A Multi-Service Quality Contractor

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STX Underground

A multi-service quality contractor

At STX Underground, we focus on being a comprehensive company committed to offering complete solutions for clients of all sizes.

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Our Location

402 W Hi-line Rd Ste A Pharr, TX 78577

Excellence in Services

We consistently provide services, ensuring professionalism and efficiency are upheld to the highest standards.

About Us

Tailored Solutions to fit Your Needs

At STX Underground, we emphasize being a company that offers complete services, focusing on providing turnkey solutions for clients of all sizes.

With over 30 years of combined experience, we handle projects of any size. Located in the Rio Grande Valley, we proudly serve South Texas with a strong emphasis on safety, quality, and efficiency.

30+ Years of Combined Experiance
why choose us

We offer experience and our commitment to quality.

Choosing STX Underground means partnering with a team focused on excellence in every project. With over 30 years of combined industry experience, we ensure each project, no matter the size, receives professional and expert handling. We employ advanced technology and high-quality equipment to deliver dependable, efficient solutions customized to meet each client’s unique needs.


Delivering Services to Power Your Success


Telecom and Utility Services

Offering solutions for telecommunications and utility needs, including splicing & testing capabilities, OSP services, and directional drilling.

Operations and Automation

Warehouse Solutions

Providing integrated warehouse solutions to streamline processes and enhance operational efficiency.

Durable Repairs

Labor Services

Specializing in engineered repairs to improve pressure boundary repair, extend the life of structures, and enhance corrosion resistance.

Industrial and construction

Excavation Solutions

Offering cost-effective excavation solutions with a team of qualified operators, ensuring the most suitable option for any project.

Custom Design Services

Design Builds

Our professionals offer design-build services in audio/visual, data centers, electronic security, structured cabling, and internet infrastructure to sustain and upgrade our clients’ systems.

Fiber Installation

Fiber Pulling

Our employees have undergone numerous training sessions to ensure that our fiber pulling is done to the highest standards, protecting the integrity of the fiber cable.

frequently asked questions

Common Questions About STX

At STX Underground, we recognize that clients may have inquiries about our services and processes. To provide clarity on what we offer and how we operate, we’ve prepared a list of commonly asked questions. If you have further inquiries, please feel free to reach out to us.

We serve all of South Texas, including the Rio Grande Valley (RGV) and surrounding areas, handling projects across state, municipal, and private sectors with our capable team.

Safety is our utmost priority. We follow rigorous safety protocols and provide ongoing training to our team, maintaining the highest safety standards on every project. Our dedication to safety ensures top-quality outcomes while safeguarding our team and clients alike.

Certainly. We specialize in crafting customized solutions to meet the specific needs of each project. Whether you require telecom services, warehouse solutions, or any of our other offerings, we collaborate closely with you to achieve the optimal result.

showcasing our expertise

Latest Projects


Brownsville Tx US Port of Entry Project


Dirt of Pharr TX Fiber Project

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Deep-Sea Mining Exploration coal cave

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Dedicated to excellence, safety, innovation, and client-focused infrastructure solutions.

contact us

have anything to ask ? ask us anything as you like

Have questions or ready to discuss your project? Reach out to us today. Our team is here to provide you with the information you need and to offer expert guidance on your next infrastructure endeavor.




402 W Hi-line Rd Ste A Pharr, TX 78577

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STX Underground

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At STX Underground, we strive to be a versatile company dedicated to delivering end-to-end solutions for clients of varying scales.