MDR Utility Locating Specialists, Inc. is an underground utility locator specializing in damage and loss prevention.

With over 35 years of experience, we are trusted leaders who take pride in delivering high-quality utility locating, surveying, and mapping services to the greater California area.

Private Utility Locating Services

Our goal is to provide homeowners, contractors, excavators, site planners, engineers, and landscapers peace of mind. We strive to protect our customers from costly damage and the dangers associated with ground excavating. Let us make your project safe and worry free.

Public Utility Locating Services

MDR has identified and located subsurface utilities on numerous projects for Cities of Palo Alto, Mountain View, Visalia, Huron, Buttonwillow, Fresno, Oakland, San Francisco, and numerous California city school districts, colleges and universities.

We partner with you to create smarter designs and to develop a smarter approach to construction, while eliminating the costs and downtime associated with unexpected findings on a job site.

Subterranean Utility Engineering

MDR provides subsurface utility engineering (SUE) services to increase the understanding of underground utilities for project owners, utility owners, designers, engineers and contractors. We deliver accurate mapping information of existing underground utilities, allowing clients to make informed decisions, avoid costly conflicts or project delays, and eliminate risk.

811 Call Before You Dig

Call Before You Dig –

Call 811 at least a few days before you start any digging project. Whether you are planning to do it yourself or hire a professional you are required to inform all utility agencies that have a utility in the area so they can visit the site and mark their utility before excavation begins. It’s excavation law, section 4216 that mandates this process for everyone.

Surveying and Mapping

MDR Utility Locating Specialists, Inc. provides surveying and mapping services to guide projects from initial boundary research to map recording and from construction staking to inspection services.  No matter the circumstance, our surveyors work diligently to provide the precise information necessary to design and build your project.

All surveys are completed under the supervision of a licensed land surveyor experienced in the particular type of survey required. MDR utilizes GPS, robotic, and conventional total stations with electronic data collectors. All surveys and mapping meet National Map Accuracy Standards and other appropriate quality standards. MDR routinely provides MSHA and OSHA trained survey crews, depending upon the site specific requirements.

Public Utility & Private Agencies We’ve Worked With


We are committed to completing every project on time and to to the highest standards. We will help make certain your project gets done without interruption and that you have a clear and accurate picture of all underground utilities and cables before your project begins.

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