Ground-water-quality classification maps. Ground-water quality is classified by the Utah Water Quality Board based primarily on the total amount of dissolved solids in the water. The lower the total-dissolved-solids concentration, the higher the water quality. Ground-water-quality classification maps show different classes of water in an underlying aquifer (source of underground water). This information can be used to protect higher quality water through more stringent land-use planning.

Ground-water quality classification and recommended septic tank soil-absorption-system density maps, Castle Valley, Grand County, Utah
Special Study 113

• Report text (pdf - 3.8MB)
• Plates 1 - 8 (pdf - 5.8MB)

Water-quality assessment and mapping for the principal valley-fill aquifer in Sanpete Valley, Sanpete County, Utah
Special Study 102

Ground-water quality classification and recommended septic tank soil-absorption-system density maps, Cache Valley, Cache County, Utah
Special Study 101

• Report text (pdf - 1.8MB)
• Plates (pdf - 7.5MB)

Ground-water-quality classification map, Ogden Valley, Weber County, Utah

Ground-water-quality classification map for the principal valley-fill aquifer, Tooele Valley, Tooele County, Utah

Evaluation of potential geologic sources of nitrate contamination in ground water, Cedar Valley, Iron County, Utah with emphasis on the Enoch area (pdf)
Special Study 100

Delineation of drinking water source protection zones for the Mountain Green public-water-supply well, Morgan County, Utah (pdf)
Report of Investigation 261