Bald Knob Water Filter Plant 550 S Main St Bald Knob, AR 72010 Phone : (501) 724-6442 Business Category Government Offices-City Village & Twp Legislative Bodies Bald Knob City Of--water & Sewer System, Filter Plant Bald Knob, AR 72010 Phone : (501) 724-6442 Business Category Government Offices-City Village & Twp Government Offices State & Local Government Offices & Public Schools