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USGS Water-Year Summary 2024
404932073055902 S 33380. 1
Northern Atlantic Coastal Plain aquifer system
Magothy Aquifer
Magothy Aquifer
LOCATION - Lat 40°49'32", long 73°05'59" referenced to North American Datum of 1927, Suffolk County, NY, Hydrologic Unit 02030202, at Duncan Avenue and Portion Road, in pumping center, in recorder shelter, Lake Ronkonkoma.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 855 ft. Upper casing diameter 4 in; top of first opening 840 ft, bottom of last opening 850 ft. Datum of gage is NGVD of 1929.
DATUM - Land-surface datum is 133.5 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of casing, 2.13 ft above land-surface datum, 135.63 ft above National Geodetic Vertical Datum of 1929, Mar. 5, 1970 to Mar. 31, 2016; Top of blue insert in 4" Steel well, North Side, 135.67 ft above National Geodetic Vertical Datum of 1929, Mar. 21, 2016 to Mar. 14, 2024; Top of blue insert in 4" Steel well, North Side, 135.623 ft above National Geodetic Vertical Datum of 1929, Mar. 14, 2024 to present.
PERIOD OF RECORD - October 1968 to current year. Unpublished records for October 1968 to September 1975 are available in files of the U.S. Geological Survey.
GAGE - Water-level recorder installed August 1986; 15-minute recording interval. Periodic manual measurements made by USGS personnel.
REMARKS - Water level affected by nearby pumping. Cellular water-level telemeter at station.
EXTREMES FOR PERIOD OF RECORD - Highest water level recorded, 54.81 ft above NGVD of 1929, May 14, 15, 2010; lowest recorded, 43.06 ft above NGVD of 1929, Aug. 28, 2017.
