Probabilistic Monitoring

James River

What is Probabilistic Monitoring?

ProbMon Handouts

ProbMon Reports

ProbMon Presentations

ProbMon Posters

 

 

What is Probabilistic Monitoring?

Probabilistic monitoring (ProbMon) is the sampling of randomly selected stations. These monitoring stations are generated by a computer program that randomly chooses monitoring sites on rivers and streams throughout Virginia. Water quality monitoring stations in Virginia are typically located at bridges. These monitoring stations are known as targeted monitoring sites.

Targeted monitoring has utility for monitoring regulatory compliance of pollution sources, identifying impaired waters, and for tracking local pollution events. However, it is not appropriate to extrapolate results from targeted stations to unsampled watersheds over large geographic areas. Data to answer such questions are best obtained from sample locations chosen so that all streams have an equal chance of being sampled. Consequently, to answer the question 'How good is the water quality in Virginia?', a new more comprehensive data set was needed.

In order to address statewide and regional questions about water quality, the Virginia Department of Environmental of Quality (VDEQ) added probabilistic monitoring networks to its estuarine monitoring program in 2000 and its freshwater monitoring program in 2001. This website focuses on the freshwater program. The aim of ProbMon is to provide accurate statewide and regional assessments of the chemical, physical, and biological conditions of Virginia's freshwater resources.

ProbMon Handouts

ProbMon Reports

ProbMon Presentations

ProbMon Posters

 

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Virginia Department of
Environmental Quality
P.O. Box 1105
Richmond, VA 23218
(804) 698-4000


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