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Eyes on the Bay - Status and Trends

Status and Trends information is calculated from data collected as part of our Chesapeake Bay Water and Habitat Quality Monitoring Program. A detailed description of our water quality status and trends methods and parameters can be found on our Status and Trends Methods page.
  •Status: measure of current condition (2017-2020) at a station based on scientifically-based threshold values determined for tidal water quality based on the salinity zone; non-tidal water quality is not assessed for current condition. Based on this comparison, the station is given a ranking of "good," "fair," or "poor."
  •Trend: measure of how the system has been changing over time, either improving or degrading. Trends are flow-adjusted, and represent data from 1999 to 2020.

To view detailed reports on the health of Chesapeake Bay tributaries, visit our Tributary Water Quality and Habitat Assessments page. Results for Maryland's non-tidal station trend analysis can be viewed in our Summary of CORE/Trend Results through 2019.

Eyes on the Bay - Interactive Mapping of Current Year Long-Term Station Data
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Status:
Good
Fair
Poor
Trends:
Improving
No Trend (no symbol on combined status & trends map)
Degrading

Status is a measure of current condition (2014-2016) at a station compared either to scientifically-based benchmark values or to a benchmark dataset. Based on this comparison, the station is given a ranking of "GOOD", "FAIR", or "POOR" .

Trends are a measure of how the system has been changing over time, either improving or degrading. Trends shown here represent data from 2007 to 2016.

Detailed Methods for Status and Trend Calculations

*All metrics are annual measures, except for dissolved oxygen which is only during Summer months.

Change Parameters
 

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