The list of plumbing and fire protection abbreviations used in a set of architectural drawings varies from office to office. Be sure to check the front section of the construction drawing set for the abbreviations used within.
| AP | Access Panel |
| BT | Bath Tub |
| BWV | Back Water Valve |
| CFH | Cubic Feet per Hour |
| CFM | Cubic Feet per Minute |
| CI | Cast Iron |
| CLDI | Cement Lined Ductile Iron |
| CO | Cleanout |
| CONC | Concrete |
| CP | Chrome Plated |
| CTE | Connect to Existing |
| CW | Cold Water |
| CWR | Cold Water Return |
| CWS | Cold Water Supply |
| DCVA | Double Check Valve Assembly |
| DF | Drinking Fountain |
| DIA | Diameter |
| EL or ELEV | Elevation |
| EWC | Electrical Water Cooler (Drinking Fountain) |
| FCO | Floor Cleanout |
| FEC | Fire Extinguisher Cabinet |
| FHV | Fire Hose Valve |
| FLR | Floor |
| FP | Fire Protection |
| FPWH | Freeze Proof Wall Hydrant |
| FS | Flow Switch |
| FT | Foot or Feet |
| FV | Flush Valve |
| GALV | Galvanized |
| GCO | Ground Clean Out |
| GI | Grease Interceptor |
| GPF | Gallons per Flush |
| GPM | Gallons per Minute |
| HC | Handicapped |
| HW | Hot Water |
| HWR | Hot Water Return |
| HWS | Hot Water Supply |
| ID | Inside Diameter |
| INV | Invert |
| IW | Indirect Waste |
| MECH | Mechanical |
| MSB | Mop Service Basin |
| NC | Normally Closed |
| NO | Normally Open |
| OD | Outside Diameter |
| OED | Open End Drain |
| PIV | Post Indicator Valve |
| PLBG | Plumbing |
| PSI | Pounds per Square Inch |
| RPBP | Reduced Pressure Backflow Preventer |
| SA | Shock Absorber |
| SD | Sanitary Drain |
| SH or SHWR | Shower |
| SK | Sink |
| SS | Soil Stack or Stainless Steel |
| TLT | Toilet |
| TS | Tamper Switch |
| TW | Tempered Water |
| TYP | Typical |
| U | Urinal |
| V | Vent |
| VB | Vacuum Breaker |
| VFD | Variable Frequency Drive |
| VS | Vent Stack |
| VTR | Vent Through Roof |
| W | Waste |
| WC | Water Closet (Toilet) |
| WH | Wall Hydrant |
| WS | Waste Stack |
