61/100CR Score
Ranked #1 because of its Google rating and review volume: 4.8★ from 2,955 Google reviews, the most in Mount Vernon.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in Mount Vernon, WA (2026)
32 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Mount Vernon: CPI Plumbing & Heating, CR Score 61/100; 4.8★ from 2,955 Google reviews; open 24/7.
- 3
Best for emergencies (open 24/7): Blackwater Services - Septic System Service, posts 24/7 hours; ranked #3 of 32.
- 7
Most-reviewed: CPI Plumbing, Heating & Cooling, 784 Google reviews at 4.9★, the most of 32 ranked after CPI Plumbing & Heating; ranked #7.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
32 Mount Vernon septic service companies are ranked here by CR Score, from ten published factors. 4 are open 24/7, 12 open Saturdays and 7 open Sundays, based on posted hours. The median Google rating is 4.7★ across 32 rated businesses.
Top 10 septic service companies in Mount Vernon at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | CPI Plumbing & Heating | 61 | 4.8★ (2,955) | Mount Vernon | 24/7 | Overall |
| 2 | Johnny's Septic Service Inc | 60 | 4.9★ (320) | Mount Vernon | — | — |
| 3 | Blackwater Services - Septic System Service | 58 | 4.9★ (132) | Marysville, 21 mi away | 24/7 | Emergencies |
| 4 | Septic Solutions LLC | 56 | 4.9★ (493) | Arlington, 23 mi away | Sat · Evenings | — |
| 5 | Klein Septic Service | 56 | 4.7★ (73) | Arlington, 15 mi away | Sat · Sun · Evenings | — |
| 6 | Berg Vault | 56 | 5.0★ (32) | Mount Vernon | — | — |
| 7 | CPI Plumbing, Heating & Cooling | 56 | 4.9★ (784) | Oak Harbor, 17 mi away | 24/7 | Most reviews |
| 8 | Dirty Deeds Septic | 55 | 4.9★ (312) | Oak Harbor, 17 mi away | — | — |
| 9 | Septic Solutions LLC Mount Vernon | 55 | 4.5★ (8) | Mount Vernon | Sat · Evenings | — |
| 10 | Greenworks of Washington, LLC | 54 | 4.7★ (39) | Stanwood, 13 mi away | Sat | — |
The 32 best septic service companies in Mount Vernon, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Mount Vernon
60/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.9★ from 320 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Marysville, 21 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 Arlington, 23 mi away
56/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.9★ from 493 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Arlington, 15 mi away
56/100CR ScoreRanked #5 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.
#6 Berg Vault
Based in Mount Vernon
56/100CR ScoreRanked #6 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 Oak Harbor, 17 mi away
56/100CR ScoreRanked #7 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.
Based in Oak Harbor, 17 mi away
55/100CR ScoreRanked #8 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 Mount Vernon
55/100CR ScoreRanked #9 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 Stanwood, 13 mi away
54/100CR ScoreRanked #10 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 Mount Vernon
54/100CR ScoreRanked #11 because of its Google rating and trade focus: 2.9★ from 9 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
#12 Prime Septic LLC
Based in Arlington, 21 mi away
54/100CR ScoreRanked #12 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 Arlington, 17 mi away
53/100CR 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 Arlington, 20 mi away
53/100CR ScoreRanked #14 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 Arlington, 20 mi away
53/100CR ScoreRanked #15 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 Bellingham, 22 mi away
53/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.8★ from 20 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Burlington, 6 mi away
52/100CR ScoreRanked #17 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.
Based in Sedro-Woolley, 11 mi away
52/100CR ScoreRanked #18 because of its Google rating and trade focus: 5.0★ 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 Mount Vernon
52/100CR ScoreRanked #19 because of its Google rating and trade focus: 2.9★ 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
52/100CR ScoreRanked #20 because of its Google rating and trade focus: 3.7★ from 3 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Camano, 16 mi away
51/100CR ScoreRanked #21 because of its Google rating and trade focus: 3.3★ 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 Sedro-Woolley, 7 mi away
51/100CR ScoreRanked #22 because of its Google rating and trade focus: 4.2★ from 10 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Arlington, 19 mi away
51/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.5★ from 80 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Anacortes, 14 mi away
51/100CR ScoreRanked #24 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.
#25 Rainbow Septic
Based in Anacortes, 13 mi away
50/100CR ScoreRanked #25 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.
All 32 septic service companies
#1 to #25 are shown in full above. Here are #26 to #32, in CR Score order; each links to its profile.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Absolute Septic Onsite Systems "SOS" | 50 | 4.7★ (14) | 16 mi |
| 27 | RW Kramer Enterprises, Inc. | 50 | 3.9★ (7) | 17 mi |
| 28 | Alpine Environmental Services | 50 | 4.7★ (11) | 16 mi |
| 29 | Metcalfe Septic Services | 49 | 4.1★ (27) | 16 mi |
| 30 | Envirotek Septic Solutions | 48 | 3.5★ (27) | 16 mi |
| 31 | Septic Alert Inc | 48 | 3.0★ (4) | 21 mi |
| 32 | Whidbey Septic LLC | 48 | 4.8★ (13) | 24 mi |
Also serving Mount Vernon
9 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 | In Mount Vernon | |
| C Johnson Construction, Inc. | 5.0★ (1) | 14 mi |
| Centennial Septic Service | 24 mi | |
| EarthBuster | 16 mi | |
| ELVROM CONSTRUCTION & EXCAVATING LLC | 5.0★ (2) | 12 mi |
| Evergreen Sanitation | In Mount Vernon | |
| Metcalfe Septic Services | 1.0★ (1) | 17 mi |
| Polymer Land Consultants | 3.5★ (2) | 15 mi |
| Septic System Design | 14 mi |
How we ranked Mount Vernon septic service companies
We scored 32 Mount Vernon 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 Mount Vernon 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 Mount Vernon: frequently asked questions
Who is the best septic service company in Mount Vernon?
By CR Score, the highest-ranked septic service company in Mount Vernon, WA is CPI Plumbing & Heating with a CR Score of 61/100. It has 4.8★ from 2,955 Google reviews. It is open 24/7. Johnny's Septic Service Inc (#2) and Blackwater Services - Septic System Service (#3) follow. We ranked 32 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Mount Vernon?
ContractorsRanked ranks 32 septic service companies serving Mount Vernon, WA. 7 of them are based in Mount Vernon; the rest serve it from nearby towns. Another 9 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Mount Vernon are open 24/7?
4 ranked septic service companies in Mount Vernon post 24/7 hours. The highest-ranked are CPI Plumbing & Heating (#1), Blackwater Services - Septic System Service (#3) and CPI Plumbing, Heating & Cooling (#7). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Mount Vernon work on weekends?
12 of 32 ranked septic service companies post Saturday hours and 7 post Sunday hours. The highest-ranked open Saturdays are CPI Plumbing & Heating (#1), Blackwater Services - Septic System Service (#3) and Septic Solutions LLC (#4). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Mount Vernon septic service companies have?
The median Google rating among 32 rated septic service companies in Mount Vernon is 4.7★, with a median of 25 reviews. CPI Plumbing & Heating has the most, 2,955 reviews, and ranks #1. 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 Mount Vernon count in this ranking?
Yes, if they are within 25 mi of the Mount Vernon 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 Mount Vernon
- November 2026: CR Scores recalculated for 32 septic service companies serving Mount Vernon.
More septic service companies and Mount Vernon pages
Septic service companies near Mount Vernon
- Septic service companies in Sedro-Woolley, WA33 ranked
- Septic service companies in Anacortes, WA24 ranked
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