Our township (NJ) did a reassessment of everyone's property a few years ago. That didn't affect us much (-1.4%), but I've seen other towns where it caused people's taxes to jump 20-30% in a year.
Also, look at the tax history. The chart below shows our tax history since 2005, and you can see how much it went up. The reassessment actually lowered our taxes by 1.4%, which I'd forgotten. The assessed value of the house is not the market value - market value is probably $100k over the assessed value. I can't see us staying in NJ once we retire :)
YEAR PROPERTY TAXES CHANGE TAX ASSESSMENT CHANGE
2015 $10,445 +2.4% $295,400 --
2014 $10,197 -1.4% $295,400 +67.7%
2012 $10,344 +7.8% $176,100 --
2011 $9,597 -5.5% $176,100 --
2010 $10,154 +2.1% $176,100 --
2009 $9,948 +4.5% $176,100 --
2008 $9,523 +2.9% $176,100 --
2007 $9,254 +8.9% $176,100 --
2006 $8,495 +9.4% $176,100 --
2005 $7,762 -- $176,100 --