City of Torrance NPDES Contacts For questions about Hazardous Materials: 310-618-2973 For questions about the NPDES inspection program: 310-781-7644. To notify the city about illegal dumping into the storm drain: 310-618-5929 or 310-781-7042 To review NPDES inspection forms and files: 310-618-2870 To report a clogged storm drain: 310-781-6900