The U.S. Geological Survey provided information used in the following sections of the Heinz Center report: Water-quality data provided by the National Water-Quality Assessment (NAWQA) Program are stored in a central warehouse and are available to download via the Web. Detailed analytic methods and links to the final datasets can be found by selecting the appropriate link below.
| Streams | Stream Sediments | Freshwater Fish Tissue | Ground water | |
|---|---|---|---|---|
| Chapter 4--Core National Indicator--Chemical Contamination | Nitrate, (ammonia), pesticides | Organochlorine pesticides, Total PCB's, PAHs and other semivolatile organic compounds | Organochlorine pesticides, Total PCB's | Nitrate, Pesticides, VOC's, (trace elements) |
| Chapter 6--Farmlands | Nitrate, Phosphorus, and pesticides | Nitrate and pesticides | ||
| Chapter 7--Forests | Nitrate | |||
| Chapter 8--Freshwater Systems | Phosphorus | |||
| Chapter 10--Urban/Suburban Areas | Nitrate (ammonia), phosphorus, pesticides | Nitrate, Pesticides, VOC's, (trace elements) |
Note: constituents in parenthesis ( ) were used only for the preparation of the exceedance plots but not in the occurrence plots.
Detailed information on the occurrence and significance of nutrients and contaminants in the Nation's water resources is available on the National Water-Quality Assessment Web page. In addition to the data analyzed for this report, data collected as part of the NAWQA program but not included in this analysis and subsequent data collected from study units begun in 1997 are available from the NAWQA data warehouse.
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