Guardian Private Utility Locating Services locates private utilities using state-of-the-art equipment for all pre-excavation and site planning needs. The state one-call (811) only marks public utilities up to the service meter. Any utility beyond the service meter is usually considered private which will require a second call to Guardian Private Utility Locating. Some examples of private utilities are building to building utilities, fire and water mains, parking lot lighting, network fiber and sanitation sewers.