Tangipahoa Parish, LA Water Table Trend
Tangipahoa Parish's groundwater trend, from USGS's own readings
Tangipahoa Parish's representative monitoring well shows depth to water declining faster than most declining counties, a fitted trend of 8.4 ft per decade over 78 years of readings.
One well stands in for Tangipahoa Parish's whole aquifer here, the honest simplification every page on this site carries.
What the well actually measured
This well is artesian, water currently stands 47.3 ft above land surface (flowing/artesian), not drawn up from a depth. Readings span 1948-04-01 to 2026-06-29, 162 measurements from USGS well USGS-302606090263402 (Ta-258), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
Where Tangipahoa Parish ranks
Of the 1,449 US counties with a usable trend, Tangipahoa Parish ranks 1370th from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 139,823 people live in Tangipahoa Parish, Louisiana. See the fastest-moving counties guide for how Tangipahoa Parish stacks up against the most extreme cases nationally.
What a declining table means for a well pump
Because Tangipahoa Parish'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 Tangipahoa Parish'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.