13.-1120. Phreatic aquifer- Water table aquifer.

13.- WASH Glossary.
13.-1119. Photosynthesis.
13.-1118. Photolysis.
13.-1117. Photocatalysis.
13.-1116. Phosphorus.
13.-1115. Phenol red.
13.-1114. Pharmaceutical waste.
13.-1113. Pharmaceutical residues.
13.-1112. pH.
13.-1111. PET.
13.-1110. Pesticide.
13.-1109. Pest.
13.-1108. Personal protective equipment - ( PPE ).
13.-1107. Persistent organic pollutants - ( POPs ).
13.-1106. Persian wheel.
13.-1105. Permselective.
13.-1104. Permits.
13.-1103. Permeate.
13.-1102. Permeable, pervious.
13.-1101. Permeability.
13.-1100. Permafrost.
13.-1099. Peri-urban.
13.-1098. Perforated plastic sleeves.
13.-1097. Perfectly competitive market.
13.-1096. Percolation.
13.-1095. Perched aquifer.
13.-1094. Percentile.
13.-1093. Per capita use.
13.-1092. Pelagic.
13.-1091. Peak flow.