Ontario County, NY Water Table Trend
Is the water table dropping in Ontario County, NY?
Over 75 years of USGS readings, the well tracking Ontario County's aquifer is declining at a typical pace for a declining county: 1.5 ft per decade.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Ontario County's source well, in detail
Depth to water at the last reading was 43.3 ft below land surface. Readings span 1947-01-01 to 2021-08-16, 10 measurements from USGS well USGS-425829077055901 (Ot 99), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Ontario County compares nationally
Ontario County sits at rank 1147th 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. Ontario County, New York is home to about 113,012 people. See the fastest-moving counties guide for how Ontario County stacks up against the most extreme cases nationally.
If you own a well in Ontario County
A dropping water table means a residential pump has to reach deeper and work harder, which shortens its life. In Ontario County, that trend is real, not assumed: 1.5 ft per decade over 75 years.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Ontario 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.