Washoe County, NV Water Table Trend
Washoe County, NV: what the water table is actually doing
Washoe County's long-term well puts the trend at 0.8 ft per decade, declining, slower than most declining counties, based on 16 measurements since 1954.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Washoe County's source well, in detail
Depth to water at the last reading was 40.1 ft below land surface. Readings span 1954-09-23 to 2026-03-12, 16 measurements from USGS well USGS-410208119571301 (016 N37 E18 34dadc1 Usblm), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Washoe County compares nationally
Washoe County sits at rank 1042nd of 1,449 ranked counties, ordered rising-to-declining, so a low number means a rising water table and a high one means fast decline. Washoe County, Nevada is home to about 507,280 people. See the fastest-moving counties guide for how Washoe County stacks up against the most extreme cases nationally.
If you own a well in Washoe County
A dropping water table means a residential pump has to reach deeper and work harder, which shortens its life. In Washoe County, that trend is real, not assumed: 0.8 ft per decade over 72 years.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Washoe County can be stable in depth and still worth testing for quality, or declining and still test clean, the two are measured separately, and only a direct test settles the second one.