| Sarver, Grant | Lifeguard I | Fire | | |
| Schaefer, Lauren | Firefighter 112 Hours | Fire | 949-644-3113 | |
| Schaeffer, Lauren | Recreation Coordinator, Assistant | Recreation & Senior Services | | |
| Schank, Deborah | Administrative Assistant | Community Development | 949-644-3284 | |
| Schilling, Arianna | Recreation Coordinator, Assistant | Recreation & Senior Services | | |
| Schilling, Chloe | Office Assistant | Recreation & Senior Services | 949-644-3162 | |
| Schmillen, Justin | Deputy Recreation & Senior Services Director | Recreation & Senior Services | 949-644-3160 | |
| Schoubye, Samuel | Lifeguard I | Fire | | |
| Schweitzer, Theresa | Public Works Finance/Administrative Manager | Public Works | 949-644-3335 | |
| Schwenk, Jacob | Lifeguard II | Fire | | |
| Scott, Zane | Lifeguard II | Fire | | |
| Scrivner, Christopher | Firefighter Paramedic 112 Hour (On Or After 1-1-2016) | Fire | 949-644-3113 | |
| Seaton, Finley | Lifeguard I | Fire | | |
| Segura, Daniel | Utilities Specialist | Utilities | 949-718-4418 | |
| Seitz, Tyler | Lifeguard I | Fire | | |
| Seo, Leah | Office Assistant | Public Works | 949-644-3331 | |
| Serbeniuk, Gary | Recreation Leader, Senior | Recreation & Senior Services | | |
| Setter, Gracie | Human Resources Specialist | Human Resources | 949-644-3304 | |
| Shank, David | Firefighter Paramedic 112 Hour (Before 1-1-2016) | Fire | 949-644-3104 | |
| Shapirshteyn, Bryan | Senior Pool Lifeguard | Recreation & Senior Services | | |
