Insights

Acquisition synergy CSC recently became part of J.S. Held, signaling potential cross-sell opportunities across broader environmental consulting services, industrial hygiene, and regulatory compliance with an expanded client network.

National footprint With multiple U.S. office locations and a nationwide service capability, there is a strong opening to propose nationwide environmental due diligence, IAQ monitoring, and regulatory support for multi-site real estate portfolios.

Diverse regulatory needs CSC’s expertise spans asbestos, mold, lead paint, mercury, radon, and other environmental health concerns, creating opportunities to bundle Phase I/II assessments, remediation oversight, and litigation support for complex risk management.

Emergency responsiveness 24/7 availability for investigations and monitoring positions CSC as a preferred partner for urgent IAQ events, contamination incidents, or emergency remediation projects that require rapid regulatory coordination.

Industry exposure Existing client base includes property managers, hospitals, schools, and insurers, suggesting recurring revenue potential through ongoing IH services, environmental compliance programs, and preventive testing contracts.

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 Cloudflare DNS, Lodash, OWL Carousel, and more. Explore Clark Seif Clark, Inc. (CSC), a part of J.S. Held's tech stack below.

  • Cloudflare DNS
    Domain Name Services
  • Lodash
    Javascript Libraries
  • OWL Carousel
    Javascript Libraries
  • HubSpot
    Marketing Automation
  • PWA
    Miscellaneous
  • Facebook Share Button
    Miscellaneous
  • UltimatelySocial
    Social Sharing
  • Flat UI
    UI Frameworks

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 1 format(s):
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?

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You can contact Clark Seif Clark, Inc. (CSC), a part of J.S. Held's main corporate office by phone at . 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?

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Clark 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?

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As of July 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 NAICS code?

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

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

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As of July 2026, Clark Seif Clark, Inc. (CSC), a part of J.S. Held has approximately 30 employees across 1 continents, including North America. Key team members include Manager: T. K.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?

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Clark 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?

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Clark Seif Clark, Inc. (CSC), a part of J.S. Held's tech stack includes Cloudflare DNSLodashOWL CarouselHubSpotPWAFacebook Share ButtonUltimatelySocialFlat UI.

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

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Clark 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?

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Clark 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
Website
csceng.com
SIC Code
8734 - Testing Laboratories
NAICS Code
54162 - Environmental Consulting Services
Founded
1996
Employees
11-50

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

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

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