A-1 Certified Environmental Services

What They Do

Mold TestingLead Paint

• Mold sampling
• Air Conditioning
• Air Duct Cleaning
• Air Sampling
• Air Scrubber Rental
• Allergen Testing
• Bacteria Testing
• Bacteria Testing Services
• Black Mold Testing
• Certified Mold Inspector
• Certified Mold Testing
• Chemical Testing
• Commercial Building
• Commercial Property
• Covid-19 Surface Testing
• Day Inspection
• Doors And Windows
• Dryer Vents Cleaning
• Dust Testing
• Electromagnetic Field Testing
• Emergency Inspection
• Environmental Testing
• Environmental Testing Service
• Fire Damage Restoration
• Flood Remediation
• Formaldehyde Testing
• Healthy Home Inspection
• Heating And Cooling

Compare Them With Others in South San Francisco

• All 6 mold inspection and testing companies in South San Francisco

In Their Own Words

At Certified Environmental Services, we offer you optimum mold testing. The quality of the air of your home or your business needs to be as pure as possible. Mold can cause lots of health issues. A proper test will confirm if there is or isn’t mold in your home. Mold remediation is definitely a costly service but it is necessary to avoid worse consequences. Only a mold test can let you know how pure the quality of air is. Our test will give you real and honest results. Our services include tests for homes and businesses. We can carry out a variety of tests. There are many reasons you can decide to make a mold test such as an unusual odor, buying a new home, selling homes, renting homes, and many other situations.

Written by the business on its public profile. We have not verified these claims.

Before You Call A-1 Certified Environmental Services

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. Is your firm certified under the federal lead renovation rule?
4. Will you set up containment and do cleaning verification at the end?

Ask for the company’s California contractor license number and look it up with the Contractors State License Board. Also ask for proof of insurance and industry certification for the technicians doing the drying or mold work.

They list no storefront. Ask where the business is based and whether the crew is their own.

How Their Reviews Break Down

Counts from public listings as of September 23, 2026. A handful of reviews says less than a few hundred.

Read This While You Wait

• 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 careLead Paint in Homes Built Before 1978What lead paint means in a home built before 1978. Who is most at risk, how to test, what the EPA RRP rule requires, and which practices are banned.
• 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.
• DIY with careLead Paint Testing and Inspection CostTypical lead paint testing costs, from DIY swab kits to XRF inspections and risk assessments, plus dust and soil sampling and who to hire for repairs.