| TESS is a one-call notification center for Texas – the largest one-call center in the US. TESS is managed by our Board of Directors, elected by our members. Our center is powered by GeoCall®, the state-of-the-art one-call system developed by Progressive Partnering (P2). GeoCall®, is a fully integrated GIS and one-call system. DIG TESS eliminates unnecessary locate requests, saving our members money and increasing the value of TESS membership. Joining TESS is a cost-effective way to prevent damage to vital buried lines. Did you know...Locate requests are good for 14 working days from origination (when working around gas lines)?* And... If a gas line is damaged, it must be reported to the one-call center immediately and to the Railroad Commission within 10 working days (or you may be subject to fines)?* *Texas Administrative Code (TAC) Title 16, Part 1, Chapter 18 | 