Long Island Expwy

Middle Country Rd

Sunrise Hwy

Will ai m F ol yd Pkwy

Middle Country Rd

Long Island Expwy

Sunrise Hwy

West Main St

Main Rd

Main Rd

Main Rd

Sunrise Hwy

Montauk Highway

Montauk Hwy

Montauk Hwy

Montauk Hwy

Medford Rd

Patchogue - Yaphank Rd

Nesconset Rd

Patchogue - Port Jefferson Rd

Main St

Rocky Po ni t Rd

Sound Ave

Sound Avenue

Parker Road

Nugent Dr

Moriches - Riverhead Rd

Roanoke Ave

East Main St

Cross River Dr

Riverhead - Quogue Rd

Sound Ave

Montauk Hwy

Port Jefferson - West Hampton Rd

O dl Riverhead Rd

Lewis Rd

Montauk Hwy

Riverhead - Hampton Bays Rd

Montauk Hwy

(Hill St)

Ferry Rd

South Ferry Rd

Hampton St

Sag Harbor Tpke

Main St

William

Floyd Pkwy

Yaphank -

M di d el Island Rd

Gowanus Expwy

Belt Pkwy

(Shore Pkwy)

Belt Pkwy

(Shore Pkwy)

Belt Pkwy

(Shore Pkwy)

Belt Pkwy

Van Wyck Expwy

Cross Island Pkwy Sunrise Hwy

Southern State Pkwy

Brooklyn - Queens Expressway

Long Island Expwy

Queens Blvd

Grand Central Pkwy

Whitestone Expwy

Van Wyck Expwy

Linden Blvd

Clearview Expwy

Cross Island Pkwy

Jericho Tpke

Long Island Expwy

Meadowbrook State Pkwy

Jericho Turnpike

Jericho Tpke

Long Island Expwy

Wantagh State Pkwy

Seaford - Oyster Bay Expwy

Northern State Pkwy

Loop Pkwy

Meadowbrook State Pkwy

Sunrise Hwy

Ocean Pkwy

Wantagh State Pkwy

Southern State Pkwy

Southern State Pkwy

Sunrise Hwy

Ocean Pkwy

Robert Moses Twin Causeway

Jericho Tpke

Northern State Pkwy

Long Island Expwy

Sunken Meadow State Pkwy

Sagt ki os State Parkway

Southern State Pkwy

Heckscher State Pkwy

Long Island Expwy

Middle Country Rd

Ocean Pkwy

Kings Highway Flatbush Ave

Prospect Ave

Flatbush Avenue

Broadway

Eastern Parkway

Bay Pkwy

Northern Blvd

Woodhaven Blvd

Union Tpke

Myrtle Ave

Myrtle Ave

Cross Bay Blvd

Rockaway Blvd

Linden Blvd

Hillside Ave Rockaway Blvd

Merrick Blvd

Utop ai Pkwy

Northern Blvd

Northern Blvd

M di d el Neck

Franklin Ave

Hempstead Tpke

Merrick Rd

Lido Blvd

Peninsula Blvd

Merrick Rd

Newbr di ge Rd

Hempstead Tpke

Port Washington Blvd

Hicksville Rd

Northern Blvd

Jer ci ho - Oyster Bay Rd

Cedar Swamp Rd

Montauk Hwy

New York Ave

Deer Park Ave

New York Ave

Northern Blvd

Northern Blvd

Elwood Rd

Wheeler Rd

Veterans Memorial Hwy

Hauppauge Rd

North Country Rd

Nesconset - Port Jefferson Hwy

Stony Brook Rd

Car el ton Ave

Smithtown Ave

Montauk Hwy

Sunrise Hwy

Veterans Memorial Hw

No

y

rthern State Pkwy

Jamaica Ave

Hillside Ave

Union Tpke

Grand Central Pkw

Lon

y

g Island Expwy

Rd

ATLANTIC OCEAN

LOWER

NEW YORK

BAY

UPPER

NEW YORK

BAY

SMITHTOWN

BAY

JAMAICA

BAY

EAST

RIVER

NORTHPORT

BAY

HUNTINGTON

BAY OYSTER

BAY

HARBOR

MANHASSET 

BAY

LITTLE

NECK

BAY

COLD

SPRING

HARBOR

HEMPSTEAD 

HARBOR

FLUSHING

BAY

HUDSON

RIVER

EAST

BAY

LONG

ISLAND

SOUND

NICOLL

BAY

LONG ISLAND SOUND

ATLANTIC OCEAN

BLOCK ISLAND 

SOUND

GARDINERS

BAY

GREAT

PECONIC

BAY

NAPEAGUE

BAY

LITTLE

PECONIC

BAY

NOYACK

BAY

MORICHES

BAY

SHINNECOCK

BAY

NORTHWEST

HARBOR

THREE

 MILE 

HARBOR

ORIENT

HARBOR

SOUTHOLD

BAY

HOG

NECK

BAY

CUTCHOGUE

HARBOR

MECOX

BAY

FLANDERS

BAY

TIANA

BAY

BELLPORT 

BAY PATCHOGUE 

BAY

GREAT SOUTH BAY

SOUTH

OYSTER

BAY

SHELTER ISLAND SOUND

NEW YORK

NEW YORK

COUNTY

HUDSON

COUNTY

BRONX COUNTY

RICHMOND

COUNTY

WESTCHESTER

COUNTY

KINGS

COUNTY

QUEENS

COUNTY

NEW YORK

NEW JERSEY

NEW YORK

NEW JERSEY

NEW YORK

NEW YORK COUNTY

SUFFOLK COUNTY

KINGS COUNTY

NEW YORK COUNTY

QUEENS COUNTY

BRONX COUNTY

QUEENS COUNTY

NASSAU COUNTY

BRONX COUNTY

WESTCHESTER COUNTY

BRONX COUNTY

WESTCHESTER COUNTY

NASSAU COUNTY

CONNECTICUT

NEW YORK

FAIRFIELD COUNTY

NASSAU COUNTY

CONNECTICUT

SUFFOLK COUNTY

NASSAU COUNTY

SUFFOLK COUNTY

NASSAU COUNTY SUFFOLK COUNTY

NASSAU COUNTY

NASSAU COUNTY

QUEENS COUNTY

QUEENS COUNTY

NASSAU COUNTY

QUEENS COUNTY

KINGS COUNTY

KINGS COUNTY

QUEENS COUNTY

NEW YORK COUNTY

HUDSON COUNTY RICHMOND COUNTY KINGS COUNTY

NASSAU 

COUNTY

SUFFOLK COUNTY

CONNECTICUT

NEW HAVEN COUNTY

NEW JERSEY

NEW YORK

NEW JERSEY

NEW YORK

-74° -73°30' -73° -72°30' -72°

-74° -73°30' -73° -72°30' -72°

40°50'

40°40'

40°30'

41°10'

41°

40°50'

10 0 10 MILES

10 0 10 KILOMETERS

SCALE=1:125,000

NEW YORK

CONNECTICUT

NEW JERSEY

Long Island

ATLANTIC OCEAN

20 0 20 KILOMETERS

20 0 20 MILES

U.S. DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY

Prepared in cooperation with the

NASSAU COUNTY DEPARTMENT OF PUBLIC WORKS

NEW YORK CITY DEPARTMENT OF ENVIRONMENTAL PROTECTION

NEW YORK STATE DEPARTMENT OF ENVIRONMENTAL CONSERVATION

SUFFOLK COUNTY DEPARTMENT OF HEALTH SERVICES

SUFFOLK COUNTY WATER AUTHORITY

TOWN OF NORTH HEMPSTEAD

TOWN OF SHELTER ISLAND

AND THE U.S. ENVIRONMENTAL PROTECTION AGENCY

Base from U.S. Geological Survey digital data 1:100,000 series

Lambert Conformal Conic projection

Standard parallels 40° 40' N and 41° 2' N, central meridian 74° 00' W

North American Datum of 1983 Water-Table and Potentiometric-Surface Altitudes in the Upper Glacial, Magothy, and Lloyd Aquifers beneath Long Island, New York, April–May 2010

By

Jack Monti, Jr., Michael Como, and Ronald Busciolano

2013

For additional information write to:

Director, U.S. Geological Survey, 2045 Route 112, Coram, NY 11727

Copies of this report are available on-line at http://ny.water.usgs.gov or can be purchased from:

U.S. Geological Survey, Branch of Information Services, Box 25286, Denver, CO 80225-0286

Suggested citation: Monti, Jack, Jr., Como, Michael, and Busciolano, Ronald, 2013, Water-table and potentiometricsurface altitudes in the Upper Glacial, Magothy, and Lloyd aquifers beneath Long Island, New York, April-May 2010: 

U.S. Geological Survey Scientific Investigations Map 3270, 4 sh., http://dx.doi.org/10.3133/sim3270.

Hydrology by Jack Monti, Jr.

ISSN 2329-132X (online)

http://dx.doi.org/10.3133/sim3270

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S48579

5.00

N6031

9.00

S65608

71.00

S45210

68.00

N12239

48.00

Q3814

44.00

Q3808

18.00

S75438

1.90

S90279

2.8

S39269

5.60

N12743

6.60

S16787

6.92

S16783

4.47

S51182

5.65

S52084

7.05

S75432

1.91

S51176

8.88

S16780

4.42

S58922

3.58

S51169

3.61

S51183

6.27

S70618

4.93

S51177

6.26

S51170

3.56

S48519

4.46

S70614

7.48

S70263

5.34 S48577

5.47

S51185

3.69

S62397

6.68

S51186

3.77

S58921

4.49

S15048

9.96

S53325

6.03

S8844

9.32

S57372

3.74

S53333

10.60

S 6558

8.97

S40853

40.90

S62395

9.57

S47231

S52449 3.94

9.15

S57366

6.44

S8836

10.20

S46533

9.35

S41050

75.80

S54883

38.50

S55049

60.10

S16881

32.9

S3871

50.40

S47750

33.80

S47751

8.92

S128338

7.58

S128331

2.95

S1806

59.60

S63835

8.66

S 67537

2.09

N9118

7.25

N10606

70.10

N9609

8.47

N9900

36.30

N1120

50.10

N9906

87.80

N8877

12.10

N13374

28.40

N9668

31.80

N13373

25.20

N53

13.70

N1115

12.50

N1422

8.22

Q1326

18.10

Q2418

1.48

Q1189

8.01

Q2324

5.94

Q3117

5.43

Q2994

6.08

Q3114

3.08

Q3115

4.45

K1301

4.78

K3483

6.42

K3482

8.57

K1194

9.23

K3271

K3256 7.52

6.38

K3246

8.76

K3424

7.77

K3255

4.66

K3273

K3275 7.04

3.91

K3254

K3405 5.15

4.33

K3248

4.13

K3252

K3274 1.48

3.04

K3159

2.87

K3250

1.39

S62402

41.19

S73974

10.12

S70627

23.62

S58923

11.61

S38461

10.22

S53324

12.21

S57371

12.01

S91814

14.33

S58925

13.81 S58924

S46524 12.63

13.58

S8843

12.57

S16756

12.56

S8839

11.96

S58960

26.63 S58959

20.27

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13.47

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34.88

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19.21 S46525

17.32

S58958

30.56

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23.48

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32.37

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33.64

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27.62

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11.33

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29.07

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34.02

S69781

10.48

S40849

46.12

S8831

11.38

S36013

24.44

S66512

55.43

S76834

54.77

S74302

22.26

S74291

39.78

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50.53

S46530

13.57

S47230

13.32

S47754

28.17

S42681

34.42

S16883

33.73

S65855

55.03

S6443

45.13

S3955

59.31 S42683

59.16

S46536

15.08

S74292

42.08

S77435

10.56

S6413

53.05

S46542

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S36147

39.15

S74308

24.53

S67564

63.47

S66506

57.29

S46281

21.68

S46517

70.01

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49.81

S46534

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50.46

S6441

39.77

S40842

56.86

S50512

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S3870

60.88

S46544

30.65

S45207

65.45

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16.85

S40843

37.86

S57484

11.72

S50500

76.08

S2485

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72.49

S57488

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22.68

S65602

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S36152

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S50505

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S45208

81.83

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58.09

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S47489

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N8891

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N12240 82.96

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N1243

57.89

N12264

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N10245

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N6294

73.63

N1228

65.49

N2635

28.95

N10608

73.84

N9896

81.29

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30.66

N9059

82.23

N10607

79.34

N11551

69.88

N9099

29.09

N9313

50.58 N8309

43.35

N9089

83.79

N9892

13.18

N9711

62.55

N1195

83.04

N1102

44.22

N12455

39.58

N8269

72.41 N1614

65.18

N1197

74.81

N9983

50.92

N9662

56.17

N10035

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53.18 N12250

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N9945

46.85

N9979

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N12249

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N1110

19.46

N13372

19.61

N10001

11.78

Q3119

21.84

Q3816

29.26

Q3815

30.08

Q3121

24.95

Q3646

14.81

Q3806

30.78

Q3644

28.72

Q3647

24.64

Q3122

14.77

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18.62

Q3805

29.08 Q3804

46.86

Q2346

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Q3660

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47.18

Q3968

38.98

Q3809

13.62 Q3650

10.07

Q3661

33.19

Q3652

17.43

Q3807

16.34

Q3649

14.66

K3260

11.28

K3245

13.32

K3425

11.58

K3301

18.36

K3257

K3430 10.57

11.29 K1265

10.18

N12451

125.41

N9694

117.16

S70617

13.35

S57369

18.94

S128339

11.59

N6342

21.84

N11930

11.51

N9899

18.43

N9902

78.39

N9897

31.42

N8970

34.26

S120291

65.97

Q3988

23.77

N1616

78.10

S75433

1.78

S4271

12.90

S51567

18.60

S1812

51.94

S123414

25.97

N1615

43.57

N1129

31.59

Q3659

28.27

Q3651

19.79

Q1249

40.43 Q3163

33.69 Q3165

21.07

S75435

3.60

S8833

19.64

S45637

9.83

N9478

5.36

S5517

47.53

S65604

27.47

S1810

55.64

S1803

17.37

Q3604

22.95

Q3162

14.86

Q3160

14.72

K 3276

11.21

Q3810

18.89

S125986

3.54

#

#

#

#

#

#

#

#

##

#

#

# ##

#

6.9

11.5 19.2 7.27

2.47

6.45

7.35

5.75

16.8

16.32 19.29

11.59

18.14

30.94 19.34

10.51

Water-Table and Potentiometric-Surface Altitudes in the Upper Glacial, Magothy, and Lloyd Aquifers 

beneath Long Island, New York, April–May 2010 

By Jack Monti, Jr., Michael Como, and Ronald Busciolano

Introduction

The U.S. Geological Survey (USGS), in cooperation with State and local agencies, systematically collects groundwater data at varying measurement 

frequencies to monitor the hydrologic conditions on Long Island, New York. Each year during April and May, the USGS conducts a synoptic survey of water 

levels to define the spatial distribution of the water table and potentiometric surfaces within the three main water-bearing units underlying Long Island—the 

upper glacial, Magothy, and Lloyd aquifers (Smolensky and others, 1989)—and the hydraulically connected Jameco (Soren, 1971) and North Shore aquifers 

(Stumm, 2001). These data and the maps constructed from them are commonly used in studies of Long Island’s hydrology and are used by water managers 

and suppliers for aquifer management and planning purposes.

Water-level measurements made in 503 monitoring wells, a network of observation and supply wells, and 16 streamgage locations across Long 

Island during April–May 2010 were used to prepare the maps in this report. Measurements were made by the wetted-tape method to the nearest hundredth 

of a foot. Water-table and potentiometric-surface altitudes in these aquifers were contoured by using these measurements. The water-table contours were 

interpreted by using water-level data collected from 16 streamgages, 349 observation wells, and 1 supply well screened in the upper glacial aquifer and (or) 

shallow Magothy aquifer; the Magothy aquifer’s potentiometric-surface contours were interpreted from measurements at 67 observation wells and 27 

supply wells screened in the middle to deep Magothy aquifer and (or) the contiguous and hydraulically connected Jameco aquifer. The Lloyd aquifer’s 

potentiometric-surface contours were interpreted from measurements at 55 observation wells and 4 supply wells screened in the Lloyd aquifer or the 

contiguous and hydraulically connected North Shore aquifer. Many of the supply wells are in continuous operation and, therefore, were turned off for a 

minimum of 24 hours before measurements were made so that the water levels in the wells could recover to the level of the potentiometric head in the 

surrounding aquifer. Full recovery time at some of these supply wells can exceed 24 hours; therefore, water levels measured at these wells are assumed to 

be less accurate than those measured at observation wells, which are not pumped (Busciolano, 2002). In this report, all water-level altitudes are 

referenced to the National Geodetic Vertical Datum of 1929 (NGVD 29).

Hydrographs are included on these maps for selected wells that are instrumented with recording equipment. These hydrographs are 

representative of the 2010 water year1

 to show the changes that have occurred throughout that period. The synoptic survey water level measured at the 

well is included on each hydrograph.

Upper Glacial and Upper Magothy Aquifers (water table)

The upper glacial aquifer of Pleistocene age is the uppermost unit in Long Island’s groundwater system and contains the water table throughout 

the island, except in parts of central and eastern Nassau County and western Suffolk County, where the entire upper glacial aquifer is unsaturated and the 

water table is in the shallow Magothy aquifer. The upper glacial aquifer was the principal source of water supply throughout Long Island for several 

decades, but contamination in many areas resulted in the widespread curtailment of its use for public supply. The general configuration of the water table 

is an east-west mound that coincides with the glacial moraine along the center of the island with an isolated high in central Nassau County and another in 

central Suffolk County. Local highs also are present in northwestern Nassau County (Stumm and others, 2002) and the central part of the southern 

peninsula of eastern Suffolk County (Schubert and others, 2004). These highs are a result of the low hydraulic conductivity of the geologic units underlying 

these wells.

The water-table altitude on Long Island during April–May 2010 ranged from 0 feet (ft) along the shore to more than 125 ft above NGVD 29 in 

northwestern Nassau County. In Kings County, 26 measurements ranged from 1.39 to 18.36 ft; in Queens County, 42 measurements ranged from 1.48 to 47.18 

ft; in Nassau County, 72 measurements ranged from 5.36 to 125.41 ft; and in Suffolk County, 210 measurements ranged from 1.78 to 81.83 ft above NGVD 29.

 

1

A water year is the 12-month period beginning October 1 and ending September 30. It is designated by the year in which it ends. 

Water-table contour—Shows altitude of water table, 

 April-May 2010. Solid where approximately known; 

 dashed where inferred. Contour interval is variable. Datum is NGVD 29 

20

S 58922

2.55

Monitoring well—Green circle indicates the observation well is screened 

 in the upper glacial aquifer; green circle with thick border indicates 

 the supply well is screened in the upper glacial aquifer; red circle 

 indicates the observation well is screened in the Magothy aquifer. Upper number 

 is well number assigned by the New York State Department of 

 Environmental Conservation; lower number is water-table altitude, in 

 feet above or below NGVD 29 

EXPLANATION

399 feet 

0 feet 

Land surface topography—Shows land surface altitude in feet above NAVD 88

# 19.34 Streamgage— Number is altitude of water in the stream in feet above NGVD 29 

SCIENTIFIC INVESTIGATIONS MAP 3270

Water table—SHEET 1 of 4

Monti, Jack, Jr., Como, Michael, and Busciolano, Ronald, 2013,

Water-Table and Potentiometric-Surface Altitudes in the Upper Glacial, Magothy, and Lloyd Aquifers beneath Long Island, New York, April–May 2010

S125364

2.27

Date

Oct 2009

Nov 2009

Dec 2009

Jan 2010

Feb 2010

Mar 2010

Apr 2010

May 2010

June 2010

July 2010

Aug 2010Sep 2010

Daily Altitude above NGVD 1929, feet 35.0

37.0

39.0

41.0

43.0

45.0 USGS 404241073443301 Q 1249. 2

Daily mean altitude above NGVD 1929

Water level shown on map (NGVD 1929)

EXPLANATION

Oct 2010

Date

Oct 2009

Nov 2009

Dec 2009

Jan 2010

Feb 2010

Mar 2010

Apr 2010

May 2010

June 2010

July 2010

Aug 2010

Sep 2010

Daily Altitude above NGVD 1929, feet 15.0

17.0

19.0

21.0

23.0

25.0 USGS 404251073512601 Q 3651. 1

Daily mean altitude above NGVD 1929

Water level shown on map (NGVD 1929)

EXPLANATION

Oct 2010

Date

Oct 2009

Nov 2009

Dec 2009

Jan 2010

Feb 2010Mar 2010

Apr 2010

May 2010

June 2010

July 2010

Aug 2010

Sep 2010

Daily Altitude above NGVD 1929, feet 23.0

25.0

27.0

29.0

31.0

33.0 USGS 404757073440401 N 9099. 1

Daily mean altitude above NGVD 1929

Water level shown on map (NGVD 1929)

EXPLANATION

Oct 2010

Date

Oct 2009

Nov 2009

Dec 2009

Jan 2010

Feb 2010Mar 2010

Apr 2010

May 2010

June 2010

July 2010

Aug 2010

Sep 2010

Daily Altitude above NGVD 1929, feet 72.0

74.0

76.0

78.0

80.0

82.0 USGS 404553073351201 N 1616. 3

Daily mean altitude above NGVD 1929

Water level shown on map (NGVD 1929)

EXPLANATION

Oct 2010

Date

Oct 2009

Nov 2009

Dec 2009

Jan 2010

Feb 2010Mar 2010

Apr 2010

May 2010

June 2010

July 2010

Aug 2010Sep 2010

Daily Altitude above NGVD 1929, feet 45.0

47.0

49.0

51.0

53.0

55.0 USGS 404958073085001 S 1812. 3

Daily mean altitude above NGVD 1929

Water level shown on map (NGVD 1929)

EXPLANATION

Oct 2010

NO DATA

Date

Oct 2009

Nov 2009

Dec 2009

Jan 2010

Feb 2010

Mar 2010

Apr 2010

May 2010

June 2010

July 2010

Aug 2010

Sep 2010

Daily Altitude above NGVD 1929, feet 40.0

42.0

44.0

46.0

48.0

50.0 USGS 405149072532201 S 5517. 1

Daily mean altitude above NGVD 1929

Water level shown on map (NGVD 1929)

EXPLANATION

Oct 2010

Date

Oct 2009

Nov 2009

Dec 2009

Jan 2010

Feb 2010

Mar 2010

Apr 2010

May 2010

June 2010

July 2010

Aug 2010

Sep 2010

Daily Altitude above NGVD 1929, feet

8.0

10.0

12.0

14.0

16.0

18.0 USGS 405743072425701 S 4271. 1

Daily mean altitude above NGVD 1929

Water level shown on map (NGVD 1929)

EXPLANATION

Oct 2010

Date

Oct 2009

Nov 2009

Dec 2009

Jan 2010

Feb 2010Mar 2010

Apr 2010

May 2010

June 2010

July 2010

Aug 2010Sep 2010

Daily Altitude above NGVD 1929, feet 14.0

16.0

18.0

20.0

22.0

24.0 USGS 405756072173502 S 8833. 2

Daily mean altitude above NGVD 1929

Water level shown on map (NGVD 1929)

EXPLANATION

Oct 2010

NO DATA