64/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.8★ from 447 Google reviews, listed on Google as “Swimming pool repair service”.
Best Pool Builders in Ontario, CA (2026)
668 pool builders ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Ontario: PoolGenX, CR Score 64/100; 4.8★ from 447 Google reviews; open 24/7.
- 5
Best for emergencies (open 24/7): ORCA Pool Cleaning Service and Maintenance, posts 24/7 hours; ranked #5 of 668.
- 4
Most-reviewed: Inland Empire Hot Spring Spas, 773 Google reviews at 4.9★, the most of 668 ranked; ranked #4.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
668 Ontario pool builders are ranked here by CR Score, from ten published factors. 70 are open 24/7, 403 open Saturdays and 196 open Sundays, based on posted hours. The median Google rating is 4.8★ across 668 rated businesses.
Top 10 pool builders in Ontario at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | PoolGenX | 64 | 4.8★ (447) | Riverside, 16 mi away | 24/7 | Overall |
| 2 | Gary's Swimming Pool Supplies | 62 | 4.7★ (220) | Upland, 3 mi away | Sat · Sun | — |
| 3 | VINYL POOL PROS | 62 | 4.9★ (156) | Rancho Cucamonga, 6 mi away | Sat · Sun | — |
| 4 | Inland Empire Hot Spring Spas | 62 | 4.9★ (773) | Moreno Valley, 28 mi away | Sat · Sun | Most reviews |
| 5 | ORCA Pool Cleaning Service and Maintenance | 61 | 5.0★ (31) | Rancho Cucamonga, 2 mi away | 24/7 | Emergencies |
| 6 | CR Quality Pool Service - Professional Pool Maintenance Service | 60 | 4.8★ (100) | Moreno Valley, 9 mi away | Sat · Sun · Evenings | — |
| 7 | Pool Cleaning Service and Maintenance | 60 | 4.9★ (63) | Claremont, 5 mi away | Sat · Sun · Evenings | — |
| 8 | LUX Pool Services | 60 | 5.0★ (20) | Ontario | 24/7 | — |
| 9 | Saddleback Mountain pool and spa service | 60 | 5.0★ (253) | Rancho Santa Margarita, 29 mi away | Sat · Sun · Evenings | — |
| 10 | AQUA POOL PRO | 60 | 5.0★ (37) | Rancho Cucamonga, 1 mi away | Sat · Sun · Evenings | — |
The 668 best pool builders in Ontario, 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 Upland, 3 mi away
62/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.7★ from 220 Google reviews, listed on Google as “Swimming pool contractor”.
Based in Rancho Cucamonga, 6 mi away
62/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.9★ from 156 Google reviews, listed on Google as “Swimming pool repair service”.
Based in Moreno Valley, 28 mi away
62/100CR ScoreRanked #4 because of its Google rating and review volume: 4.9★ from 773 Google reviews, the most in Ontario.
Based in Rancho Cucamonga, 2 mi away
61/100CR ScoreRanked #5 because of its Google rating and trade focus: 5.0★ from 31 Google reviews, listed on Google as “Swimming pool repair service”.
Based in Moreno Valley, 9 mi away
60/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.8★ from 100 Google reviews, listed on Google as “Swimming pool contractor”.
Based in Claremont, 5 mi away
60/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.9★ from 63 Google reviews, listed on Google as “Swimming pool contractor”.
Based in Ontario
60/100CR ScoreRanked #8 because of its Google rating and trade focus: 5.0★ from 20 Google reviews, listed on Google as “Swimming pool contractor”.
Based in Rancho Santa Margarita, 29 mi away
60/100CR ScoreRanked #9 because of its Google rating and trade focus: 5.0★ from 253 Google reviews, listed on Google as “Swimming pool contractor”.
#10 AQUA POOL PRO
Based in Rancho Cucamonga, 1 mi away
60/100CR ScoreRanked #10 because of its Google rating and trade focus: 5.0★ from 37 Google reviews, listed on Google as “Swimming pool contractor”.
Based in Rancho Cucamonga, 4 mi away
60/100CR ScoreRanked #11 because of its Google rating and trade focus: 5.0★ from 20 Google reviews, listed on Google as “Swimming pool contractor”.
Based in Fontana, 13 mi away
60/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.7★ from 125 Google reviews, listed on Google as “Swimming pool contractor”.
Based in Rancho Cucamonga, 5 mi away
60/100CR ScoreRanked #13 because of its Google rating and trade focus: 5.0★ from 176 Google reviews, listed on Google as “Swimming pool repair service”.
Based in Chino Hills, 8 mi away
59/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.9★ from 46 Google reviews, listed on Google as “Swimming pool contractor”.
Based in Rancho Cucamonga, 5 mi away
59/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.4★ from 89 Google reviews, listed on Google as “Swimming pool repair service”.
Based in Ontario
59/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.7★ from 75 Google reviews, listed on Google as “Swimming pool contractor”.
Based in Eastvale, 8 mi away
59/100CR ScoreRanked #17 because of its Google rating and trade focus: 5.0★ from 164 Google reviews, listed on Google as “Swimming pool repair service”.
Based in Upland, 5 mi away
59/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.6★ from 22 Google reviews, listed on Google as “Swimming pool repair service”.
Based in Ontario
59/100CR ScoreRanked #19 because of its Google rating and trade focus: 4.3★ from 51 Google reviews, listed on Google as “Swimming pool repair service”.
Based in Glendale, 35 mi away
58/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.9★ from 103 Google reviews, listed on Google as “Swimming pool repair service”.
Based in Arcadia, 22 mi away
58/100CR ScoreRanked #21 because of its Google rating and trade focus: 5.0★ from 68 Google reviews, listed on Google as “Swimming pool contractor”.
Based in Riverside, 16 mi away
58/100CR ScoreRanked #22 because of its Google rating and trade focus: 4.7★ from 72 Google reviews, listed on Google as “Swimming pool contractor”.
Based in Chino, 5 mi away
58/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.8★ from 60 Google reviews, listed on Google as “Swimming pool contractor”.
#24 Cali Coast Pools
Based in Glendora, 13 mi away
58/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.7★ from 24 Google reviews, listed on Google as “Swimming pool contractor”.
Based in Pomona, 4 mi away
58/100CR ScoreRanked #25 because of its Google rating and trade focus: 4.7★ from 26 Google reviews, listed on Google as “Swimming pool contractor”.
Pool builders 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 668 ranked pool builders here; the rest are on their profiles.
Also serving Ontario
20 more pool builders within 40 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 |
|---|---|---|
| 3m Pools | 5.0★ (2) | 7 mi |
| Aquaman Pool Service Chino Hills | 5.0★ (2) | 5 mi |
| Blue Pool Services | 1.0★ (2) | 11 mi |
| Bruno Diamond Pool and Spa LLC | In Ontario | |
| Coolwater Pools and Landscape | 5.0★ (2) | In Ontario |
| Corey Pool Care | 5.0★ (2) | 2 mi |
| Elite Pool Designs, Inc | 5.0★ (2) | 5 mi |
| Golden Leaf Construction, Inc. | 5.0★ (2) | In Ontario |
| h2o pro pool | 5.0★ (2) | 7 mi |
| Huntington Pools Inc. | 5.0★ (2) | 9 mi |
| Inland Empire Pool & Spa Company | 5.0★ (1) | In Ontario |
| Modern Builder Inc. | 5.0★ (2) | 8 mi |
| Modern Paving | 5.0★ (2) | 3 mi |
| OSHI Construction Inc. | 5.0★ (2) | 5 mi |
| Poolbrite | 5.0★ (1) | In Ontario |
| Rancho Cucamonga Pool Contractors | 5.0★ (2) | 6 mi |
| Ryan's Pool & Spa | 3.0★ (2) | 5 mi |
| Vern Anthony Gunite Inc | 1.0★ (1) | In Ontario |
| Vertical Pools | 5.0★ (2) | 2 mi |
| Water Visuals | 5.0★ (2) | 3 mi |
How we ranked Ontario pool builders
We scored 668 Ontario pool builders 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 Ontario 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 |
Pool builders in Ontario: frequently asked questions
Who is the best pool builder in Ontario?
By CR Score, the highest-ranked pool builder in Ontario, CA is PoolGenX with a CR Score of 64/100. It has 4.8★ from 447 Google reviews. It is open 24/7. Gary's Swimming Pool Supplies (#2) and VINYL POOL PROS (#3) follow. We ranked 668 pool builders on ten factors, last updated November 3, 2026.
How many pool builders are there in Ontario?
ContractorsRanked ranks 668 pool builders serving Ontario, CA. 3 of them are based in Ontario; the rest serve it from nearby towns. Another 20 within 40 mi are listed but not ranked yet. Counts are as of November 2026.
Which pool builders in Ontario are open 24/7?
70 ranked pool builders in Ontario post 24/7 hours. The highest-ranked are PoolGenX (#1), ORCA Pool Cleaning Service and Maintenance (#5) and LUX Pool Services (#8). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which pool builders in Ontario work on weekends?
403 of 668 ranked pool builders post Saturday hours and 196 post Sunday hours. The highest-ranked open Saturdays are PoolGenX (#1), Gary's Swimming Pool Supplies (#2) and VINYL POOL PROS (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Ontario pool builders have?
The median Google rating among 668 rated pool builders in Ontario is 4.8★, with a median of 13 reviews. Inland Empire Hot Spring Spas has the most, 773 reviews, and ranks #4. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ContractorsRanked rank pool builders?
Each pool builder 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 pool builders outside Ontario count in this ranking?
Yes, if they are within 40 mi of the Ontario city center, our service radius for pool builders. 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 pool builders 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 Ontario
- November 2026: CR Scores recalculated for 668 pool builders serving Ontario.
- November 2026: 6 duplicate listings merged.
More pool builders and Ontario pages
Pool builders near Ontario
- Pool builders in Upland, CA661 ranked
- Pool builders in Montclair, CA690 ranked
- Pool builders in Chino, CA717 ranked
- Pool builders in Rancho Cucamonga, CA642 ranked
- Pool builders in Claremont, CA725 ranked
- Pool builders in Pomona, CA749 ranked
- Pool builders in La Verne, CA757 ranked
- Pool builders in Chino Hills, CA754 ranked
- Pool builders in Eastvale, CA697 ranked
- Pool builders in Jurupa Valley, CA694 ranked
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