DRINKING WATER REGULATIONS
AND HEALTH ADVISORIES
by
Office of Water
U.S. Environmental Protection Agency
Washington, D.C.
202-260-7571
SAFE DRINKING WATER HOTLINE
1-800-426-4791
Monday thru Friday, 8:30 AM to 5:00 PM EST
December 1992

-------
LEGEND
Abbreviations column descriptions are:
MCLG -	Maximum Contaminant Level Goal. A non-enforceable
concentration of a drinking water contaminant that is protective of
adverse human health effects and allows an adequate margin of
safety.
MCL
Maximum Contaminant Level. Maximum permissible level of a
contaminant in water which is delivered to any user of a public
water system.
RfD
Reference Dose. An estimate of a daily exposure to the human
population that is likely to be without appreciable risk of deleterious
effects over a lifetime.
DWEL -
Drinking Water Equivalent Level. A lifetime exposure concentration
protective of adverse, non-cancer heaith effects, that ;ssumes all
of the exposure to a contaminant is from a drinking water source.
(*} The codes for the Status Reo and Status HA columns are as follows:
£
D
L
P
T
final
draft
listed for regulation
proposed
tentative
Other codes found in the table include the following:
NA -	not applicable
PS -	performance standard 0.5 NTU - 1.0 NTU
TT -	treatment technique
No more than 5% of the samples per month may be positive. For
systems collecting fewer than 40 samples/month, no more than 1
sample per month may be positive.
guidance
Large discrepancies between Lifetime and Longer-term HA values may occur
because of the Agency's conservative policies, especially with regard to
carcinogenicity, relative source contribution, and less than lifetime
exposures in chronic toxicity testing. These factors can result in a
cumulative UF (uncertainty factor) of 10 to 1000 when calculating a
Lifetime HA.

-------
Drinking Water Standards and Health Advisories
December 1992	pBge i
Chemicals

Standards
StBtUS
HA*
Health Advisories

Status
Beg.*
MCLG
(mg/l)
MCL
(mg/l)
10-kg Child
70-kg Adult
Cancer
Group
One-day
tmg/1).
Ten-day
(mg/l)
Longer-
term
|mg/l).
Longer-
term
(mg/l)
RfD
(nig/kg/
day)
DWEL
(mg/l)
Lifetime
(mg/l)
mg/l at 10"*
Cancer Risk
ORGANICS













Acenaphthene
-
-
-
-
-
-
-
.
0.06
-
.
.

Acifluorfen
-

-
F
2
2
0.1
0.4
0.013
0.4
-
0.1
B2
Acrylamide
F
zero
TT
F
1.5
0.3
0.02
0.07
0.0002
0.007
-
0.001
B2
Acrylonitrile
L
-
-
0


•
-

-
•
0.006
B1 *
Adipates (diethylhexyl)
P
0.5
0.5
-
-
-
-
-
0.7
20
0.5
-
C
Alachlor
F
zero
0.002
F
0,1
0.1
-
-
0.01
0.4
-
0.04
B2
Aldicarb
F
0.001
0.003
F
-
-
-
-
0.0002
0.007
0.001
-
D*
Aldicarb sullone
F
0.001
0.002
F
-
-
-
-
0.0002
0.007
0.001
-
D*
Aldicarb sulfoxide
F
0.001
0.004
F
-
-
-
-
0.0002
0.007
0.001
-
D*
Aldrin
•
-
-
D
. 0.0003
0.0003
0.0003
0.0003
0.00003
0.001
-
0.0002
B2
Ametryn
-
-
-
F
9
9
0.9
3
0.009
0.3
0.06
-
0
Ammonium sulfamate
•
-
-
F
20
20
20
60
0.28
8
2

D
Anthracene (PAH)
-
-
-
-
-
-
-
-
0.3
-
-
-
D
Atrazine
F
0.003
0.003
F
0.1
0.1 .
0.05
0.2
0.005
0.2
0.003
-
C
Baygon
-
-
-
F
0.04
0.04
0.04
0.1
0.004
0.1
0.003
-
C
Bentazon
L
-
-
F
0.3
0.3
0.3
0.9
0.0025
0.09
0.02

D
Benz(a)anthracene (PAH)
P
zero
0.0001
-
-
-
-
-
-

-
-
B2
Benzene
F
zero
0.005
F
0:2
0.2
¦ -
-
-

-
0.1
A
Benzo(a)pvrene (PAH)
F
zero
o.oooa
-
-
-
-

-

-
-
B2*
Benzo(b}fluorar>thene (PAH)
P
zero
0.0002
-
-
-
-
-
-

-
*
B2
Benzo(g,h,i)perylene (PAH)
-
-
-
-
-
-
-
-
-

-
-
D
Benzo(k)fluoranthene (PAH)
P
zero
0.0002
-
-
-
¦ -

-

-
-
B2
bis-2-Chloroisopropyl ether
-
-
¦
F
4
4
4
13
0.04
1
0.3
-
D
Bromacil
L
-
-
F
5
5
3
9
0.13
5
0.09
-
C
Bromobenzene
L
-
-
D
-
-
-
-
-
-
-
•
-
* Under review.
NOTE: Anthracene and Benzo(g,h,i)perylene — not proposed in Phase V.
NOTE: Changes from the last version are noted In Italic and Bold Face print.

-------
Drinking Water Standards and Health Advisories
December 1992	Page 2
Chemicals
Standards
Status
HA*
Health Advisories
Cancer
Group
Status
Reg.*
MCLG
(mg/l)
MCL
(mg/l)
10-kg Child
70-kg Adult
One-day
(mg/l)
Ten-day
(mg/H
Longer-
term
(mg/l)
Longer-
term
(mg/l)
RfO
(mg/kg/
day)
DWEL
(mg/l)
Lifetime
(mg/i)
	1	
mg/l at 10"4
Cancer Risk
Bromochloroacetonitrile
L
-
-
D
-
-
-
-
-
-
-
-
-
Bromochloromethane
-
-
-
F
50
1
1
5
0.013
0.5
0.09
-
'
Brorr.odichloromethane (THM)
L
-
0.1
D
7
7
4
13
0.02
0.7
-
0.06
B2
Bromoform (THM)
L
-
0.1
D
5
2
2
6
0.02
0.7
-
0.4
B2
Broroomethane
L
-
-
F
0.1
0.1
0.1
0.5
0.001
0.05
0.01
-
D
Butyl benzyl phthalate (PAE)
P
zero
0.1
-
-
-
-
-
0.2
6
-
-
C
Butyiate
-
-
-
F
2
2
1
4
0.05
2
0.35
-
D
Butyibenzene n-

-
-
D
-
*
- '
-
-
-
-
-
*
Butyibenzene sec-
-
-
-
D
-
-
-
-
-
-
-
-
-
Butylbenzene tert-
-
-
. -
D
-
-
-
-
-
-
-
-
-
Carbaryl
-
-
-
F
1
1
1
1
0.1
4
0.7
-
D
Carbofuran
F
0,04
0.04
F
0.05
0.05
0.05
0,2
0.005
0.2
0.04
-
E
Carbon tetrachloride
F
zero
0.005
F
4
0.2
0.07
0.3
0.0007
0.03
-
0.03
B2
Carboxin
-
-
-
F
1
1
1
4
0.1
4
0.7
-
D
Chloral hydrate
L
-
-
D
7
1.4
0.2
0.6
0.0002
0.07
0.06
-
C
Chloramben
-
-
-
F
3
3
>0.2
0.5
0.015
0.5
0.1
-
D
iChlordane
F
zero
0.002
F
0.06
0.06
-
-
0.00006
0.002
-
0.003
B2
Chlorodibromomethane (THM)
L
-
0.1
D
7
7
2
8
0.02
0.7
0.06
-
C
Chloroethane
L
-
-
0
-
-
-
-
-
-
-
-
-
Chloroform (THM)
L
-
0.1
D
4
4
0.1
0.4
0.01
0.4
-
0.6
B2
Chloromethane
L
-
-
F
9
0.4
0.4 -
1-
0.004
0.1
0.003
-
C
Chlorophenol (2-)
'
•
-
D
0.05
0.05
0.05
0.2
0.005
0.2
0.04
-
D
p Chlorophenyl methyl













sulfide/sulfone/sulfoxide
-
-
-
• •
-
-
-
-
-
-
-
-
D
Chlc-ropicrin
L
-
-
-
-
-
-
-
-
-
-
-
-
Chlcrothalonil
-
-
-
F
0.2
0.2
0.2
0.5
0.015
0.5
-
0.15
B2
Chlorotoluene o-
L
-
-
F
2
2
2
7
0.02
0.7
0.1
-
D
Chlorotoluene p-
L
-
-
F
2
2
2
7
0.02
0.7
0.1
-
0
: Chlorpyrifos
-
-
-
D
0.03
0.03
0.03
0.1
0.003
0.1
0.02
-
D
| Chrysene (PAH)
P
zero
0.0002
-
-
-
-
-
-
-
-
-
B2
I Cyanazine
L
-
-
F
0.1
0.1
0.02
0.07
0.002
0.07
0.001
-
C
•• A HA will not be developed due to insufficient data; a "Database Deficiency Report has been published.
NOTE: Chrysene was proposed in second option.

-------
Drinking Water Standards and Health Advisories
December 1992
Page
3
Chemicals
Standards
Status
HA*
Health Advisories
Cancer
Group
Status
Reg.#
MCLG
(mg/l)
MCL
(mg/l)
10-kg Child
70-kg Adult
One-day
(mg/l)
Ten-day
(mg/l)
Longer-
term
(mg/|)
Longer*
term
(mg/l)
RfD
(mg/kg/
day)
DWEL
(mg/l)
Lifetime
(mg/l)
mg/l Bt lO"4
Cancer Risk
Cyanogen chloride
L
-
-
-
-
-
-
-
-
-
-
-
-
Cymene p-
- ¦
-
-
D
-
- -

-
-
-

- -
-
2,4-D
F
0.07
0.07
F
1
0.3
0J
0.4
0.01
0.4
0.07
-
D
DCPA (Dacthal)
L
-
-
F
80
80
5
20
0.5
20
4
-
D
Dalapon
F
0.2
0.2
F
3
3
0.3
0.9
0.026
0.9
0.2
-
D
D<[2-ethylhexyl]adipate
F
0.4
0.4
¦ -
20
20
20
SO
0.6
20
0.4
3
C
Drazinon
-
-
-
F
0.02
0.02
0.005
0.02
0.00009
0.003
0.0006
-
E
Diben7(a,h)anthracene (PAH)
P
zero
0.0003
-
>
-
-
-
-
-
-
-
82
Dbromoacetonitrile
L
-
-
D
2
2
2
8
0.02
0.8
0.02
-
C
Dibromochloropropane (DBCP)
F
zero
0.0002
F
0.2
0.05

-
-
-
-
0.003
B2
Dibromomethane
L
-
-
-
-
-
-
-
-
-
-
-
D
Dibutyl phthalate (PAE)

-
-
-
-
t
-
-
0.1
4

-¦
D
Dicamba
L
-
-
F
0.3
0.3
0.3
1
0.03
1
0.2
-
D
DichloroacetSldehyde
L
-
-
D
-
-
-
-
-
-
-
-

Dichloroacetic acid
L
-
-
D
-
50
5
20
o.ooa
0.3
-
-
B2
Oichloroacetonitrite

-
- -
D
1
1
08
3
0.008
0.3
0.006
-
c
Dichlorobenzene o-
F
0.6
0.6
F
9
9
9
30
0.09
3
0.6
-
D
Dichlorobenzene m- •
F
0.6
0.6
F
9
9
9
30
0.09
3
0.6
*
D
Dichlorobenzene p-
F
0.075
0.075
F
10
10
10
40
0.1
4
0.075
-
C
Dichlorodifluoromethane
L
•
-
F
40
40
9
30
0.2
5
1
-
D
Dichloroethane (1,1-)
L
-
-
D
-
-
-
-
-
-
-
-
-
Dichloroethane (1,2-)
F
zero
0,005
F
0.7
0.7
0.7
2.6
-
-
-
0.04
82
Dichloroethylene (1,1-)
F
0.007
0.007
F
2
1
1
4
0.009
0.4
0.007
-
C
j Dichloroethylene (cis-1,2-)

0.07
0.07
F
4
3
3
11
0.01
0.4
0.07

D
Dichloroethylene (trans-1,2-)
F
0.1
0.1
F
20
2
2
6
0.02
0.6
0.1
-
D
| Dichloromethane
F
zero
0.005
F
10
2
-
-
0.06
2
-
0.5
82
| Dichlorophenol (2,4-)
-
-
-
D
0.03
0.03
0.03
0.1
0.003
0.1
0.02
-
D
j Dlcliloropropane (1,1-)
-
•
-
D
-
-
-
-
-

-
'
-
| Dicliloropropane (1,2-)
F
zero
0.005
F
-
0.09
-
-
-
-
-
0.05
B2
I Dichloropropane (1,3-)
i l
-
-
D
-
-
-
-
-
-
-
-

• The values for m-dichlorobenzerie are based on data for o-dichlorobenzene.

-------
Drinking Water Standards and Health Advisories
December 1992	Page 4

Standards
Status
HA*
Health Advisories
Cancer
Group
Chemicals
Status
Reg.*
MCLG
(mg/l)
MCL
(mg/l)
10-tcg Child
70-kg Adult
One-day
(mg/l)
Ten-day
(mg/l)
Longer-
term
(mg/l)
Longer-
term
(mg/l)
RfD
(mg/kg/
day)
DWEL
(mg/l)
Lifetime
(mg/l)
mg/l at 10"4
Cancer Risk
Dichloropropane (2,2-)
L
-
-
D
-
-
-
r,-m
-
-
-
-
-
Dichloropropene (1,1-)
L
-

D
-
-
-
-
-
-
-
-
Dichloropropene (1,3-)
L
-
-
F
0.03
0.03
0.03
0.1
0.0003
0.01
-
0.02
B2
Dieldrin
-
-
-
F
0.0005
0.0005
0.0005
0.002
0.00005
0.002
-
0.0002
B2
Diethyl phthalate (PAE)
-
-
-
D
-
-
-
-
0.8
30
5
-
D
Diethylene glycol dinitrate
-
-
-
• •
-
-
-
-
-
-
-
-
-
Diethylhexyl phthalate (PAE)
F
zero
0.006
D
-
-
-
-
0.02
0.7
-
0.3
B2*
Diisopropyl methylphosphonate
-
-
•
F
8
8
8
30
0.08
3
0.6
-
D
Dimethrin
-
-
-
F
10
10
10
40
0.3
10
2

D
Dimethyl methylphosphonate
-
-
-
F
2
2
2
6
0.2
7
0.1
0.7
C
Dimethyl phthalate (PAE)
-
-
-
-
-
-
-
-
-
-
-
-
D
1,3-Dinitrobenzene
-
-
-
F
0.04
0.04
0.04
0,14
0.0001
0,005
0.001
-
D
Dinitrotoluene (2,4-)
L
-
-
F
0.50
0.50
0.30
1
0.002
0.1
-
0.005
B2
Dinitrotoluene (2,6-)
L
-
-
F
0.40
0.40
0.40
1
0.001
0.04
->
o.oos
82
Dinoseb
F
0.007
0.007
F
0.3
0.3
0.01
0.04
0.001
0.04
0.007
-
D
Dioxane p-
-
-
-
F
4
0.4
-
-
-
-
-
0.7
B2 '
Diphenamid
-
-
-
F
0.3
0.3
0.3
1
0.03
1
0.2
-
D
Dlphenylamlne
-
-
-
F
1
r
0.3
1
0.03
1
0.2

D
Diquat
F
0.02
0.02

-
-
-
-
0.0022
0.08
0.02
-
D
Disulfoton
-
-
-
F
0.01
0,01
0.003
0.009
0.00004
0.001
0.0003
•
E
Dithiane (1,4-)
' -
-
-
F
0.4
0.4
0.4
1
0.01
0.4
0.08
-
D
Diuron

•
-
F
1
1
0.3
0.9
0,002
0.07
0.01
»
0
Endothall
F
0.1
0.1
F
0.8
0.8
0.2
0.2
0.02
0.7
0.1
-
D
Endrin
F
0.002
0.002
F
0,02
0,02
0.003
0,01
0,0003
0.01
0.002
*
O
Epichlorohydrin
F
zero
TT
F
0.1
0.1
0.07
0.07
0.002
0.07
-
0.4
B2
Ethylbenzene
F
0.7
0,7
F
30
3
1
3
0,1
3
0.7
-
0
Ethylene dibromide (EDB)
F
zero
0.00005
F
0.008
0.008
-
-
-
-
-
0.00004
B2
Ethylene glycol
-
-
-
F
20
6
6
20
2
40
7
-
D
ETU
L
-
-
F
0.3
0.3
0.1
0.4
0.00008
0.003
-
0.03
B2
Fenamiphos
-
-
-
F
0.009
0.009
0.005
0.02
0.00025
0.009
0.002
-
D
Fluomeiufon
-
-
-
F
2
2
2
5
0.013
0.4
0.09
-
D
* Under review. •• A HA will not be developed due to insufficient data; a "Database Deficiency Report" has been published.

-------
Drinking Water Standards and Health Advisories
December 1992	Page 5
Chemicals
Standards
Status
HA*
Health Advisories
Cancer
Group.
Status
Reg.*
MCLG
(mg/l)
MCL
(mg/l)
10*g Child
70-kg Adult
One-day
(mg/l)
Ten-day
(mg/l)
Longer-
term
(mg/|)
Longer-
term
(mg/l)
RfO
(mg/kg/
day)
DWEL
(mg/l)
lifetime
(mg/l)
mg/l at 10*
Cancer Risk
Fluorene (PAH)
-

-
-
-
-
-
-
0.04
-
-
-
D
Fluorotrichl'oromethane
L


F
7
7
3
10
0.3
10
2

D
Fog Oil
-

-
D
-
-
-
-
-
-
-
-
-
Fonofos
-

-
F
0.02
0.02
0.02.
0.07
0.002
0.07
0.01

D
Formaldehyde
-

-
D
10
5
5
20
0.15
5
1
-
B1
Gasoline, unleaded (benzene)
-

¦-
D
-
-
-
-
-
-
0.005
-
-
Glyphosate
F
0.7
0.7
F
20
20
1
1
0.1
4
0.7
-
D
Heptachlor
F
zero
0.0004
F
0.01
0.01
0.005
0.005
0.0005
0.02
-
0.0008
B2
Heptachlor epoxide
F
zero
0.0002
F
0.01
-
0.0001
0.0001
1.3E-0.5
0.0004
-
0.0004
B2
Hexachlorobenzene
F
zero
0.001
F
0.05
0.05
0.05
0,2
0.0008
0.03
-
0.002
B2
Hexachlorobutadiene
L
-
-
F
0.3
0.3
0.1
0.4
0.002
0.07
0.001
-
C
Hexachlorocyclopentadiene
F
0.05
0.05
¦-
-

-
-
0.007
0.2
*
-
D
Hexachloroethane
L
-
-
F
5
5
0.1
0.5
0.001
0.04
0.001
-
C
Hexane (n-)

-

F
10
4
4
10
-
-
" ~
-
0
Hexazinone
-
-
-
F
3
3
3
9
0.033
1
0.2
-
D
HMX
-
-
-
F
6
6
5
20
0.05
2
0.4
-
D
Hypochlorite
L
-
-
-
-
-
-
-
-

-
-
-
Hypochlorous acid
-
-

-
-
-
-
*
-
*
-
-
.-
lndeno(1,2,3,-c,d)pyrene (PAH)
P
zero
0.0004
D
-
-
-
-
-
-
-
-
B2
Isophorone
L
•
' -
F
15
15
15
15
0.2
7
0.1
4
C
Isopropyl methylphosphonate
-
-
-
D
30
30
30
100
0.1
4.0
0.7
-
D
Isopropylbenzene
-
*
-
D
»
-
¦*
-
-
*
-

M
Lindane
F
0.0002
0.0002
F
1
1
0.03
0.1
0.0003
0.01
0.0002
-
c
Malathion
-
~

D
0.2
0.2
0.2
0.8
0.02
0.8
0.2
• .
0
Maleic hydrazide
-
-
-
F
10
10
5
20
0.5
20
4
-
D
MCPA
-
-
-
F
0.1
0.1
0,1
0.4
0.0015
0.05
0.01
-
•£
Methomyl
L
-
-
F
0.3
0.3
0.3
0.3
0.025
0.9
0.2
-
D
Methoxychlor
F
0.04
0.04
F
0.05
0.05
0,05
0.2
0.005
0.2
0.04
' "
0
Methyl ethyl ketone
-
-
-
-
-
-
-
-
-
-
-
-
«
Metnyl parathion
-
-
-
F
0.3
0.3
0.03
0.1
0.00025
0.009
0.002
-
D
* Under review.

-------
December 1992
Drinking Water Standards and Health Advisories
Page 6
Chemicals
Standards
Status
HA*
Health Advisories
Cancer
Group
Status
Reg.*
MCLG
(mg/1)
MCL
(mg/l)
10-kfl Child
70-kg Adult
One-day
(mg/l)
Ten-day
(mg/l)
longer-
term
(mg/l)
longer*
term
(mg/l)
RfD
(mg/kg/
day)
DWEL
(mg/l)
Lifetime
(mg/l)
mg/l at 10*
Cancer Risk
Methyl tert butyl ether
L
-
-
D
3
3
0.5
2
0.005
0.2
0.04
-
D
Metolachlor
L
-

F
2
2
2
5
0.15
5
0.1

C
Metribuzin
L
-
-
F
5
5
0.3
0.9
0.025
0.9
0.2
-
D
Monochloroacetic acid
L
-
-
D
-
¦ *

- '
•-
-
-
-
-
Monochlorobenzene
F
0.1
0.1
F
2
2
2
7
0.02
0.7
0.1
-
D
Naphthalene
-
-
-
F
0.5
0.5
0.4
1
0.004
0.1
0.02
-
D
Nitrocellulose (non-toxic)
-
-
-
F
-
-
-
-
-
-
-
-
-
Nitroguanidine
-
-
~
F
10
10
10
40
0.1
4
0.7
-
D
Nitrophenols p-
-
-
-
D
0.8
0.8
0.8
3
0.008
0.3
0.06
-
D
Oxamyl (Vydate)
F
0.2
0.2
F
0.2
0.2
0.2
0,9
0.025
0,9
0.2
-
E
Ozone by-products
L
-
-
-
-
-
-
-
-
-
-
-
-
Paraquat
-
-
-
F
0,1
0.1
0.05 .
0.2
0.0045
0.2
0.03
-

Pentachloroethane
-
-
-
O
-
-
-
-
-
-
-
-
-
PentachloropHenol
F
zero
0.001
F
1
0.3
0.3
1
0.03
1
-
0.03
B2
Phenanthrene (PAH)
-
-
-
-
-
-
-
-
-
-
-
-
-
Phenol
-
-
-
D
6
6
6
20
0.6
20
4
-
D
Picloram
F
0.5
0.5
F
20
20
0.7
2
0.07
2
0.5
-
0
Polychlorinated biphenyls (PCBs)
F
zero
0.0005
P

. -
~
-
-
-
-
0.0005
B2
Prometon
L
-
-
F
0.2
0.2
0.2
0.5
0.015*
0.5*
0.1*
-
D
Pronamide
-
•
-
F
0.8
0.8
0.8
3
0.075
3
0,05
*
C
Propachlor
-
-
-
F
0.5
0.5
0.1
0.5
0.013
0.5
0.09
-
D
Propazine
-
-
-
F
1
1
0.5
2
0.02
0.7
0,01
*
C
Propham
-
-
-
F
5
5
5
20
0.02
0.6
0.1
-
D
Propylbenzene n-
*
*

P
-
-
<¦
*'
- ¦
-
-
*
*
Pyrene (PAH)
-
-
-
-
-
-
-
-
0.03
-
-
-
D
RDX
-
-
- ^
F
0,1
0,1
0,1.
0.4
0.003
0.1
0.002
0,03
C
Simazine
F
0.004
0.004
F
0.07
0.07
0.07
0.07
0.005
0.2
0.004
-
c
Styrene
F
0.1
0,1
F
20
2
2
7
0.2
7
0.1
-
c
2,4,5-T
L
-
-
F
0.8
0.8
0.8
1
0.01
0.35
0.07
-
D
2.3,7,8-TCDD (Dioxin)
F
2ero
3E-08
F
1E-06
1E-07
1E-08
4E-08
1E-09
4E-08
-
2E-08
B2
* Under leview. NOTE: Phenanthrene — not proposed.

-------
Drinking Water Standards and Health Advisories
December 1992	Page 7
Chemicals
Standards
Status
HA*
Health Advisories
Cancer
Group
Status
Reg.*
MCIG
(mg/l)
MCL
(mg/l)
lO-kg Child
70-kg Adult
One-day
(mg/l)
Ten-day
(mg/l)
Longer-
term
(mg/l)
Longer-
term
(mg/l)
RfD
(mg/kg/
day)
DWEL
(mg/l)
Lifetime
(mg/l)
mg/l at 10"*
Cancer Risk
Tebuthiuron
-
-
-
F
3
3
0.7
2
0.07
2
0.5

D
Terbacil
* '
-
-
F
0,3
0.3
0.3
0,9
0.013
0,4
0.09

ft
Terbufos
-
-
-
F
0.005
0.005
0.001
0.005
0.00013
0.005
0.0009

D
Tetrachloroethane (1,1,1,2-)

-
-
F
2
2
0.9
3
0.03
1
0.07

C
Tetrachloroethane (1,1,2,2-)
L
-

D
-
-
-
-
-
-
-

-
T etrachloroethy lene
F
zero
0.005
F
2
2
1
5
0.01
o.s
-
0.07
-
Tetranitromethane

-
-
»•
-
-
-
-
-
-
-

-
Toluene
F
1
1
F
20
2
2
7
0.2
7
1

D
Toxaphene
F
zero
0.003
F
0.5
0.04
-
-
0.1
0.0035
-
0.003
B2
2,4,5-TP
F
0,05
0.05
F
0.2
0.2
0.07
0.3
0.0075
0.3
0.05

D
1,1,2-Trichloro-1,2,2-













trifluoroethane

-
-
-
-
-
-
-
-
-
-

-
Trichloroacetic acid
L
-
-
D
-
2
4
13
0.04
1.3
1

C
T richloroactorfitrile
L
-
-
D
0.05
0.05
-
-
-
-
-

-
Trichlorobenzene (1,2,4-)

0.07
0.07
F
0.1
0.1
0.1
0.5
0.01
0.4
0.07

0
Trichlorobenzene (1,3,5-)

-
-
F
0.6
0.6
0.6
2
0.006
0.2
0.04

0
Trichioroethane (1,1,1-)

0.2
0.2
F
100
40
40
100
0.035
1
0.2

D
Trichioroethane (1,1,2-)

0.003
0.005
F
0.6
0.4
0.4
1
0.004
0.1
0.003

C
Trichloroethanol (2,2,2-)
I
-
-
¦ -
-

-
-
-
-
-

-
Trichloroethylene
F
zero
0.005
F
-
-
-
-
-
0.3
-
0.3
B2
Trichlorophenol (2,4,6-)
L
-
-
D
-
-
r
*
-
-
-
0.3
82
Trichlorop'ropane (1,1,1-)

-
-
D
-
-
-
-
-
-
-
-
-
Trichloropropane (1,2,3-)
L ,
-
-
F
0.6
0.6
0.6
2
0.006
0.2
0.04

B2
Trifluralin
L
-
-
F
0.08
0.08
0.08
0.3
0.0075
0.3
0.005
-
C
TrimethyIbenzene (1,2,4-)
-
-
-
D
-
-
-
-
-
-
-
-
- .
Trimethylbenzene (1,3,5-)
-
-
-
D
-
-
-
-
-
-
-
-
-
Trinitroalycerol
-
-
-
F
. 0.005
0.005
0.005
0.005
-
-
0.005
-
~
Trinitrotoluene
-
-
-
F
0.02
0.02
0.02
0.02
0.0005
0.02
0.002
0.1
C
Vinyl chloride
F
zero
0.002
F
3
3
0.01
0.05
-
-
-
0.0015
A
Whiti; phosphorus
-
-
-
F
-
-
-
-
0.00002
0.0005
0.0001
-
D
Xylenes .
F
10
10
F
40
40
40
100
2
60
10
*
D
"A HA will not be developed due to insufficient data; a "Database Deficiency Report" has been published.

-------
December 1992
Drinking Water Standards and Health Advisories
Page 8

Standards

Health Advisories
Cancer
Group
Chemicals
Status
Rag.*
MCLG
(mg/1)
MCL
(mg/1)
Status
HA*
10-kg Child
70-kg Adult
One-day
(mg/1)
Ten-day
(mg/1)
Longer-
term
(mg/1)
Longer*
term
(mg/1)
RfO
(mg/kg/
day)
DWEL
(mg/1)
Lifetime
(mg/1)
mg/1 et 10"4
Cancer Risk
INORGANICS












Aluminum
L
-
D
-
-
-
-
-
-
-
-
-
Ammonia
-
~ T—
D
-
-
- -'
| ¦»-
-
-
30
-
D
Antimony
F 0.006
0.006
F
0.015
0.015
0.015
0.015
0.0004
0.015
0.003
-
D
Arsenic
•
0.05
D
-
*
*
-
-
-
-
0,002
A
Asbestos (fibers/1 > 10prr.
F 7 MFL
7 MFL
-
-
-
-
-
-
-
-
700 MFL
A
length)












Barium
F 2
2
F
-
-
-
-
0.07
2
2
-
D
Beryllium
F 0.004
0.004
D
30
30
4
20
0.005
0.2
-
0.0008
B2
¦ Boron
L
-
D
4
0.9
0.9
3
0.09
3
0,6
-
•
[Cadmium
F 0.005
0.005
F
0.04
0.04
0.005
0.02
0.0005
0.02
0.005
-
D
jChloramine
L
-
D
1
1
1
1
0.1
3.3
2.6
*
-
Chlorate
L
-
D
-
-
-
-
-
-
-
-
-
Chlorine
L
-
0
-
-
-
-
-
-
-
-

Chlorine dioxide
L
-
D
-
-
-
-
-
-
-
-
-
Chlorite
L
-
D
-
-
-
-
-
-
-
-
-
Chromium (total)
F 0.1
0.1
F
1
1
0.2
0.8
0.005
0.2
0.1
-
D
Copper
F 1.3
TT* *
-
-

-
-
-
•
-
-
D
Cyanide
P 0.2
0.2
F
0.2
0.2
0.2
0.8
0.022
0.8
0.2
-
D
Fluoride*
F 4
4
*
¦ -
-
-
•
0.12
•
-
-
»
Lead (at tap)
F zero
TT* '
-
-
-
-
-
-
-
-
-
B2
Manganese
L 0.2

D

«*
*
-
0.14/
~
-
'
n-








0.005




Mercury (inorganic)
F 0.002
0.002
F
-
-

0.002
0.0003
0.01
0.002
-
D
Molybdenum
L
-
F
-
0.08
0.01
o.os
0.005
0.2
0.04
-
D
| Nickel
F 0.1
0.1
F
1
1
0.5
1.7
0.02
0.6
0.1
-
D
! Nitrate (as N)
F 10
10
F
1
0*
-
-
1.6
-
-
-
•
! Nitr-te (as N)
\	—	:	ir-1
F 1
1
F
-
1*
-
-
0.16*
-
-
-
•
* Under review.
*' Copper — action level 1.3 mg'L
Lead — action level 0.015 rrg/L

-------
December 1992
Drinking Water Standards and Health Advisories
Page 9
J Chemicals
Standards
*
Status
WA*
Health Advisories
Canoer
Urbup'

1NCLG
ImgJI)
MCL
(mofl)
*04«€Md
70-fcg Adult:

On»day
(rnflfl)
Ttinlay
Jroofl)
longer-:
¦ **&¦¦¦
JLonger*
taim :
{ntgJIJ
RfD
(mg/kg/

-------
Secondary Maximum Contaminant Levels
December 1992	Page 10
Chemicals
Status
SMCLs (mg/L)
Aluminum
F
0.05 to 0.2
Chloride

250
Color
F
15 color units
Copper

1
Corrosivity
F
non-corrosive
Fluoride*
F
2
Foaming agents
F
0.5
Hexachlorocyclopentadiene

0.008
Iron
F
0.3
Manganese
F
0.05
Odor
F
3 threshold odor numbers
PH
F
6.5 - 8.5
Silver
F
0.10
Sulfate
F
250
Total dissolved solids (TDS)
F
500
Zinc
F
5
Status Codes: P — proposed, F — final
* Under review.

-------
Microbiology
December 1992	Page 11

Status
MCLG
MCL
Cryptosporidium
L
-
-
Giardia lamblia
F
zero
TT
Legionella
F>
zero
TT
Standard Plate Count
P
NA
TT
Total Coliforms (after 12/31/90)
F
zero
* *
Turbidity (after 12/31/90)
F
NA
PS
Viruses
F>
zero
TT
Key: PS, TT, F, defined as previously stated.
Final for systems using surface water; also being considered for
regulation under groundwater disinfection rule.

-------