TR-522 Attoyac Bayou Watershed Protection Plan – On-site Sewage Facility Remediation

Authors: Emily Monroe, Lucas Gregory, Jeremiah Poling, Ken Awtrey

From October 2017 through February 2020, Texas Water Resources Institute (TWRI) implemented the “Attoyac Bayou Watershed Protection Plan Implementation – On-Site Sewage Facility (OSSF) Remediation” project, Contract #582-17-70355, funded by a Clean Water Act Section 319(h) Nonpoint Source Grant from the Texas Commission on Environmental Quality (TCEQ) through the U.S. Environmental Protection Agency. This project funded the repair, replacement and initial installment of OSSFs for 24 residences in the Attoyac Bayou Watershed from Nacogdoches, Rusk, San Augustine and Shelby counties. Remediating these systems impacted water quality by reducing potential bacteria and nutrient loads into nearby waterbodies. The E. coli load reduction to the watershed is estimated to be 1.245E+14 cfu/100 mL. The daily potential total nitrogen (TN) load reduction is estimated to be 54.06 g TN/day. The daily potential total phosphorus (TP) load reduction is estimated to be 62.04 g TP/day. The total suspended solids (TSS) load reduction is estimated to be 2,507.45 g TSS/day. The potential 5-day biological oxygen demand (BOD5) load reduction is estimated to be 2,303 g BOD5/day. Additionally, the project recommended best management practices for OSSF data management to TCEQ and worked with Rusk County to develop a plan to digitize OSSF records.