According to a Facebook post it happened when freezing rain caused an issue with a fitting on one of the regular unleaded fuel tanks. The problem was detected early, but not before some customers had already pumped the fuel.
Trig’s says they have contacted those customers and are working with them to resolve any issues they are experiencing as a result of the water. In the meantime Trig’s has stopped selling regular unleaded fuel, but is still offering mid-grade and premium as those tanks were unaffected.
Read more: http://wsau.com/news/articles/2018/feb/22/wausau-trigs-reports-water-in-its-fuel/