Data security breach impacts City of Sioux City customers. SIOUX CITY – A data security breach has potentially impacted more than 3,500 City of Sioux City customer utility and parking accounts. SIOUX CITY – Another local eye clinic has been victimized by a malware attack on its computer systems. If you’re feeling generous this holiday season, particularly if you’re a senior, be wary of scammers who are looking to take advantage of that…. Third-party company: Click2Gov.