%	United States
pMll Environmental Protection
Agency
2018 Edition of the Drinking
Water Standards and Health
Advisories Tables
The 2012 Drinking Water Standards and Health Advisories
(DWSHA) Tables were amended March 2018 to fix typographical
errors and add health advisories published after 2012.

-------
2018 Edition of the Drinking Water
Standards and Health Advisories
EPA 822-F-18-001
Office of Water
U.S. Environmental Protection Agency
Washington, DC
March 2018
Recycled/Recyclable Printed
on paper that contains at
least 50% recycled fiber.

-------
Drinking Water Standards and Health Advisories
March 2018	Page iii of viii
The Health Advisory (HA) Program, sponsored by the EPA's Office of Water (OW), publishes
concentrations of drinking water contaminants at Drinking Water Specific Risk Level Concentration for
cancer (10"4 Cancer Risk) and concentrations of drinking water contaminants at which noncancer
adverse health effects are not anticipated to occur over specific exposure durations - One-day, Ten-day,
and Lifetime - in the Drinking Water Standards and Health Advisories (DWSHA) tables. The One-day
and Ten-day HAs are for a 10 kg child and the Lifetime HA is for a 70 kg adult. The daily drinking
water consumption for the 10 kg child and 70 kg adult are assumed to be 1 L/day and 2 L/day,
respectively. The Lifetime HA for the drinking water contaminant is calculated from its associated
Drinking Water Equivalent Level (DWEL), obtained from its RfD, and incorporates a drinking water
Relative Source Contribution (RSC) factor of contaminant-specific data or a default of 20% of total
exposure from all sources. Maximum Contaminant Levels (MCLs) and Maximum Contaminant Level
Goals (MCLGs) for some regulated drinking water contaminants are also published.
HAs serve as the informal technical guidance for unregulated drinking water contaminants to assist
Federal, State and local officials, and managers of public or community water systems in protecting
public health as needed. They are not to be construed as legally enforceable Federal standards. EPA's
OW has provided MCLs, MCLGs, RfDs, One-Day HAs, Ten-day HAs, DWELs, Lifetime HAs,
Drinking Water Specific Risk Level Concentration for cancer (10"4 Cancer Risk), and Cancer
Descriptors in the DWSHA tables. HAs are intended to protect against noncancer effects. The 10"4
Cancer Risk level provides information concerning cancer effects. The MCL values for specific drinking
water contaminants must be used for regulated contaminants in public drinking water systems.
The DWSHA tables are revised periodically by the OW so that the benchmark values are consistent with
the most current Agency assessments. Reference dose (RfD) values are updated to reflect the values in
the Integrated Risk Information System (IRIS) and the Office of Pesticide Programs (OPP)
Reregi strati on Eligibility Decisions (REDs) documents. The associated DWEL is recalculated
accordingly. The 2018 DWSHA tables do not reflect assessments from IRIS or OPP published from
2012 to 2018. The DWSHA tables are currently undergoing a modernization effort to move the relevant
HA information into a web-based format. This posting of the 2018 DWSHA tables is an intermediate
step to address typographical errors and include health advisories published since the 2012 tables were
published.
A Lifetime noncancer benchmark is made available to risk assessment managers for comparison to the
cancer risk level drinking water concentration (10"4 Cancer Risk) and to determine whether the
noncancer Lifetime HA or the cancer risk level drinking water concentration provides a more
meaningful scenario-specific risk reduction. In this regard, the Office of Water defines the Lifetime HA
as the concentration in drinking water that is not expected to cause any adverse noncarcinogenic effects
for a lifetime of exposure, whereas the 10"4 Cancer Risk is the concentration of the chemical contaminant
in drinking water that is associated with a specific probability of cancer. The Office of Water also
advises consideration of the more conservative cancer risk levels (10"5, 10"6), found in the IRIS or OPP
RED source documents, if it is considered more appropriate for exposure-specific risk assessment.

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Drinking Water Standards and Health Advisories
March 2018	Page iv of viii
Many of the values on the DWSHA tables have been revised since the original HAs were
published. Revised RfDs, 10"4 Cancer Risk values, and cancer designations or descriptors
obtained from Integrated Risk Information System (IRIS) are presented in BOLD type. Revised
RfDs, 10"4 Cancer Risk values, and cancer designations or descriptors obtained from Office of
Pesticide Program's Registration Eligibility Decision (OPP RED) are presented in BOLD
ITALICS type
The summaries of IRIS Toxicological Reviews from which the RfDs and cancer benchmarks, as
well as the associated narratives and references can be accessed at: http://www.epa. gov/IRIS.
Those from OPP REDs can be accessed at:
http://www.epa.gov/pesticides/reregistration/status.htm.
In some cases, there is an HA value for a contaminant but there is no reference to an HA
document. Such HA values can be found in the Drinking Water Criteria Document for the
contaminant.
With a few exceptions, the RfDs, Health Advisories, and Cancer Risk values have been rounded
to one significant figure following the convention adopted by IRIS.
For unregulated chemicals with current IRIS or OPP REDs RfDs, the Lifetime Health Advisories
are calculated from the associated DWELs, using the RSC values published in the HA
documents for the contaminants.
The DWSHA tables may be reached from the Water Science home page at:
http://www.epa.gov/waterscience/. The DWSHA tables are accessed under the Drinking Water icon.
Copies of the Tables may be ordered free of charge from
SAFE DRINKING WATER HOTLINE
1-800-426-4791
Monday thru Friday, 9:00 AM to 5:30 PM EST

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Drinking Water Standards and Health Advisories
March 2018	Page v of viii
DEFINITIONS
The following definitions for terms used in the DWSHA tables are not all-encompassing, and should not
be construed to be "official" definitions. They are intended to assist the user in understanding terms used
in the DWSHA tables.
Action Level: The concentration of a contaminant which, if exceeded, triggers treatment or other
requirements which a water system must follow. For example, it is the level of lead or copper which, if
exceeded in over 10% of the homes tested, triggers treatment for corrosion control.
Cancer Classification: A descriptive weight-of-evidence judgment as to the likelihood that an agent is a
human carcinogen and the conditions under which the carcinogenic effects may be expressed. Under the
2005 EPA Guidelines for Carcinogen Risk Assessment, Cancer Descriptors replace the earlier alpha
numeric Cancer Group designations (US EPA 1986 guidelines). The Cancer Descriptors in the 2005
EPA Guidelines for Carcinogen Risk Assessment are as follows:
	"carcinogenic to humans" (H)
	"likely to be carcinogenic to humans" (L)
	"likely to be carcinogenic above a specified dose but not likely to be carcinogenic below that
dose because a key event in tumor formation does not occur below that dose" (L/N)
	"suggestive evidence of carcinogenic potential" (S)
	"inadequate information to assess carcinogenic potential" (I)
	"not likely to be carcinogenic to humans" (N)
The letter abbreviations provided parenthetically above are now used in the DWSHA tables in place of
the prior alpha numeric identifiers for chemicals that have been evaluated under the new guidelines (the
2005 guidelines or the 1996 and 1999 draft guidelines) or whose records in the DWSHA tables have
been revised.
Cancer Group: A qualitative weight-of-evidence judgment as to the likelihood that a chemical may be
a carcinogen for humans. Each chemical was placed into one of the following five categories (US EPA
1986 guidelines). The Cancer Group designations are given in the Tables for chemicals that have not yet
been evaluated under the new guidelines or whose records in the DWSHA tables have been revised.
Group Category
A Human carcinogen
B Probable human carcinogen:
B1 indicates limited human evidence
B2 indicates sufficient evidence in animals and inadequate or no evidence in humans
C Possible human carcinogen
D Not classifiable as to human carcinogenicity
E Evidence of noncarcinogenicity for humans

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Drinking Water Standards and Health Advisories
March 2018	Page vi of viii
10"4 Cancer Risk: The concentration of a chemical in drinking water corresponding to an excess
estimated lifetime cancer risk of 1 in 10,000.
Drinking Water Advisory: A nonregulatory concentration of a contaminant in water that is likely to be
without adverse effects on health and aesthetics for the period it is derived.
DWEL: Drinking Water Equivalent Level. A DWEL is a drinking water lifetime exposure level,
assuming 100% exposure from that medium, at which adverse, noncarcinogenic health effects would
not be expected to occur.
HA: Health Advisory. An estimate of acceptable drinking water levels for a chemical substance based
on health effects information; an HA is not a legally enforceable Federal standard, but serves as
technical guidance to assist Federal, State, and local officials.
One-Day HA: The concentration of a chemical in drinking water that is not expected to cause
any adverse noncarcinogenic effects for up to one day of exposure. The One-Day HA is intended
to protect a 10-kg child consuming 1 liter of water per day.
Ten-Day HA: The concentration of a chemical in drinking water that is not expected to cause
any adverse noncarcinogenic effects for up to ten days of exposure. The Ten-Day HA is also
intended to protect a 10-kg child consuming 1 liter of water per day.
Lifetime HA: The concentration of a chemical in drinking water that is not expected to cause
any adverse noncarcinogenic effects for a lifetime of exposure, incorporating a drinking water
RSC factor of contaminant-specific data or a default of 20% of total exposure from all sources.
The Lifetime HA is based on exposure of a 70-kg adult consuming 2 liters of water per day. For
Lifetime HAs developed for drinking water contaminants before the Lifetime HA policy change
to develop Lifetime HAs for all drinking water contaminants regardless of carcinogenicity status
in this DWSHA update, the Lifetime HA for Group C carcinogens, as indicated by the 1986
Cancer Guidelines, includes an uncertainty adjustment factor of 10 for possible carcinogenicity.
MCLG: Maximum Contaminant Level Goal. A non-enforceable health benchmark goal which is set at a
level at which no known or anticipated adverse effect on the health of persons is expected to occur and
which allows an adequate margin of safety.
MCL: Maximum Contaminant Level. The highest level of a contaminant that is allowed in drinking
water. MCLs are set as close to the MCLG as feasible using the best available analytical and treatment
technologies and taking cost into consideration. MCLs are enforceable standards.
Oral cancer slope factor: The slope factor is the result of application of a low-dose extrapolation
procedure and is presented as the risk per (mg/kg)/day.
RfD: Reference Dose. An estimate (with uncertainty spanning perhaps an order of magnitude) of a daily
oral exposure to the human population (including sensitive subgroups) that is likely to be without an
appreciable risk of deleterious effects during a lifetime.

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Drinking Water Standards and Health Advisories
March 2018	Page vii of viii
Risk Specific Level Concentration: The concentration of the chemical contaminant in drinking water
or air providing cancer risks of 1 in 10,000, 1 in 100,000, or 1 in 1,000,000.
SDWR: Secondary Drinking Water Regulations. Non-enforceable Federal guidelines regarding
cosmetic effects (such as tooth or skin discoloration) or aesthetic effects (such as taste, odor, or color) of
drinking water.
TT: Treatment Technique. A required process intended to reduce the level of a contaminant in drinking
water.
Unit Risk: The unit risk is the quantitative estimate in terms of either risk per |ig/L drinking water or
risk per |ig/m3 air breathed.

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Drinking Water Standards and Health Advisories
March 2018	Page viii of viii
ABBREVIATIONS
D	Draft
DWEL	Drinking Water Equivalent Level
DWSHA	Drinking Water Standards and Health Advisories
F	Final
HA	Health Advisory
I	Interim
IRIS	Integrated Risk Information System
MCL	Maximum Contaminant Level
MCLG	Maximum Contaminant Level Goal
NA	Not Applicable
NOAEL	No-Observed-Adverse-Effect Level
OPP	Office of Pesticide Programs
OW	Office of Water
P	Proposed
Pv	Provisional
RED	Registration Eligibility Decision
Reg	Regulation
RfD	Reference Dose
TT	Treatment Technique

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March 2018
Drinking Water Standards and Health Advisories
Page 1 of 12


Stiindiii'ds

Health Advisories







10-kg Child



CASRN
Status
MCLG
MCL
Status IIA
One-dav
Ten-day
Rfl)
DW1CL
Life-time
mg/L at 10 4
Cancer
Chemicals
Number
Reg.
(mg/L)
(mg/L)
Document
(mg/L)
(mg/L)
(mg/kg/dav)
(mg/L)
(mg/L)
Cancer Risk
Descriptor1
ORGANICS
Acenaphthene
83-32-9
-
-
-
-
-
-
0.06
2
-
-
-
Acifluorfen (sodium)
62476-59-9

-
-
F '88
2
2
0.01
0.4
-
0.1
UN
Acrylamide
79-06-1
1''
zero
TT2
F '87
1.5
0.3
0.002
0.07
-
-
L
Acrylonitrile
107-13-1

-
-
-
-
-
-
-
-
0.006
B1
Alachlor
15972-60-8
1''
zero
0.002
F '88
0.1
0.1
0.01
0.4
-
0.04
B2
Aldicarb3
116-06-3
F4
0.001
0.003
F '95
0.01
0.01
0.001
0.035
0.007
-
D
Aldicarb sulfone3
1646-88-4
F4
0.001
0.002
F '95
0.01
0.01
0.001
0.035
0.007
-
D
Aldicarb sulfoxide3
1646-87-3
F4
0.001
0.004
F '95
0.01
0.01
0.001
0.035
0.007
-
D
Aldrin
309-00-2
-
-
-
F '92
0.0003
0.0003
0.00003
0.001
-
0.0002
B2
Ametryn
834-12-8
-
-
-
F '88
9
9
0.009
0.3
0.06
-
D
Ammonium sulfamate
7773-06-0
-
-
-
F '88
20
20
0.2
8
2
-
D
Anthracene (PAH)5
120-12-7
-
-
-
-
-
-
0.3
10
-
-
D
Atrazine
1912-24-9
F
0.003
0.003
F '88
-
-
0.02
0.7
-
-
N
Baygon
114-26-1
-
-
-
F '88
0.04
0.04
0.004
0.1
0.003
-
C
Bentazon
25057-89-0
-
-
-
F '99
0.3
0.3
0.03
1
0.2
-
E
Benz[a]anthracene (PAH)
56-55-3
-
-
-
-
-
-
-
-
-
-
B2
Benzene
71-43-2
F
zero
0.005
F '87
0.2
0.2
0.004
0.1
0.003
1 to 10
H
Benzo[a]pyrene (PAH)
50-32-8
F
zero
0.0002
-
-
-
-
-
-
0.0005
B2
Benzo[b]fluoranthene (PAH)
205-99-2
-
-
-
-
-
-
-
-
-
-
B2
Benzo[g,h,i]perylene (PAH)
191-24-2
-
-
-
-
-
-
-
-
-
-
D
Benzo[k]fluoranthene (PAH)
207-08-9
-
-
-
-
-
-
-
-
-
-
B2
Bis(2-chloro-1 -methylethyl) ether
108-60-1
-
-
-
F '89
4
4
0.04
1
0.3
-
-
Bromacil
314-40-9
-
-
-
F '88
5
5
0.1
3.5
0.07
-
C
Bromobenzene
108-86-1
-
-
-
D '86
4
4
0.008
0.3
0.06
-
I
1	Chemicals evaluated under the 2005 Cancer Guidelines or the 1996 or 1999 drafts are demoted by an abbreviation for their weight-of-the-evidence descriptor (see page iii). If the agency has
not completed a new assessment for the chemical, the 1986 Guidelines Group designation (see page iii) is given in the Cancer Descriptor column.
2	When Acrylamide is used in drinking water systems, the combination (or product) of dose and monomer level shall not exceed that equivalent to a polyacrylamide polymer containing 0.05%
monomer dosed at 1 mg/L.
3	The MCL value for any combination of two or more of these three chemicals should not exceed 0.007 mg/L because of a similar mode of action.
4	Administrative stay of the effective date.
5	PAH = Polycyclic aromatic hydrocarbon.

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March 2018
Drinking Water Standards and Health Advisories
Page 2 of 12


Standards

Health Advisories







10-kg Child



CASRN
Status
MCLG
MCL
Status 11A
()ne-da_v
Ten-day
RID
DWEL
Life-time
mg/L at 104
Cancer
( 'hemicals
Number
Reg.
(mg/L)
(mg/L)
Document
(mg/L)
(mg/L)
(ing/kg/day)
(mg/L)
(mg/L)
Cancer Risk
Descriptor
Bromochloromethane
74-97-5
-
-
-
F '89
50
1
0.01
0.5
0.09
-
D
Bromodichloromethane (THM)
75-27-4
1''
zero
0.081
-
1
0.6
0.003
0.1
-
0.1
L
Bromoform (THM)
75-25-2
1''
zero
0.081
-
5
0.2
0.03
1
-
0.8
L
Bromomethane
74-83-9
-
-
-
D '89
0.1
0.1
0.001
0.05
0.01
-
D
Butyl benzyl phthalate
85-68-7
-
-
-
-
-
-
0.2
7
-
-
C
Butylate
2008-41-5
-
-
-
F '89
2
2
0.05
2
0.4
-
D
Carbaryl
63-25-2
-
-
-
F '88
1
1
0.01
0.4
-
4
L
Carbofuran
1563-66-2
1''
0.04
0.04
F '87
-
-
0.00006
-
-
-
N
Carbon tetrachloride
56-23-5
1''
zero
0.005
F '87
4
0.2
0.004
0.1
0.03
0.05
L
Carboxin
5234-68-4
-
-
-
F '88
1
1
0.1
3.5
0.7
-
D
Chloramben
133-90-4
-
-
-
F '88
3
3
0.015
0.5
0.1
-
D
Chlordane
12798-03-6
1?
zero
0.002
F '87
0.06
0.06
0.0005
0.02
0.004
0.01
B2
Chloroform (THM)
67-66-3
1''
0.07
0.081
-
4
4
0.01
0.35
0.07
-
L/N
Chloromethane
74-87-3
-
-
-
F '89
9
0.4
-
-
-
-
I
Chlorophenol (2-)
95-57-8
-
-
-
D '94
0.5
0.5
0.005
0.2
0.04
-
D
Chlorothalonil
1897-45-6
-
-
-
F '88
0.2
0.2
0.015
0.5
-
0.15
B2
Chlorotoluene o-
95-49-8
-
-
-
F '89
2
2
0.02
0.7
0.1
-
D
Chlorotoluene p-
106-43-4
-
-
-
F '89
2
2
0.02
0.7
0.1
-
D
Chlorpyrifos
2921-88-2
-
-
-
F '92
0.03
0.03
0.0003
0.01
0.002
-
D
Chrysene (PAH)
218-01-9
-
-
-
-
-
-
-
-
-
-
B2
Cyanazine
21725-46-2
-
-
-
D '96
0.1
0.1
0.002
0.07
0.001
-

1 1998 Final Rule for Disinfectants and Disinfection By-products: The total for trihalomethanes (THM) is 0.08 mg/L.

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March 2018
Drinking Water Standards and Health Advisories
Page 3 of 12
Chemicals
CASRN
Number
Stiindiirds
Stiitus 11A
Document
Health Advisories
(lancer
Descriptor
Status
Reg.
MCLG
(mg/L)
MCL
(mg/L)
10-kg Child

One-dav
(mg/L)
Ten-dav
(mg/L)
RID
(ing/kg/day)
DWEL
(mg/L)
Life-time
(mg/L)
mg/L at 10 4
(lancer Risk
Cyanogen chloride1
506-77-4
-
-
-
-
0.05
0.05
0.05
2
-
-
D
2,4-D (2,4-dichlorophenoxyacetic acid)
94-75-7
F
0.07
0.07
F '87
1
0.3
0.005
0.2
-
-
D
DCPA (Dacthal)
1861-32-1
-
-
-
F '08
2
2
0.01
0.35
0.07
-
C
Dalapon (sodium salt)
75-99-0
F
0.2
0.2
F '89
3
3
0.03
0.9
0.2
-
D
Di(2-ethylhexyl)adipate
103-23-1
F
0.4
0.4
-
20
20
0.6
20
0.4
3
C
Di(2-ethylhexyl)phthalate
117-81-7
F
zero
0.006
-
-
-
0.02
0.7
-
0.3
B2
Diazinon
333-41-5
-
-
-
F '88
0.02
0.02
0.0002
0.007
0.001
-
E
Dibromochloromethane (THM)
124-48-1
F
0.06
0.082
-
0.6
0.6
0.02
0.7
0.06
0.08
S
Dibromochloropropane (DBCP)
96-12-8
F
zero
0.0002
F '87
0.2
0.05
-
-
-
0.003
B2
Dibutyl phthalate
84-74-2
-
-
-
-
-
-
0.1
4
-
-
D
Dicamba
1918-00-9
-
-
-
F '88
-
-
0.5
18
4
-
N
Dichloroacetic acid
76-43-6
F
zero
0.063
-
3
3
0.004
0.1
0.03
0.07
L
Dichlorobenzene o-
95-50-1
F
0.6
0.6
F '87
9
9
0.09
3
0.6
-
D
Dichlorobenzene 4
541-73-1
-
-
-
F '87
9
9
0.09
3
0.6
-
D
Dichlorobenzene p-
106-46-7
F
0.075
0.075
F '87
11
11
0.1
4
0.075
-
C
Dichlorodifluoromethane
75-71-8
-
-
-
F '89
40
40
0.2
5
1
-
D
Dichloroethane (1,2-)
107-06-2
F
zero
0.005
F '87
0.7
0.7
-
-
-
0.04
B2
Dichloroethylene (1,1-)
75-35-4
F
0.007
0.007
F '87
2
1
0.05
2
0.4
0.006
S
Dichloroethylene (cis-1,2-)
156-59-2
F
0.07
0.07
F '90
4
3
0.002
0.07
0.01
-
I
Dichloroethylene (trans-1,2-)
156-60-5
F
0.1
0.1
F '87
20
2
0.02
0.7
0.1
-
I
Dichloromethane
75-09-2
F
zero
0.005
D '93
10
2
0.06
2
0.2
0.5
L
Dichlorophenol (2,4-)
120-83-2
-
-
-
D '94
0.03
0.03
0.003
0.1
0.02
-
E
Dichloropropane (1,2-)
78-87-5
F
zero
0.005
F '87
-
0.09
-
-
-
0.06
B2
Dichloropropene (1,3-)
542-75-6
-
-
-
F '88
0.03
0.03
0.03
1
-
0.04
L
Dieldrin
60-57-1
-
-
-
F '88
0.0005
0.0005
0.00005
0.002
-
0.0002
B2
Diethyl phthalate
84-66-2
-
-
-
-
-
-
0.8
30
-
-
D
1	Under review.
2	1998 Final Rule for Disinfectants and Disinfection By-products: The total for trihalomethanes is 0.08 mg/L.
3	1998 Final Rule for Disinfectants and Disinfection By-products: The total for five haloacetic acids is 0.06 mg/L.
4	The values for m-dichlorobenzene are based on data for o-dichlorobenzene.

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March 2018
Drinking Water Standards and Health Advisories
Page 4 of 12
(liemiciils
( ASRN
Number
Stiindiii'ds
Status HA
Document
Health Advisories
('nncer
Descriptor
Stsitus
Re".
MCLG
(mg/L)
MCL
(mg/L)
10-kg Child

One-day
(mg/L)
Tcn-diiv
(mg/L)
RID
(mg/kg/diiy)
DWEL
(mg/L)
Life-time
(mg/L)
mg/L at 104
('iincer Risk
Diisopropylmethylphosphonate
1445-75-6
-
-
-
F '89
8
8
0.08
3
0.6
-
D
Dimethrin
70-38-2
-
-
-
F '88
10
10
0.3
10
2
-
D
Dimethyl methylphosphonate
756-79-6
-
-
-
F '92
2
2
0.2
7
0.1
0.7
C
Dimethyl phthalate
131-11-3
-
-
-
-
-
-
-
-
-
-
D
Dinitrobenzene (1,3-)
99-65-0
-
-
-
F '91
0.04
0.04
0.0001
0.005
0.001
-
D
Dinitrotoluene (2,4-)
121-14-2
-
-
-
F '08
1
1
0.002
0.1
-
0.005
L
Dinitrotoluene (2,6-)
606-20-2
-
-
-
F '08
0.4
0.04
0.001
0.04
-
0.005
L
Dinitrotoluene (2,6 & 2,4)'

-
-
-
F '92
-
-
-
-
-
0.005
B2
Dinoseb
88-85-7
1;
0.007
0.007
F '88
0.3
0.3
0.001
0.035
0.007
-
D
Dioxane p-
123-9l-l
-
-
-
F '87
4
0.4
0.03
1
0.2
0.035
L
Diphenamid
957-51-7
-
-
-
F '88
0.3
0.3
0.03
1
0.2
-
D
Diquat
85-00-7
1;
0.02
0.02
-
-
-
0.005
0.02
-
-
E
Disulfoton
298-04-4
-
-
-
F '88
0.01
0.01
0.0001
0.0035
0.0007
-
E
Dithiane (1,4-)
505-29-3
-
-
-
F '92
0.4
0.4
0.01
0.4
0.08
-
D
Diuron
330-54-1
-
-
-
F '88
1
1
0.003
0.1
-
0.2
L
Endothall
145-73-3
1;
0.1
0.1
F '88
0.8
0.8
0.007
0.25
0.05
-
N
Endrin
72-20-8
1;
0.002
0.002
F '87
0.02
0.005
0.0003
0.01
0.002
-
I
Epichlorohydrin
106-89-8
1;
zero
TT2
F '87
0.1
0.1
0.002
0.07
-
0.3
B2
Ethylbenzene
100-41-4
1;
0.7
0.7
F '87
30
3
0.1
3
0.7
-
D
Ethylene dibromide (EDB)3
106-93-4
1;
zero
0.00005
F '87
0.008
0.008
0.009
0.3
-
0.002
L
Ethylene glycol
107-21-1
-
-
-
F '87
20
6
2
70
14
-
D
Ethylene Thiourea (ETU)
96-45-7
-
-
-
F '88
0.3
0.3
0.0002
0.007
-
0.06
B2
Fenamiphos
22224-92-6
-
-
-
F '88
0.009
0.009
0.0001
0.0035
0.0007
-
E
1	Technical grade.
2	When epichlorohydrin is used in drinking water systems, the combination (or product) of dose and monomer level shall not exceed that equivalent to an epichlorohydrin-based polymer
containing 0.01% monomer dosed at 20 mg/L.
3	1,2-dibromoethane.

-------
March 2018
Drinking Water Standards and Health Advisories
Page 5 of 12


Standards

Health Advisories







10-kg Child




Stsitus
MCLG
MCL
Status MA
Onc-dav
Ten-dav
RID
DWKL
I .it'e-time
mg/L at 10 4
(.'ancer
(liemicals
( AS Number
Reg.
(mg/L)
(mg/L)
Stiindiii'ds
(mg/L)
(mg/L)
(mg/kg/day)
(mg/L)
(mg/L)
Cancer Risk
Descriptor
Fluometuron
2164-17-2
-
-
-
F '88
2
2
0.01
0.5
0.09

D
Fluorene (PAH)
86-73-7
-
-
-
-
-
-
0.04
1
-
-
D
Fonofos
944-22-9
-
-
-
F '88
0.02
0.02
0.002
0.07
0.01
-
D
Formaldehyde
50-00-0
-
-
-
D '93
10
5
0.2
7
1
-
Bl1
Glyphosate
1071-83-6
F
0.7
0.7
F '88
20
20
2
70
-
-
D
Heptachlor
76-44-8
F
zero
0.0004
F '87
0.01
0.01
0.0005
0.02
-
0.0008
B2
Heptachlor epoxide
1024-57-3
F
zero
0.0002
F '87
0.01
-
0.00001
0.0004
-
0.0004
B2
Hexachlorobenzene
118-74-1
F
zero
0.001
F '87
0.05
0.05
0.0008
0.03
-
0.002
B2
Hexachlorobutadiene2
87-68-3
-
-
-
-
0.3
0.3
0.0003
0.01
-
0.09
L
Hexachlorocyclopentadiene
77-47-4
F
0.05
0.05
-
-
-
0.006
0.2
-
-
N
Hexachloroethane
67-72-1
-
-
-
F '91
5
5
0.001
0.04
0.001
0.3
C
Hexane (n-)
110-54-3
-
-
-
F '87
10
4
-
-
-
-
I
Hexazinone
51235-04-2
-
-
-
F '96
3
2
0.05
2
0.4
-
D
HMX3
2691-41-0
-
-
-
F '88
5
5
0.05
2
0.4
-
D
Indeno[l,2,3,-c,d]pyrene (PAH)
193-39-5
-
-
-
-
-
-
-
-
-
-
B2
Isophorone
78-59-1
-
-
-
F '92
15
15
0.2
7
0.1
4
C
Isopropyl methylphosphonate
1832-54-8
-
-
-
F '92
30
30
0.1
3.5
0.7
-
D
Isopropylbenzene (cumene)
98-82-8
-
-
-
D '87
11
11
0.1
4
-
-
D
Lindane4
58-89-9
F
0.0002
0.0002
F '87
1
1
0.005
0.2
-
-

Malathion
121-75-5
-
-
-
F '92
0.2
0.2
0.07
2
0.5
-
S
Maleic hydrazide
123-33-1
-
-
-
F '88
10
10
0.5
20
4
-
D
MCPA5
94-74-6
-
-
-
F '88
0.1
0.1
0.004
0.14
0.03
-
N
Methomyl
16752-77-5
-
-
-
F '88
0.3
0.3
0.025
0.9
0.2
-
E
Methoxychlor
72-43-5
F
0.04
0.04
F '87
0.05
0.05
0.005
0.2
0.04
-
D
Methyl ethyl ketone
78-93-3
-
-
-
F '87
75
7.5
0.6
20
4
-
D
Methyl parathion
298-00-0
-
-
-
F '88
0.3
0.3
0.0002
0.007
0.001
-
N
1	Carcinogenicity based on inhalation exposure.
2	Regulatory Determination Health Effects Support Document for Hexachlorobutadiene
(http://www.epa.gov/safewater/ccl/pdfs/reg determine 1/support ccl hexachlorobutadiene healtheffects.pdf).
3	HMX = octahydro-l,3,5,7-tetranitro-l,3,5,7-tetrazocine.
4	Lindane = y - hexachlorocyclohexane.
5	MCPA = 4 (chloro-2-methoxyphenoxy) acetic acid.

-------
March 2018
Drinking Water Standards and Health Advisories
Page 6 of 12


Standards

Health Advisories







10-kg Child



CASRN
Status
MCLG
MCL
Stiitus HA
One-day
Ten-day
RID
DWEL
Life-time
mg/L at 104
('ancer
Chemicals
Number
Reg.
(mg/L)
(mg/L)
Document
(mg/L)
(mg/L)
(mg/kg/day)
(mg/L)
(mg/L)
Cancer Risk
Descriptor
Metolachlor
51218-45-2
-
-
-
F '88
2
2
0.1
3.5
0.7
-
C
Metribuzin
21087-64-9
-
-
-
F '88
5
5
0.01
0.35
0.07
-
D
Monochloroacetic acid
79-11-8
1''
0.07
0.061
-
0.2
0.2
0.01
0.35
0.07
-
I
Monochlorobenzene
108-90-7
F
0.1
0.1
F '87
4
4
0.02
0.7
0.1
-
D
Naphthalene
91-20-3
-
-
-
F '90
0.5
0.5
0.02
0.7
0.1
-
I
Nitrocellulose2
9004-70-0
-
-
-
F '88
-
-
-
-
-
-
-
Nitroguanidine
556-88-7
-
-
-
F '90
10
10
0.1
3.5
0.7
-
D
Nitrophenol p-
100-02-7
-
-
-
F '92
0.8
0.8
0.008
0.3
0.06
-
D
N-nitrosodimethylamine

-
-
-
-
-
-
-
-
-
0.00007
B2
Oxamyl (Vydate)
23135-22-0
F
0.2
0.2
F '05
0.01
0.01
0.001
0.035

-
N
Paraquat
1910-42-5
-
-
-
F '88
0.1
0.1
0.0045
0.2
0.03
-
E
Pentachlorophenol
87-86-5
1'
zero
0.001
F '87
1
0.3
0.005
0.2
0.04
0.009
L
PI''OA
335-67-1
-
-
-
F '16
-
-
2 x 10"5
3.7 x 104
7 x 10"5
5 x 10"2
S
I'l l >S
1763-23-1
-
-
-
F ' 16
-
-
2 x 10"5
3.7 x 104
7 x 10"5
-
S
Phenanthrene (PAH)
85-01-8
-
-
-
-
-
-
-
-
-
-
D
Phenol
108-95-2
-
-
-
D '92
6
6
0.3
11
2
-
D
Picloram
1918-02-1
1''
0.5
0.5
F '88
20
20
0.02
0.7
-
-
D
Polychlorinated biphenyls (PCBs)
1336-36-3
F
zero
0.0005
D '93
-
-
-
-
-
0.01
B2
Prometon
1610-18-0
-
-
-
F '88
0.2
0.2
0.05
2
0.4
-
N
Pronamide
23950-58-5
-
-
-
F '88
0.8
0.8
0.08
3
-
0.1
B2
Propachlor
1918-16-7
-
-
-
F '88
0.5
0.5
0.05
2
-
0.1
L
Propazine
139-40-2
-
-
-
F '88
-
-
0.02
0.7
0.01
-
N
Propham
122-42-9
-
-
-
F '88
5
5
0.02
0.6
0.1
-
D
Pyrene (PAH)
129-00-0
-
-
-
-
-
-
0.03
-
-
-
D
RDX1
121-82-4
-
-
-
F '88
0.1
0.1
0.003
0.1
0.002
0.03
C
Simazine
122-34-9
F
0.004
0.004
F '88
-
-
0.02
0.7
-
-
N
Styrene
100-42-5
F
0.1
0.1
F '87
20
2
0.2
7
0.1
-
C
2,4,5-T (Trichlorophenoxy-acetic acid)
93-76-5
-
-
-
F '88
0.8
0.8
0.01
0.35
0.07
-
D
1	1998 Final Rule for Disinfectants and Disinfection By-products: the total for five haloacetic acids is 0.06 mg/L.
2	The Health Advisory Document for nitrocellulose does not include HA values and describes this compound as relatively nontoxic.
3	RDX = hexahydro -l,3,5-trinitro-l,3,5-triazine.

-------
March 2018
Drinking Water Standards and Health Advisories
Page 7 of 12
Chemicals
CASRN
Number
Stiindiii'ds
Status 11A
Document


Health
Advisories


Cancer
Descri ptor
Status
Re".
MCLG
(mg/L)
MCL
(mg/L)
10-kg Child

One-day
(mg/L)
Ten-dav
(mg/L)
RfD
(ing/kg/day)
DWEL
(mg/L)
Life-time
(mg/L)
mg/L at 10 4
Cancer Risk
2,3,7,8-TCDD (Dioxin)
1746-01-6
F
zero
3E-08
F '87
1E-06
1E-07
1E-09
4E-08
-
2E-08
B2
Tebuthiuron
34014-18-1
-
-
-
F '88
3
3
0.07
2
0.5
-
D
Terbacil
5902-51-2
-
-
-
F '88
0.3
0.3
0.01
0.4
0.09
-
E
Terbufos
13071-79-9
-
-
-
F '88
0.005
0.005
0.00005
0.002
0.0004
-
D
Tetrachloroethane (1,1,1,2-)
630-20-6
-
-
-
F '89
2
2
0.03
1
0.07
0.1
C
Tetrachloroethane (1,1,2,2-)
79-34-5
-
-
-
F '08
3
3
0.01
0.4
-
0.04
L
Tetrachloroethylene1
127-18-4
F
zero
0.005
F '87
2
2
0.01
0.5
0.01
-
-
Tetrachloroterephthalic acid
236-79-0
-
-
-
F '08
100
100
-
-
-
-
I
T richlorofluoromethane
75-69-4
-
-
-
F '89
7
7
0.3
10
2
-
D
Toluene
108-88-3
F
1
1
D '93
20
2
0.08
3
-
-
I
Toxaphene
8001-35-2
F
zero
0.003
F '96
0.004
0.004
0.0004
0.01
-
0.003
B2
2,4,5-TP (Silvex)
93-72-1
F
0.05
0.05
F '88
0.2
0.2
0.008
0.3
0.05
-
D
Trichloroacetic acid
76-03-9
F
0.02
0.062
-
3
3
0.03
1
0.02
-
S
Trichlorobenzene (1,2,4-)
120-82-1
F
0.07
0.07
F '89
0.1
0.1
0.01
0.35
0.07
-
D
Trichlorobenzene (1,3,5-)
108-70-3
-
-
-
F '89
0.6
0.6
0.006
0.2
0.04
-
D
T richloroethane (1,1,1-)
71-55-6
F
0.2
0.2
F '87
100
40
2
70
-
-
I
Trichloroethane (1,1,2-)
79-00-5
F
0.003
0.005
F '89
0.6
0.4
0.004
0.1
0.003
0.06
C
Trichloroethylene 1
79-01-6
F
zero
0.005
F '87
-
-
0.007
0.2
-
0.3
B2
Trichlorophenol (2,4,6-)
88-06-2
-
-
-
D '94
0.03
0.03
0.0003
0.01
-
0.3
B2
Trichloropropane (1,2,3-)
96-18-4
-
-
-
F '89
0.6
0.6
0.004
0.1
-
-
L
Trifluralin
1582-09-8
-
-
-
F '90
0.08
0.08
0.02
0.7
0.01
0.4
C
Trimethylbenzene (1,2,4-)
95-63-6
-
-
-
D '87
-
-
-
-
-
-
D
Trimethylbenzene (1,3,5-)
108-67-8
-
-
-
D '87
10
-
-
-
-
-
D
Trinitroglycerol
55-63-0
-
-
-
F '87
0.005
0.005
-
-
0.005
0.2
-
Trinitrotoluene (2,4,6-)
118-96-7
-
-
-
F '89
0.02
0.02
0.0005
0.02
0.002
0.1
C
Vinyl chloride
75-01-4
F
zero
0.002
F '87
3
3
0.003
0.1
-
0.002
H
Xylenes
1330-20-7
F
10
10
D '93
40
40
0.2
7
-
-
I
1	Under review.
2	1998 Final Rule for Disinfectants and Disinfection By-products: The total for five haloacetic acids is 0.06 mg/L.

-------
March 2018
Drinking Water Standards and Health Advisories
Page 8 of 12


Standards

Health Advisories







10-kg Child



( ASRN
Status
MCLG
MCL
Status HA
One-day
Tcn-dav
RfD
DWEL
Life-time
mg/L at 104
Cancer
Chemicals
Number
Reg.
(mg/L)
(mg/L)
Document
(mg/L)
(mg/L)
(mg/kg/day)
(mg/L)
(mg/L)
Cancer Risk
Descriptor
INORGANICS
Ammonia
7664-41-7
-
-
-
D '92
-
-
-
-
30
-
D
Antimony
7440-36-0
1;
0.006
0.006
F '92
0.01
0.01
0.0004
0.01
0.006
-
D
Arsenic
7440-38-2
lf
zero
0.01
-
-
-
0.0003
0.01
-
0.002
A
Asbestos (fibers/1 >10Fm length)
1332-21-4
1;
7 MFL1
7 MFL
-
-
-
-
-
-
700-MFL
A2
Barium
7440-39-3
I;
2
2
D '93
0.7
0.7
0.2
7
-
-
N
Beryllium
7440-41-7
1;
0.004
0.004
F '92
30
30
0.002
0.07
-
-
-
Boron
7440-42-8
-
-
-
F '08
3
3
0.2
7
6
-
I
Bromate
7789-38-0
1;
zero
0.01
D '98
0.2
-
0.004
0.14
-
0.005
B2
Cadmium
7440-43-9
F
0.005
0.005
F '87
0.04
0.04
0.0005
0.02
0.005
-
D
Chloramine3
10599-90-3
1;
44
44
D '95
-
-
0.1
3.5
3.0
-
-
Chlorine
7782-50-5
F
44
44
D '95
3
3
0.1
5
4
-
D
Chlorine dioxide
10049-04-4
1;
0.84
0.84
D '98
0.8
0.8
0.03
1
0.8
-
D
Chlorite
7758-19-2
F
0.8
1
D '98
0.8
0.8
0.03
1
0.8
-
D
Chromium (total)
7440-47-3
1;
0.1
0.1
F '87
1
1
0.003s
0.1
-
-
D
Copper (at tap)
7440-50-8
F
1.3
rJ,rp6
D '98
-
-
-
-
-
-
D
Cyanide
143-33-9
1;
0.2
0.2
F '87
0.2
0.2
0.0006
-
-
-
I
Fluoride
7681-49-4
F
4
4
-
_8
-
0.06'
-
-
-
-
Lead (at tap)
7439-92-1
1;
zero
TT6
-
-
-
-
-
-
-
B2
Manganese
7439-96-5
-
-
-
F"04
1
1
0.1410
1.6
0.3
-
D
Mercury (inorganic)
7487-94-7
1;
0.002
0.002
F '87
0.002
0.002
0.0003
0.01
0.002
-
D
Molybdenum
7439-98-7
-
-
-
D '93
0.08
0.08
0.005
0.2
0.04
-
D
Nickel
7440-02-0
F
-
-
F '95
1
1
0.02
0.7
0.1
-
-
1	MFL = million fibers per liter.
2	Carcinogenicity based on inhalation exposure.
3	Monochloramine; measured as free chlorine.
4	1998 Final Rule for Disinfectants and Disinfection By-products: MRDLG=Maximum Residual Disinfection Level Goal; and MRDL=Maximum Residual Disinfection Level.
5	IRIS value for chromium VI.
6	Copper action level 1.3 mg/L; lead action level 0.015 mg/L.
7	This RfD is for hydrogen cyanide.
8	In case of overfeed of the fluoridation chemical see CDC Guidelines in Engineering and Administrative Recommendations on Water Fluoridation
www.cdc.gov/mmwr/preview/mmwrhtml/00039178.htm. Elevated F levels > lOmg/L require action by the water system operator.
9	Based on dental fluorosis in children, a cosmetic effect. MCLG based on skeletal fluorosis.
10	Dietary manganese. The lifetime health advisory includes a 3 fold modifying factor to account for increased bioavailability from drinking water.

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March 2018
Drinking Water Standards and Health Advisories
Page 9 of 12


Stiindiii'ds



Health
Ulvisories









10-kg Child


( 'hcinicals
CASRN
Number
Stsitus
Reg.
MCLG
(mg/L)
MCL
(mg/L)
Status 11A
Document
Onc-diiv
(mg/L)
Ten-day
(mg/L)
RID
(ing/kg/day)
DWEL
(mg/L)
Life- time
(mg/L)
mg/L at 104
('ancer Risk
('ancer
Descriptor
Nitrate (as N)
14797-55-8
F
10
10
D '93
101
101
1.6
-
-
-
-
Nitrite (as N)
14797-65-0
1''
1
1
D '93
l1
l1
0.16
-
-
-
-
Nitrate + Nitrite (both as N)

1''
10
10
D '93
-
-
-
-
-
-
-
Perchlorate2
14797-73-0
-
-
-
I '08
-
-
0.007
0.025
0.015
-
L/N
Selenium
7782-49-2
1''
0.05
0.05
-
-
-
0.005
0.2
0.05
-
D
Silver
7440-22-4
-
-
-
F '92
0.2
0.2
0.0053
0.2
0.13
-
D
Strontium
7440-24-6
-
-
-
D '93
25
25
0.6
20
4
-
D
Thallium
7440-28-0
1''
0.0005
0.002
F '92
0.007
0.007
-
-
-
-
I
White phosphorous
7723-14-0
-
-
-
F '90
-
-
0.00002
0.0005
0.0001

D
Zinc
7440-66-6
-
-
-
D '93
6
6
0.3
10
2
-
I
RADIONUCLIDES












Beta particle and photon activity
(formerly man-made
radionuclides)

1''
zero
4 mrem/yr






4 mrem/yr
A
Gross alpha particle activity

1''
zero
15 pCi/L
-
-
-
-
-
-
15 pCi/L
A
Combined Radium 226 & 228
7440-14-4
F
zero
5 pCi/L
-
-
-
-
-
-
-
A
Radon
10043-92-2
P
zero
300 pCi/L
AMCL4
4000 pCi/L






150 pCi/L
A
Uranium
7440-61-1
1''
zero
0.03
-
-
-
0.00065
0.02
-
-
A
1	These values are calculated for a 4-kg infant and are protective for all age groups.
2	Subchronic value for pregnant women.
3	Based on a cosmetic effect.
4	AMCL = Alternative Maximum Contaminant Level.
5	Soluble uranium salts. Radionuclide Rule.

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Drinking Water Standards and Health Advisories
March 2018	Page 10 of 12
Secondary Drinking Water Regulations
Chemicals
CAS Number
Status
SDWR
Aluminum
7429-90-5
F
0.05 to 0.2 mg/L
Chloride
7647-14-5
F
250 mg/L
Color
NA
F
15 color units
Copper
7440-50-8
F
1.0 mg/L
Corrosivity
NA
F
non-corrosive
Fluoride
7681-49-4
F
2.0 mg/L
Foaming agents
NA
F
0.5 mg/L
Iron
7439-89-6
F
0.3 mg/L
Manganese
7439-96-5
F
0.05 mg/L
Odor
NA
F
3 threshold odor numbers
PH
NA
F
6.5-8.5
Silver
7440-22-4
F
0.1 mg/L
Sulfate
7757-82-6
F
250 mg/L
Total dissolved solids (TDS)
NA
F
500 mg/L
Zinc
7440-66-6
F
5 mg/L

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March 2018
Drinking Water Standards and Health Advisories
Microbiology
Page 11 of 12

Status Reg.
Status HA
Document
MCLG
MCL
Treatment Technique
Cryptosporidium
F
F 01
zero
TT
Systems that filter must remove 99% of
Cryptosporidium
Cylindrospermosin
-
F 15
-
-
-
Cyanobacterial Microcystin Toxins
-
F 15
-
-
-
Giardia iambiia
F
F 98
zero
TT
99.9% killed/inactivated
Legionella
F1
F 01
zero
TT
No limit; EPA believes that if Giardia and viruses
are inactivated, Legionella will also be controlled
Heterotrophic Plate Count (HPC)
F1
-
NA
TT
No more than 500 bacterial colonies per milliliter.
Mycobacteria
-
F 99
-
-
-
Total Conforms
F

zero
5%
No more than 5.0% samples total coliform-
positive in a month. Every sample that has total
conforms must be analyzed for fecal conforms;
no fecal conforms are allowed.
Turbidity
F
-
NA
TT
At no time can turbidity go above 5 NTU
(nephelometric turbidity units)
Viruses
F1
-
zero
TT
99.99% killed/inactivated
1 Regulated under the surface water treatment rule.

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Drinking Water Standards and Health Advisories
March 2018	Page 12 of 12
Drinking Water Advisory Table
Chemicals
Status
Health-based Value
Taste Threshold
Odor Threshold
Ammonia
D '92
Not Available
30 mg/L

Methyl tertiary butyl ether (MtBE)
F '98
Not Available
40 (ig/L
20 M-g/L
Sodium
F '03
20 mg/L (for individuals on a
500 mg/day restricted sodium diet).
30-60 mg/L

Sulfate
F '03
500 mg/L
250 mg/L

Taste Threshold: Concentration at which the majority of consumers do not notice an adverse taste in drinking water; it is recognized
that some sensitive individuals may detect a chemical at levels below this threshold.
Odor Threshold: Concentration at which the majority of consumers do not notice an adverse odor in drinking water; it is recognized
that some sensitive individuals may detect a chemical at levels below this threshold.

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