Oil (Cont'd) 



wildlife, p. 96 

 Oil industry 



condensers, p. 203 



industrial water, p. 187 



refining, p. 202 



surface waters, p. 203, 206 



water consumption, p. 188, 202 



water properties, p. 203 



water quality requirements, p. 203 



water reuse, p. 202 



water treatment, p. 203 



water utilization, p. 202 

 Organic compounds 



public water supplies, p. 20 

 Organic pesticides concentration 



farmstead water supplies, p. 116, 124 



see also Pesticides 

 Osmotic pressure 



irrigation eflfects, p. 147 

 Outdoor recreation see Recreation 



Outdoor Recreation Resources Review Commission, p. 7 

 Oxygen see Biochemical oxygen demand; Chemical oxy- 

 gen demand; Dissolved oxygen 

 Oysters 



oil, p. 73 



taste, p. 77 



Parathion 



public water supplies, p. 25 



toxicity, p. 37 

 Pasteurized Milk Ordinance, USPHS 



dairy sanitation requirements, p. 120 

 Pathogenic bacteria 



irrigation water, p. 160 



shellfish, p. 89 

 PBI see Pearl Benson Index 

 Pearl Benson Index 



pulp wastes, p. 90 

 Pecos River Basin 



dissolved solids, p. 765 

 Permeability 



irrigation effects, p. 170 



Langelier index, p. 170, 171 



soils, p. 170 

 Perthane 



toxicity, p. 37, 83 

 Pesticide residues 



carnivores, p. 8 1 



herbicides, p. 25 



herbivores, p. 81 



irrigation water, p. 156, 157 



plant growth, p. 156, 157 



public water supplies, p. 25 



supplemental irrigation, p. 175 



water analysis, p. 178 

 Pesticides 



acute toxicity data, p. 37 



aquatic environment, p. 82 



classification, p. 83 



crustaceans, p. 82 



estuaries, p. 82 



fish toxicity, p. 25 



fresh water recommendation, p. 62 



fresh water toxicity, p. 35 



public health, p. 25 



public water supplies, p. 20 



sea water, p. 82 



stock water, p. 137 



wildlife, p. 97 



Pesticides (Cont'd) 

 see also Algicides; Defoliants; Fungicides; Herbicides; 

 Insecticides 

 Petroleum products see Oil 

 pH see Hydrogen ion concentration 

 Phaeophyta 



heavy metals, p. 84 

 Phelps Index 



fecal coliform levels, p. 22 

 Phenols 



sea water, p. 89 

 tainting substances, p. 49 

 toxicity, p. 89 



waste water (pollution), p. 89 

 Phosphorus 



Asterionella, p. 55 



Federal Water Pollution Control Administration, Divi- 

 sion of Pollution Surveillance, p. 24 

 major sources, p. 53 

 nitrogen ratio, p. 53 

 public water supplies, p. 23, 24 

 streams, p. 34 

 water pollution, p. 24 

 Photosynthetic oxygen 



color, p. 48 

 Phthalic acid compounds see Botanicals 

 Physa heterostropha 

 oil toxicity, p. 46 

 Phytoplankton, p. 36 

 Phytotoxicity 



aluminum, p. 152 

 arsenic, p. 152 

 beryllium, p. 153 

 bicarbonates, p. 156 

 boron, p. 153, 153 

 cadmium, p. 153 

 chlorides, p. 155 

 chromium, p. 153 

 cobalt, p. 153 

 copper, p. 1 53 

 fluorides, p. 154 

 iron, p. 154 



irrigation effects, p. 151, 152 

 irrigation water, p. 177 

 lead, p. 154 

 lithium, p. 154 

 manganese, p. 154 

 molybdenum, p. 154 

 nickel, p. 154 

 plant growth, p. 151, 152 

 selenium, p. 154 

 tin, p. 154 

 titanium, p. 154 

 tungsten, p. 154 

 vanadium, p. 154 

 zinc, p. 155 

 see also Toxicity 

 Pichloram 



irrigation water, p. 159 

 Picornaviruses 



water pollution sources, p. 141 

 Pig iron, p. 205 

 Pithophora 



chemical composition, p. 55 

 Plankton 



heavy metals, p. 84 

 nutrients, p. 51 

 Plant growth 



evapotranspiration, p. 148 

 irrigation water, p. 146, 147 



226 



