Onslow Quarry 18
North Carolina Division of Water Resources
Located in Onslow County, North Carolina, this groundwater monitoring location is associated with a water well in the Castle Hayne aquifer.
Well Construction
| Depth | Description | |
|---|---|---|
| -2.46-37.0 ft | 2.0 in diameter pvc casing | |
| 37.0-47.0 ft | 2.0 in diameter none screen |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-25.0 ft | - | Surficial Aquifer |
| 25.0-36.0 ft | - | Castle Hayne CU |
| 36.0-238.0 ft | - | Castle Hayne Aquifer |
| 238.0-278.0 ft | - | Peedee CU |
| 278.0-476.0 ft | - | Peedee Aquifer |
| 476.0-534.0 ft | - | Black Creek CU |
| 534.0-668.0 ft | - | Black Creek Aquifer |
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Agency North Carolina Department of Environmental Quality Division of Water Resources Site Name Onslow Quarry 18 Site Number W26C2 Site Type WELL Lat/Long (NAD83) 34.8319, -77.5439 Well Depth 47 Feet Elevation (NAVD88) 52.743 ft Latitude 34.831947 Longitude -77.543871 Local Aquifer Name Castle Hayne (None) National Aquifer Name Castle Hayne aquifer (N400CSLHYN) Aquifer Type CONFINED Water-Level Well Type Trend Water-Level Well Characteristics Background Water Quality Network water_quality_network Additional info Link 1 -
Activity Start Date Activity Start Time Characteristic Name Measure Value Units Detection Limit Value Type Sample Fraction Method Name Analytical Method System Sample Method ID Sample Method ID Context Sample Method Name Activity Type Code Data Provided By Unknown 00:00:00 EST None None None Unknown Unknown Unknown NCDWR Unknown Unknown NCDWR -
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How do we calculate statistics?
Overall Water Level Statistics (Depth to water, feet below land surface) Lowest Water Level Median Water Level Highest Water Level First Measurement Date Last Measurement Date Number of Measurements Years of Record Latest Value Latest Percentile 44.97 41.68 33.94 2004-10-20 2026-02-17 1335 21.3 42.84 35.00 Statistics Calculated 2026-02-26 Monthly Water Level Statistics (Depth to water, feet below land surface) Month Lowest Median 10th Percentile 25th Percentile 50th Percentile 75th Percentile 90th Percentile Highest Median Number of Measurements Years of Record Feb 44.60 44.23 42.88 42.30 39.04 38.81 38.79 19 19 May 43.00 42.99 42.58 41.70 38.67 38.08 37.84 16 16 Aug 43.36 42.68 40.83 39.33 37.94 36.89 36.76 18 18 Nov 43.75 43.69 42.37 41.95 38.15 37.12 36.37 20 20 Statistics Calculated 2026-02-26 -
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