Ontario, CA
Mold Inspection and Testing in Ontario, CA
Ontario, CA has 7 mold inspection and testing companies in our listings, 2 list themselves as open 24 hours and the most reviewed is United Water Restoration Group of Ontario with 80 reviews.
7 Companies Doing Mold Testing Work in Ontario
- 1
United Water Restoration Group of Ontario24/7
4.9 from 80 public reviews
Water DamageMoldMold TestingFire and SmokeSewage
- 2
- 3
- 4
- 5
Rytech Restoration of Ontario
5.0 from 1 public review
Water DamageMoldMold TestingFire and SmokeSewage
- 6
- 7
Can You Handle It Yourself
Call a pro
Home test kits that grow spores in a dish almost always grow something, because mold spores are everywhere. They cannot tell you whether you have a problem. A moisture meter and a flashlight will tell you more for less money.
Questions to Ask Before You Hire
- Do you also do remediation? If so, who checks your work?
- How many air samples will you take, and will you take an outdoor control sample?
- Which lab analyzes the samples, and is it accredited?
- Will the report include moisture readings and photos, not only lab numbers?
- Are you licensed as a mold assessor where this home is?
Guides for This Job
- Call a proMold Testing, When It Is Worth It and How to Read a Lab ReportWhen a mold test is worth paying for, which kind to ask for, why store kits mislead, and how to read spore counts, outdoor controls and a lab report yourself.
- DIY with careMold Remediation Cost in 2025 and 2026Typical 2025 to 2026 mold remediation costs by area and location, from bathrooms to attics, plus testing, containment and rebuild, and what moves the price.
- Call a proMold Testing, When It Is Worth It and How to Read a Lab ReportWhen a mold test is worth paying for, which kind to ask for, why store kits mislead, and how to read spore counts, outdoor controls and a lab report yourself.
- DIY with careAttic Mold on Roof Sheathing, Causes and FixesWhy mold grows on attic roof sheathing, how to find the cause, the fixes that stop it for good, and how to tell a cosmetic stain from a roof that needs work.
Questions People Ask
How many mold inspection and testing companies serve Ontario?
We list 7 companies in Ontario, CA. 1 of them work from a service area without a public storefront.
Which mold inspection and testing companies in Ontario are open 24 hours?
2 list themselves as open around the clock, including United Water Restoration Group of Ontario and Water Damage Ontario. Hours are self reported, so call to confirm someone answers at night.
Who has the best reviews in Ontario?
Among companies with at least 20 public reviews, the highest rated are Dry Masters (5.0 from 26) and United Water Restoration Group of Ontario (4.9 from 80). A high rating from a small number of reviews is weaker evidence than a slightly lower rating from hundreds.
All restoration companies in Ontario · Mold Inspection and Testing in every market