... (EPA 440/ 5-8 4-0 33), Cadmium (EPA 440/ 5-8 4-0 32), Chromium (EPA 440/ 5-8 4-0 29), Copper (EPA 440/ 5-8 4-0 31), Cyanide (EPA 440/ 5-8 4- 028), Lead (EPA 440/ 5-8 4-0 27), Nickel (EPA 440/ 5-8 6- 0 04), Pentachlorophenol ... in lakes and rivers contaminated with sewage and animal wastes. Note: National primary drinking water regulations (NPDWRs, or primary standards) are legally enforceable standards thatapply ... load of manganese in anaverage adult is about 12 mg. Health problems in humans may arise from de cient and e xcessiveintakes of manganese. Thus, any quantitative risk assessment for manganese...