Three permanent water quality monitoring stations are used to track water quality and are managed by the Guadalupe-Blanco River Authority (GBRA) through grant funding from the Texas State Soil & Water Conservation Board (TSSWCB).

Due to increased discharge from wastewater treatment plants, Plum Creek now flows year-round over most of its length. USGS gages at U.S. Highway 183 near Lockhart and at Caldwell County Road 131/Biggs Road near Luling monitor Plum Creek streamflows.

GBRA’s Water Quality Sampling & Data

Currently, routine ambient water quality data is collected monthly at 2 main stem stations by GBRA (#17406 and #12640) and quarterly at a third main stem station by the Texas Commission of Environmental Quality (TCEQ). The monitoring project, funded by US Environmental Protection Agency, through a grant from the Texas State Soil and Water Conservation Board (TSSWCB), will generate data of known and acceptable quality for surface water quality monitoring of main stem and tributary stations on Segment 1810, Plum Creek, for field, conventional, flow, bacteria and effluent parameters to support the development of a Watershed Protection Plan for the watershed. Monitoring includes:

• Routine ambient monitoring at 5 sites monthly, and one site quarterly over 15 months.
• Targeted monitoring at 35 sites twice per season, once under dry weather conditions and once under wet weather conditions each season, for four seasons.
• Automated stormflow monitoring at on urban/residential site during a minimum of four storm events.
• 24-hour dissolved oxygen monitoring at 8 sites monthly during the index period.
• Effluent monitoring of six wastewater treatment facilities, City of Lockhart plants(2), City of Luling, City of Buda, City of Kyle and Shadow Creek.
• Springflow monitoring at three springs.

Plum Creek Watershed and TCEQ Wastewater Outfalls and GBRA Water Quality Monitoring Sites
(Updated September 2021)

Related Information

• Plum Creek Watershed Data Report (Texas Stream Team)
• Plum Creek Monitoring Project Plan (funded by TSSWCB)
• Water Quality Monitoring Project Quality Assurance Protection Plan

Map of Sampling Sites

Using the map below, click on a station to get information on the location and a link to the current data collected at the site.

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Sampling Type	Data
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List of Sampling Sites

Using the list below, click on a link in the Data column to get the current data collected at the site.