The leading source of pollutants found in rivers surveyed for the 1998 report that you read was; Agriculture.
The National Water Quality Inventory Report to Congress in 1998 was one that summarized information reported by the states in that same year by describing the condition of their waters that were accessed as it was required under Section 305(b) of the Clean Water Act.
The report had many sections such as;
Monitoring and Assessment
- Rivers and Streams
- Lakes, Ponds, and Reservoirs
- Coastal Resources - Tidal Estuaries, Shoreline Waters, and Coral Reefs
- Wetlands
- Ground Water Quality
- Public Health and Aquatic Life concerns
- Costs and Benefits of Water Quality Protection
Now, from the report as seen online, it was discovered that the leading source of pollutants found in rivers is Agriculture.
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