USGS

National Water-Quality Assessment (NAWQA) - Links to Study Units

For more information about a study unit, see the map or table below and find the link to the study unit of interest. Not all study units are on-line right now, but check back because we continue to add them as they become available.

If you know the 4-letter ABBREVIATION for the NAWQA study unit you want to access, the standard URL for each study unit is:
http://water.usgs.gov/lookup/get?nawqaxxxx
where xxxx is the study unit abbreviation. The abbreviations are listed in the table below.

A digital file of the NAWQA study unit boundaries for use in spatial data analysis is available in the National Geospatial Data Clearinghouse.

NAWQA study unit map Oahu High Plains Regional Ground Water Study Cook Inlet Basin Central Columbia Plateau Yakima River Basin Upper Mississippi River Basin Cheyenne and Belle Fourche Basins Nevada Basin and Range Lower Illinois River Basin Kansas River Basin Canadian-Cimarron River Basins Santee Basin and Costal Drainages Santa Ana Basin Red River of the North Basin Long Island-New Jersey Coastal Drainings South Central Texas San Joaquin-Tulare Basins Great and Little Miami River Basins Yellowstone Basin Middle Arkansas River Central Nebraska Basin Georgia-Florida Coastal Plain Apalachicola-Chattahoochee-Flint River Basin Mobile River and Tributaries Upper Snake River Basin Great Salt Lake Basins Northern Rockies Intermontane Basins Rio Grande Valley Puget Sound Basin Sacramento Basin Nevada Basin and Range Willamette Basin Central Arizona Basins Southern High Plains Acadian-Pontchartrain Southern Florida Lower Tennessee River Basin Mississippi Embayment Eastern Iowa Basins Western Lake Michigan Drainage Allegheny and Monogahela Basins Lake Erie-Lake Saint Clair Drainage Upper Illinois River Basin New England Costal Basins Connecticut, Housatonic, and Thames River Basins Hudson River Basin Delaware River Basin Lower Susquehanna River Basin Albemarle-Pamlico Drainage White River Basin Kentucky River Basin Potomac River Basin Upper Tennessee River Basin Upper Arkansas River Basin South Platte River Basin Upper Colorado River Basin Trinity River Basin Delmarva Peninsula Kanawha-New River Basin Ozark Plateaus Virginia


NAWQA Study Units

Number on map

NAWQA Study unit name

Starting year

States in study unit

Study unit abbreviation

1

New England Coastal Basins

1997

ME, MA, NH, RI

NECB

2

Connecticut, Housatonic, and Thames River Basins

1991

CT, MA, NH, NY, RI, VT

CONN

3

Hudson River Basin

1991

NY, CT, MA, NJ, VT

HDSN

4

Long Island-New Jersey Coastal Drainages

1994

NJ, NY

LINJ

5

Delaware River Basin

1997

PA, NY, NJ

DELR

6

Lower Susquehanna River Basin

1991

PA, MD

LSUS

7

Delmarva Peninsula

1999

DE, MD, VA

DLMV

8

Potomac River Basin

1991

DC, MD, PA, VA, WV

POTO

9

Allegheny and Monongahela Basins

1994

MD, NY, PA, WV

ALMN

10

Kanawha-New River Basin

1994

WV, VA, NC

KANA

11

Lake Erie-Lake Saint Clair Drainage

1994

IN, MI, OH, PA, NY

LERI

12

Great and Little Miami River Basins

1997

OH, IN

MIAM

13

White River Basin

1991

IN

WHIT

14

Upper Illinois River Basin

1997

IL, WI, IN

UIRB

15

Lower Illinois River Basin

1994

IL

LIRB

16

Western Lake Michigan Drainage

1991

MI, WI

WMIC

17

Upper Mississippi River Basin

1994

MN, WI

UMIS

18

Red River of the North Basin

1991

MN, ND, SD

REDN

19

Albemarle-Pamlico Drainage

1991

NC, VA

ALBE

20

Upper Tennessee River Basin

1994

GA, KY, NC, SC, TN, VA

UTEN

21

Santee Basin and Coastal Drainages

1994

SC, NC

SANT

22

Apalachicola-Chattahoochee-Flint River Basin

1991

AL, FL, GA

ACFB

23

Georgia-Florida Coastal Plain

1991

GA, FL

GAFL

24

Southern Florida

1994

FL

SOFL

25

Kentucky River Basin

none

KY

KNTY

26

Mobile River and Tributaries

1997

MS, AL, GA

MOBL

27

Mississippi Embayment

1994

AR, KY, LA, MS, MO, TN

MISE

28

Acadian-Pontchartrain

1997

LA, MS

ACAD

29

Lower Tennessee River Basin

1997

TN, AL, GA

LTEN

30

Eastern Iowa Basins

1994

IA, MN

EIWA

31

Ozark Plateaus

1991

AR, KS, MO, OK

OZRK

32

Canadian-Cimarron River Basins

none

NM, TX, OK, CO, KS

CACI

33

Trinity River Basin

1991

TX

TRIN

34

South Central Texas

1994

TX

SCTX

35

Central Nebraska Basins

1991

NE

CNBR

36

Kansas River Basin

none

CO, NE, KS

KANS

37

Upper Arkansas River Basin

none

CO, NM

UARK

38

Middle Arkansas River Basin

none

CO, KS, OK

MARK

39

Southern High Plains

none

NM, TX

SHPL

40

South Platte River Basin

1991

CO, NE, WY

SPLT

41

North Platte River Basin

none

WY, CO, NE

NPLT

42

Cheyenne and Belle Fourche Basins

none

WY, SD, NE

CHEY

43

Yellowstone Basin

1997

MT, WY, ND

YELL

44

Upper Colorado River Basin

1994

CO, UT

UCOL

45

Rio Grande Valley

1991

CO, NM, TX

RIOG

46

Northern Rockies Intermontane Basins

1997

ID, MT, WA

NROK

47

Great Salt Lake Basins

1997

UT, ID, WY

GRSL

48

Upper Snake River Basin

1991

ID, MT, NV, UT, WY

USNK

49

Central Arizona Basins

1994

AZ

CAZB

50

Central Columbia Plateau

1991

ID, WA

CCPT

51

Yakima River Basin

1999

WA

YAKI

52

Puget Sound Basin

1994

WA

PUGT

53

Willamette Basin

1991

OR

WILL

54

Sacramento Basin

1994

CA

SACR

55

Nevada Basin and Range

1991

NV, CA

NVBR

56

San Joaquin-Tulare Basins

1991

CA

SANJ

57

Santa Ana Basin

1997

CA

SANA

58

Oahu

1997

HI

OAHU

59

Cook Inlet Basin

1997

AK

COOK

¾

High Plains Regional Ground Water Study

1998

TX, NM, OK, KS, NE, CO, WY, SD

HPGW


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