National Underground Group Employee Directory

Q: How many employees does National Underground Group have currently?

National Underground Group has approximately 53 employees.

ConstructionCalifornia, United States51-200 Employees

Since 1947, National Underground Group, formerly known as Hoffman Southwest Corp., has provided a full spectrum of services to maintain healthy underground infrastructures. Today, through our family of businesses, Pro-Pipe, Tri-State Utilities, Accumark, Pipe Vision and Benchmark, National Underground Group is focused on providing underground infrastructure solutions to municipalities, utilities, government agencies, construction companies and engineering firms throughout the U.S.

Find National Underground Group employees' phone numbers or email addresses

National Underground Group Global Highlights

North America
64

United States Of America
64

Europe
3

United Kingdom Of Great Britain And Northern Ireland
2
Germany
1

National Underground Group's Leadership

D. H.
Vice President Of Risk
Mobile Phone
Email
Z. L.
Vice President And General Manager
Mobile Phone
Email
C. M.
Small Business Owner
Mobile Phone
Email
N. M.
Owner-Operator
Mobile Phone
Email
M. R.
Director Of Business Development
Mobile Phone
Email
C. S.
Director Of Information Technology
Mobile Phone
Email
J. L.
Regional Director Southwest
Mobile Phone
Email
K. J.
Human Resources Director
Mobile Phone
Email

National Underground Group Employee Metrics

100%

50%

2026

2025

Program & Project Management
Administrative
Civil Engineering & Construction
Consultant
Healthcare Services
Other

Contact profiles from National Underground Group

Name

Title

Contact Info

Location

Last Update

C. M.
Small Business Owner
Mobile Phone
Email
Apr 25, 2025
N. M.
Owner-Operator
Mobile Phone
Email
Apr 23, 2025
D. H.
Vice President Of Risk
Mobile Phone
Email
United StatesVirginia
Jan 27, 2026
Z. L.
Vice President And General Manager
Mobile Phone
Email
Jul 30, 2024
M. R.
Director Of Business Development
Mobile Phone
Email
Dec 03, 2025
C. S.
Director Of Information Technology
Mobile Phone
Email
United StatesArizona
Feb 10, 2026
J. L.
Regional Director Southwest
Mobile Phone
Email
United StatesArizona
Jan 06, 2025
K. J.
Human Resources Director
Mobile Phone
Email
United StatesArizona
Feb 23, 2024
K. B.
Branch Manager, Proffesional Pipe Services
Mobile Phone
Email
Jan 28, 2026
D. H.
Manager
Mobile Phone
Email
United StatesTexas
Jun 10, 2025

Frequently Asked Questions

What is National Underground Group known for?

National Underground Group operates in the Construction industry. The company's main headquarters is located in 47 Discovery Suite 250 Irvine, California 92618 United States; you can contact the main corporate office by phone at

+1-949-380-****

. Explore National Underground Group's company overview page for more information.

What is National Underground Group's most common email format?

National Underground Group employees' email format typically follows the pattern of . Trying to find reliable and up-to-date employee contact data? Find more National Underground Group email formats with LeadIQ.

How many employees does National Underground Group have currently?

National Underground Group has approximately 53 employees as of February 2026. These team members are located across 2 continents, including North AmericaEurope.

Who are National Underground Group's key employees and leadership?

As of February 2026, National Underground Group's key employees include:

Vice President Of Risk: D. H.
Vice President And General Manager: Z. L.
Small Business Owner: C. M.
Owner-Operator: N. M.
Director Of Business Development: M. R.

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