EPA · Maryland · discharge permits by parameter

Flow, in conduit or thru treatment plant in Maryland

• 480Permits carrying a limit
• 71With a recorded exceedance
• 40,755Nationwide

Permits

Other parameters in Maryland

• Solids, total suspended531
• pH498
• Chlorine, total residual265
• Flow199
• BOD, 5-day, 20 deg. C155
• Nitrite + Nitrate total [as N]145
• Nitrogen, total [as N]141
• Oxygen, dissolved [DO]131
• Zinc, total [as Zn]129
• Nitrogen, ammonia total [as N]117
• Phosphorus, total [as P]116
• Copper, total [as Cu]105
• pH change [range]102
• Oil & Grease98
• Lead, total [as Pb]97
• Iron, total [as Fe]91
• E. coli85
• Coliform, fecal general85
• Solids, settleable83
• Nitrogen, organic total [as N]82
• Flow, total77
• Temperature, water deg. fahrenheit72
• Cyanuric acid71
• Turbidity61
• Nitrogen, Kjeldahl, total [as N]55
• Benzene53
• Toluene51
• Petrol hydrocarbons, total recoverable50
• Phosphate, ortho [as P]46
• Aluminum, total recoverable45
• Temp. diff. between up/down stream deg. F42
• Turbidity, lab, NTU38
• Chloride [as Cl]35
• Methyl tert-butyl ether [MTBE]33
• Solids, total dissolved33
• Hardness, total [as CaCO3]32
• Nitrogen, nitrate total [as N]31
• Copper, total recoverable31
• Silver, total [as Ag]30
• Ethylbenzene29
• Chemical Oxygen Demand [COD]28
• Phosphate, total [as PO4]27
• Naphthalene25
• Nitrogen, nitrite total [as N]24
• Benzene, ethylbenzene, toluene, xylene combination23
• Phosphorous, in total orthophosphate22
• Ethylbenzene22
• Oil and grease22
• Xylene [mix of m+o+p]21
• Suspended Solids, Total21
• BTEX19
• Manganese, total [as Mn]19
• Aluminum, total [as Al]19
• Nickel, total [as Ni]19
• Copper, dissolved [as Cu]18
• Oxygen demand, chem. [COD], dissolved18
• Lead, total recoverable17
• Bromine, reported as the element17
• Xylenes [total], dry weight17
• Poly[hexamethylenebiguanide] hydrochloride16

Flow, in conduit or thru treatment plant nationwide