66/100CR Score
Ranked #1 because of its Google rating and trade focus: 5.0★ from 98 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in Los Osos, CA (2026)
11 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Los Osos: North County Septic Service Inc., CR Score 66/100; 5.0★ from 98 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Roto-Rooter Plumbing & Water Cleanup, posts 24/7 hours; ranked #2 of 11.
- 2
Most-reviewed: Roto-Rooter Plumbing & Water Cleanup, 110 Google reviews at 4.6★, the most of 11 ranked; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
11 Los Osos septic service companies are ranked here by CR Score, from ten published factors. 4 are open 24/7, 5 open Saturdays and 4 open Sundays, based on posted hours. The median Google rating is 4.8★ across 11 rated businesses.
Top 10 septic service companies in Los Osos at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | North County Septic Service Inc. | 66 | 5.0★ (98) | Paso Robles, 7 mi away | 24/7 | Overall |
| 2 | Roto-Rooter Plumbing & Water Cleanup | 58 | 4.6★ (110) | San Luis Obispo, 10 mi away | 24/7 | Emergencies, Most reviews |
| 3 | On Site Plumbing & Septic | 57 | 4.8★ (19) | Atascadero, 4 mi away | Evenings | — |
| 4 | Al's Septic Pumping Services | 56 | 5.0★ (7) | Los Osos | — | — |
| 5 | Ingram & Greene Sanitation | 55 | 5.0★ (24) | Atascadero, 15 mi away | — | — |
| 6 | Sewer Oscopy West LLC | 55 | 5.0★ (55) | Atascadero, 18 mi away | Sat | — |
| 7 | Precision Septic, Inc. | 53 | 4.7★ (15) | Atascadero, 15 mi away | — | — |
| 8 | Drain Doctors Plumbing | 52 | 4.8★ (52) | San Luis Obispo, 10 mi away | — | — |
| 9 | Roto-Rooter Plumbing & Water Cleanup | 50 | 4.1★ (22) | San Luis Obispo, 21 mi away | 24/7 | — |
| 10 | Essential Pro Plumbing | 48 | 5.0★ (4) | Nipomo, 20 mi away | 24/7 | — |
The 11 best septic service companies in Los Osos, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in San Luis Obispo, 10 mi away
58/100CR ScoreRanked #2 because of its Google rating and review volume: 4.6★ from 110 Google reviews, the most in Los Osos.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Atascadero, 4 mi away
57/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.8★ 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 Los Osos
56/100CR ScoreRanked #4 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Atascadero, 15 mi away
55/100CR ScoreRanked #5 because of its Google rating and trade focus: 5.0★ 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 Atascadero, 18 mi away
55/100CR ScoreRanked #6 because of its Google rating and review volume: 5.0★ from 55 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Atascadero, 15 mi away
53/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.7★ from 15 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Luis Obispo, 10 mi away
52/100CR ScoreRanked #8 because of its Google rating and review volume: 4.8★ from 52 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Luis Obispo, 21 mi away
50/100CR ScoreRanked #9 because of its Google rating and review volume: 4.1★ from 22 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Nipomo, 20 mi away
48/100CR ScoreRanked #10 because of its Google rating and availability: 5.0★ from 4 Google reviews, open 24/7.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Paso Robles, 24 mi away
45/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.7★ from 3 Google reviews, listed on Google as “Plumber”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Also serving Los Osos
10 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 |
|---|---|---|
| Al's Septic Pumping Services | 5.0★ (1) | In Los Osos |
| Clay's Septic & Jetting Inc | In Los Osos | |
| Clay's Septic Services | 5.0★ (2) | 10 mi |
| Clay's Septic Services | 3.0★ (2) | 15 mi |
| Royal Flush Sewer and Drain Cleaning | 5.0★ (2) | In Los Osos |
| Sims Septic Pumping and Repair | 5.0★ (1) | 23 mi |
| Story's Construction | In Los Osos | |
| Valley Septic | 1.0★ (1) | 9 mi |
| Valley Septic | 4.0★ (1) | 15 mi |
| Viola Construction Inc | 3.0★ (2) | 19 mi |
How we ranked Los Osos septic service companies
We scored 11 Los Osos 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 Los Osos 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 Los Osos: frequently asked questions
Who is the best septic service company in Los Osos?
By CR Score, the highest-ranked septic service company in Los Osos, CA is North County Septic Service Inc. with a CR Score of 66/100. It has 5.0★ from 98 Google reviews. It is open 24/7. Roto-Rooter Plumbing & Water Cleanup (#2) and On Site Plumbing & Septic (#3) follow. We ranked 11 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Los Osos?
ContractorsRanked ranks 11 septic service companies serving Los Osos, CA. 1 of them is based in Los Osos; the rest serve it from nearby towns. Another 10 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Los Osos are open 24/7?
4 ranked septic service companies in Los Osos post 24/7 hours. The highest-ranked are North County Septic Service Inc. (#1), Roto-Rooter Plumbing & Water Cleanup (#2) and Roto-Rooter Plumbing & Water Cleanup (#9). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Los Osos work on weekends?
5 of 11 ranked septic service companies post Saturday hours and 4 post Sunday hours. The highest-ranked open Saturdays are North County Septic Service Inc. (#1), Roto-Rooter Plumbing & Water Cleanup (#2) and Sewer Oscopy West LLC (#6). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Los Osos septic service companies have?
The median Google rating among 11 rated septic service companies in Los Osos is 4.8★, with a median of 22 reviews. Roto-Rooter Plumbing & Water Cleanup has the most, 110 reviews, and ranks #2. 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 Los Osos count in this ranking?
Yes, if they are within 25 mi of the Los Osos 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 Los Osos
- November 2026: CR Scores recalculated for 11 septic service companies serving Los Osos.
More septic service companies and Los Osos pages
Septic service companies near Los Osos
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