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Insights

Acquisition Opportunity CSC has been acquired by J.S. Held as of May 12, 2026, signaling expanded resources, cross-selling potential, and access to a broader client base across industrial hygiene, environmental engineering, health and safety, and regulatory compliance services.

National Footprint With multiple office locations nationwide (Los Angeles, San Francisco, Long Beach, Phoenix, San Diego) and a stated capability to serve the entire United States, there is potential to upsell national-scale projects, standardized IAQ/IH programs, and cross-region regulatory support.

Regulatory Expertise CSC specializes in IAQ/IEQ, environmental chemistry, soils and groundwater, and complex regulatory compliance, positioning opportunities to win multi-site Phase I/II assessments, remediation oversight, and litigation support through J.S. Held channels.

24/7 Response Emergency and on-call responsiveness (24/7) is a strong differentiator that can be leveraged to source fast-turnaround environmental investigations, mold/ASBESTOS incidents, hazardous exposure events, and urgent remediation projects for property managers and insurers.

Targeted Industries Current client mix includes property managers, insurance companies, hospitals, schools, universities, attorneys, and construction firms, indicating cross-sell opportunities into real estate portfolios, risk management programs, and institutional facilities requiring IAQ/IP safety and regulatory compliance services.

Similar companies to Clark Seif Clark, Inc. (CSC), a part of J.S. Held

Clark Seif Clark, Inc. (CSC), a part of J.S. Held Tech Stack

Clark Seif Clark, Inc. (CSC), a part of J.S. Held uses 8 technology products and services including Linkedin Insight Tag, iCIMS, WordPress, and more. Explore Clark Seif Clark, Inc. (CSC), a part of J.S. Held's tech stack below.

Clark Seif Clark, Inc. (CSC), a part of J.S. Held's Email Address Formats

Clark Seif Clark, Inc. (CSC), a part of J.S. Held uses at least 4 email formats:
Clark Seif Clark, Inc. (CSC), a part of J.S. Held Email FormatsExamplePercentage
FLast@csceng.comJDoe@csceng.com
65%
FirstLast@csceng.comJohnDoe@csceng.com
19%
Last@csceng.comDoe@csceng.com
11%
First@csceng.comJohn@csceng.com
5%

Frequently Asked Questions

What is Clark Seif Clark, Inc. (CSC), a part of J.S. Held's phone number?

Minus sign iconPlus sign icon You can contact Clark Seif Clark, Inc. (CSC), a part of J.S. Held's main corporate office by phone at
+1-480-460-****
. For more prospecting data, LeadIQ has access to up-to-date and accurate contact information within our platform. Find, capture, and sync contact data to your CRM and sales tools in one click.

What is Clark Seif Clark, Inc. (CSC), a part of J.S. Held's official website and social media links?

Minus sign iconPlus sign iconClark Seif Clark, Inc. (CSC), a part of J.S. Held's official website is csceng.com and has social profiles on LinkedIn.

How much revenue does Clark Seif Clark, Inc. (CSC), a part of J.S. Held generate?

Minus sign iconPlus sign icon As of August 2026, Clark Seif Clark, Inc. (CSC), a part of J.S. Held's annual revenue is estimated to be $25M - $50M.

What is Clark Seif Clark, Inc. (CSC), a part of J.S. Held's SIC code and NAICS code?

Minus sign iconPlus sign iconClark Seif Clark, Inc. (CSC), a part of J.S. Held's SIC code is 8734 - Testing Laboratories and NAICS code is 54162 - Environmental Consulting Services.

How many employees does Clark Seif Clark, Inc. (CSC), a part of J.S. Held have currently?

Minus sign iconPlus sign iconAs of August 2026, Clark Seif Clark, Inc. (CSC), a part of J.S. Held has approximately 29 employees across 1 continents, including North America. Key team members include Manager: T. K. and Environmental Consultant: N. H. Explore Clark Seif Clark, Inc. (CSC), a part of J.S. Held's employee directory with LeadIQ.

What industry does Clark Seif Clark, Inc. (CSC), a part of J.S. Held belong to?

Minus sign iconPlus sign iconClark Seif Clark, Inc. (CSC), a part of J.S. Held operates in the Environmental Services industry.

What technology does Clark Seif Clark, Inc. (CSC), a part of J.S. Held use?

Minus sign iconPlus sign iconClark Seif Clark, Inc. (CSC), a part of J.S. Held's tech stack includes Linkedin Insight Tag, iCIMS, WordPress, Microsoft 365, Google Cloud, Constant Contact, HubSpot and Marketo.

What is Clark Seif Clark, Inc. (CSC), a part of J.S. Held's email format?

Minus sign iconPlus sign iconClark Seif Clark, Inc. (CSC), a part of J.S. Held's email format typically follows the pattern of FLast@csceng.com. Find more Clark Seif Clark, Inc. (CSC), a part of J.S. Held email formats with LeadIQ.

When was Clark Seif Clark, Inc. (CSC), a part of J.S. Held founded?

Minus sign iconPlus sign iconClark Seif Clark, Inc. (CSC), a part of J.S. Held was founded in 1996.
Clark Seif Clark, Inc. (CSC), a part of J.S. Held logo

Clark Seif Clark, Inc. (CSC), a part of J.S. Held

Environmental ServicesCalifornia, United States11-50 Employees

Clark Seif Clark, Inc. (CSC) is an environmental services firm whose work centers on environmental consulting and industrial hygiene, with particular emphasis on indoor environmental quality and the regulatory aspects of soils and groundwater. Its services cover investigations, project monitoring, remediation closure testing, bid management, litigation support, and expert testimony for a diverse client base. Based in Chatsworth, Southern California, CSC serves clients nationwide and operates multiple offices, offering around-the-clock response for scheduled or emergency engagements.

Its expertise spans a broad set of environmental concerns, including asbestos, mold, mercury, lead-based paint, and other hazards, and it serves property managers, insurers, hospitals, schools and universities, attorneys, construction firms, and state or municipal agencies. In May 2026, CSC was acquired by J.S. Held, situating its environmental consulting and industrial hygiene capabilities within the broader platform of the acquiring firm.

Section iconCompany Overview

Phone number
+1-480-460-****
Website
csceng.com
SIC Code
8734 - Testing Laboratories
NAICS Code
54162 - Environmental Consulting Services
Founded
1996
Employees
11-50

Section iconMedia & News

Section iconFunding & Financials

  • $25M - $50M

    Clark Seif Clark, Inc. (CSC), a part of J.S. Held's revenue is estimated to be in the range of $25M - $50M

Company Leadership

  • Manager at Clark Seif Clark, Inc. (CSC), a part of J.S. Held
    T. K.
    Manager
    Mobile Phone
  • Environmental Consultant at Clark Seif Clark, Inc. (CSC), a part of J.S. Held
    N. H.
    Environmental Consultant
    Mobile Phone

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