ok I germinated a bagseed and is now in my new seedling soil.

Question- the ph of my tap water has always been around 8.2 for the last 2 years now all of a sudden I check the ph today and it is ph 6.8:wtf:, whats up with that? Its not my meter because i checked it with my liquid kit as well. Has anyone else had a dramatic change in tap water ph?