National Water-Quality Assessment (NAWQA) Program

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Groundwater-Quality Trends

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| Nitrate | Chloride | Dissolved solids |

Changes of dissolved solids (sometimes called total dissolved solids, or TDS) concentrations were evaluated in groundwater samples collected from 1,184 wells in 54 well networks across the United States (Lindsey and Rupert, 2012). Of the 54 well networks that were analyzed for changes in dissolved solids concentrations using the Wilcoxon-Pratt signed-rank test (1959), 22 had statistically significant increases in concentrations of dissolved solids. One well network had a statistically significant decrease in concentrations of dissolved solids.

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Apalachicola-Chattahoochee-Flint River Basin - acfbluscr3 Apalachicola-Chattahoochee-Flint River Basin - acfbsus1 Albemarle-Pamlico Drainage Basin  - albelusag1 Central Arizona Basins - cazbsus1a Central Columbia Plateau - Yakima River Basin - ccptlusag2b Central Columbia Plateau - Yakima River Basin - ccptlusor1b Central Columbia Plateau - Yakima River Basin - ccptsus1b Eastern Iowa Basins - eiwaluscr1 Eastern Iowa Basins - eiwasus2 Georgia-Florida Coastal Plain - gaflluscr1 High-Plains Regional Groundwater Study - hpgwsus1a Lake Erie-Lake Saint Clair Drainages - lerilusrc1 Lake Erie-Lake Saint Clair Drainages - lerisus1 Long Island-New Jersey Coastal Drainages   - linjlusrc1 Long Island-New Jersey Coastal Drainages   - linjsus2 Lower Illinois River Basin - lirbsus1 Mississippi Embayment - miselusrc1 New England Coastal Basins - necblusrc1 Nevada Basin and Range  - nvbrsus2 Ozark Plateaus - ozrklusag2a Potomac River Basin and Delmarva Peninsula  - potolusag1 Puget Sound Basin - pugtluscr1 Puget Sound Basin - pugtlusrs1 Rio Grande Valley - rioglusag1 Rio Grande Valley - riogluscr1 Rio Grande Valley - rioglusrc1 California map California map California map California map California map California map California map California map Santee River Basin and Coastal Drainages - santluscr1 Santee River Basin and Coastal Drainages - santlusrc1 Santee River Basin and Coastal Drainages - santsus2 South-Central Texas - sctxlusrc1 South-Central Texas - sctxsus1 Southern Florida - sofllusor1 Southern Florida - sofllusrc1a South Platte River Basin - spltluscr1 Trinity River Basin - trinsus3 Upper Colorado River Basin - ucollusrc1 Upper Illinois River Basin - uirblusrc1 Upper Mississippi River Basin - umisluscr1 Upper Mississippi River Basin - umislusrc1 Upper Mississippi River Basin - umissus3 Upper Snake River Basin - usnkluscr2 Upper Snake River Basin - usnkluscr3 White and Great and Little Miami River Basins  - whitluscr1 Willamette Basin - willlusag3 Western Lake Michigan Drainages - wmiclusag2 Western Lake Michigan Drainages - wmicsus1

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