How many email patterns does National Underground Group use?

National Underground Group uses 4 known email patterns.

What domain does National Underground Group use for work emails?

National Underground Group uses nationalu.com, hswcorp.com for work email addresses.

Most Common Email Formats at National Underground Group

National Underground Group's most common email format is First.Last@nationalu.com (ex. John.Doe@nationalu.com), used for 100% of nationalu.com addresses. National Underground Group uses 4 email patterns across 2 domains: nationalu.com and hswcorp.com. Percentages are the share of addresses within each domain.

@nationalu.com

1 pattern

Format	Example	Share of nationalu.com
First.Last@nationalu.comMost common	John.Doe@nationalu.com	100%

@hswcorp.com

3 patterns

Format	Example	Share of hswcorp.com
First.Last@hswcorp.comMost common	John.Doe@hswcorp.com	63%
FLast@hswcorp.com	JDoe@hswcorp.com	34%
FirstLast@hswcorp.com	JohnDoe@hswcorp.com	3%

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Frequently Asked Questions

What does National Underground Group do?

National Underground Group operates in the Construction industry, alongside similar companies like Michels Corporation, Primoris Services Corporation and MasTec. You can visit nationalu.com or contact National Underground Group's headquarters by phone at

+1-949-380-****

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

What is National Underground Group's email address format?

National Underground Group's email format typically follows the pattern of First.Last@nationalu.com; this email format is used 100% of the time. Other contacts within LeadIQ's database had email formats such as First.Last@hswcorp.com and FLast@hswcorp.com. Looking for more contact data? Unlock accurate emails and phone numbers from millions of profiles verified in real-time.

How many employees does National Underground Group have currently?

National Underground Group has approximately 50 employees as of October 2026. Key team members to contact include Vice President And General Manager: Z. L., Small Business Owner: C. M. and Owner-Operator: N. M. For more team information and contact data, explore National Underground Group's employee directory with LeadIQ.

National Underground Group Email Format

ConstructionCalifornia, United States11-50 Employees

National Underground Group is a construction-focused company dedicated to underground infrastructure. With roots dating back to 1947, it provides a full spectrum of services to maintain and upgrade underground networks and operates through a family of specialized brands including Pro-Pipe, Tri-State Utilities, Accumark, Pipe Vision, and Benchmark. Based in Irvine, California, the company serves municipalities, utilities, government agencies, construction firms, and engineering practices across the United States. It positions itself as an integrated solutions provider for planning, installation, maintenance, and modernization of underground systems. These activities place the company within the broader underground construction sector, serving a diverse set of public and private sector clients.

Most common format

First.Last@nationalu.com

Example: John.Doe@nationalu.com

4 patterns across 2 domains. See all formats

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Most Common Email Formats at National Underground Group

@nationalu.com

@hswcorp.com

Need a specific person's email?

Frequently Asked Questions

What does National Underground Group do?

What is National Underground Group's email address format?

How many employees does National Underground Group have currently?

National Underground Group Email Format

Ready to create more pipeline?

Everything for prospecting,in one platform.

What you can expect from LeadIQ:

Ready to create more pipeline?

Everything for prospecting,
in one platform.