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National Aquifer Codes

State Cd Nat Aqfr Cd Nat Aqfr Nm
02 N100AKUNCD Alaska unconsolidated-deposit aquifers
01 N100ALLUVL Alluvial aquifers
05 N100ALLUVL Alluvial aquifers
08 N100ALLUVL Alluvial aquifers
10 N100ALLUVL Alluvial aquifers
18 N100ALLUVL Alluvial aquifers
20 N100ALLUVL Alluvial aquifers
21 N100ALLUVL Alluvial aquifers
22 N100ALLUVL Alluvial aquifers
24 N100ALLUVL Alluvial aquifers
29 N100ALLUVL Alluvial aquifers
30 N100ALLUVL Alluvial aquifers
31 N100ALLUVL Alluvial aquifers
34 N100ALLUVL Alluvial aquifers
36 N100ALLUVL Alluvial aquifers
38 N100ALLUVL Alluvial aquifers
39 N100ALLUVL Alluvial aquifers
40 N100ALLUVL Alluvial aquifers
42 N100ALLUVL Alluvial aquifers
46 N100ALLUVL Alluvial aquifers
47 N100ALLUVL Alluvial aquifers
48 N100ALLUVL Alluvial aquifers
49 N100ALLUVL Alluvial aquifers
51 N100ALLUVL Alluvial aquifers
54 N100ALLUVL Alluvial aquifers
56 N100ALLUVL Alluvial aquifers
04 N100BSNRGB Basin and Range basin-fill aquifers
06 N100BSNRGB Basin and Range basin-fill aquifers
16 N100BSNRGB Basin and Range basin-fill aquifers
32 N100BSNRGB Basin and Range basin-fill aquifers
35 N100BSNRGB Basin and Range basin-fill aquifers
41 N100BSNRGB Basin and Range basin-fill aquifers
49 N100BSNRGB Basin and Range basin-fill aquifers
06 N100CACSTL California Coastal Basin aquifers
16 N100CMBPLB Columbia Plateau basin-fill aquifers
41 N100CMBPLB Columbia Plateau basin-fill aquifers
53 N100CMBPLB Columbia Plateau basin-fill aquifers
09 N100GLCIAL Sand and gravel aquifers (glaciated regions)
17 N100GLCIAL Sand and gravel aquifers (glaciated regions)
18 N100GLCIAL Sand and gravel aquifers (glaciated regions)
19 N100GLCIAL Sand and gravel aquifers (glaciated regions)
20 N100GLCIAL Sand and gravel aquifers (glaciated regions)
21 N100GLCIAL Sand and gravel aquifers (glaciated regions)
23 N100GLCIAL Sand and gravel aquifers (glaciated regions)
25 N100GLCIAL Sand and gravel aquifers (glaciated regions)
26 N100GLCIAL Sand and gravel aquifers (glaciated regions)
27 N100GLCIAL Sand and gravel aquifers (glaciated regions)
29 N100GLCIAL Sand and gravel aquifers (glaciated regions)
30 N100GLCIAL Sand and gravel aquifers (glaciated regions)
31 N100GLCIAL Sand and gravel aquifers (glaciated regions)
33 N100GLCIAL Sand and gravel aquifers (glaciated regions)
34 N100GLCIAL Sand and gravel aquifers (glaciated regions)
36 N100GLCIAL Sand and gravel aquifers (glaciated regions)
38 N100GLCIAL Sand and gravel aquifers (glaciated regions)
39 N100GLCIAL Sand and gravel aquifers (glaciated regions)
42 N100GLCIAL Sand and gravel aquifers (glaciated regions)
44 N100GLCIAL Sand and gravel aquifers (glaciated regions)
46 N100GLCIAL Sand and gravel aquifers (glaciated regions)
50 N100GLCIAL Sand and gravel aquifers (glaciated regions)
55 N100GLCIAL Sand and gravel aquifers (glaciated regions)
08 N100HGHPLN High Plains aquifer
20 N100HGHPLN High Plains aquifer
31 N100HGHPLN High Plains aquifer
35 N100HGHPLN High Plains aquifer
40 N100HGHPLN High Plains aquifer
46 N100HGHPLN High Plains aquifer
48 N100HGHPLN High Plains aquifer
56 N100HGHPLN High Plains aquifer
05 N100MSRVVL Mississippi River Valley alluvial aquifer
17 N100MSRVVL Mississippi River Valley alluvial aquifer
21 N100MSRVVL Mississippi River Valley alluvial aquifer
22 N100MSRVVL Mississippi River Valley alluvial aquifer
28 N100MSRVVL Mississippi River Valley alluvial aquifer
29 N100MSRVVL Mississippi River Valley alluvial aquifer
47 N100MSRVVL Mississippi River Valley alluvial aquifer
06 N100PCFNWB Pacific Northwest basin-fill aquifers
16 N100PCFNWB Pacific Northwest basin-fill aquifers
32 N100PCFNWB Pacific Northwest basin-fill aquifers
41 N100PCFNWB Pacific Northwest basin-fill aquifers
49 N100PCFNWB Pacific Northwest basin-fill aquifers
53 N100PCFNWB Pacific Northwest basin-fill aquifers
56 N100PCFNWB Pacific Northwest basin-fill aquifers
06 N100PCFNWV Pacific Northwest volcanic-rock aquifers
16 N100PCFNWV Pacific Northwest volcanic-rock aquifers
30 N100PCFNWV Pacific Northwest volcanic-rock aquifers
32 N100PCFNWV Pacific Northwest volcanic-rock aquifers
41 N100PCFNWV Pacific Northwest volcanic-rock aquifers
49 N100PCFNWV Pacific Northwest volcanic-rock aquifers
53 N100PCFNWV Pacific Northwest volcanic-rock aquifers
56 N100PCFNWV Pacific Northwest volcanic-rock aquifers
35 N100PCSRVR Pecos River Basin alluvial aquifer
48 N100PCSRVR Pecos River Basin alluvial aquifer
48 N100SYMOUR Seymour aquifer
41 N100WLMLWD Willamette Lowland basin-fill aquifers
53 N100WLMLWD Willamette Lowland basin-fill aquifers
40 N300ADAVMS Ada-Vamoosa aquifer
40 N300CNRLOK Central Oklahoma aquifer
04 N300COPLTS Colorado Plateaus aquifers
08 N300COPLTS Colorado Plateaus aquifers
35 N300COPLTS Colorado Plateaus aquifers
49 N300COPLTS Colorado Plateaus aquifers
56 N300COPLTS Colorado Plateaus aquifers
09 N300ERLMZC Early Mesozoic basin aquifers
24 N300ERLMZC Early Mesozoic basin aquifers
25 N300ERLMZC Early Mesozoic basin aquifers
34 N300ERLMZC Early Mesozoic basin aquifers
36 N300ERLMZC Early Mesozoic basin aquifers
37 N300ERLMZC Early Mesozoic basin aquifers
42 N300ERLMZC Early Mesozoic basin aquifers
51 N300ERLMZC Early Mesozoic basin aquifers
26 N300JCBSVL Jacobsville aquifer
55 N300JCBSVL Jacobsville aquifer
19 N300LCRTCS Lower Cretaceous aquifers
20 N300LCRTCS Lower Cretaceous aquifers
27 N300LCRTCS Lower Cretaceous aquifers
30 N300LCRTCS Lower Cretaceous aquifers
31 N300LCRTCS Lower Cretaceous aquifers
38 N300LCRTCS Lower Cretaceous aquifers
46 N300LCRTCS Lower Cretaceous aquifers
56 N300LCRTCS Lower Cretaceous aquifers
30 N300LTRTRY Lower Tertiary aquifers
38 N300LTRTRY Lower Tertiary aquifers
46 N300LTRTRY Lower Tertiary aquifers
56 N300LTRTRY Lower Tertiary aquifers
26 N300MRSHLL Marshall aquifer
36 N300NYSDSN New York sandstone aquifers
01 N300PNSLVN Pennsylvanian aquifers
13 N300PNSLVN Pennsylvanian aquifers
17 N300PNSLVN Pennsylvanian aquifers
18 N300PNSLVN Pennsylvanian aquifers
21 N300PNSLVN Pennsylvanian aquifers
24 N300PNSLVN Pennsylvanian aquifers
26 N300PNSLVN Pennsylvanian aquifers
39 N300PNSLVN Pennsylvanian aquifers
42 N300PNSLVN Pennsylvanian aquifers
47 N300PNSLVN Pennsylvanian aquifers
51 N300PNSLVN Pennsylvanian aquifers
54 N300PNSLVN Pennsylvanian aquifers
40 N300RSHSPG Rush Springs aquifer
72 N300STHCST South Coast aquifer (Puerto Rico)
30 N300UPCTCS Upper Cretaceous aquifers
38 N300UPCTCS Upper Cretaceous aquifers
46 N300UPCTCS Upper Cretaceous aquifers
56 N300UPCTCS Upper Cretaceous aquifers
56 N300WYTRTR Wyoming Tertiary aquifers
40 N400ABKSMP Arbuckle-Simpson aquifer
12 N400BISCYN Biscayne aquifer
40 N400BLAINE Blaine aquifer
48 N400BLAINE Blaine aquifer
04 N400BSNRGC Basin and Range carbonate-rock aquifers
06 N400BSNRGC Basin and Range carbonate-rock aquifers
16 N400BSNRGC Basin and Range carbonate-rock aquifers
32 N400BSNRGC Basin and Range carbonate-rock aquifers
49 N400BSNRGC Basin and Range carbonate-rock aquifers
37 N400CSLHYN Castle Hayne aquifer
78 N400KNGSHL Kingshill aquifer (Virgin Islands)
72 N400NCSTLM North Coast Limestone aquifer system (Puerto Rico)
09 N400NYNECB New York and New England carbonate-rock aquifers
23 N400NYNECB New York and New England carbonate-rock aquifers
25 N400NYNECB New York and New England carbonate-rock aquifers
34 N400NYNECB New York and New England carbonate-rock aquifers
36 N400NYNECB New York and New England carbonate-rock aquifers
42 N400NYNECB New York and New England carbonate-rock aquifers
50 N400NYNECB New York and New England carbonate-rock aquifers
21 N400ORDVCN Ordovician aquifers
47 N400ORDVCN Ordovician aquifers
24 N400PDMBRC Piedmont and Blue Ridge carbonate-rock aquifers
34 N400PDMBRC Piedmont and Blue Ridge carbonate-rock aquifers
37 N400PDMBRC Piedmont and Blue Ridge carbonate-rock aquifers
42 N400PDMBRC Piedmont and Blue Ridge carbonate-rock aquifers
01 N400PDMBRX Piedmont and Blue Ridge crystalline-rock aquifers
10 N400PDMBRX Piedmont and Blue Ridge crystalline-rock aquifers
11 N400PDMBRX Piedmont and Blue Ridge crystalline-rock aquifers
13 N400PDMBRX Piedmont and Blue Ridge crystalline-rock aquifers
24 N400PDMBRX Piedmont and Blue Ridge crystalline-rock aquifers
34 N400PDMBRX Piedmont and Blue Ridge crystalline-rock aquifers
37 N400PDMBRX Piedmont and Blue Ridge crystalline-rock aquifers
42 N400PDMBRX Piedmont and Blue Ridge crystalline-rock aquifers
45 N400PDMBRX Piedmont and Blue Ridge crystalline-rock aquifers
47 N400PDMBRX Piedmont and Blue Ridge crystalline-rock aquifers
51 N400PDMBRX Piedmont and Blue Ridge crystalline-rock aquifers
54 N400PDMBRX Piedmont and Blue Ridge crystalline-rock aquifers
17 N400SLRDVN Silurian-Devonian aquifers
18 N400SLRDVN Silurian-Devonian aquifers
19 N400SLRDVN Silurian-Devonian aquifers
21 N400SLRDVN Silurian-Devonian aquifers
26 N400SLRDVN Silurian-Devonian aquifers
29 N400SLRDVN Silurian-Devonian aquifers
39 N400SLRDVN Silurian-Devonian aquifers
47 N400SLRDVN Silurian-Devonian aquifers
55 N400SLRDVN Silurian-Devonian aquifers
19 N400UPCRBN Upper carbonate aquifer
27 N400UPCRBN Upper carbonate aquifer
01 N500MSSPPI Mississippian aquifers
17 N500MSSPPI Mississippian aquifers
18 N500MSSPPI Mississippian aquifers
19 N500MSSPPI Mississippian aquifers
21 N500MSSPPI Mississippian aquifers
24 N500MSSPPI Mississippian aquifers
29 N500MSSPPI Mississippian aquifers
39 N500MSSPPI Mississippian aquifers
42 N500MSSPPI Mississippian aquifers
47 N500MSSPPI Mississippian aquifers
51 N500MSSPPI Mississippian aquifers
54 N500MSSPPI Mississippian aquifers
27 N500PLOZOC Paleozoic aquifers
30 N500PLOZOC Paleozoic aquifers
38 N500PLOZOC Paleozoic aquifers
46 N500PLOZOC Paleozoic aquifers
56 N500PLOZOC Paleozoic aquifers
01 N500VLYRDG Valley and Ridge aquifers
13 N500VLYRDG Valley and Ridge aquifers
24 N500VLYRDG Valley and Ridge aquifers
34 N500VLYRDG Valley and Ridge aquifers
36 N500VLYRDG Valley and Ridge aquifers
37 N500VLYRDG Valley and Ridge aquifers
42 N500VLYRDG Valley and Ridge aquifers
47 N500VLYRDG Valley and Ridge aquifers
51 N500VLYRDG Valley and Ridge aquifers
54 N500VLYRDG Valley and Ridge aquifers
16 N600CMBPLV Columbia Plateau basaltic-rock aquifers
41 N600CMBPLV Columbia Plateau basaltic-rock aquifers
53 N600CMBPLV Columbia Plateau basaltic-rock aquifers
15 N600HIVLCC Hawaii volcanic-rock aquifers
09 N600NECRSN New York and New England crystalline-rock aquifers
23 N600NECRSN New York and New England crystalline-rock aquifers
25 N600NECRSN New York and New England crystalline-rock aquifers
33 N600NECRSN New York and New England crystalline-rock aquifers
36 N600NECRSN New York and New England crystalline-rock aquifers
44 N600NECRSN New York and New England crystalline-rock aquifers
50 N600NECRSN New York and New England crystalline-rock aquifers
16 N600SKRVPB Snake River Plain basin-fill aquifers
41 N600SKRVPB Snake River Plain basin-fill aquifers
16 N600SKRVPV Snake River Plain basaltic-rock aquifers
41 N600SKRVPV Snake River Plain basaltic-rock aquifers
32 N600SRNVDV Southern Nevada volcanic-rock aquifers
00 N9999OTHER Other aquifers
01 N9999OTHER Other aquifers
02 N9999OTHER Other aquifers
04 N9999OTHER Other aquifers
05 N9999OTHER Other aquifers
06 N9999OTHER Other aquifers
08 N9999OTHER Other aquifers
09 N9999OTHER Other aquifers
10 N9999OTHER Other aquifers
11 N9999OTHER Other aquifers
12 N9999OTHER Other aquifers
13 N9999OTHER Other aquifers
15 N9999OTHER Other aquifers
16 N9999OTHER Other aquifers
17 N9999OTHER Other aquifers
18 N9999OTHER Other aquifers
19 N9999OTHER Other aquifers
20 N9999OTHER Other aquifers
21 N9999OTHER Other aquifers
22 N9999OTHER Other aquifers
23 N9999OTHER Other aquifers
24 N9999OTHER Other aquifers
25 N9999OTHER Other aquifers
26 N9999OTHER Other aquifers
27 N9999OTHER Other aquifers
28 N9999OTHER Other aquifers
29 N9999OTHER Other aquifers
30 N9999OTHER Other aquifers
31 N9999OTHER Other aquifers
32 N9999OTHER Other aquifers
33 N9999OTHER Other aquifers
34 N9999OTHER Other aquifers
35 N9999OTHER Other aquifers
36 N9999OTHER Other aquifers
37 N9999OTHER Other aquifers
38 N9999OTHER Other aquifers
39 N9999OTHER Other aquifers
40 N9999OTHER Other aquifers
41 N9999OTHER Other aquifers
42 N9999OTHER Other aquifers
44 N9999OTHER Other aquifers
45 N9999OTHER Other aquifers
46 N9999OTHER Other aquifers
47 N9999OTHER Other aquifers
48 N9999OTHER Other aquifers
49 N9999OTHER Other aquifers
50 N9999OTHER Other aquifers
51 N9999OTHER Other aquifers
53 N9999OTHER Other aquifers
54 N9999OTHER Other aquifers
55 N9999OTHER Other aquifers
56 N9999OTHER Other aquifers
60 N9999OTHER Other aquifers
62 N9999OTHER Other aquifers
66 N9999OTHER Other aquifers
67 N9999OTHER Other aquifers
69 N9999OTHER Other aquifers
71 N9999OTHER Other aquifers
72 N9999OTHER Other aquifers
73 N9999OTHER Other aquifers
74 N9999OTHER Other aquifers
75 N9999OTHER Other aquifers
76 N9999OTHER Other aquifers
77 N9999OTHER Other aquifers
78 N9999OTHER Other aquifers
79 N9999OTHER Other aquifers
06 S100CNRLVL Central Valley aquifer system
01 S100CSLLWD Coastal lowlands aquifer system
12 S100CSLLWD Coastal lowlands aquifer system
22 S100CSLLWD Coastal lowlands aquifer system
28 S100CSLLWD Coastal lowlands aquifer system
48 S100CSLLWD Coastal lowlands aquifer system
01 S100MSEMBM Mississippi embayment aquifer system
05 S100MSEMBM Mississippi embayment aquifer system
17 S100MSEMBM Mississippi embayment aquifer system
21 S100MSEMBM Mississippi embayment aquifer system
22 S100MSEMBM Mississippi embayment aquifer system
28 S100MSEMBM Mississippi embayment aquifer system
29 S100MSEMBM Mississippi embayment aquifer system
47 S100MSEMBM Mississippi embayment aquifer system
10 S100NATLCP Northern Atlantic Coastal Plain aquifer system
11 S100NATLCP Northern Atlantic Coastal Plain aquifer system
24 S100NATLCP Northern Atlantic Coastal Plain aquifer system
25 S100NATLCP Northern Atlantic Coastal Plain aquifer system
34 S100NATLCP Northern Atlantic Coastal Plain aquifer system
36 S100NATLCP Northern Atlantic Coastal Plain aquifer system
37 S100NATLCP Northern Atlantic Coastal Plain aquifer system
42 S100NATLCP Northern Atlantic Coastal Plain aquifer system
44 S100NATLCP Northern Atlantic Coastal Plain aquifer system
51 S100NATLCP Northern Atlantic Coastal Plain aquifer system
16 S100NRMTIB Northern Rocky Mountains Intermontane Basins aquifer systems
30 S100NRMTIB Northern Rocky Mountains Intermontane Basins aquifer systems
53 S100NRMTIB Northern Rocky Mountains Intermontane Basins aquifer systems
56 S100NRMTIB Northern Rocky Mountains Intermontane Basins aquifer systems
53 S100PGTSND Puget Sound aquifer system
08 S100RIOGRD Rio Grande aquifer system
35 S100RIOGRD Rio Grande aquifer system
48 S100RIOGRD Rio Grande aquifer system
01 S100SECSLP Southeastern Coastal Plain aquifer system
13 S100SECSLP Southeastern Coastal Plain aquifer system
17 S100SECSLP Southeastern Coastal Plain aquifer system
28 S100SECSLP Southeastern Coastal Plain aquifer system
45 S100SECSLP Southeastern Coastal Plain aquifer system
47 S100SECSLP Southeastern Coastal Plain aquifer system
01 S100SURFCL Surficial aquifer system
12 S100SURFCL Surficial aquifer system
13 S100SURFCL Surficial aquifer system
37 S100SURFCL Surficial aquifer system
45 S100SURFCL Surficial aquifer system
22 S100TXCLUP Texas coastal uplands aquifer system
48 S100TXCLUP Texas coastal uplands aquifer system
17 S300CAMORD Cambrian-Ordovician aquifer system
19 S300CAMORD Cambrian-Ordovician aquifer system
26 S300CAMORD Cambrian-Ordovician aquifer system
27 S300CAMORD Cambrian-Ordovician aquifer system
29 S300CAMORD Cambrian-Ordovician aquifer system
55 S300CAMORD Cambrian-Ordovician aquifer system
08 S300DNVRBS Denver Basin aquifer system
01 S400FLORDN Floridan aquifer system
12 S400FLORDN Floridan aquifer system
13 S400FLORDN Floridan aquifer system
45 S400FLORDN Floridan aquifer system
05 S400OZRKPL Ozark Plateaus aquifer system
17 S400OZRKPL Ozark Plateaus aquifer system
20 S400OZRKPL Ozark Plateaus aquifer system
29 S400OZRKPL Ozark Plateaus aquifer system
40 S400OZRKPL Ozark Plateaus aquifer system
35 S400RSWLBS Roswell Basin aquifer system
05 S500EDRTRN Edwards-Trinity aquifer system
40 S500EDRTRN Edwards-Trinity aquifer system
48 S500EDRTRN Edwards-Trinity aquifer system
12 S500INTRMD Intermediate aquifer system