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Fremont, CA

Mold Inspection and Testing in Fremont, CA

Fremont, CA has 7 mold inspection and testing companies in our listings, 5 list themselves as open 24 hours and the most reviewed is Roto-Rooter Plumbing & Water Cleanup with 259 reviews.

7 Companies Doing Mold Testing Work in Fremont

  1. 1

    One Call Services24/7

    3269 Seldon Ct · Fremont 0.7 mi

    Google rating 4.8 from 57 Google reviews Yelp 4.9 · Facebook 5.0 · BBB profile

    Top Rated 2026

    Water DamageMoldMold TestingFire and SmokeSewage

  2. 2

    Dansel Restoration, Inc.24/7

    43177 Osgood Rd · Fremont 0.7 mi

    Google rating 4.9 from 65 Google reviews Yelp 4.7 · BBB profile

    Top Rated 2026

    Water DamageMoldMold TestingFire and SmokeSewage

  3. 3

    911 Restoration of East Bay SF24/7

    Service area business · Fremont 1.3 mi

    Google rating 5.0 from 3 Google reviews

    Verified Remediation Pro

    Water DamageMoldMold TestingFire and SmokeSewage

  4. 4

    Foster's Elite Property Improvements24/7

    41791 Osgood Rd · Fremont 1.4 mi

    Google rating 4.4 from 14 Google reviews Yelp 4.6 · Facebook 5.0 · BBB profile

    Verified Remediation Pro

    Water DamageMoldMold TestingFire and SmokeSewage

  5. 5

    Northern California Environmental Testing

    47000 Warm Springs Blvd #115 · Fremont 1.9 mi

    No public reviews yet

    Verified Remediation Pro

    MoldMold TestingAsbestosLead Paint

  6. 6

    Al Water

    40339 Blacow Rd · Fremont 2.2 mi

    Google rating 5.0 from 11 Google reviews

    Highly Rated 2026

    Water DamageMoldMold TestingFire and SmokeSewage

  7. 7

    Roto-Rooter Plumbing & Water Cleanup24/7

    41111 Mission Blvd · Fremont 2.8 mi

    Google rating 4.9 from 259 Google reviews

    Top Rated 2026Most Reviewed 2026

    Water DamageMoldMold TestingSewage

Hire an Independent Inspector

A mold inspector tells you whether you have a problem, where it is and what caused it. A remediator removes it. When the same company does both, it has a reason to find mold. If you can, hire an inspector who does not do remediation, and ask the remediator to follow that inspector’s written plan.

Ask the inspector what the visit includes. A good one looks for the moisture source first, uses a moisture meter and often a thermal camera, and only takes air or surface samples when the result will change what you do. After the work, a clearance test by the same independent inspector shows whether the job is done.

How to read a mold lab report

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.

Read the step by step guide

Reviews on Other Sites in Fremont

On Angi

We did not find an Angi profile we could match to a company here yet.

Have a BBB Profile (3)

Also matched here, 3 on Yelp and 2 on Facebook. Those show on each company row above.

A BBB profile is a listing with the Better Business Bureau. It is not the same as BBB accreditation. We only list a profile when its name and city match the company.

What It Costs Around Fremont

Prices in the San Jose-Sunnyvale-Santa Clara, CA area run about 10 percent above the national average, so local jobs tend to cost more than the national figures.

JobTypical in FremontNational typical
Mold Inspection and Testingper visit, a visual inspection$225 to $650$200 to $600
Mold Inspection and Testingper visit, an inspection with samples$325 to $1,100$300 to $1,000
Mold Inspection and Testingper visit, a clearance test$325 to $900$300 to $800

Full San Jose cost guide

Questions to Ask Before You Hire

  1. Do you also do remediation? If so, who checks your work?
  2. How many air samples will you take, and will you take an outdoor control sample?
  3. Which lab analyzes the samples, and is it accredited?
  4. Will the report include moisture readings and photos, not only lab numbers?
  5. Are you licensed as a mold assessor where this home is?

Guides for This Job

Questions People Ask

How many mold inspection and testing companies serve Fremont?
We list 7 companies in Fremont, CA. 1 of them work from a service area without a public storefront.
Which mold inspection and testing companies in Fremont are open 24 hours?
5 list themselves as open around the clock, including Roto-Rooter Plumbing & Water Cleanup, Dansel Restoration, Inc. and One Call Services. Hours are self reported, so call to confirm someone answers at night.
Who has the best reviews in Fremont?
Among companies with at least 20 public reviews, the highest rated are Roto-Rooter Plumbing & Water Cleanup (4.9 from 259), Dansel Restoration, Inc. (4.9 from 65) and One Call Services (4.8 from 57). A high rating from a small number of reviews is weaker evidence than a slightly lower rating from hundreds.

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