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map of sampling sites


  Bureau of Freshwater & Biological Monitoring



Regional Targeted Water Quality Network(RTWQN) and Probabilistic Water Quality and Biological Network(PWQBN)




The Regional Targeted Water Quality Network (RTWQN) was established in 2014 as  a monitoring  network  that  focuses sampling efforts in designated water regions of the state.  For the years 2014 and 2015, the region of focus is the Raritan region.

Comprised of 12 stations per region, each site is sampled 10 times/year to achieve a comprehensive dataset. These samples are collected over a 2-year period before moving on to the next designated water region. The rotating water region approach results in a comprehensive assessment of the entire state every 10 years.

The RTWQN sample design  focuses on the collection of Conventional, Nutrients & Trace Metals parameters. Examples of sampled parameters include:

1. Field Readings such as Dissolved Oxygen, Temperature & pH.
2. Conventional/Nutrient parameters such as Nitrate & Nitrite, Ammonia and Alkalinity.
3. Metal Parameters (sampled 5 times/year) including Mercury,  Arsenic & Hexavalent Chromium.  
4. Stream Discharge Measurements (Flow)
5. Diurnal Dissolved Oxygen, pH and Temperature.


For additional information, please contact Alex Dinkel at 609-292-0427




The Probabilistic Water Quality and Biological Network was originally established in 2011, and consisted of 40 stations.  In 2013, 11 new stations were added to bring the total number of monitoring locations to 51.  Stations were selected probabilistically using a Generalized Random Tessellation Stratified (GRTS) survey design.  The purpose of this design is to enable for statistical estimates of water quality condition for statewide assessment.
Stations are sampled quarterly for a wide range of physical and conventional parameters are monitored in this program including field parameters such as pH, dissolved oxygen, specific conductance, water temperature, turbidity and laboratory parameters such as phosphorus and other nutrients. Trace metals samples are also collected twice a year at times selected to produce both dry and wet weather data. Discharge(Flow) measurements are made at each non-tidal station during each sampling event by Rivers and Streams Program staff or by staff from USGS’ New Jersey Water Science Center. In addition, macroinvertebrate and/or fish samples are collected at each station where possible.


For additional information, please contact Chris Kunz at 609-292-0427.





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Last Updated: January 16, 2018