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USGS IN YOUR STATE

USGS Water Science Centers are located in each state.

National Water Quality Assessment Program (NAWQA)

Hudson River Basin Study Unit - Cycle I (1993-1995) Sampling Networks

Network (number of sites), sampling frequency and period sampled

• Basic Fixed Sites (14 sites) sampled monthly, April 1993-March 1995
• Intensive Fixed Sites (3 sites) sampled weekly or monthly, April 1994-September 1995
• 2,4-d & Atrazine Survey (10 sites) sampled once in June 1993
• Low-flow water-quality & ecological synoptic (44 sites) sampled once, August 1993
• High-flow nutrient & sediment synoptic (44 sites) sampled once, April 1994
• Bed Sediment Survey (45 sites) sampled once, August 1992-August 1994
• Sewage Treatment Plant Samples (17 sites) sampled once or twice, July-August 1995
• Basic Fixed Site Ecological Assessment (8 sites) sampled once annually for three years
• Fish Tissue Survey (28 sites)
• Fish Community and Habitat Survey (9 sites) sampled once 1995
• Ecological Survey (31 sites) sampled once
• Ground Water Study-Unit Survey (50 wells) sampled once
• Ground Water Land-Use Survey (51 wells) sampled once
• Ground Water Flow-Path Study (18 wells, 4 tile drains, 4 drainage ditches) 4 sets of samples