Is there an RFID tag that can identify water piping located 3 or 4 feet underground?
Yes. Berntsen makes a product called InfraMarker, which is designed for precisely this application. Here are a few articles we have written about this solution:
•Utility Company Uses RFID to Identify Underground Pipes, Wires
•InfraMarker Adds GPS, Cloud Services to Manage Buried Assets
You can watch videos that the company presented at past RFID Journal LIVE! events here: Most Innovative Use of RFID, Award Finalist for Best Use of RFID to Enhance a Product or Service: Berntsen International and RFID Infrastructure Marking for a Connected World.
A decade ago, 3M also introduced a system for tracking underground pipes (see 3M Upgrades Dynatel Locators), but I do not know if they are still selling it.
—Mark Roberti, Founder and Editor, RFID Journal
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