Erosion of natural deposits; runoff from Arsenic (ppb) 10 N/A orchards; runoff from glass and electronics production wastes Decay of asbestos cement water mains; Asbestos (MFL) 7 7 erosion of natural deposits Discharge of drilling wastes; discharge from Barium (ppm) 2 2 metal refineries; erosion of natural deposits Discharge from electrical, aerospace, and defense Beryllium (ppb) 4 4 industries; erosion of natural deposits By-product of drinking Bromate (ppb) 10 0 water disinfection Corrosion of galvanized pipes; erosion of natural deposits; discharge from Cadmium (ppb) 5 5 metal refineries; runoff from waste batteries and paints Discharge from pulp mills; Chromium (ppb) 100 100 erosion of natural deposits Discharge from metal factories; discharge from Cyanide (ppb) 200 200 plastic and fertilizer factories Erosion of natural deposits; additive which promotes strong Fluoride (ppm) 4 4 ■ teeth; discharge from fertilizer and aluminum factories Fluoride also has a secondary contaminant level (SMCL) of 2 ppm. ■ Erosion of natural deposits; discharge from Mercury (ppb) 2 2 refineries and factories; runoff from landfills; runoff from cropland Runoff from fertilizer use; leaching from septic Nitrate (ppm) 10 10 tanks; sewage; erosion of natural deposits Runoff from fertilizer use; leaching from septic Nitrite (ppm) 1 1 tanks; sewage; erosion of natural deposits Rocket propellants, Perchlorate (ppb) 2 N/A fireworks, munitions, flares, blasting agents Discharge from metal refineries; erosion of Selenium (ppb) 50 50 natural deposits; discharge from mines Leaching from sites; Thallium (ppb) 2 0.5 discharge from electronics, glass, and drug factories Synthetic Organic Contaminants
Arsenic (ppb) 10 N/A Erosion of natural deposits; runoff from orchards; runoff from glass and electronics production wastes Asbestos (MFL) 7 7 Decay of asbestos cement water mains; erosion of natural deposits Barium (ppm) 2 2 Discharge of drilling wastes; discharge from metal refineries; erosion of natural deposits Beryllium (ppb) 4 4 Discharge from electrical, aerospace, and defense industries; erosion of natural deposits Bromate (ppb) 10 0 By-product of drinking water disinfection Cadmium (ppb) 5 5 Corrosion of galvanized pipes; erosion of natural deposits; discharge from metal refineries; runoff from waste batteries and paints Chromium (ppb) 100 100 Discharge from pulp mills; erosion of natural deposits Cyanide (ppb) 200 200 Discharge from metal factories; discharge from plastic and fertilizer factories Fluoride (ppm) ■ 4 4 Erosion of natural deposits; additive which promotes strong teeth; discharge from fertilizer and aluminum factories ■ Fluoride also has a secondary contaminant level (SMCL) of 2 ppm. Mercury (ppb) 2 2 Erosion of natural deposits; discharge from refineries and factories; runoff from landfills; runoff from cropland Nitrate (ppm) 10 10 Runoff from fertilizer use; leaching from septic tanks; sewage; erosion of natural deposits Nitrite (ppm) 1 1 Runoff from fertilizer use; leaching from septic tanks; sewage; erosion of natural deposits Perchlorate (ppb) 2 N/A Rocket propellants, fireworks, munitions, flares, blasting agents Selenium (ppb) 50 50 Discharge from metal refineries; erosion of natural deposits; discharge from mines Thallium (ppb) 2 0.5 Leaching from sites; discharge from electronics, glass, and drug factories Synthetic Organic Contaminants
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