USGS NAWQA STUDY UNIT CLICKABLE MAP

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

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

Study units /nawqa/studyu.html NAWQA http://water.usgs.gov/nawqa/ WATER

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