I finally got a response to my query about the tidal movements of water in wells, which I post below it its entirety. I've not had a chance to look at the links, but it appears there are two kinds of tides, earth-tide and ocean-tide. I was almost fit to be tide!
Instead I'm TEd
Sorry for the delay in my response, I was in a meeting down in Florida last week. The diurnal fluctuations are related to earth tides and are not related to ocean tides. Below is some additional information that may interest you:
Merritt, Michael, L., 2004, Estimating Hydraulic Properties of the Floridan Aquifer System by Analysis of Earth-Tide, Ocean-Tide, and Barometric Effects, Collier and Hendry Counties, Florida: U.S. Geological Survey Water-Resources Investigations Report 03-4267, 70 p.
http://water.usgs.gov/pubs/wri/wri034267/ Earthquake and Wells
http://water.usgs.gov/pubs/fs/fs-096-03/ Pennsylvania Earthquake
http://pa.water.usgs.gov/reports/wri99-4170/index.html Hope this helps
Dave
David L. Nelms
District Ground-Water Specialist
U.S. Geological Survey
1730 East Parham Road
Richmond, VA 23228
(804) 261-2630
(804) 261-2659 (Fax)
dlnelms@usgs.gov
http://va.water.usgs.gov/ 
