Surface Water
Surface Water-Quality Trend Sites
Mercury Distribution in Water, Steambed Sediment, and Fish
Characterization of Community Water Supplies

Ground Water
Changes in Ground-Water Quality in Corn Crop Areas
Ground-Water Quality in Wheat Crop Areas
Ground-Water Quality in Areas of Recent Urbanization
Characteristics of Community Ground-Water Supplies
Biology
Effects of Urbanization on Stream Ecosystems

Surface Water
Surface Water-Quality Sites
Nutrients in Wastewater Discharges
Nutrients in Off-Stream Reservoirs
Pesticides in Surface Water During the Irrigation Season
Trace-Element Transport in Clear Creek and the South Platte River

Ground Water
Ground-Water Quality in the Denver Metropolitan Area
Ground-Water Quality in Mountainous Areas
Ground-Water Quality in the Plains

Biology
Biological and Habitat Conditions in the South Platte River Basin
Ecological Synoptic Study
Fish-Tissue Study

Sediment
Bed-Sediment Study