Los Angeles County, CA Water Table Trend
Los Angeles County's groundwater trend, from USGS's own readings
Over 93 years of USGS readings, the well tracking Los Angeles County's aquifer is declining at a typical pace for a declining county: 2.8 ft per decade.
One well stands in for Los Angeles 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 140.3 ft below land surface. Readings span 1926-01-01 to 2018-08-14, 458 measurements from USGS well USGS-343237117582601 (005n010w06n001s), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
Where Los Angeles County ranks
Of the 1,449 US counties with a usable trend, Los Angeles County ranks 1242nd from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 9,757,179 people live in Los Angeles County, California. See the fastest-moving counties guide for how Los Angeles County stacks up against the most extreme cases nationally.
What a declining table means for a well pump
Because Los Angeles 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 Los Angeles 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.