Clark Seif Clark, Inc. (CSC)

What They Do

MoldMold TestingFire and SmokeBiohazardAsbestosLead Paint

• Brownfields & voluntary remediation
• Ccr & electric utilities
• Clean air act services
• Environmental due diligence
• Federal government services
• Hazardous waste & superfund
• Renewable natural gas & energy systems
• Storage tanks & spill prevention
• Water quality monitoring
• Cleaning & Restoration
• Debris Cleanup
• Hazardous Building Material Surveys
• Hearing Conservation Program
• Legal Support
• OSHA-compliance consulting
• Phase I Environmental Assessments
• Phase II subsurface sampling
• arsenic contamination analysis
• asbestos testing
• biohazard assessments
• chromium contamination analysis
• emergency support consultation
• engineering litigation support
• environmental assessments and consulting
• environmental consultation
• hazardous materials abatement planning
• health and safety surveys
• indoor air quality assessments

In Their Own Words

Clark Seif Clark, Inc. (CSC) is your trusted partner for comprehensive environmental consultation and testing in Chatsworth, CA. Established in 1996, CSC excels in engineering litigation support, moisture mapping services, and professional moisture mapping services, ensuring precise solutions for environmental challenges. Our expert team provides environmental assessments and consulting, focusing on industrial lead paint, mold clearance testing, and asbestos testing to protect your assets and people. Enhance indoor air quality with our specialized testing services. Choose CSC for a reliable, expert-led approach to environmental health and safety. Contact us today for tailored solutions.

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

Before You Call Clark Seif Clark, Inc. (CSC)

1. Where do you think the moisture is coming from, and who fixes it?
2. Will you set up containment and negative air, and how will you protect the rest of the home?
3. Do you also do remediation? If so, who checks your work?
4. How many air samples will you take, and will you take an outdoor control sample?
5. How will you deal with smoke odor inside wall cavities and the HVAC ducts?

California requires a state contractor license for most repair jobs over $1,000. Ask for the number and check it with the Contractors State License Board.

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

• DIY with careSafe DIY Mold Cleanup for Areas Under 10 Square FeetA step by step method to clean up mold under 10 square feet safely, with the gear to buy, what to throw away, why bleach is not the default, and when to stop.
• 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.
• Call a proThe First 48 Hours After a House FireWhat to do in the first two days after a house fire. Safe re-entry, utilities, insurance calls, securing the home, food, medicine and what never to clean.
• Call a proTrauma and Unattended Death Cleanup, What Families Should KnowA gentle guide for families after a death or injury at home. What you do not have to do yourself, how cleanup works, who pays, and how to choose a crew.