TABLE ll-l. Surface Water Criteria for Public Water Supplies 



Permissible Desirable 



Constituent or characteristic criteria criteria Paragraph 



Physical: 



Color (color units) 75 <10 1 



Odor Narrative Virtually absent 2 



Temperature * do Narrative 3 



Turbidity do Virtually absent 4 



Microbiological: 



Coliform organisms 10,000/100 mr <100/100 mP 5 



Fecal coliforms 2,000/100 ml' <20/100 mP 5 



Inorganic chemicals: (mg/l) (mg/l) 



Alkalinity Narrative Narrative 6 



Ammonia 0.5 (as N) <0.01 7 



Arsenic * 0.05 Absent 8 



Barium * 1.0 do 8 



Boron * 1.0 do 9 



Cadmium * 0.01 do 8 



Chloride * 250 <25 8 



Chromium,* hexavalent 0.05 Absent 8 



Copper * 1.0 Virtually absent 8 



Dissolved oxygen >4 (monthly mean) Near saturation 10 



>3 (individual sample) 



Fluoride * Narrative Narrative 11 



Hardness * do do 12 



Iron (filterable) 0.3 Virtually absent 8 



Lead * 0.05 Absent 8 



Manganese * (filterable) 0.05 ^ do 8 



Nitrates plus nitrites* 10 (as N) Virtually absent 13 



pH (range) 6.0-8.5 Narrative 14 



Phosphorus* Narrative do 15 



Selenium * 0.01 Absent 8 



Silver * 0.05 do 8 



Sulfate * 250 <50 8 



Total dissolved solids * 500 <200 16 



(filterable residue). 



Uranyl ion * 5 Absent 17 



Zinc * 5 Virtually absent 8 



Organic chemicals: 



Carbon chloroform extract * (CCE) 0.15 <0.04 18 



Cyanide * 0.20 Absent 8 



Methylene blue active substances * 0.5 Virtually absent 19 



Oil and grease * Virtually absent Absent 20 



Pesticides: 



Aldrin * 0.017 do 21 



Chlordane * 0.003 do 21 



DDT * 0.042 do 21 



Dieldrin * 0.017 do 21 



Endrin * 0.001 do 21 



Heptachlor * 0.018 do 21 



Heptachlor epoxide * 0.018 do 21 



Lindane * 0.056 do 21 



Methoxychlor * 0.035 do 21 



Organic phosphates plus 0.1 ■ do 21 



carbamates.* 



Toxaphene * 0.005 do 8 



Herbicides: 



2,4-D plus 2,4,5-T, plus 2,4,5-TP * 0.1 do 21 



Phenols * 0.001 do 8 



Radioactivity: (pc/i) (pc/i) 



Gross beta * 1,000 <100 8 



Radium-226 * 3 <1 8 



Strontium-90 * 10 <2 8 



' The defined treatment process has little effect on this limit may be r.elaxed if fecal coliform concentration does not 



constituent. exceed the specified limit. 



^Microbiological limits are monthly arithmetic averages = As parathion in cholinesterase inhibition. It may be neces- 



based upon an adequate number of samples. Total coliform sary to resort to even lower concentrations for some com- 



pounds or mixtures. See par. 21. 



20 



