| Includes | sanitary waste piping systems, with piping, valves, piping specialties, interceptors, separators, and other components serving a facility site or multiple facilities. |
| Alternate Terms/Abbreviations | SDGS: small-diameter gravity sewers. STEP: septic tank effluent pump |
| Notes | Gray-water system may refer to either small-diameter gravity sewers or septic tank effluent pump systems. Because they convey sanitary sewage and are constructed equal to sanitary sewerage, combined sewers are included under sanitary sewerage gravity piping and force main piping |
| See | 13 47 13 for cathodic protection. 22 13 13 for facility sanitary sewers. 33 05 71 for manholes, chambers, and cleanouts. 33 31 23 for sanitary sewerage force main piping 40 05 78 for air valves used in wastewater service |