rules can be found on the TNRCC WWW site, which is at http://www.tnrcc.state.tx.us. TNRCC to Offer Series of Free Workshops to Discuss New Rules. The Texas Natural Resource Conservation Commission (TNRCC) is presenting a series. of free, half-day workshops concerning the new agency rules regulating OSSF systems. The workshops will provide a broad overview of how the new rules will affect local. permitting agencies, system designers, installers, and the public.