65/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.9★ from 733 Google reviews, listed on Google as “Pest control service”.
Best Pest Control Companies in O'Fallon, IL (2026)
44 pest control companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in O'Fallon: Rottler Pest Solutions, CR Score 65/100; 4.9★ from 733 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Mosquito Squad of St. Louis Metro East, posts 24/7 hours; ranked #2 of 44.
- 6
Most-reviewed: Holper's Pest & Animal Solutions STL, 2,085 Google reviews at 4.9★, the most of 44 ranked; ranked #6.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
44 O'Fallon pest control companies are ranked here by CR Score, from ten published factors. 11 are open 24/7, 29 open Saturdays and 19 open Sundays, based on posted hours. The median Google rating is 4.9★ across 44 rated businesses.
Most of this list also appears on the Pest control companies in Belleville ranking. See Pest control companies in Belleville
Top 10 pest control companies in O'Fallon at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Rottler Pest Solutions | 65 | 4.9★ (733) | Fairview Heights, 4 mi away | 24/7 | Overall |
| 2 | Mosquito Squad of St. Louis Metro East | 62 | 4.9★ (115) | Belleville, 7 mi away | 24/7 | Emergencies |
| 3 | Rottler Pest Solutions | 62 | 4.9★ (1,656) | St. Louis, 25 mi away | 24/7 | — |
| 4 | STL Pest Control | 61 | 4.9★ (1,852) | St. Louis, 20 mi away | Sat · Sun · Evenings | — |
| 5 | Teacher's Spraying Service | 59 | 5.0★ (630) | St. Louis, 24 mi away | Sat · Sun | — |
| 6 | Holper's Pest & Animal Solutions STL | 59 | 4.9★ (2,085) | St. Louis, 22 mi away | Sat | Most reviews |
| 7 | Rottler Pest Solutions | 58 | 4.6★ (511) | St. Louis, 25 mi away | 24/7 | — |
| 8 | Mo's Pest Control | 57 | 4.8★ (24) | St. Louis, 14 mi away | 24/7 | — |
| 9 | Pointe Pest Control - Ferguson | 57 | 4.9★ (580) | Ferguson, 24 mi away | Sat · Evenings | — |
| 10 | OMNI Pest Solutions | 57 | 5.0★ (302) | Clayton, 23 mi away | Sat · Evenings | — |
The 44 best pest control companies in O'Fallon, 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 Belleville, 7 mi away
62/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.9★ from 115 Google reviews, listed on Google as “Pest control service”.
Based in St. Louis, 25 mi away
62/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.9★ from 1,656 Google reviews, listed on Google as “Pest control service”.
Based in St. Louis, 20 mi away
61/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.9★ from 1,852 Google reviews, listed on Google as “Pest control service”.
Based in St. Louis, 24 mi away
59/100CR ScoreRanked #5 because of its Google rating and trade focus: 5.0★ from 630 Google reviews, listed on Google as “Pest control service”.
Based in St. Louis, 22 mi away
59/100CR ScoreRanked #6 because of its Google rating and review volume: 4.9★ from 2,085 Google reviews, the most in O'Fallon.
Based in St. Louis, 25 mi away
58/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.6★ from 511 Google reviews, listed on Google as “Pest control service”.
Based in St. Louis, 14 mi away
57/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.8★ from 24 Google reviews, listed on Google as “Pest control service”.
Based in Ferguson, 24 mi away
57/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.9★ from 580 Google reviews, listed on Google as “Pest control service”.
Based in Clayton, 23 mi away
57/100CR ScoreRanked #10 because of its Google rating and trade focus: 5.0★ from 302 Google reviews, listed on Google as “Pest control service”.
Based in St. Louis, 24 mi away
56/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.8★ from 79 Google reviews, listed on Google as “Pest control service”.
Based in St. Louis, 15 mi away
56/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.8★ from 47 Google reviews, listed on Google as “Pest control service”.
Based in St. Louis, 18 mi away
56/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.9★ from 50 Google reviews, listed on Google as “Pest control service”.
Based in St. Louis, 16 mi away
55/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.3★ from 128 Google reviews, listed on Google as “Pest control service”.
Based in St. Louis, 19 mi away
55/100CR ScoreRanked #15 because of its Google rating and trade focus: 5.0★ from 15 Google reviews, listed on Google as “Pest control service”.
Based in St. Louis, 25 mi away
55/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.8★ from 111 Google reviews, listed on Google as “Pest control service”.
Based in St. Louis, 18 mi away
55/100CR ScoreRanked #17 because of its Google rating and trade focus: 5.0★ from 71 Google reviews, listed on Google as “Pest control service”.
Based in St. Louis, 19 mi away
54/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.6★ from 11 Google reviews, listed on Google as “Pest control service”.
#19 PestShield
Based in Webster Groves, 23 mi away
54/100CR ScoreRanked #19 because of its Google rating and trade focus: 4.8★ from 399 Google reviews, listed on Google as “Pest control service”.
Based in St. Louis, 16 mi away
54/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.0★ from 6 Google reviews, listed on Google as “Pest control service”.
Based in St. Louis, 23 mi away
54/100CR ScoreRanked #21 because of its Google rating and trade focus: 4.9★ from 27 Google reviews, listed on Google as “Pest control service”.
Based in St. Louis, 16 mi away
53/100CR ScoreRanked #22 because of its Google rating and trade focus: 4.9★ from 8 Google reviews, listed on Google as “Pest control service”.
Based in Maplewood, 22 mi away
53/100CR ScoreRanked #23 because of its Google rating and trade focus: 5.0★ from 56 Google reviews, listed on Google as “Pest control service”.
Based in O'Fallon, 18 mi away
53/100CR ScoreRanked #24 because of its Google rating and trade focus: 5.0★ from 17 Google reviews, listed on Google as “Pest control service”.
#25 Bug Out
Based in St. Louis, 17 mi away
52/100CR ScoreRanked #25 because of its Google rating and review volume: 4.9★ from 87 Google reviews.
How we ranked O'Fallon pest control companies
We scored 44 O'Fallon 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 O'Fallon 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 O'Fallon: frequently asked questions
Who is the best pest control company in O'Fallon?
By CR Score, the highest-ranked pest control company in O'Fallon, IL is Rottler Pest Solutions with a CR Score of 65/100. It has 4.9★ from 733 Google reviews. It is open 24/7. Mosquito Squad of St. Louis Metro East (#2) and Rottler Pest Solutions (#3) follow. We ranked 44 pest control companies on ten factors, last updated November 3, 2026.
How many pest control companies are there in O'Fallon?
ContractorsRanked ranks 44 pest control companies serving O'Fallon, IL. Counts are as of November 2026.
Which pest control companies in O'Fallon are open 24/7?
11 ranked pest control companies in O'Fallon post 24/7 hours. The highest-ranked are Rottler Pest Solutions (#1), Mosquito Squad of St. Louis Metro East (#2) and Rottler Pest Solutions (#3). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which pest control companies in O'Fallon work on weekends?
29 of 44 ranked pest control companies post Saturday hours and 19 post Sunday hours. The highest-ranked open Saturdays are Rottler Pest Solutions (#1), Mosquito Squad of St. Louis Metro East (#2) and Rottler Pest Solutions (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do O'Fallon pest control companies have?
The median Google rating among 44 rated pest control companies in O'Fallon is 4.9★, with a median of 42 reviews. Holper's Pest & Animal Solutions STL has the most, 2,085 reviews, and ranks #6. 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 O'Fallon count in this ranking?
Yes, if they are within 25 mi of the O'Fallon 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 O'Fallon
- November 2026: CR Scores recalculated for 44 pest control companies serving O'Fallon.
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