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The USGS New Jersey Water Science Center, in cooperation with the NJ Department of Environmental Protection (NJDEP), New Jersey Water Supply Authority, and the Delaware River Basin Commission, maintain the New Jersey Ambient Surface-Water-Quality Monitoring Network (ASWQMN) — a collection of monitoring stations on streams throughout New Jersey. Constituent concentration data from the ASWQMN are used to determine statewide water-quality status and trends, define the quality of water in streams near the downstream end of each NJDEP Watershed Management Area (WMA), define background water quality in each of the four physiographic provinces of New Jersey, and define the quality of water in streams that drain targeted land-use areas. The ASWQMN consists of as many as 126 stations located throughout the 20 WMAs in New Jersey.
The Federal Clean Water Act and Section 106 of the U.S. Environmental Protection Agency’s Water Pollution Control Grants mandate that states monitor the quality of their ambient waters. In order to meet these requirements, the cooperative Ambient Surface-Water-Quality Monitoring Network (ASWQMN) was established in 1976 to determine the status of and trends in the quality of water in New Jersey’s freshwater streams and rivers. As part of this network, the U.S. Geological Survey (USGS) New Jersey Water Science Center and the New Jersey Department of Environmental Protection (NJDEP), in cooperation with the New Jersey Water Supply Authority and the Delaware River Basin Commission, collect water samples quarterly and streambed-sediment samples annually at surface-water-monitoring stations throughout New Jersey.
The ASWQMN provides surface-water-quality information to facilitate the effective planning and management of New Jersey’s water resources and provides water-quality information to the public. The data obtained are used to:
The ASWQMN consists of summaries of 126 surface-water-quality monitoring sites including 76 fixed and 50 periodic sites statewide, which are sampled quarterly. The locations of the fixed sites do not change over time and fall into three categories—land-use indicator, watershed integrator, and background sites. Fifty new sites are randomly selected every 2 years for sampling to ensure a statistically valid statewide assessment.
ASWQMN Site Types
The fixed, long-term sites determine status and trends of ambient water-quality of surface waters in the State of NJ. General objectives of the Fixed sites include:
The periodic component of the ASWQMN allows for a comprehensive statistical evaluation of statewide water quality by routinely changing the sites that are included as a subset of the ASWQMN. This subset of sites provides data from a set of randomly selected sites to assess water quality statewide (1998-2011) or provides data from a set of selected sites in priority regions, basins, and/or watersheds (2011 - present).
What is Collected?
Below are other science projects associated with this project.
Below are data or web applications associated with this project.
At selected surface-water and ground-water sites, the USGS maintains instruments that continuously record physical and chemical characteristics of the water including pH, specific conductance, temperature, dissolved oxygen, turbidity, and percent dissolved-oxygen saturation. At sites where this information is transmitted automatically, data are available from the real-time data system.
Below are publications associated with this project.
National Water Information System Web Mapper (NWISWeb Mapper) Provides access to water-resources data collected throughout the state of New Jersey as presented in the form of an interactive map.
Routine constituents are collected during sampling cycles at both fixed and probabilistic sites, and presented in tables provided.
Below are partners associated with this project.