Top-rated mold testing and remediation specialists.

Get matched with top mold testing and remediation specialists in Walnut, CA

Enter your zip and get matched with up to 5 pros

Need a pro for your mold testing and remediation project in Walnut, CA?

Select your specific project to find the pro for you.

TRUSTED BY WALNUT, CA HOMEOWNERS

  • Average homeowner rating star icon4.9
    Average homeowner rating
  • Verified reviews icon19
    Verified mold testing and remediation services reviews

Verified Reviews for Mold Testing And Remediation pros in Walnut, CA

*The Angi rating for Mold Testing And Remediation companies in Walnut, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Mold Testing And Remediation needs.

*The HomeAdvisor rating for Mold Testing And Remediation companies in Walnut, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Mold Testing And Remediation needs.

Last update on August 24, 2026

Find Mold testing and remediation specialists in Walnut

Avatar for Pure Restoration Inc
Pure Restoration Inc
4.4(
84
)
Toxicity and Mold - RemovalDry-rot, Water or Pest Damage - Major RepairToxicity and Mold - Removal - For Business

Serving Walnut, CA and surrounding areas

Approved

In business since 2001

Free estimates

Emergency services offered

"The job went smoothly and was completed in a timely manner. The places where there was mold were identified and the drywall and/or insulation were removed. Any mold on wood framing were scrubbed."
Mold Remediation
Mold Remediation
Mold Remediation
Mold Remediation
Mold Remediation

+93

Response time1 day
Response rate100%
9 neighbors recently requested a quote
Request Quote
Avatar for Mold Solutionz 24/7
Mold Solutionz 24/7
4.2(
35
)
Mold & Toxic Material TestMold & Toxic Material Test - For Business

Serving Walnut, CA and surrounding areas

Approved

In business since 1995

Free estimates

Emergency services offered

"I appreciated Nick for his obvious knowledge and experience with remediation. He was the only one to really talk through options of the 5 companies that came. Everyone else said "this is what we need to do". His pricing seemed fair as well (ALL the quotes I got were expensive). I think he was the 2nd lowest quote. If it's an emergency, I'd say Nick is a fine choice. If you have time, I recommend getting a quote from 5 different companies (or more). An extra bonus with Nick is he has recommended contractors who can do the repairs or plumbing (if needed). But he does not push you to use them or make it seem like you have to use them. It is important to note that Nick only does the remediation. So if they need to cut into a wall or tear something out, it will be an additional cost to then repair it. But I could not find a company that did both remediation AND repair that I was comfortable with."
demo
pic 2
Response time11 hrs
Response rate89%
Recommended by89%of homeowners
Request Quote
Avatar for 911 Certified Mold Testing LLC
911 Certified Mold Testing LLC
5.0(
8
)
Mold & Toxic Material TestIndoor Air Quality TestingMold & Toxic Material Test - For Business

Serving Walnut, CA and surrounding areas

Approved

In business since 1995

Free estimates

Emergency services offered

"A few months ago I used 911 certified mold testing for my home they were referred to me by my plumber. I had a great experience dealing with this company they were very professional and knowledgeable about mold testing. They were also reasonable in their pricing! I highly recommend using this company for mold testing."
Response time4 hrs
Response rate93%
1 neighbors recently requested a quote
Request Quote
Avatar for Pure Mold Masters
Pure Mold Masters
5.0(
8
)
Mold & Toxic Material TestToxicity and Mold - RemovalMold & Toxic Material Test - For Business+1 more

Serving Walnut, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2011

Free estimates

Warranties offered

"Not only did Matt and his crew do an excellent job but they went above and beyond their excellent service."
House Fogs
House Fogs
House Fogs
House Fogs
Fog

+6

Response time9 hrs
Response rate92%
7 neighbors recently requested a quote
Request Quote
Avatar for Envirotech Restoration
Envirotech Restoration
4.9(
8
)
Indoor Air Quality TestingMold & Toxic Material Test

Serving Walnut, CA and surrounding areas

Approved

In business since 2019

Free estimates

Emergency services offered

"He is professional, honest and very good."
Response time1 day
3 neighbors recently requested a quote
Recommended by100%of homeowners
Request Quote
Avatar for Night And Day Restoration LLC
Night And Day Restoration LLC
5.0(
5
)
Mold & Toxic Material TestIndoor Air Quality TestingMold & Toxic Material Test - For Business

Serving Walnut, CA and surrounding areas

Approved

In business since 2023

Free estimates

Emergency services offered

Night & Day Restoration LLC specializes in water damage restoration and professional mold testing. Whether you're dealing with a leak, flooding, moisture concerns, or suspected mold, our team will assess the situation, explain what we find, and recommend the right next step.\nWe provide water extraction, structural drying, moisture detection, HEPA air filtration, mold air and surface testing, odor treatment, and structural cleaning. Our team is IICRC Water Restoration Technician (WRT) certified, and we pride ourselves on fast communication, detailed documentation, honest recommendations, and treating your home like it’s our own.\n

21 neighbors recently requested a quote
Request Quote
Avatar for Mold Test Company NO CA
Mold Test Company NO CA
3.8(
119
)
Mold & Toxic Material TestIndoor Air Quality TestingMold & Toxic Material Test - For Business

Serving Walnut, CA and surrounding areas

Approved

In business since 2018

Emergency services offered

Small jobs welcome

"Every step of the way was punctual, professional and well explained. I would recommend Mold Test Company to anyone."
Drywall
Drywall
Drywall
Insulation
Insulation

+71

Response time1 day
233 neighbors recently requested a quote
Recommended by81%of homeowners
Request Quote
Avatar for Hippo Home Inspections
Hippo Home Inspections
4.9(
153
)
Mold & Toxic Material TestIndoor Air Quality TestingMold & Toxic Material Test - For Business

Serving Walnut, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Emergency services offered

Small jobs welcome

"Excellent verbal and written communication. Timely LAB Report for three AIRBORNE tests for mold. A professional approach in offering additional services to help the customer with mold remediation."
Response time4 hrs
Response rate89%
60 neighbors recently requested a quote
Request Quote
Avatar for Quality Restoration inc
Quality Restoration inc
5.0(
9
)
Toxicity and Mold - RemovalToxicity and Mold - Removal - For Business

Serving Walnut, CA and surrounding areas

Approved

In business since 2021

Free estimates

Emergency services offered

"There crew where amazing on removing and the mold materials from my home I would recommend them to anyone"
1 neighbors recently requested a quote
Request Quote
...
Showing 1-10 of 256
Mold Testing and Remediation questions, answered by experts

The spread of wood rot results in a physical breakdown of the wood’s cellulose and lignin, causing it to become spongy or brittle. This can lead to structural damage. Water won’t damage the physical structure of the wood, while mold can eat away at the material and cause structural damage over a much longer timeframe. When further considering water damage versus mold versus wood rot, all three issues can create a musty or damp odor in the area. All three can also cause discoloration of the wood.

Checking for mold yourself is crucial, as catching mold in the early stages is ideal. Mold can appear green, brown, black, blue, or yellow. It can smell musty and can feel like velvet, leather, or cotton. 

Most often, mold grows near water damage. It’s best to inspect these places for signs of mold growth:

  • Basement: Look in corners, windows, carpet, closets, and around appliances. 

  • Bathrooms: Check around sinks, ceilings, and around toilets. 

  • Kitchen: Inspect around the sink, behind the refrigerator, and behind trash can.

  • Attic: Look near the insulation and near intake and exhaust vents.

Rust in your bathtub occurs when iron in the water or on metal components in your tub are exposed to oxygen, but while it’s unsightly, it won’t make bathing dangerous. However, if the rust appears under or around your tub spout or shower head, it could indicate that you have high levels of iron in your water. Drinking water with small amounts of iron in it usually doesn’t pose a health risk, but you might want to consider installing a water softener. The presence of iron could indicate that you have hard water, which can create some plumbing issues.

A stain from a water leak will usually be brown and concentrated in a single area where the water is originating from. You may find it under a damaged section of roof, under an upstairs bathroom, or beneath your HVAC system. Stains from condensation are more likely to be widespread since they don’t come from a single point of water intrusion. Condensation stains also look blotchy and may smell musty, and they won’t be concentrated in a single area on your ceiling.

Black mold on wood is a very serious issue. Besides compromising the structural integrity of the wood, it poses significant health risks. Stachybotrys chartarum, commonly known as toxic black mold, produces mycotoxins that can lead to respiratory issues, allergies, skin irritations, and other health problems. If left untreated, it can spread rapidly and compromise the structural stability of the affected wooden structures. Immediate remediation and preventive measures are essential to mitigate the risks associated with black mold on wood.

The Walnut, CA homeowners’ guide to mold testing and remediation services

From average costs to expert advice, get all the answers you need to get your job done.

See all articles