55 | 4.7★ (73) | Arlington, 21 mi away | Sat · Sun · Evenings | — |
| 7 | Greenworks of Washington, LLC | 54 | 4.7★ (39) | Stanwood, 13 mi away | Sat | — |
| 8 | Whidbey Septic LLC | 54 | 4.8★ (13) | Oak Harbor | — | — |
| 9 | Septic Alert Inc | 54 | 3.0★ (4) | Oak Harbor | — | — |
| 10 | Metcalfe Septic Services | 53 | 4.1★ (27) | Oak Harbor | — | — |
The 31 best septic service companies in Oak Harbor, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Oak Harbor
59/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.9★ from 312 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Marysville, 23 mi away
58/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.9★ from 132 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Mount Vernon, 16 mi away
57/100CR ScoreRanked #4 because of its Google rating and review volume: 4.8★ from 2,955 Google reviews, the most in Oak Harbor.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Camano, 19 mi away
56/100CR ScoreRanked #5 because of its Google rating and trade focus: 4.8★ from 28 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Arlington, 21 mi away
55/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.7★ from 73 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Stanwood, 13 mi away
54/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.7★ from 39 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oak Harbor
54/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.8★ 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 Oak Harbor
54/100CR ScoreRanked #9 because of its Google rating and trade focus: 3.0★ from 4 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Oak Harbor
53/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.1★ from 27 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#11 Prime Septic LLC
Based in Arlington, 24 mi away
53/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.9★ from 78 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Camano, 21 mi away
52/100CR ScoreRanked #12 because of its Google rating and trade focus: 5.0★ 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 Arlington, 21 mi away
52/100CR ScoreRanked #13 because of its Google rating and trade focus: 5.0★ from 23 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Camano, 10 mi away
52/100CR ScoreRanked #14 because of its Google rating and trade focus: 3.9★ from 7 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Arlington, 23 mi away
52/100CR ScoreRanked #15 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.
#16 Berg Vault
Based in Mount Vernon, 16 mi away
52/100CR ScoreRanked #16 because of its Google rating and trade focus: 5.0★ from 32 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Arlington, 25 mi away
51/100CR ScoreRanked #17 because of its Google rating and trade focus: 3.7★ from 62 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Camano, 9 mi away
51/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.7★ 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 Camano, 24 mi away
51/100CR ScoreRanked #19 because of its Google rating and trade focus: 4.3★ 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 Mount Vernon, 17 mi away
51/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.5★ 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 Camano, 24 mi away
51/100CR ScoreRanked #21 because of its Google rating and trade focus: 5.0★ 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 Anacortes, 15 mi away
51/100CR ScoreRanked #22 because of its Google rating and trade focus: 4.2★ from 5 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Burlington, 14 mi away
50/100CR ScoreRanked #23 because of its Google rating and trade focus: 5.0★ from 80 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#24 Rainbow Septic
Based in Anacortes, 13 mi away
50/100CR ScoreRanked #24 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 Camano, 9 mi away
50/100CR ScoreRanked #25 because of its Google rating and trade focus: 3.5★ from 27 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
All 31 septic service companies
#1 to #25 are shown in full above. Here are #26 to #31, in CR Score order; each links to its profile.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Cuz Septic Service | 50 | 4.5★ (80) | 24 mi |
| 27 | Norsky Septic Service | 50 | 3.3★ (19) | 23 mi |
| 28 | Gudmunson Septic Inc | 49 | 2.9★ (9) | 19 mi |
| 29 | United Site Services | 48 | 2.9★ (11) | 16 mi |
| 30 | Gateway Septic Services | 47 | 4.2★ (10) | 24 mi |
| 31 | Busters American Septic Services | 46 | 3.7★ (3) | 22 mi |
Also serving Oak Harbor
12 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 |
|---|---|---|
| A1 Septic Solution | 18 mi | |
| All Island Septic and Building | 22 mi | |
| Arnold's Septic Systems | 21 mi | |
| C Johnson Construction, Inc. | 5.0★ (1) | 8 mi |
| EarthBuster | In Oak Harbor | |
| ELVROM CONSTRUCTION & EXCAVATING LLC | 5.0★ (2) | 10 mi |
| Evergreen Sanitation | 16 mi | |
| Metcalfe Septic Services | 1.0★ (1) | In Oak Harbor |
| Polymer Land Consultants | 3.5★ (2) | 9 mi |
| Port Williams North Sewer Pump | 25 mi | |
| Septic Alert | 19 mi | |
| Septic System Design | 15 mi |
How we ranked Oak Harbor septic service companies
We scored 31 Oak Harbor 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 Oak Harbor 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 Oak Harbor: frequently asked questions
Who is the best septic service company in Oak Harbor?
By CR Score, the highest-ranked septic service company in Oak Harbor, WA is CPI Plumbing, Heating & Cooling with a CR Score of 60/100. It has 4.9★ from 784 Google reviews. It is open 24/7. Dirty Deeds Septic (#2) and Blackwater Services - Septic System Service (#3) follow. We ranked 31 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Oak Harbor?
ContractorsRanked ranks 31 septic service companies serving Oak Harbor, WA. 5 of them are based in Oak Harbor; the rest serve it from nearby towns. Another 12 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Oak Harbor are open 24/7?
6 ranked septic service companies in Oak Harbor post 24/7 hours. The highest-ranked are CPI Plumbing, Heating & Cooling (#1), Blackwater Services - Septic System Service (#3) and CPI Plumbing & Heating (#4). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Oak Harbor work on weekends?
13 of 31 ranked septic service companies post Saturday hours and 7 post Sunday hours. The highest-ranked open Saturdays are CPI Plumbing, Heating & Cooling (#1), Blackwater Services - Septic System Service (#3) and CPI Plumbing & Heating (#4). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Oak Harbor septic service companies have?
The median Google rating among 31 rated septic service companies in Oak Harbor is 4.7★, with a median of 27 reviews. CPI Plumbing & Heating has the most, 2,955 reviews, and ranks #4. 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 Oak Harbor count in this ranking?
Yes, if they are within 25 mi of the Oak Harbor 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 Oak Harbor
- November 2026: CR Scores recalculated for 31 septic service companies serving Oak Harbor.
More septic service companies and Oak Harbor pages
Septic service companies near Oak Harbor
- Septic service companies in Camano, WA60 ranked
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