59/100CR Score
Ranked #1 because of its Google rating and trade focus: 5.0★ from 130 Google reviews, listed on Google as “Plumber”.
Best Septic Service Companies in Diamond Bar, CA (2026)
118 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Diamond Bar: EZ Sewers Rooter and Plumbing, CR Score 59/100; 5.0★ from 130 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): I Love Sewers Rooter And Plumbing Sewer Specialties Inc, posts 24/7 hours; ranked #2 of 118.
- 3
Most-reviewed: Option One Plumbing, 3,017 Google reviews at 4.8★, the most of 118 ranked; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
118 Diamond Bar septic service companies are ranked here by CR Score, from ten published factors. 67 are open 24/7, 95 open Saturdays and 79 open Sundays, based on posted hours. The median Google rating is 4.9★ across 118 rated businesses.
Top 10 septic service companies in Diamond Bar at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | EZ Sewers Rooter and Plumbing | 59 | 5.0★ (130) | Avocado Heights, 2 mi away | 24/7 | Overall |
| 2 | I Love Sewers Rooter And Plumbing Sewer Specialties Inc | 58 | 4.9★ (200) | Hacienda Heights, 9 mi away | 24/7 | Emergencies |
| 3 | Option One Plumbing | 58 | 4.8★ (3,017) | Rancho Cucamonga, 15 mi away | 24/7 | Most reviews |
| 4 | Sewer Kingz Plumbing & Rooter | 58 | 5.0★ (33) | Monrovia, 15 mi away | 24/7 | — |
| 5 | Jetters 'N' Drains Sewer & Pipe Lining Experts | 57 | 5.0★ (205) | Anaheim, 13 mi away | 24/7 | — |
| 6 | SWE Sewer Solutions Construction & Engineering | 57 | 4.9★ (120) | Glendora, 8 mi away | 24/7 | — |
| 7 | Urgent Septic Solutions | 57 | 5.0★ (80) | Los Angeles, 21 mi away | 24/7 | — |
| 8 | Western Rooter & Plumbing | 57 | 4.9★ (1,562) | Arcadia, 15 mi away | 24/7 | — |
| 9 | Countywide Septic Pumping LLC | 57 | 4.5★ (120) | Jurupa Valley, 17 mi away | 24/7 | — |
| 10 | Quality Pumping Services Inc. | 57 | 5.0★ (11) | Ontario, 9 mi away | 24/7 | — |
The 118 best septic service companies in Diamond Bar, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Based in Hacienda Heights, 9 mi away
58/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.9★ from 200 Google reviews, listed on Google as “Plumber”.
Based in Rancho Cucamonga, 15 mi away
58/100CR ScoreRanked #3 because of its Google rating and review volume: 4.8★ from 3,017 Google reviews, the most in Diamond Bar.
Based in Monrovia, 15 mi away
58/100CR ScoreRanked #4 because of its Google rating and trade focus: 5.0★ from 33 Google reviews, listed on Google as “Septic system service”.
Based in Anaheim, 13 mi away
57/100CR ScoreRanked #5 because of its Google rating and trade focus: 5.0★ from 205 Google reviews, listed on Google as “Plumber”.
Based in Glendora, 8 mi away
57/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.9★ from 120 Google reviews, listed on Google as “Plumber”.
Based in Los Angeles, 21 mi away
57/100CR ScoreRanked #7 because of its Google rating and trade focus: 5.0★ from 80 Google reviews, listed on Google as “Septic system service”.
Based in Arcadia, 15 mi away
57/100CR ScoreRanked #8 because of its Google rating and review volume: 4.9★ from 1,562 Google reviews.
Based in Jurupa Valley, 17 mi away
57/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.5★ from 120 Google reviews, listed on Google as “Septic system service”.
Based in Ontario, 9 mi away
57/100CR ScoreRanked #10 because of its Google rating and trade focus: 5.0★ from 11 Google reviews, listed on Google as “Septic system service”.
Based in Irvine, 23 mi away
57/100CR ScoreRanked #11 because of its Google rating and trade focus: 5.0★ from 80 Google reviews, listed on Google as “Septic system service”.
Based in Whittier, 14 mi away
57/100CR ScoreRanked #12 because of its Google rating and review volume: 4.8★ from 295 Google reviews.
Based in Rancho Cucamonga, 12 mi away
57/100CR ScoreRanked #13 because of its Google rating and review volume: 4.9★ from 756 Google reviews.
#14 Reliable Septic
Based in Anaheim, 10 mi away
57/100CR ScoreRanked #14 because of its Google rating and trade focus: 5.0★ from 9 Google reviews, listed on Google as “Septic system service”.
Based in Anaheim, 13 mi away
56/100CR ScoreRanked #15 because of its Google rating and review volume: 4.9★ from 560 Google reviews.
Based in Pomona, 4 mi away
56/100CR ScoreRanked #16 because of its Google rating and review volume: 4.9★ from 131 Google reviews.
Based in Fontana, 19 mi away
56/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.6★ from 45 Google reviews, listed on Google as “Septic system service”.
Based in Glendora, 8 mi away
56/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.8★ from 51 Google reviews, listed on Google as “Plumber”.
Based in La Verne, 5 mi away
55/100CR ScoreRanked #19 because of its Google rating and review volume: 4.8★ from 132 Google reviews.
Based in La Habra, 11 mi away
55/100CR ScoreRanked #20 because of its Google rating and review volume: 4.9★ from 661 Google reviews.
Based in Rancho Cucamonga, 15 mi away
55/100CR ScoreRanked #21 because of its Google rating and review volume: 4.9★ from 354 Google reviews.
Based in Long Beach, 23 mi away
55/100CR ScoreRanked #22 because of its Google rating and review volume: 4.9★ from 1,140 Google reviews.
Based in Upland, 9 mi away
55/100CR ScoreRanked #23 because of its Google rating and review volume: 4.9★ from 147 Google reviews.
Based in Monrovia, 14 mi away
55/100CR ScoreRanked #24 because of its Google rating and review volume: 4.9★ from 266 Google reviews.
Based in Rancho Cucamonga, 14 mi away
55/100CR ScoreRanked #25 because of its Google rating and review volume: 5.0★ from 219 Google reviews.
Septic service companies ranked #26 to #50
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 118 ranked septic service companies here; the rest are on their profiles.
Also serving Diamond Bar
20 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 |
|---|---|---|
| Abel Real Plumbing | 5.0★ (1) | 23 mi |
| All Around Underground Contractors, Inc | 5.0★ (2) | 16 mi |
| Carlos Sewer Services | 7 mi | |
| Discounted Rooter, West Covina CA | 6 mi | |
| DP Plumbing & Sewer INC | 6 mi | |
| Drainology Sewers and Plumbing | 9 mi | |
| Dustin Plumbing, Drain & Sewer | 1.0★ (1) | 19 mi |
| Eazy Plumbing and Rooter Sewer inspections | 10 mi | |
| GLPS Plumbing & Mechanical Srvs. | 5.0★ (1) | 12 mi |
| Grbcon, Inc. | 10 mi | |
| Liz Septic | 5.0★ (2) | 11 mi |
| Plumber Pasadena Sewer Cleaning | 5.0★ (1) | 20 mi |
| Plumbing Buddies - Plumber, Tankless Water Heater Replacement & Water Heater Removal, Sewer Repair & Pipe Installation in Glendora, CA | 7 mi | |
| Plumbing Method | Emergency Plumbers Chino | 8 mi | |
| Quality Pumping Services inc. | 5.0★ (2) | 20 mi |
| Renowned Plumbing & Rooter | 9 mi | |
| Sewer King | 5.0★ (1) | 16 mi |
| Tony's Rooter Service Sewer and Drain Paramedics | 5.0★ (1) | 10 mi |
| United Site Services | 5.0★ (1) | 9 mi |
| West Coast Environmental Services Inc. | 9 mi |
How we ranked Diamond Bar septic service companies
We scored 118 Diamond Bar 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 Diamond Bar 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 Diamond Bar: frequently asked questions
Who is the best septic service company in Diamond Bar?
By CR Score, the highest-ranked septic service company in Diamond Bar, CA is EZ Sewers Rooter and Plumbing with a CR Score of 59/100. It has 5.0★ from 130 Google reviews. It is open 24/7. I Love Sewers Rooter And Plumbing Sewer Specialties Inc (#2) and Option One Plumbing (#3) follow. We ranked 118 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Diamond Bar?
ContractorsRanked ranks 118 septic service companies serving Diamond Bar, CA. Another 20 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Diamond Bar are open 24/7?
67 ranked septic service companies in Diamond Bar post 24/7 hours. The highest-ranked are EZ Sewers Rooter and Plumbing (#1), I Love Sewers Rooter And Plumbing Sewer Specialties Inc (#2) and Option One Plumbing (#3). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Diamond Bar work on weekends?
95 of 118 ranked septic service companies post Saturday hours and 79 post Sunday hours. The highest-ranked open Saturdays are EZ Sewers Rooter and Plumbing (#1), I Love Sewers Rooter And Plumbing Sewer Specialties Inc (#2) and Option One Plumbing (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Diamond Bar septic service companies have?
The median Google rating among 118 rated septic service companies in Diamond Bar is 4.9★, with a median of 38 reviews. Option One Plumbing has the most, 3,017 reviews, and ranks #3. 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 Diamond Bar count in this ranking?
Yes, if they are within 25 mi of the Diamond Bar 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 Diamond Bar
- November 2026: CR Scores recalculated for 118 septic service companies serving Diamond Bar.
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