While not dangerous (at least mostly) an earthquake occurring in an area that does not get them frequently will create some disturbance in wells.
This is an issue because it is unusual for us to have earthquakes, yet last year we had 2.
Earthquakes in Connecticut
Aug 23, 2011March 24, 2011
November 30, 2010June 23, 2010
March 11, 2008
August 26, 2003
June 16, 2000
January 9, 1992
Oct 28, 1991
From 1668 to 2007 Connecticut has had 137 earthquakes
opening new veins of water and losing iron in old veins is expected.
They clear up - over time, but with treatment systems, any iron bacteria will raise havoc!