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Watershed Monitoring

Trend Network Report Card

Welcome to the Watershed Monitoring Section (WMS) Trend Network Report Card. This tool displays maps that show trends in surface and ground water for the period 1999-2012. Surface water sites are located in rivers, streams, and canals. Ground water sites are located in unconfined and confined aquifers.

To use the tool, select a resource in "Step 1" to view the sampling locations for either surface or ground water. To view results, select an indicator in "Step 2" from the drop-down lists and click "Submit". A map of the results, and an explanation of the map features will display below.

Step 1: Select a Water Resource Type Step 2: Select a Water Quality Indicator Related Links

Map of All Trend Stations

Understanding the Maps

  • Upward arrows - sites with an increasing trend for the selected indicator
  • Downward arrows - sites with a decreasing trend for the selected indicator
  • Circles - sites with no significant trend for the indicator
  • Asterisks - sites where there are not enough data to determine a trend
  • Surface Water Maps
    • Dark blue symbols - data from flow adjusted sites that are associated with a USGS gauging station (We can accommodate the effect of quantity on quality (chemical constituents are typically diluted by flow) by incorporating flow weighting in our analyses of trend.)
    • Gray symbols - data from non-flow adjusted sites.
  • Ground Water Maps
    • Dark blue symbols - data from unconfined aquifer sites (Unconfined aquifers are more vulnerable to surface pollution sources than confined aquifers which are protected by a confining unit impeding downward infiltration from the surface.)
    • Gray symbols - data from confined aquifer sites

What do we mean by an "increasing" or "decreasing" trend?

For instance in surface waters, increasing trends in dissolved oxygen indicate an improved water quality condition (i.e. higher levels of oxygen support increased biodiversity in aquatic communities). In contrast, increasing trends of fecal coliforms in either surface or ground water may indicate impacts from human activities.

A decreasing trend in the depth to water within ground water wells generally indicates a decline in the availability of the ground water resource. An indication of no trend for pH in ground water may indicate more stable conditions versus an upward trend of pH indicating conditions of unfavorable change.

Increasing trends in alkalinity, calcium, chloride, chlorophyll a, nitrate-nitrite, orthophosphorus, total phosphorus, potassium, sodium, specific conductance, sulfate, total dissolved solids, or total organic carbon generally indicate a decline of water quality and conditions unfavorable to maintain animal and plant diversity. For more in depth information on the WMS Trend Network, including descriptions of the water resources, please visit the Trend Network web page.

Last updated: June 25, 2014