56/100CR Score
Ranked #1 because of its Google rating and review volume: 5.0★ from 2,219 Google reviews, the most in Washington.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in Washington, MO (2026)
18 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Washington: Superior Service, CR Score 56/100; 5.0★ from 2,219 Google reviews; open 7 days a week.
- 2
Best for emergencies (open 24/7): Shamrock Sewer & Drain, posts 24/7 hours; ranked #2 of 18.
- 4
Most-reviewed: Superior Service, 1,766 Google reviews at 4.9★, the most of 18 ranked after Superior Service; ranked #4.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
18 Washington septic service companies are ranked here by CR Score, from ten published factors. 5 are open 24/7, 10 open Saturdays and 7 open Sundays, based on posted hours. The median Google rating is 4.8★ across 18 rated businesses.
Top 10 septic service companies in Washington at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Superior Service | 56 | 5.0★ (2,219) | Dardenne Prairie, 18 mi away | Sat · Sun · Evenings | Overall |
| 2 | Shamrock Sewer & Drain | 56 | 4.8★ (304) | Pacific, 18 mi away | 24/7 | Emergencies |
| 3 | Septic Services, Inc. | 55 | 4.8★ (99) | Union, 9 mi away | — | — |
| 4 | Superior Service | 54 | 4.9★ (1,766) | Chesterfield, 22 mi away | Sat · Sun · Evenings | Most reviews |
| 5 | B & G Sewer & Septic LLC | 54 | 4.5★ (13) | Washington | — | — |
| 6 | Integrity Septic And Sewer | 54 | 5.0★ (14) | Pacific, 13 mi away | — | — |
| 7 | Signature Plumbing & Drain Cleaning LLC | 54 | 4.8★ (104) | Union, 10 mi away | 24/7 | — |
| 8 | Dc septic & drain | 54 | 4.7★ (15) | Troy, 24 mi away | 24/7 | — |
| 9 | Warrior Sewer and Drain | 53 | 4.8★ (459) | Chesterfield, 22 mi away | Sat · Evenings | — |
| 10 | A&M Septic and Excavating, LLC | 53 | 3.1★ (18) | O'Fallon, 19 mi away | 24/7 | — |
The 18 best septic service companies in Washington, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Pacific, 18 mi away
56/100CR ScoreRanked #2 because of its Google rating and review volume: 4.8★ from 304 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Union, 9 mi away
55/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.8★ from 99 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Chesterfield, 22 mi away
54/100CR ScoreRanked #4 because of its Google rating and review volume: 4.9★ from 1,766 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Washington
54/100CR ScoreRanked #5 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 Pacific, 13 mi away
54/100CR ScoreRanked #6 because of its Google rating and trade focus: 5.0★ from 14 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Union, 10 mi away
54/100CR ScoreRanked #7 because of its Google rating and review volume: 4.8★ from 104 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Troy, 24 mi away
54/100CR ScoreRanked #8 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 Chesterfield, 22 mi away
53/100CR ScoreRanked #9 because of its Google rating and review volume: 4.8★ from 459 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in O'Fallon, 19 mi away
53/100CR ScoreRanked #10 because of its Google rating and trade focus: 3.1★ from 18 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Peters, 25 mi away
52/100CR ScoreRanked #11 because of its Google rating and review volume: 4.8★ from 356 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
#12 The Sewer Pros
Based in Chesterfield, 21 mi away
52/100CR ScoreRanked #12 because of its Google rating and review volume: 4.9★ from 594 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Wildwood, 22 mi away
51/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.8★ from 61 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Wildwood, 24 mi away
51/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.2★ from 56 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Eureka, 21 mi away
49/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.9★ from 79 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Peters, 14 mi away
49/100CR ScoreRanked #16 because of its Google rating and review volume: 4.8★ from 59 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Warrenton, 19 mi away
44/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.4★ from 28 Google reviews, listed on Google as “Contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Bowling Green, 23 mi away
42/100CR ScoreRanked #18 because of its Google rating and trade focus: 3.0★ from 6 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Also serving Washington
3 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 | Distance |
|---|---|
| Alpha Sewer N Drain | 20 mi |
| O'Fallon Sewer & Plumbing Repair Service | 18 mi |
| Septic Tank Parts.com | 9 mi |
How we ranked Washington septic service companies
We scored 18 Washington 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 Washington 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 Washington: frequently asked questions
Who is the best septic service company in Washington?
By CR Score, the highest-ranked septic service company in Washington, MO is Superior Service with a CR Score of 56/100. It has 5.0★ from 2,219 Google reviews. It is open 7 days a week. Shamrock Sewer & Drain (#2) and Septic Services, Inc. (#3) follow. We ranked 18 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Washington?
ContractorsRanked ranks 18 septic service companies serving Washington, MO. 1 of them is based in Washington; the rest serve it from nearby towns. Another 3 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Washington are open 24/7?
5 ranked septic service companies in Washington post 24/7 hours. The highest-ranked are Shamrock Sewer & Drain (#2), Signature Plumbing & Drain Cleaning LLC (#7) and Dc septic & drain (#8). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Washington work on weekends?
10 of 18 ranked septic service companies post Saturday hours and 7 post Sunday hours. The highest-ranked open Saturdays are Superior Service (#1), Shamrock Sewer & Drain (#2) and Superior Service (#4). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Washington septic service companies have?
The median Google rating among 18 rated septic service companies in Washington is 4.8★, with a median of 70 reviews. Superior Service has the most, 2,219 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 Washington count in this ranking?
Yes, if they are within 25 mi of the Washington 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 Washington
- November 2026: CR Scores recalculated for 18 septic service companies serving Washington.
More septic service companies and Washington pages
Septic service companies near Washington
- Septic service companies in Union, MO12 ranked
- Septic service companies in Wildwood, MO58 ranked
- Septic service companies in Wentzville, MO24 ranked
- Septic service companies in Lake Saint Louis, MO31 ranked
- Septic service companies in Eureka, MO58 ranked
- Septic service companies in Dardenne Prairie, MO40 ranked
- Septic service companies in O'Fallon, MO38 ranked
- Septic service companies in Chesterfield, MO63 ranked
- Septic service companies in Ballwin, MO62 ranked
- Septic service companies in Saint Peters, MO47 ranked
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