NAICS PSC rankings
Top PSC paths for NAICS 221320.
Use this ranking when the research starts with NAICS 221320 and you want the strongest service-code pages attached to Sewage Treatment Facilities before moving into deeper intersections.
NAICS PSC rankings
Top PSC paths
These NAICS-scoped rankings are useful when you want a cleaner entry point than the full code page and a faster pivot into geography or service-lane research.
PSC S119
2 visible recipients · UTILITIES- OTHER
PSC S114
3 visible recipients · UTILITIES- WATER
PSC R418
3 visible recipients · SUPPORT- PROFESSIONAL: LEGAL
PSC Z222
1 visible recipients · MAINT-REP-ALT/HWYS-RDS-STS-BRDGS-RA
PSC X111
2 visible recipients · LEASE/RENTAL OF OFFICE BUILDINGS
PSC 4630
1 visible recipients · SEWAGE TREATMENT EQUIPMENT
PSC B516
1 visible recipients · SPECIAL STUDIES/ANALYSIS- ANIMAL/FISHERIES
PSC AB91
1 visible recipients · R&D- COMMUNITY SERVICE/DEVELOPMENT: OTHER (BASIC RESEARCH)
PSC Q999
1 visible recipients · MEDICAL- OTHER
PSC R615
1 visible recipients · SUPPORT- ADMINISTRATIVE: BACKGROUND INVESTIGATION
PSC S205
2 visible recipients · HOUSEKEEPING- TRASH/GARBAGE COLLECTION
PSC R499
1 visible recipients · SUPPORT- PROFESSIONAL: OTHER
Other NAICS ranking views
Move around NAICS 221320
Use sibling ranking layers when you want to stay inside the same industry lane but switch between geography and service-code analysis.
Directory graph
Move into full directory hubs
Use the NAICS-specific ranking page as a shortcut, then move back into the broader NAICS, state, PSC, and top-list hubs when you want wider browse coverage.