premise: Officials in Gladewater are working to figure out the cause behind elevated levels of lead in the city's drinking water. On Monday, the city sent out a notice advising residents that water tested from June to September had higher than usual levels of lead. Levels that were not a violation under fed
hypothesis: Officials in Gladewater worked hard & figured out the cause behind elevated levels of lead in the city's drinking water.
reason: They haven't figured out the cause yet.