62/100CR Score
Ranked #1 because of its Google rating and review volume: 4.9★ from 369 Google reviews, the most in Union.
Best Pest Control Companies in Union, MO (2026)
13 pest control companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Union: Mosquito Squad of West St. Louis County, CR Score 62/100; 4.9★ from 369 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Heartland Pest and Termite Control, posts 24/7 hours; ranked #2 of 13.
- 5
Most-reviewed: Buckingham Pest Control, 278 Google reviews at 5.0★, the most of 13 ranked after Mosquito Squad of West St. Louis County; ranked #5.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
13 Union pest control companies are ranked here by CR Score, from ten published factors. 2 are open 24/7, 10 open Saturdays and 3 open Sundays, based on posted hours. The median Google rating is 5.0★ across 13 rated businesses.
Top 10 pest control companies in Union at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Mosquito Squad of West St. Louis County | 62 | 4.9★ (369) | Lake Saint Louis, 24 mi away | 24/7 | Overall |
| 2 | Heartland Pest and Termite Control | 58 | 5.0★ (45) | Wildwood, 23 mi away | 24/7 | Emergencies |
| 3 | Evo Pest Control | 57 | 4.8★ (170) | Ellisville, 24 mi away | Sat · Evenings | — |
| 4 | Around the Clock Pest Control | 57 | 4.9★ (69) | St. Louis, 17 mi away | Sat | — |
| 5 | Buckingham Pest Control | 56 | 5.0★ (278) | Wildwood, 20 mi away | Sat | Most reviews |
| 6 | All Solutions Pest Control | 56 | 5.0★ (197) | O'Fallon, 25 mi away | — | — |
| 7 | All Solutions Pest Control | 56 | 5.0★ (159) | Ellisville, 25 mi away | — | — |
| 8 | Eagle Pest Control | 54 | 5.0★ (15) | O'Fallon, 19 mi away | Sat | — |
| 9 | Humane Wildlife Solutions LLC | 52 | 4.9★ (87) | Berkeley, 14 mi away | Sat | — |
| 10 | Wildwood Pest Control | 52 | 5.0★ (3) | Wildwood, 22 mi away | Sat · Sun · Evenings | — |
The 13 best pest control companies in Union, 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 Wildwood, 23 mi away
58/100CR ScoreRanked #2 because of its Google rating and trade focus: 5.0★ from 45 Google reviews, listed on Google as “Pest control service”.
Based in Ellisville, 24 mi away
57/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.8★ from 170 Google reviews, listed on Google as “Pest control service”.
Based in St. Louis, 17 mi away
57/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.9★ from 69 Google reviews, listed on Google as “Pest control service”.
Based in Wildwood, 20 mi away
56/100CR ScoreRanked #5 because of its Google rating and review volume: 5.0★ from 278 Google reviews.
Based in O'Fallon, 25 mi away
56/100CR ScoreRanked #6 because of its Google rating and trade focus: 5.0★ from 197 Google reviews, listed on Google as “Pest control service”.
Based in Ellisville, 25 mi away
56/100CR ScoreRanked #7 because of its Google rating and trade focus: 5.0★ from 159 Google reviews, listed on Google as “Pest control service”.
Based in O'Fallon, 19 mi away
54/100CR ScoreRanked #8 because of its Google rating and trade focus: 5.0★ from 15 Google reviews, listed on Google as “Pest control service”.
Based in Berkeley, 14 mi away
52/100CR ScoreRanked #9 because of its Google rating and review volume: 4.9★ from 87 Google reviews.
Based in Wildwood, 22 mi away
52/100CR ScoreRanked #10 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Pest control service”.
Based in Florissant, 21 mi away
51/100CR ScoreRanked #11 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Pest control service”.
Based in Wentzville, 19 mi away
50/100CR ScoreRanked #12 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Pest control service”.
Based in Lake Saint Louis, 24 mi away
49/100CR ScoreRanked #13 because of its Google rating and review volume: 4.8★ from 67 Google reviews.
Also serving Union
1 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 |
|---|---|---|
| Bay's Termite & Pest Control | 5.0★ (1) | 22 mi |
How we ranked Union pest control companies
We scored 13 Union 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 Union 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 Union: frequently asked questions
Who is the best pest control company in Union?
By CR Score, the highest-ranked pest control company in Union, MO is Mosquito Squad of West St. Louis County with a CR Score of 62/100. It has 4.9★ from 369 Google reviews. It is open 24/7. Heartland Pest and Termite Control (#2) and Evo Pest Control (#3) follow. We ranked 13 pest control companies on ten factors, last updated November 3, 2026.
How many pest control companies are there in Union?
ContractorsRanked ranks 13 pest control companies serving Union, MO. Another 1 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which pest control companies in Union are open 24/7?
2 ranked pest control companies in Union post 24/7 hours. The highest-ranked are Mosquito Squad of West St. Louis County (#1) and Heartland Pest and Termite Control (#2). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which pest control companies in Union work on weekends?
10 of 13 ranked pest control companies post Saturday hours and 3 post Sunday hours. The highest-ranked open Saturdays are Mosquito Squad of West St. Louis County (#1), Heartland Pest and Termite Control (#2) and Evo Pest Control (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Union pest control companies have?
The median Google rating among 13 rated pest control companies in Union is 5.0★, with a median of 69 reviews. Mosquito Squad of West St. Louis County has the most, 369 reviews, and ranks #1. 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 Union count in this ranking?
Yes, if they are within 25 mi of the Union 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 Union
- November 2026: CR Scores recalculated for 13 pest control companies serving Union.
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