Chanele R.
Yelp
One of the largest and most established sparkling wine producers in the region, this company gets five stars for many reasons, but most of all for making Zéro - a sparkling wine without sugar for the crispest, best sparkling around.
In addition to tastings (of many delicious offerings), they offer tours of their facility with education on how wine is made in English and French. Note that the facility you tour is not their main production facility, but you still get the idea. This is a must stop for anyone in Saumur looking to try sparkling wines!