Mobile, AL – Officials say 75 of the more than 100 drinking water systems that were affected by Hurricane Ivan were back in normal operations Tuesday. A report from the Alabama Department of Environmental Management says 15 systems are providing safe drinking water, but they're operating using generators. Another 15 systems are in operation, but they're requiring residents to boil water before using it. The ADEM report also says four systems are still having trouble operating, because of problems such as water main breaks or low pressure. The reports says there are several systems that have NOT reported their status to ADEM as well.