60/100CR Score
Ranked #1 because of its Google rating and review volume: 4.9★ from 143 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in Monmouth, OR (2026)
23 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Monmouth: Proline Plumbing and Sewer, CR Score 60/100; 4.9★ from 143 Google reviews; open 24/7.
- 3
Best for emergencies (open 24/7): Legacy Valley LLC, posts 24/7 hours; ranked #3 of 23.
- 6
Most-reviewed: Mr. Rooter Plumbing of Newberg, 398 Google reviews at 4.8★, the most of 23 ranked; ranked #6.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
23 Monmouth septic service companies are ranked here by CR Score, from ten published factors. 9 are open 24/7, 11 open Saturdays and 10 open Sundays, based on posted hours. The median Google rating is 4.9★ across 23 rated businesses.
Top 10 septic service companies in Monmouth at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Proline Plumbing and Sewer | 60 | 4.9★ (143) | Salem, 11 mi away | 24/7 | Overall |
| 2 | A & B Septic Services Inc | 58 | 4.9★ (280) | Albany, 18 mi away | — | — |
| 3 | Legacy Valley LLC | 57 | 5.0★ (38) | Molalla, 24 mi away | 24/7 | Emergencies |
| 4 | Stahr Septic Service | 57 | 5.0★ (31) | Salem, 11 mi away | Sat | — |
| 5 | NW Sewer & drain | 56 | 4.8★ (45) | Salem, 13 mi away | 24/7 | — |
| 6 | Mr. Rooter Plumbing of Newberg | 55 | 4.8★ (398) | Newberg, 25 mi away | 24/7 | Most reviews |
| 7 | Willamette Valley Sewer and Drain LLC | 55 | 5.0★ (73) | Silverton, 24 mi away | 24/7 | — |
| 8 | Mid Valley Drain | 55 | 5.0★ (53) | Albany, 13 mi away | 24/7 | — |
| 9 | American Rooter Inc. | 54 | 5.0★ (64) | Albany, 18 mi away | 24/7 | — |
| 10 | West Coast Cipp Supply | 54 | 5.0★ (12) | Salem, 17 mi away | — | — |
The 23 best septic service companies in Monmouth, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Albany, 18 mi away
58/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.9★ from 280 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Molalla, 24 mi away
57/100CR ScoreRanked #3 because of its Google rating and trade focus: 5.0★ from 38 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Salem, 11 mi away
57/100CR 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 Salem, 13 mi away
56/100CR ScoreRanked #5 because of its Google rating and trade focus: 4.8★ from 45 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Newberg, 25 mi away
55/100CR ScoreRanked #6 because of its Google rating and review volume: 4.8★ from 398 Google reviews, the most in Monmouth.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Silverton, 24 mi away
55/100CR ScoreRanked #7 because of its Google rating and review volume: 5.0★ from 73 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Albany, 13 mi away
55/100CR ScoreRanked #8 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 Albany, 18 mi away
54/100CR ScoreRanked #9 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 Salem, 17 mi away
54/100CR ScoreRanked #10 because of its Google rating and trade focus: 5.0★ from 12 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Salem, 17 mi away
53/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.6★ from 38 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Stayton, 17 mi away
53/100CR ScoreRanked #12 because of its Google rating and trade focus: 5.0★ from 11 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Four Corners, 14 mi away
52/100CR ScoreRanked #13 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 Dallas, 16 mi away
51/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.5★ 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 Keizer, 17 mi away
51/100CR ScoreRanked #15 because of its Google rating and availability: 5.0★ from 16 Google reviews, open 24/7.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Albany, 18 mi away
51/100CR ScoreRanked #16 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 Lincoln City, 19 mi away
49/100CR ScoreRanked #17 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Albany, 18 mi away
48/100CR ScoreRanked #18 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 Silverton, 23 mi away
47/100CR ScoreRanked #19 because of its Google rating and trade focus: 4.6★ from 21 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Albany, 13 mi away
46/100CR ScoreRanked #20 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.
Based in Four Corners, 12 mi away
45/100CR ScoreRanked #21 because of its Google rating and trade focus: 4.0★ from 8 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Salem, 12 mi away
45/100CR ScoreRanked #22 because of its Google rating and trade focus: 3.3★ from 12 Google reviews, listed on Google as “Kitchen remodeler”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Albany, 17 mi away
44/100CR ScoreRanked #23 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.
Also serving Monmouth
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 |
|---|---|---|
| 503 Plumbing & Mechanical | 5 mi | |
| A. Pederson's Plumbing, Inc | 6 mi | |
| Canyon construction inc | 19 mi | |
| Carl's Septic LLC | 5.0★ (1) | 11 mi |
| Groundhog LLC | 5.0★ (1) | 14 mi |
| Hanks Septic Services | 5.0★ (1) | 5 mi |
| J.CO Excavating LLC | 5.0★ (2) | 13 mi |
| New Line Construction, Inc. | 15 mi | |
| Sep-Tech Excavation, Inc. | 5.0★ (1) | 10 mi |
How we ranked Monmouth septic service companies
We scored 23 Monmouth 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 Monmouth 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 Monmouth: frequently asked questions
Who is the best septic service company in Monmouth?
By CR Score, the highest-ranked septic service company in Monmouth, OR is Proline Plumbing and Sewer with a CR Score of 60/100. It has 4.9★ from 143 Google reviews. It is open 24/7. A & B Septic Services Inc (#2) and Legacy Valley LLC (#3) follow. We ranked 23 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Monmouth?
ContractorsRanked ranks 23 septic service companies serving Monmouth, OR. Another 9 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Monmouth are open 24/7?
9 ranked septic service companies in Monmouth post 24/7 hours. The highest-ranked are Proline Plumbing and Sewer (#1), Legacy Valley LLC (#3) and NW Sewer & drain (#5). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Monmouth work on weekends?
11 of 23 ranked septic service companies post Saturday hours and 10 post Sunday hours. The highest-ranked open Saturdays are Proline Plumbing and Sewer (#1), Legacy Valley LLC (#3) and Stahr Septic Service (#4). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Monmouth septic service companies have?
The median Google rating among 23 rated septic service companies in Monmouth is 4.9★, with a median of 21 reviews. Mr. Rooter Plumbing of Newberg has the most, 398 reviews, and ranks #6. 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 Monmouth count in this ranking?
Yes, if they are within 25 mi of the Monmouth 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 Monmouth
- November 2026: CR Scores recalculated for 23 septic service companies serving Monmouth.
More septic service companies and Monmouth pages
Septic service companies near Monmouth
- Septic service companies in Dallas, OR23 ranked
- Septic service companies in Salem, OR27 ranked
- Septic service companies in Four Corners, OR26 ranked
- Septic service companies in Keizer, OR25 ranked
- Septic service companies in Hayesville, OR27 ranked
- Septic service companies in Albany, OR20 ranked
- Septic service companies in Corvallis, OR13 ranked
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- Septic service companies in Lebanon, OR14 ranked
- Septic service companies in Woodburn, OR44 ranked
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