61/100CR Score
Ranked #1 because of its Google rating and review volume: 4.9★ from 280 Google reviews, the most in Corvallis.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in Corvallis, OR (2026)
13 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Corvallis: A & B Septic Services Inc, CR Score 61/100; 4.9★ from 280 Google reviews.
- 2
Best for emergencies (open 24/7): American Rooter Inc., posts 24/7 hours; ranked #2 of 13.
- 2
Most-reviewed: American Rooter Inc., 64 Google reviews at 5.0★, the most of 13 ranked after A & B Septic Services Inc; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
13 Corvallis septic service companies are ranked here by CR Score, from ten published factors. 2 are open 24/7, 4 open Saturdays and 3 open Sundays, based on posted hours. The median Google rating is 4.8★ across 13 rated businesses.
Top 10 septic service companies in Corvallis at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | A & B Septic Services Inc | 61 | 4.9★ (280) | Albany, 8 mi away | — | Overall |
| 2 | American Rooter Inc. | 57 | 5.0★ (64) | Albany, 8 mi away | 24/7 | Emergencies, Most reviews |
| 3 | Mid Valley Drain | 55 | 5.0★ (53) | Albany, 14 mi away | 24/7 | — |
| 4 | Stahr Septic Service | 54 | 5.0★ (31) | Salem, 23 mi away | Sat | — |
| 5 | Valley Spetic Services | 53 | 4.5★ (12) | Albany, 8 mi away | — | — |
| 6 | LinnCo Excavation & Septic | 51 | 4.8★ (19) | Albany, 7 mi away | — | — |
| 7 | Affordable Septic Systems | 51 | 4.0★ (24) | Lebanon, 19 mi away | — | — |
| 8 | J.A. Holland Construction LLC | 50 | 4.8★ (37) | Four Corners, 23 mi away | Sat · Sun | — |
| 9 | Pacific Coast Septic | 50 | 4.0★ (3) | Lebanon, 21 mi away | — | — |
| 10 | Ray's Septic Tank Services | 48 | 4.6★ (32) | Albany, 23 mi away | — | — |
The 13 best septic service companies in Corvallis, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Albany, 8 mi away
57/100CR ScoreRanked #2 because of its Google rating and review volume: 5.0★ from 64 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Albany, 14 mi away
55/100CR ScoreRanked #3 because of its Google rating and review volume: 5.0★ from 53 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Salem, 23 mi away
54/100CR ScoreRanked #4 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 Albany, 8 mi away
53/100CR ScoreRanked #5 because of its Google rating and trade focus: 4.5★ from 12 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Albany, 7 mi away
51/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.8★ from 19 Google reviews, listed on Google as “Excavating contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Lebanon, 19 mi away
51/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.0★ 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 Four Corners, 23 mi away
50/100CR ScoreRanked #8 because of its Google rating and review volume: 4.8★ from 37 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Lebanon, 21 mi away
50/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.0★ from 3 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Albany, 23 mi away
48/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.6★ from 32 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Albany, 8 mi away
47/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.1★ from 13 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Albany, 17 mi away
45/100CR ScoreRanked #12 because of its Google rating and trade focus: 5.0★ from 9 Google reviews, listed on Google as “Excavating contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#13 DIME Precision
Based in Lebanon, 21 mi away
43/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.3★ from 6 Google reviews, listed on Google as “Roofing contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Also serving Corvallis
7 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 |
|---|---|---|
| 503 Plumbing & Mechanical | 24 mi | |
| A. Pederson's Plumbing, Inc | 22 mi | |
| Arrow Septic Services | 24 mi | |
| Carl's Septic LLC | 5.0★ (1) | 25 mi |
| Clearline Plumbing & Drain Of Corvallis | 5.0★ (9) | In Corvallis |
| Groundhog LLC | 5.0★ (1) | In Corvallis |
| Hanks Septic Services | 5.0★ (1) | 21 mi |
How we ranked Corvallis septic service companies
We scored 13 Corvallis 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 Corvallis 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 Corvallis: frequently asked questions
Who is the best septic service company in Corvallis?
By CR Score, the highest-ranked septic service company in Corvallis, OR is A & B Septic Services Inc with a CR Score of 61/100. It has 4.9★ from 280 Google reviews. American Rooter Inc. (#2) and Mid Valley Drain (#3) follow. We ranked 13 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Corvallis?
ContractorsRanked ranks 13 septic service companies serving Corvallis, OR. Another 7 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Corvallis are open 24/7?
2 ranked septic service companies in Corvallis post 24/7 hours. The highest-ranked are American Rooter Inc. (#2) and Mid Valley Drain (#3). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Corvallis work on weekends?
4 of 13 ranked septic service companies post Saturday hours and 3 post Sunday hours. The highest-ranked open Saturdays are American Rooter Inc. (#2), Mid Valley Drain (#3) and Stahr Septic Service (#4). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Corvallis septic service companies have?
The median Google rating among 13 rated septic service companies in Corvallis is 4.8★, with a median of 24 reviews. A & B Septic Services Inc has the most, 280 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 Corvallis count in this ranking?
Yes, if they are within 25 mi of the Corvallis 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 Corvallis
- November 2026: CR Scores recalculated for 13 septic service companies serving Corvallis.
More septic service companies and Corvallis pages
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