New Castle County, DE Water Table Trend
New Castle County, DE: what the water table is actually doing
New Castle County's representative monitoring well shows depth to water declining at a typical pace for a declining county, a fitted trend of 2.8 ft per decade over 62 years of readings.
One well stands in for New Castle County's whole aquifer here, the honest simplification every page on this site carries.
What the well actually measured
The most recent reading put water 141.3 ft below land surface. Readings span 1954-09-20 to 2016-12-14, 249 measurements from USGS well USGS-393551075375301 (Dc53-07), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
Where New Castle County ranks
Of the 1,449 US counties with a usable trend, New Castle County ranks 1239th from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 588,093 people live in New Castle County, Delaware. See the fastest-moving counties guide for how New Castle County stacks up against the most extreme cases nationally.
What a declining table means for a well pump
Because New Castle County's water table is actually declining, not just a general worry, a well owner here should consider comparing home-warranty plans that cover well-pump failure before one happens.
A dropping table says nothing about water quality
Whether New Castle County's water table is rising or falling is independent of what's actually in the water. Depletion can concentrate naturally-occurring minerals, so it's worth checking directly with a water test rather than assuming a depth trend says anything about quality.