oEPA National Primary Drinking Water Standards
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f t^iji,* f 4*- ' 'A, d *
Chlordane
Chlorine (as Cl2)
Chlorine dioxide (as ClOg)
Chlorite
Chlorobenzene
Chromium (total)
Copper
Cryptosporidium
Cyanide (as free cyanide)
2,4-D
Dalapon
1 ,2-Dibromo-3-chloropropa
ne (DBCP)
o-Dichlorobenzene
p-Dichlorobenzene
1,2-Dichloroethane
1,1-Dichloroethylene
cis-1,2-Dich!oroethylene
trans-1 ,2-Dichloroethylene
Dichloromethane
1 ,2-Dichloropropane
Di(2-ethylhexyl) adipate
Di(2-ethylhexyl) phthalate
Dinoseb
Dioxin (2,3,7,8-TCDD)
Diquat
I Endothall
" "'P'-INM. 	 JMNM..,...-.^.—
0.002
MRDL=4.01
MRDL=0.81
1.0
0.-1
0,1
TT7;
Action
Level =
1.3
TT3
0.2
0.07
0.2
0.0002
0.6
0.075
0.005
0.007
0.07
0.1
0.005
0.005
0.4
0.006
0.007
0.00000003
0.02
0.1

Liver or nervous system problems; increased
risk of cancer
Eye/nose irritation; stomach discomfort
Anemia; infants & young children: nervous
system effects
Anemia; infants & young children: nervous
system effects
Liver or kidney problems
Allergic dermatitis
Short term exposure: Gastrointestinal
distress. Long term exposure: Liver or kidney
damage. People with Wilson's Disease
should consult their personal doctor if the
amount of copper in their water exceeds the
action level
Gastrointestinal illness (e.g., diarrhea,
vomitinq, cramps)
Nerve damage or thyroid problems
Kidney, liver, or adrenal gland problems
Minor kidney changes
Reproductive difficult es; increased risk of
cancer
Liver, kidney, or circulatory system problems
Anemia; liver, kidney or spleen damage;
changes in blood
Increased risk of cancer
Liver problems
Liver problems
Liver problems
Liver problems; increased risk of cancer
Increased risk of cancer
Weight loss, live problems, or possible
reproductive difficulties
Reproductive difficulties; liver problems;
increased risk of cancer
Reproductive difficulties
Reproductive difficulties; increased risk of
cancer
Cataracts
Stomach and intestinal problems

Residue of banned termiticide
Water additive used to control
microbes
Water additive used to control
microbes
Byproduct of drinking water
disinfection
Discharge from chemical and
agricultural chemical factories
Discharge from steel and pulp
mills; erosion of natural deposits
Corrosion of household plumbing
systems; erosion of natural
deposits
Human and feca! animal waste
Discharge from steel/metal
factories; discharge from plastic
and fertilizer factories
Runoff from herbicide used on
row crops
Runoff from herbicide used on
rights of way
Runoff/leaching from soil
fumigant used on soybeans,
cotton, pineapples, and orchards
Discharge from industrial
chemical factories
Discharge from industrial
chemical factories
Discharge from industrial
chemical factories
Discharge from industrial
chemical factories
Discharge from industrial
chemical factories
Discharge from industrial
chemical factories
Discharge from drug and
chemical factories
Discharge from industrial
chemical factories
Discharge from chemical
factories
Discharge from rubber and
chemical factories
Runoff from herbicide used on
soybeans and vegetables
Emissions from waste
incineration and other
combustion; discharge from
chemical factories
Runoff from herbicide use
Runoff from herbicide use

zero
MRDLG=41
MRDLG=0.81
0.8
0.1
0.1
1.3
zero
0.2
0,07
0.2
zero
0.6
0.075
zero
0.007
0.07
0.1
zero
zero
0.4
zero
0.007
zero
0,02
0.1
LEGEND
   D     I  Dinsinfeclant
            Disinfection Byproduct
Inorganic Chemical
Microorganism
Organic Chemical
Radlonuclldes

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                                      0.002
             Liver problems^
                                            Residue of banned insecticide
                                     0.002
       Epichlorohydrin
  TT8
Increased cancer risk, and over a long period
of time, stomach problems
Discharge from industrial
chemical factories; an impurity of
some water treatment chemicals
 zero
       Ethylbenzene
  0.7
Liver or kidneys problems
Discharge from petroleum
refineries
  0.7
       Ethylene dibromide
0.00005
Problems with liver, stomach, reproductive
system, or kidneys; increased risk of cancer
Discharge from petroleum
refineries
                                                                                              zero
       Fluoride
  4.0
Bone disease (pain and tenderness of the
bones); Children may get mottled teeth
Water additive which promotes
strong teeth; erosion of natural
deposits; discharge from fertilizer
and aluminum factories
  4.0
       Giardia lamblia
  TT3
Gastrointestinal illness (e.g., diarrhea,
vomiting, cramps)	
Human and animal fecal waste
                                                                                                                                   zero
       Glyphosate
  0.7
Kidney problems; reproductive difficulties
Runoff from herbicide use
  0.7
       Haloacetic acids (HAAS)
 0,060
Increased risk of cancer
Byproduct of drinking water
disinfection
       Heptachlor
0.0004
Liver damage; increased risk of cancer
Residue of banned termiticide
                                                                                              zero
       Heptachlor epoxide
 0.0002
Liver damage; increased risk of cancer
Breakdown of heptachlor
                                                                                              zero
       Heterotrophic plate count
       (HPC)
  TT3
HPC has no health effects; it is an analytic
method used to measure the variety of
bacteria that are common in water. The lower
the concentration of bacteria in drinking
water, the better maintained the water
system is.	
HPC measures a range of
bacteria that are naturally present
in the environment
  n/a
       Hexachlorobenzene
 0.001
Liver or kidney problems; reproductive
difficulties; increased risk of cancer
Discharge from metal refineries
and agricultural chemical
factories
                                                                                              zero
       Hexachlorocyclopentadien
      A
       Lead
  0.05
Kidney or stomach problems
Discharge from chemical
factories
 0.05
  TT7;
 Action
 Level =
 0.015
Infants and children: Delays in physical or
mental development; children could show
slight deficits in attention span and learning
abilities; Adults: Kidney problems; high blood
pressure	
Corrosion of household plumbing
systems; erosion of natural
deposits
                                                                                                                                   zero
       Legionella
  TT3
Legionnaire's Disease, a type of pneumonia
Found naturally in water;
multiplies in heating systems
 zero
       Lindane
 0.0002
Liver or kidney problems
Runoff/leaching from insecticide
used on cattle, lumber, gardens
0,0002
       Mercury (inorganic)
 0.002
Kidney damage
Erosion of natural deposits;
discharge from refineries and
factories; runoff from landfills and
croplands	
 0.002
       Methoxychlor
  0.04
Reproductive difficulties
Runoff/leaching from insecticide
used on fruits, vegetables, alfalfa,
livestock
 0.04
       Nitrate (measured as
       Nitrogen)
   10
Infants below the age of six months who drink
water containing nitrate in excess of the MCL
could become seriously ill and, if untreated,
may die. Symptoms include shortness of
breath and blue-baby syndrome.	
Runoff from fertilizer use;
leaching from septic tanks,
sewage; erosion of natural
deposits
  10
       Nitrite (measured as
       Nitrogen)
             Infants below the age of six months who drink
             water containing nitrite in excess of the MCL
             could become seriously ill and, if untreated,
             may die. Symptoms include shortness of
             breath and blue-baby syndrome.	
                                            Runoff from fertilizer use;
                                            leaching from septic tanks,
                                            sewage; erosion of natural
                                            deposits
LEGEND

   D    |  Disinfectant
          Disinfection Byproduct
           Inorganic Chemical


           Microorganism
                                 Organic Chemical

                                 Radionuclides

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^'Office of Water (4<
  EPA816-F-03-016
  www, epa. gov/spfewater
  June 2003

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