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Water Quality: Physicochemical Indicators

The San Juan Bay Estuary Water Quality Monitoring Program is responsible for ensuring the water quality of the San Juan Bay Estuary through the physicochemical characterization of its water bodies. This assessment is carried out through the monthly quantification and measurement of parameters using environmental indicators. These indicators, in turn, allow us to collect data and perform various analyses that provide insight into the conditions of the ecosystems within these water bodies. The program is an essential component of the San Juan Bay Estuary Program (PEBSJ) because it enables the study of the impact of activities implemented through the PEBSJ's Comprehensive Management and Conservation Plan on the water bodies of the San Juan Bay Estuary.

The EBSJ Water Quality Monitoring Program has the following main objectives:

  • Determine the current condition of the Estuary and how it changes over time.
  • Identify and correct sources of contamination.
  • Raise a red flag if any contaminant is observed and thus notify the relevant agencies.
  • Generate a database for studies and publications.
  • Education and training of volunteers in environmental monitoring techniques.

During monthly monitoring, data on eight physicochemical parameters are collected using field instruments: temperature, dissolved oxygen, turbidity, pH, transparency, specific conductivity, salinity, and saturated dissolved oxygen. Some of these parameters have target values, which indicate whether the data collected that day meet the PESBJ water quality standards. Twice a year, water samples will be taken from each station for laboratory testing. These tests include 11 new water quality parameters that will help us develop a more in-depth analysis of the current water quality status of the EBSJ.

The San Juan Bay Water Quality Monitoring Program (EBSJ) established 25 monitoring stations across the EBSJ watershed, covering 14 water bodies, including rivers, streams, estuarine channels, lagoons, and the bay. Data is collected one week per month. Field trips were designed to maximize work time over four days; therefore, the stations are grouped by monitoring day into four categories: Piedras River stations, San Juan Bay stations, San José and Torrecillas Lagoon stations, and land stations.

The San Juan Bay Estuary is a 501c3 non-profit corporation that designs, implements, and monitors restoration actions to improve water quality and associated ecosystems within the San Juan Bay Estuary system and its watershed. 

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1315 Ponce de León Avenue, San Juan, PR 00907 

(787) 725-8165

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