62/100CR Score
Ranked #1 because of its Google rating and trade focus: 5.0★ from 593 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 Pasco, WA (2026)
17 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Pasco: Ray's Twilight Septic Service, CR Score 62/100; 5.0★ from 593 Google reviews.
- 2
Best for emergencies (open 24/7): Express 24 Hr Plumbing & Drain, LLC, posts 24/7 hours; ranked #2 of 17.
- 2
Most-reviewed: Express 24 Hr Plumbing & Drain, LLC, 1,150 Google reviews at 4.9★, the most of 17 ranked; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
17 Pasco septic service companies are ranked here by CR Score, from ten published factors. 4 are open 24/7, 8 open Saturdays and 7 open Sundays, based on posted hours. The median Google rating is 4.8★ across 17 rated businesses.
Most of this list also appears on the Septic service companies in Kennewick ranking. See Septic service companies in Kennewick
Top 10 septic service companies in Pasco at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Ray's Twilight Septic Service | 62 | 5.0★ (593) | Pasco | — | Overall |
| 2 | Express 24 Hr Plumbing & Drain, LLC | 61 | 4.9★ (1,150) | Kennewick, 5 mi away | 24/7 | Emergencies, Most reviews |
| 3 | Mr. Rooter Plumbing of Tri-Cities | 60 | 4.7★ (744) | Pasco | 24/7 | — |
| 4 | Bison Septic | 59 | 4.8★ (87) | Kennewick, 8 mi away | Sat · Sun | — |
| 5 | Greg's Septic Service | 59 | 4.8★ (44) | Kennewick, 4 mi away | Sat · Sun | — |
| 6 | Reliable Rooter | 57 | 4.6★ (161) | Pasco | 24/7 | — |
| 7 | Ace portable toilets & Septic Tank Pumping | 56 | 4.8★ (27) | Pasco | — | — |
| 8 | Doctor Dan Septic Specialist | 54 | 5.0★ (4) | Richland, 4 mi away | — | — |
| 9 | Warthog Septic | 53 | 5.0★ (5) | Pasco | Sat · Sun | — |
| 10 | Shadow Mountain Septic and Plumbing LLC | 52 | 4.8★ (16) | West Richland, 19 mi away | 24/7 | — |
The 17 best septic service companies in Pasco, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Kennewick, 5 mi away
61/100CR ScoreRanked #2 because of its Google rating and review volume: 4.9★ from 1,150 Google reviews, the most in Pasco.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pasco
60/100CR ScoreRanked #3 because of its Google rating and review volume: 4.7★ from 744 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
#4 Bison Septic
Based in Kennewick, 8 mi away
59/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.8★ from 87 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Kennewick, 4 mi away
59/100CR ScoreRanked #5 because of its Google rating and trade focus: 4.8★ from 44 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pasco
57/100CR ScoreRanked #6 because of its Google rating and review volume: 4.6★ from 161 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pasco
56/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.8★ from 27 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Richland, 4 mi away
54/100CR ScoreRanked #8 because of its Google rating and trade focus: 5.0★ 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 Pasco
53/100CR ScoreRanked #9 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in West Richland, 19 mi away
52/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.8★ from 16 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#11 Sewer Pros
Based in Kennewick, 5 mi away
52/100CR ScoreRanked #11 because of its Google rating and trade focus: 5.0★ from 10 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Richland, 12 mi away
49/100CR ScoreRanked #12 because of its Google rating and review volume: 4.9★ from 66 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Kennewick, 4 mi away
48/100CR ScoreRanked #13 because of its Google rating and review volume: 4.3★ from 37 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
#14 Rada Inc
Based in Pasco
47/100CR ScoreRanked #14 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Concrete contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Richland, 6 mi away
47/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.8★ from 16 Google reviews, listed on Google as “Concrete contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pasco
47/100CR ScoreRanked #16 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Asphalt contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Kennewick, 8 mi away
46/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.5★ from 14 Google reviews, listed on Google as “Construction company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
How we ranked Pasco septic service companies
We scored 17 Pasco 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 Pasco 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 Pasco: frequently asked questions
Who is the best septic service company in Pasco?
By CR Score, the highest-ranked septic service company in Pasco, WA is Ray's Twilight Septic Service with a CR Score of 62/100. It has 5.0★ from 593 Google reviews. Express 24 Hr Plumbing & Drain, LLC (#2) and Mr. Rooter Plumbing of Tri-Cities (#3) follow. We ranked 17 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Pasco?
ContractorsRanked ranks 17 septic service companies serving Pasco, WA. 7 of them are based in Pasco; the rest serve it from nearby towns. Counts are as of November 2026.
Which septic service companies in Pasco are open 24/7?
4 ranked septic service companies in Pasco post 24/7 hours. The highest-ranked are Express 24 Hr Plumbing & Drain, LLC (#2), Mr. Rooter Plumbing of Tri-Cities (#3) and Reliable Rooter (#6). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Pasco work on weekends?
8 of 17 ranked septic service companies post Saturday hours and 7 post Sunday hours. The highest-ranked open Saturdays are Express 24 Hr Plumbing & Drain, LLC (#2), Mr. Rooter Plumbing of Tri-Cities (#3) and Bison Septic (#4). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Pasco septic service companies have?
The median Google rating among 17 rated septic service companies in Pasco is 4.8★, with a median of 27 reviews. Express 24 Hr Plumbing & Drain, LLC has the most, 1,150 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 Pasco count in this ranking?
Yes, if they are within 25 mi of the Pasco 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 Pasco
- November 2026: CR Scores recalculated for 17 septic service companies serving Pasco.
More septic service companies and Pasco pages
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