62/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.7★ from 1,367 Google reviews, listed on Google as “Pest control service”.
Best Pest Control Companies in Diamond Bar, CA (2026)
528 pest control companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Diamond Bar: Orkin, CR Score 62/100; 4.7★ from 1,367 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Orkin, posts 24/7 hours; ranked #2 of 528.
- 12
Most-reviewed: Brooks Pest Control, 11,523 Google reviews at 4.6★, the most of 528 ranked; ranked #12.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
528 Diamond Bar pest control companies are ranked here by CR Score, from ten published factors. 131 are open 24/7, 368 open Saturdays and 207 open Sundays, based on posted hours. The median Google rating is 4.9★ across 528 rated businesses.
Top 10 pest control companies in Diamond Bar at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Orkin | 62 | 4.7★ (1,367) | Claremont, 8 mi away | 24/7 | Overall |
| 2 | Orkin | 62 | 4.8★ (3,213) | Anaheim, 15 mi away | 24/7 | Emergencies |
| 3 | CURA Termite & Pest Control - West Covina | 62 | 5.0★ (252) | West Covina, 7 mi away | 24/7 | — |
| 4 | Orkin | 62 | 4.8★ (387) | San Dimas, 5 mi away | 24/7 | — |
| 5 | Orkin | 61 | 4.8★ (3,667) | Riverside, 20 mi away | 24/7 | — |
| 6 | Western Exterminator | 61 | 4.7★ (596) | Chino, 8 mi away | 24/7 | — |
| 7 | Orkin | 61 | 4.9★ (460) | Anaheim, 12 mi away | 24/7 | — |
| 8 | Terminix | 61 | 4.7★ (2,287) | Santa Fe Springs, 16 mi away | 24/7 | — |
| 9 | Orkin | 60 | 4.8★ (306) | Brea, 9 mi away | 24/7 | — |
| 10 | Aptive Pest Control | 60 | 4.7★ (7,199) | Yorba Linda, 11 mi away | Sat · Evenings | — |
The 528 best pest control 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.
#2 Orkin
Based in Anaheim, 15 mi away
62/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.8★ from 3,213 Google reviews, listed on Google as “Pest control service”.
Based in West Covina, 7 mi away
62/100CR ScoreRanked #3 because of its Google rating and trade focus: 5.0★ from 252 Google reviews, listed on Google as “Pest control service”.
#4 Orkin
Based in San Dimas, 5 mi away
62/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.8★ from 387 Google reviews, listed on Google as “Pest control service”.
#5 Orkin
Based in Riverside, 20 mi away
61/100CR ScoreRanked #5 because of its Google rating and trade focus: 4.8★ from 3,667 Google reviews, listed on Google as “Pest control service”.
Based in Chino, 8 mi away
61/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.7★ from 596 Google reviews, listed on Google as “Pest control service”.
#7 Orkin
Based in Anaheim, 12 mi away
61/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.9★ from 460 Google reviews, listed on Google as “Pest control service”.
#8 Terminix
Based in Santa Fe Springs, 16 mi away
61/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.7★ from 2,287 Google reviews, listed on Google as “Pest control service”.
#9 Orkin
Based in Brea, 9 mi away
60/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.8★ from 306 Google reviews, listed on Google as “Pest control service”.
Based in Yorba Linda, 11 mi away
60/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.7★ from 7,199 Google reviews, listed on Google as “Pest control service”.
Based in Ontario, 8 mi away
60/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.8★ from 244 Google reviews, listed on Google as “Pest control service”.
Based in Corona, 18 mi away
60/100CR ScoreRanked #12 because of its Google rating and review volume: 4.6★ from 11,523 Google reviews, the most in Diamond Bar.
Based in Anaheim, 16 mi away
60/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.9★ from 562 Google reviews, listed on Google as “Pest control service”.
#14 the bugman
Based in Anaheim, 13 mi away
60/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.9★ from 2,576 Google reviews, listed on Google as “Pest control service”.
#15 Terminix
Based in Anaheim, 15 mi away
60/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.9★ from 389 Google reviews, listed on Google as “Pest control service”.
Based in Corona, 16 mi away
60/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.7★ from 9,224 Google reviews, listed on Google as “Pest control service”.
Based in Walnut, 3 mi away
60/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.8★ from 525 Google reviews, listed on Google as “Pest control service”.
#18 Orkin
Based in Costa Mesa, 24 mi away
59/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.8★ from 1,992 Google reviews, listed on Google as “Pest control service”.
Based in Los Alamitos, 20 mi away
59/100CR ScoreRanked #19 because of its Google rating and trade focus: 4.7★ from 4,764 Google reviews, listed on Google as “Pest control service”.
Based in Placentia, 11 mi away
59/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.9★ from 320 Google reviews, listed on Google as “Pest control service”.
Based in Baldwin Park, 10 mi away
59/100CR ScoreRanked #21 because of its Google rating and trade focus: 4.7★ from 135 Google reviews, listed on Google as “Pest control service”.
Based in Chino Hills, 8 mi away
59/100CR ScoreRanked #22 because of its Google rating and trade focus: 5.0★ from 112 Google reviews, listed on Google as “Pest control service”.
Based in Fontana, 8 mi away
59/100CR ScoreRanked #23 because of its Google rating and trade focus: 5.0★ from 45 Google reviews, listed on Google as “Pest control service”.
Based in Fontana, 11 mi away
59/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.7★ from 1,940 Google reviews, listed on Google as “Pest control service”.
Based in Orange, 14 mi away
59/100CR ScoreRanked #25 because of its Google rating and trade focus: 5.0★ from 301 Google reviews, listed on Google as “Pest control service”.
Pest control 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 528 ranked pest control companies here; the rest are on their profiles.
Also serving Diamond Bar
20 more pest control 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 |
|---|---|---|
| All Diamond Bar Insect & Rodent Solutions | 5.0★ (1) | In Diamond Bar |
| All Pro Pest Control | 5.0★ (2) | 9 mi |
| Apex Shield Exterminators | 4.5★ (2) | In Diamond Bar |
| B & S Pest Control Corporation Claremont CA | 5.0★ (2) | 9 mi |
| Bio Pest Control Shield | 4.5★ (2) | 9 mi |
| Clean Shield Pest Control | In Diamond Bar | |
| Crest Pest Control | 5.0★ (2) | 9 mi |
| EcoZone Pest Control | 5.0★ (2) | 7 mi |
| Everguard Exterminators | 3.0★ (2) | 8 mi |
| Impressive Exterminating | 5.0★ (2) | 9 mi |
| Lady Bugs Termite & Pest Control | 5.0★ (2) | 10 mi |
| Mercury Termite & Pest Control | 3.0★ (2) | 7 mi |
| Morgan Termite Control | 5.0★ (2) | 9 mi |
| Nexa Guard Pest Services | 4.5★ (2) | 3 mi |
| OC Bug Company | 5.0★ (2) | 9 mi |
| Pastene Pest Control | 4.0★ (2) | 6 mi |
| Pest Commander Pest Control | 5.0★ (2) | 5 mi |
| Termike Pest Control | 5.0★ (1) | In Diamond Bar |
| The Bug Solution | 5.0★ (2) | 10 mi |
| Yorba Linda Pest Control | 5.0★ (2) | 10 mi |
How we ranked Diamond Bar pest control companies
We scored 528 Diamond Bar pest control 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 |
Pest control companies in Diamond Bar: frequently asked questions
Who is the best pest control company in Diamond Bar?
By CR Score, the highest-ranked pest control company in Diamond Bar, CA is Orkin with a CR Score of 62/100. It has 4.7★ from 1,367 Google reviews. It is open 24/7. Orkin (#2) and CURA Termite & Pest Control - West Covina (#3) follow. We ranked 528 pest control companies on ten factors, last updated November 3, 2026.
How many pest control companies are there in Diamond Bar?
ContractorsRanked ranks 528 pest control companies serving Diamond Bar, CA. Another 20 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which pest control companies in Diamond Bar are open 24/7?
131 ranked pest control companies in Diamond Bar post 24/7 hours. The highest-ranked are Orkin (#1), Orkin (#2) and CURA Termite & Pest Control - West Covina (#3). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which pest control companies in Diamond Bar work on weekends?
368 of 528 ranked pest control companies post Saturday hours and 207 post Sunday hours. The highest-ranked open Saturdays are Orkin (#1), Orkin (#2) and CURA Termite & Pest Control - West Covina (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Diamond Bar pest control companies have?
The median Google rating among 528 rated pest control companies in Diamond Bar is 4.9★, with a median of 20 reviews. Brooks Pest Control has the most, 11,523 reviews, and ranks #12. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ContractorsRanked rank pest control companies?
Each pest control 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 pest control 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 pest control 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 pest control 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 528 pest control companies serving Diamond Bar.
- November 2026: 13 duplicate listings merged.
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