Clark Seif Clark, Inc. (CSC)

What They Do

Water DamageMoldMold TestingFire and SmokeSewageBiohazardAsbestosLead Paint

• Brownfields & voluntary remediation
• Environmental due diligence
• Federal government services
• Hazardous waste & superfund
• Storage tanks & spill prevention
• Water quality monitoring
• Asbestos testing
• Biohazard Surveys
• Cal/OSHA Lead Standards Guidance
• Cost-Effective Remediation Solutions
• Engineering Litigation Support
• Environmental Assessments and Consulting
• Environmental Compliance Consulting
• Environmental Site Assessments
• Fire Protection Plans
• Groundwater testing & remediation
• Hazardous Building Material Surveys
• Hazardous Material Assessment
• Hazardous Materials Abatement Planning
• Hazmat Technical Support
• Heavy Metals Testing Post-Wildfire
• II
• Indoor Air Quality Assessments
• Industrial Hygiene Services
• Lead-based paint
• Legal Support
• Legionella Monitoring
• Legionella disease bacteria

In Their Own Words

Clark Seif Clark, Inc. (CSC) is your premier environmental consulting firm in Southern California, offering top-tier services like engineering litigation support, environmental compliance consulting, and professional moisture mapping. Our expert team is dedicated to delivering comprehensive solutions—ranging from mold clearance testing and environmental assessments to soil, water quality, and smoke inspection services. Conveniently located at 4010 Watson Plaza Drive Suite 170, we cater to both private and public sector clients. Choose CSC for unmatched expertise in environmental testing services near you. Contact us today to ensure a safe and compliant environment.

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

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

1. Do you take moisture readings every day and will you give me the drying log?
2. Are your technicians certified in water damage restoration?
3. Where do you think the moisture is coming from, and who fixes it?
4. Will you set up containment and negative air, and how will you protect the rest of the home?
5. Do you also do remediation? If so, who checks your work?

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 careWhat to Do in the First 24 Hours After Water DamageAn hour by hour plan for the first day after water damage. Make it safe, stop the source, document, remove water and start drying before mold can start.
• 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.