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- Parts per thousand (PPT)
The number of “parts” by weight of a substance in thousand parts of water (volume) of a liquid
- Percolation
The movement of water through the subsurface soil layers, usually continuing downward to the groundwater or water table reservoirs
- Pesticides
The general term applied to substances used to control a pest including: weeds, insects, fungi, mites, algae, rodents, etc.
- Petroleum Pollution
The waste produced through the production, use, and disposal of petroleum-based products
- Precipitation
Rain, snow, hail, sleet, dew, and frost
- Pretreatment
- under the Clean Water Act (CWA), the required alteration and/or reduction of certain water pollutants in a waste stream before the wastewater is discharged into a Publicly Owned Treatment Works (POTWs). The purpose of this requirement is to prevent discharges that will reduce the efficiency of the water treatment facility or to treat materials that are not treated or inadequately treated by the facility.
- Treatment of feed water prior to desalting, for example, removal of iron and manganese prior to electro dialysis
- Primary Sludge
The primary treatment in a wastewater treatment plan
- Point source pollution (PS)
Water pollution coming from a identifiable single point as a wastewater treatment plant or manufacturing factory
- Pollution
Undesirable change in the physical, chemical, or biological characteristics of the air, water, or land that can harmfully affect the health, survival, or activities of human or other living organisms
- Polychlorinated biphenyls (PCBs)
A hazardous environmental pollutant that has various industrial applications and tends to accumulate in animal tissues