| Abbreviation | Definition |
|---|---|
| PRTP | Park Ranger Training Program |
| PRTR | Pollutant Release and Transfer Register |
| PRV | Pressure Reducing Valve |
| PRW | Pesticide Residue Workshop |
| PRW | Plant Redues and Waste |
| PSD | Promote Sustainable Development |
| PSDC | Pump Station Design Capacity |
| PSE | Policy Systems Environmental |
| PSEP | Process Safety and Environmental Protection |
| PSI | Pollution Standards Index |
| PSIS | Poison Substance Information System |
| PST | Pacific Salmon Treaty (US-Can) |
| PST | Primary SettlemenT |
| PSW | Provincially Significant Wetland |
| PSWID | Pine-Strawberry Water Improvement District |
| PTTW | Permit to Take Water |
| PUD | Poly-Urethane Dispersion |
| PUESI | Partnership on Urban Environmental Sustainability Initiative |
| PULSED | Puttalam Union for Literacy Social Environmental Development |
| PW | Potable Water |