2011 Edition of the Drinking 

Water Standards and Health 

Advisories
2011 Edition of the Drinking Water 

Standards and Health Advisories 

EPA 820-R-11-002 

Office of Water 

U.S. Environmental Protection Agency 

Washington, DC 

Winter 2011 

Date of update: January, 2011 

Recycled/Recyclable 

Printed on paper that contains 

at least 50% recycled fiber.
i

The Drinking Water Standards and Health Advisories Tables are revised periodically by EPA’s 

Office of Water in order to update RfD and Cancer values so that they are consistent with the 

most current Agency assessments of chemical contaminants that may occur in drinking water 

and to introduce new Health Advisories. The following information should be kept in mind 

when using the 2011 Edition of the Tables: 

Reference dose (RfD) values are updated to reflect the values in the Integrated Risk 

Information System (IRIS) and the Office of Pesticide Programs (OPP) Reregistration 

Eligibility Decisions (RED) Documents. The Drinking Water Equivalent Level (DWEL) 

has been adjusted accordingly. Thus, both the RfD and DWEL in the Tables differ from 

the values in the Health Advisory document when the IRIS or OPP RfD is more recent 

than the Health Advisory document value. RfD values from IRIS that differ from the 

values in the Health Advisory documents are presented in BOLD type. Values derived 

from the REDs are given in BOLD italics. For unregulated chemicals with a recent IRIS 

or OPP RfD, the lifetime Health Advisory is calculated from the DWEL using the 

relative source contribution value published in the Health Advisory document. For 

regulated chemicals, no lifetime value is provided in the Tables when the revised lifetime 

value would differ from the Maximum Contaminant Level Goal (MCLG). 

The cancer group designation or cancer classification and 10-4 cancer risk values reflect 

those presently in IRIS or in the OPP RED. New IRIS cancer designations and 10-4

cancer risk values are presented in BOLD type and those derived from the REDs are in 

BOLD italics. 

The IRIS Toxicological Reviews can be accessed at: http://www.epa.gov/IRIS. The OPP 

REDs can be accessed at: http://www.epa.gov/pesticides/reregistration/status.htm.

In some cases there is a Health Advisory value for a contaminant but there is no reference 

to a Health Advisory document. These Health Advisory values can be found in the 

Drinking Water Criteria Document for the contaminant. 

With a few exceptions, the RfDs, Health Advisory, and cancer risk values have been 

rounded to one significant figure following the convention adopted by IRIS. 

The Drinking Water Standards and Health Advisories Tables may be reached from the Water 

Science home page at: http://www.epa.gov/waterscience/. The Tables are accessed under the 

Drinking Water icon. 

Copies 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 
ii

DEFINITIONS

The following definitions for terms used in the Tables are not all-encompassing, and should not 

be construed to be “official” definitions. They are intended to assist the user in understanding 

terms found on the following pages. 

Action Level: The concentration of a contaminant which, if exceeded, triggers treatment or other 

requirements which a water system must follow. 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, descriptive terms 

for carcinogenicity replace the earlier alpha numeric Cancer Group designations (US EPA 1986 

guidelines). The suggested descriptive terms 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 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). 

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. 

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 

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.
iii

Drinking Water Advisory: A nonregulatory concentration of a contaminant in water that is 

likely to be without adverse effects on health and aesthetics.

DWEL: Drinking Water Equivalent Level. A lifetime exposure concentration protective of 

adverse, non-cancer health effects, which assumes that all of the exposure to a contaminant is 

from drinking water.

HA: Health Advisory. An estimate of acceptable drinking water levels for a chemical substance 

based on health effects information; a Health Advisory 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 normally designed 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 normally designed 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. The Lifetime HA 

is based on exposure of a 70-kg adult consuming 2 liters of water per day. The Lifetime 

HA for Group C carcinogens includes an adjustment for possible carcinogenicity. 

MCLG: Maximum Contaminant Level Goal. A non-enforceable health goal which is set at a 

level at which no known or anticipated adverse effect on the health of persons occurs 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. 

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. 

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. 
iv

ABBREVIATIONS

D Draft 

F Final 

I Interim 

NA Not Applicable 

NOAEL No-Observed-Adverse-Effect Level 

OPP Office of Pesticide Programs 

P Proposed 

Pv Provisional 

Reg Regulation 

TT Treatment Technique 
Drinking Water Standards and Health Advisories

Winter 2011 

1

Standards Health Advisories

10-kg Child

Status 

CASRN Status MCLG MCL HA 

L

Chemicals Number Reg. (mg/L) (mg/L) Document 

One-day Ten-day RfD DWEL t

(mg/L) (mg/L) (mg/kg/day) (mg/L) (m

ORGANICSAcenaphthene 83-32-9 - - - - - - 0.06 2 - Acifluorfen (sodium) 62476-59-9 - - F ’88 2 2 0.01 0.4 - 

Acrylamide 79-06-1 F zero TT2 F ‘87 1.5 0.3 0.002 0.07 - 

Acrylonitrile 107-13-1 - - - - - - - - 

Alachlor 15972-60-8 F zero 0.002 F ‘88 0.1 0.1 0.01 0.4 - 

Aldicarb3 116-06-3 F4 0.001 0.003 F ‘95 0.01 0.01 0.001 0.035 0.00

Aldicarb sulfone3 1646-88-4 F4 0.001 0.002 F ‘95 0.01 0.01 0.001 0.035 0.00

3 Aldicarb sulfoxide 1646-87-3 F4 0.001 0.004 F ‘95 0.01 0.01 0.001 0.035 0.00

Aldrin 309-00-2 - - - F ‘92 0.0003 0.0003 0.00003 0.001 - 

Ametryn 834-12-8 - - - F ‘88 9 9 0.009 0.3 0.06 

Ammonium sulfamate 7773-06-0 - - - F ‘88 20 20 0.2 8 2 

Anthracene (PAH) 5 120-12-7 - - - - - - 0.3 10 - 

Atrazine 1912-24-9 F 0.003 0.003 F ‘88 - - 0.02 0.7 - 

Baygon 114-26-1 - - - F ‘88 0.04 0.04 0.004 0.1 0.00

Bentazon 25057-89-0 - - - F ‘99 0.3 0.3 0.03 1 0.2 

Benz[a]anthracene (PAH) 56-55-3 - - - - - - - - - 

Benzene 71-43-2 F zero 0.005 F ’87 0.2 0.2 0.004 0.1 - 

Benzo[a]pyrene (PAH) 50-32-8 F zero 0.0002 - - - - - - 

Benzo[b]fluoranthene (PAH) 205-99-2 - - - - - - - - - 

Benzo[g,h,i]perylene (PAH) 191-24-2 - - - - - - - - - 

Benzo[k]fluoranthene (PAH) 207-08-9 - - - - - - - - - 

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 

Bromobenzene 108-86-1 - - - D ‘86 4 4 0.008 0.3 0.07 

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 descripto

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 polyacryl

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. 
Drinking Water Standards and Health Advisories

Winter 2011 

 2

Chemicals 

CASRN 

Number 

Standards

Status 

HA 

Document 

Health Advisories

Status 

Reg. 

MCLG 

(mg/L) 

MCL 

(mg/L) 

10-kg Child

One-day 

(mg/L)

Ten-day 

(mg/L)

RfD 

(mg/kg/day)

DWEL 

(mg/L)

Lif

(m

Bromochloromethane 74-97-5 - - - F ‘89 50 1 0.01 0.5 0.0

Bromodichloromethane (THM) 75-27-4 F zero 0.081 - 1 0.6 0.003 0.1 - 

Bromoform (THM) 75-25-2 F zero 0.081 - 5 0.2 0.03 1 - 

Bromomethane 74-83-9 - - - D ‘89 0.1 0.1 0.001 0.05 0.0

Butyl benzyl phthalate 85-68-7 - - - - - - 0.2 7 - 

Butylate 2008-41-5 - - - F ‘89 2 2 0.05 2 0.4 

Carbaryl 63-25-2 - - - F ‘88 1 1 0.01 0.4 - 

Carbofuran 1563-66-2 F 0.04 0.04 F ‘87 - - 0.00006 - - 

Carbon tetrachloride 56-23-5 F zero 0.005 F ‘87 4 0.2 0.004 0.1 - 

Carboxin 5234-68-4 - - - F ‘88 1 1 0.1 3.5 0.7 

Chloramben 133-90-4 - - - F ‘88 3 3 0.015 0.5 0.1 

Chlordane 57-74-9 F zero 0.002 F ‘87 0.06 0.06 0.0005 0.02 - 

Chloroform (THM) 67-66-3 F 0.07 0.081 - 4 4 0.01 0.35 0.0

Chloromethane 74-87-3 - - - F ‘89 9 0.4 - - - 

Chlorophenol (2-) 95-57-8 - - - D ‘94 0.5 0.5 0.005 0.2 0.0

Chlorothalonil 1897-45-6 - - - F ‘88 0.2 0.2 0.015 0.5 - 

Chlorotoluene o- 95-49-8 - - - F ‘89 2 2 0.02 0.7 0.1 

Chlorotoluene p- 106-43-4 - - - F ‘89 2 2 0.02 0.7 0.1 

Chlorpyrifos 2921-88-2 - - - F ‘92 0.03 0.03 0.0003 0.01 0.0

Chrysene (PAH) 218-01-9 - - - - - - - - - 

Cyanazine 21725-46-2 - - - D ‘96 0.1 0.1 0.002 0.07 0.0

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

Winter 2011 

 3

Chemicals 

CASRN 

Number 

Standards

Status 

HA 

Document 

Health Advisories

Status 

Reg. 

MCLG 

(mg/L) 

MCL 

(mg/L) 

10-kg Child

One-day 

(mg/L) 

Ten-day 

(mg/L) 

RfD 

(mg/kg/day)

DWEL 

(mg/L) 

Lif

(m

1 Cyanogen chloride 506-77-4 - - - - 0.05 0.05 0.05 2 - 

2,4-D (2,4-dichlorophenoxyacetic acid) 94-75-7 F 0.07 0.07 F ‘87 1 0.3 0.005 0.2 - 

DCPA (Dacthal) 1861-32-1 - - - F ‘08 2 2 0.01 0.35 0.0

Dalapon (sodium salt) 75-99-0 F 0.2 0.2 F ‘89 3 3 0.03 0.9 0.2 

Di(2-ethylhexyl)adipate 103-23-1 F 0.4 0.4 - 20 20 0.6 20 0.4 

Di(2-ethylhexyl)phthalate 117-81-7 F zero 0.006 - - - 0.02 0.7 - 

Diazinon 333-41-5 - - - F ‘88 0.02 0.02 0.0002 0.007 0.0

Dibromochloromethane (THM) 124-48-1 F 0.06 0.082 - 0.6 0.6 0.02 0.7 0.0

Dibromochloropropane (DBCP) 96-12-8 F zero 0.0002 F ’87 0.2 0.05 - - - 

Dibutyl phthalate 84-74-2 - - - - - - 0.1 4 - 

Dicamba 1918-00-9 - - - F ‘88 - - 0.5 18 4 

Dichloroacetic acid 76-43-6 F zero 0.063 - 5 5 0.004 0.1 - 

Dichlorobenzene o- 95-50-1 F 0.6 0.6 F ‘87 9 9 0.09 3 0.6 

 4 Dichlorobenzene — 541-73-1 - - - F ‘87 9 9 0.09 3 0.6 

Dichlorobenzene p- 106-46-7 F 0.075 0.075 F ‘87 11 11 0.1 4 0.0

Dichlorodifluoromethane 75-71-8 - - - F ’89 40 40 0.2 5 1 

Dichloroethane (1,2-) 107-06-2 F zero 0.005 F ‘87 0.7 0.7 - - - 

Dichloroethylene (1,1-) 75-35-4 F 0.007 0.007 F ‘87 2 1 0.05 2 - 

Dichloroethylene (cis-1,2-) 156-59-2 F 0.07 0.07 F ‘90 4 1 0.002 0.07 - 

Dichloroethylene (trans-1,2-) 156-60-5 F 0.1 0.1 F ‘87 20 1 0.02 0.7 0.1 

Dichloromethane 75-09-2 F zero 0.005 D ‘93 10 2 0.06 2 - 

Dichlorophenol (2,4-) 120-83-2 - - - D ‘94 0.03 0.03 0.003 0.1 0.0

Dichloropropane (1,2-) 78-87-5 F zero 0.005 F ’87 - 0.09 - - - 

Dichloropropene (1,3-) 542-75-6 - - - F ‘88 0.03 0.03 0.03 1 - 

Dieldrin 60-57-1 - - - F ‘88 0.0005 0.0005 0.00005 0.002 - 

Diethyl phthalate 84-66-2 - - - - - - 0.8 30 - 

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. 
Drinking Water Standards and Health Advisories

Winter 2011 

 4

Standards Health Advisories

10-kg Child

Status 

CASRN Status MCLG MCL HA One-day Ten-day RfD DWEL Lif

Chemicals Number Reg. (mg/L) (mg/L) Document (mg/L) (mg/L) (mg/kg/day) (mg/L) (m

- - - Diisopropyl methylphosphonate 1445-75-6 F ‘89 8 8 0.08 3 0.6 - Dimethrin 70-38-2 - - F ‘88 10 10 0.3 10 2 - Dimethyl methylphosphonate 756-79-6 - - F ‘92 2 2 0.2 7 0.1 - Dimethyl phthalate 131-11-3 - - - - - - - - - Dinitrobenzene (1,3-) 99-65-0 - - F ‘91 0.04 0.04 0.0001 0.005 0.0- Dinitrotoluene (2,4-) 121-14-2 - - F ‘08 1 1 0.002 0.1 - - Dinitrotoluene (2,6-) 606-20-2 - - F ‘08 0.4 0.04 0.001 0.04 - 

Dinitrotoluene (2,6 & 2,4) 1 - - - F ‘92 - - - - - 

Dinoseb 88-85-7 F 0.007 0.007 F ‘88 0.3 0.3 0.001 0.035 0.0

Dioxane p- 123-91-1 - - - F ‘87 4 0.4 0.03 1 0.2 Diphenamid 957-51-7 - - - F ‘88 0.3 0.3 0.03 1 0.2 

Diquat 85-00-7 F 0.02 0.02 - - - 0.005 0.02 - 

Disulfoton 298-04-4 - - - F ‘88 0.01 0.01 0.0001 0.0035 0.0

Dithiane (1,4-) 505-29-3 - - - F ‘92 0.4 0.4 0.01 0.4 0.0

Diuron 330-54-1 - - - F ‘88 1 1 0.003 0.1 - 

Endothall 145-73-3 F 0.1 0.1 F ‘88 0.8 0.8 0.007 0.25 0.0

Endrin 72-20-8 F 0.002 0.002 F ‘87 0.02 0.005 0.0003 0.01 0.0

Epichlorohydrin 106-89-8 F zero TT2 F ‘87 0.1 0.1 0.002 0.07 - 

Ethylbenzene 100-41-4 F 0.7 0.7 F ‘87 30 3 0.1 3 0.7 

Ethylene dibromide (EDB)3 106-93-4 F zero 0.00005 F ‘87 0.008 0.008 0.009 0.3 - 

Ethylene glycol 107-21-1 - - - F ‘87 20 6 2 70 14 

Ethylene Thiourea (ETU) 96-45-7 - - - F ‘88 0.3 0.3 0.0002 0.007 - 

Fenamiphos 22224-92-6 - - - F ‘88 0.009 0.009 0.0001 0.0035 0.0

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 epic

containing 0.01% monomer dosed at 20 mg/L. 3 1,2-dibromoethane.
Drinking Water Standards and Health Advisories

Winter 2011 

5

Chemicals CAS Number 

Standards

Status 

HA 

Standards 

Health Advisories

Status 

Reg. 

MCLG 

(mg/L) 

MCL 

(mg/L) 

10-kg Child

One-day 

(mg/L) 

Ten-day 

(mg/L) 

RfD 

(mg/kg/day) 

DWEL 

(mg/L) 

Lif

(m

Fluometuron 2164-17-2 - - - F ‘88 2 2 0.01 0.5 0.0Fluorene (PAH) 86-73-7 - - - - - - 0.04 1 - 

Fonofos 944-22-9 - - - F ‘88 0.02 0.02 0.002 0.07 0.0

Formaldehyde 50-00-0 - - - D ‘93 10 5 0.2 7 1 

Glyphosate 1071-83-6 F 0.7 0.7 F ‘88 20 20 2 70 - 

Heptachlor 76-44-8 F zero 0.0004 F ‘87 0.01 0.01 0.0005 0.02 - 

Heptachlor epoxide 1024-57-3 F zero 0.0002 F ‘87 0.01 - 0.00001 0.0004 - 

Hexachlorobenzene 118-74-1 F zero 0.001 F ‘87 0.05 0.05 0.0008 0.03 - 

Hexachlorobutadiene2 87-68-3 - - - - 0.3 0.3 0.0003 0.01 - 

Hexachlorocyclopentadiene 77-47-4 F 0.05 0.05 - - - 0.006 0.2 - 

Hexachloroethane 67-72-1 - - - F ‘91 5 5 0.001 0.04 0.0

Hexane (n-) 110-54-3 - - - F ‘87 10 4 - - - 

Hexazinone 51235-04-2 - - - F ‘96 3 2 0.05 2 0.4 

HMX3 2691-41-0 - - - F ‘88 5 5 0.05 2 0.4 

Indeno[1,2,3,-c,d]pyrene (PAH) 193-39-5 - - - - - - - - - 

Isophorone 78-59-1 - - - F ‘92 15 15 0.2 7 0.1 

Isopropyl methylphosphonate 1832-54-8 - - - F ‘92 30 30 0.1 3.5 0.7 

Isopropylbenzene (cumene) 98-82-8 - - - D ‘87 11 11 0.1 4 - 

Lindane 4 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 

Maleic hydrazide 123-33-1 - - - F ‘88 10 10 0.5 20 4 

MCPA 5 94-74-6 - - - F ‘88 0.1 0.1 0.004 0.14 0.0Methomyl 16752-77-5 - - - F ‘88 0.3 0.3 0.025 0.9 0.2 

Methoxychlor 72-43-5 F 0.04 0.04 F ‘87 0.05 0.05 0.005 0.2 0.0

Methyl ethyl ketone 78-93-3 - - - F ‘87 75 7.5 0.6 20 4 Methyl parathion 298-00-0 - - - F ‘88 0.3 0.3 0.0002 0.007 0.0

1 Carcinogenicity based on inhalation exposure. 2 Regulatory Determination Health Effects Support Document for Hexachlorobutadiene 

(http://www.epa.gov/safewater/ccl/pdfs/reg_determine1/support_cc1_hexachlorobutadiene_healtheffects.pdf). 3 HMX = octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine. 4 Lindane = γ − hexachlorocyclohexane. 5 MCPA = 4 (chloro-2-methoxyphenoxy) acetic acid. 
Drinking Water Standards and Health Advisories

Winter 2011 

6

Chemicals 

CASRN 

Number 

Standards

Status 

HA 

Document 

Health Advisories

Status 

Reg. 

MCLG 

(mg/L) 

MCL 

(mg/L) 

10-kg Child

One-day 

(mg/L) 

Ten-day 

(mg/L) 

RfD 

(mg/kg/day)

DWEL 

(mg/L) 

Lif

(m

Metolachlor 51218-45-2 - - - F ‘88 2 2 0.1 3.5 0.7 

Metribuzin 21087-64-9 - - - F ‘88 5 5 0.01 0.35 0.0

Monochloroacetic acid 79-11-8 F 0.03 0.061 - 0.2 0.2 0.01 0.35 0.0

Monochlorobenzene 108-90-7 F 0.1 0.1 F ‘87 4 4 0.02 0.7 0.1 

Naphthalene 91-20-3 - - - F ‘90 0.5 0.5 0.02 0.7 0.1 

Nitrocellulose2 9004-70-0 - - - F ‘88 - - - - - 

Nitroguanidine 556-88-7 - - - F ‘90 10 10 0.1 3.5 0.7 

Nitrophenol p- 100-02-7 - - - F ‘92 0.8 0.8 0.008 0.3 0.0

N-nitrosodimethylamine - - - - - - - - - 

Oxamyl (Vydate) 23135-22-0 F 0.2 0.2 F ‘05 0.01 0.01 0.001 0.035 

Paraquat 1910-42-5 - - - F ‘88 0.1 0.1 0.0045 0.2 0.0

Pentachlorophenol 87-86-5 F zero 0.001 F ‘87 1 0.3 0.005 0.2 0.0PFOA3 335-67-1 - - - Pv ‘09 - - - - - 

PFOS4 1763-23-1 - - - Pv ‘09 - - - - - 

Phenanthrene (PAH) 85-01-8 - - - - - - - - - 

Phenol 108-95-2 - - - D ‘92 6 6 0.3 11 2 Picloram 1918-02-1 F 0.5 0.5 F ‘88 20 20 0.02 0.7 - Polychlorinated biphenyls (PCBs) 1336-36-3 F zero 0.0005 D ‘93 - - - - - 

Prometon 1610-18-0 - - - F ‘88 0.2 0.2 0.05 2 0.4 

Pronamide 23950-58-5 - - - F ‘88 0.8 0.8 0.08 3 - 

Propachlor 1918-16-7 - - - F ‘88 0.5 0.5 0.05 2 - 

Propazine 139-40-2 - - - F ‘88 - - 0.02 0.7 0.0

Propham 122-42-9 - - - F ‘88 5 5 0.02 0.6 0.1 Pyrene (PAH) 129-00-0 - - - - - - 0.03 - - RDX5 121-82-4 - - - F ‘88 0.1 0.1 0.003 0.1 0.0

Simazine 122-34-9 F 0.004 0.004 F ‘88 - - 0.02 0.7 - 

Styrene 100-42-5 F 0.1 0.1 F ‘87 20 2 0.2 7 0.1 

2,4,5-T (Trichlorophenoxy-acetic 93-76-5 - - - F ‘88 0.8 0.8 0.01 0.35 0.0

acid)

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 Perfluorooctanoic Acid. Provisional short-term value 0.0004 mg/L. 4 Perfluorooctane Sulfonate. Provisional short-term value 0.0002 mg/L. 5 RDX = hexahydro -1,3,5-trinitro-1,3,5-triazine. 
Drinking Water Standards and Health Advisories

Winter 2011 

7

Standards Health Advisories

Chemicals 

CASRN 

Number 

Status 

Reg. 

MCLG 

(mg/L) 

MCL 

(mg/L) 

Status 

HA 

Document 

10-kg Child

One-day 

(mg/L) 

Ten-day 

(mg/L) 

RfD 

(mg/kg/day)

DWEL 

(mg/L) 

L

(

2,3,7,8-TCDD (Dioxin) 1746-01-6 F zero 3E-08 F ’87 1E-06 1E-07 1E-09 4E-08 - 

Tebuthiuron 34014-18-1 - - - F ‘88 3 3 0.07 2 0

Terbacil 5902-51-2 - - - F ‘88 0.3 0.3 0.01 0.4 0Terbufos 13071-79-9 - - - F ‘88 0.005 0.005 0.00005 0.002 0

Tetrachloroethane (1,1,1,2-) 630-20-6 - - - F ‘89 2 2 0.03 1 0

Tetrachloroethane (1,1,2,2-) 79-34-5 - - - F ‘08 3 3 0.01 0.4 - 

Tetrachloroethylene1 127-18-4 F zero 0.005 F ‘87 2 2 0.01 0.5 0

Tetrachloroterephthalic acid 236-79-0 - - - F ‘08 100 100 - - - 

Trichlorofluoromethane 75-69-4 - - - F ‘89 7 7 0.3 10 2 

Toluene 108-88-3 F 1 1 D ‘93 20 2 0.08 3 - 

Toxaphene 8001-35-2 F zero 0.003 F ‘96 0.004 0.004 0.0004 0.01 - 

2,4,5-TP (Silvex) 93-72-1 F 0.05 0.05 F ‘88 0.2 0.2 0.008 0.3 0

Trichloroacetic acid 76-03-9 F 0.02 0.062 - 3 3 0.03 1 0

Trichlorobenzene (1,2,4-) 120-82-1 F 0.07 0.07 F ‘89 0.1 0.1 0.01 0.35 0

Trichlorobenzene (1,3,5-) 108-70-3 - - - F ‘89 0.6 0.6 0.006 0.2 0Trichloroethane (1,1,1-) 71-55-6 F 0.2 0.2 F ‘87 100 40 2 70 - 

Trichloroethane (1,1,2-) 79-00-5 F 0.003 0.005 F ‘89 0.6 0.4 0.004 0.1 0

Trichloroethylene 1 79-01-6 F zero 0.005 F ‘87 - - 0.007 0.2 - 

Trichlorophenol (2,4,6-) 88-06-2 - - - D ‘94 0.03 0.03 0.0003 0.01 - Trichloropropane (1,2,3-) 96-18-4 - - - F ‘89 0.6 0.6 0.004 0.1 - 

Trifluralin 1582-09-8 - - - F ‘90 0.08 0.08 0.02 0.7 0Trimethylbenzene (1,2,4-) 95-63-6 - - - D ‘87 - - - - - 

Trimethylbenzene (1,3,5-) 108-67-8 - - - D ‘87 10 - - - - Trinitroglycerol 55-63-0 - - - F ‘87 0.005 0.005 - - 0

Trinitrotoluene (2,4,6-) 118-96-7 - - - F ‘89 0.02 0.02 0.0005 0.02 0

Vinyl chloride 75-01-4 F zero 0.002 F ‘87 3 3 0.003 0.1 - 

Xylenes 1330-20-7 F 10 10 D ‘93 40 40 0.2 7 - 

1 Under review. 2 1998 Final Rule for Disinfectants and Disinfection By-products: The total for five haloacetic acids is 0.06 mg/L. 
Drinking Water Standards and Health Advisories

Winter 2011 

 8

Standards Health Advisories

10-kg Child

CASRN Status MCLG MCL Status One-day Ten-day RfD DWEL L

Chemicals Number Reg. (mg/L) (mg/L) HA Document (mg/L) (mg/L) (mg/kg/day) (mg/L) (

INORGANICSAmmonia 7664-41-7 - - - D ‘92 - - - - 

Antimony 7440-36-0 F 0.006 0.006 F ‘92 0.01 0.01 0.0004 0.01 Arsenic 7440-38-2 F zero 0.01 - - - 0.0003 0.01 

Asbestos (fibers/l >10

Fm length) 1332-21-4 F 7 MFL1 7 MFL - - - - - 

Barium 7440-39-3 F 2 2 D ‘93 0.7 0.7 0.2 7 

Beryllium 7440-41-7 F 0.004 0.004 F ‘92 30 30 0.002 0.07 

Boron 7440-42-8 - - - F ‘08 3 3 0.2 7 

Bromate 7789-38-0 F zero 0.01 D ‘98 0.2 - 0.004 0.14 

Cadmium 7440-43-9 F 0.005 0.005 F ’87 0.04 0.04 0.0005 0.02 

Chloramine3 10599-90-3 F 44 44 D ‘95 - - 0.1 3.5 Chlorine 7782-50-5 F 44 44 D ‘95 3 3 0.1 5 Chlorine dioxide 10049-04-4 F 0.84 0.84 D ‘98 0.8 0.8 0.03 1 Chlorite 7758-19-2 F 0.8 1 D ‘98 0.8 0.8 0.03 1 Chromium (total) 7440-47-3 F 0.1 0.1 F ‘87 1 1 0.0035 0.1 

Copper (at tap) 7440-50-8 F 1.3 TT6 D ‘98 - - - - 

Cyanide 143-33-9 F 0.2 0.2 F ‘87 0.2 0.2 0.00067 - 

8 - 

Fluoride 7681-49-4 F 4 4 - - - 0.069Lead (at tap) 7439-92-1 F zero TT6 - - - - - 

Manganese 7439-96-5 - - - F”04 1 1 0.1410 1.6 

Mercury (inorganic) 7487-94-7 F 0.002 0.002 F ‘87 0.002 0.002 0.0003 0.01 

Molybdenum 7439-98-7 - - - D ‘93 0.08 0.08 0.005 0.2 Nickel 7440-02-0 F - - F ‘95 1 1 0.02 0.7 

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 D5 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 ≥ 10mg/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. 
Drinking Water Standards and Health Advisories

Winter 2011 

 9

Chemicals 

CASRN 

Number 

Standards

Status 

HA 

Document 

Health Advisories

Status 

Reg. 

MCLG 

(mg/L) 

MCL 

(mg/L) 

10-kg Child

One-day 

(mg/L) 

Ten-day 

(mg/L) 

RfD 

(mg/kg/day)

DWEL 

(mg/L) 

(

Nitrate (as N)Nitrite (as N)Nitrate + Nitrite (both as N)Perchlorate2

Selenium

SilverStrontiumThalliumWhite phosphorousZincRADIONUCLIDESBeta particle and photon  activity (formerly  man-made radionuclides) Gross alpha particle activity Combined Radium 226 & 228 RadonUranium

14797-55-814797-65-014797-73-0 7782-49-27440-22-47440-24-67440-28-07723-14-07440-66-67440-14-410043-92-27440-61-1

FF

 F

- 

F

--

F

--

FFFPF

10110- 0.05--0.0005--

zerozerozerozerozero

10

110- 0.05-

-

0.002

-

-

4 mrem/ 

yr

15 pCi/L

5 pCi/L

300 pCi/L AMCL4

4000 pCi/L0.03

D ‘93D ‘93

D ‘93

I ‘08 

-

F ‘92

D ‘93

F ‘92F ‘90

D ‘93

-----

101

11

-- 

-

0.2250.007-6

-----

101

11

-

- 

-

0.2

25

0.007

-

6-

-

-

-

-

1.60.16-0.007 0.0050.00530.6-0.000020.3----0.00065

---0.025 0.20.220-

0.0005

10

----0.02

---000

4-

0

2

-----

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. 
 10

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 nu

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
Winter 2011 

 11

Microbiology

Status Reg.

Status HA Document MCLG MCL Treatment Technique

Cryptosporidium F F 01 - TT Systems that filter mus

99% of Cryptosporidiu

Giardia lamblia F F 98 - TT 99.9% killed/inactivate

Legionella F1 F 01 zero TT No limit; EPA believes 

Giardia and viruses arLegionella will also be 

Heterotrophic Plate Count (HPC)

F1 - NA TT No more than 500 bac

colonies per milliliter.

Mycobacteria - F 99 - - -

Total Coliforms F - zero 5% No more than 5.0% sa

coliform-positive in a msample that has total cbe analyzed for fecal cfecal coliforms are allo

Turbidity F - NA TT At no time can turbidity 

NTU (nephelometric tu

Viruses F1 - zero TT 99.99% killed/inactivat

1 Regulated under the surface water treatment rule.
 12

Drinking Water Advisory Table

Chemicals Status Health-based Value

Taste Threshold

Odor Thresho

Ammonia D ‘92 Not Available 30 mg/LMethyl tertiary butyl ether (MtBE) F ‘98 Not Available 40 

μg/L 20 

μg/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 waterecognized 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 waterrecognized that some sensitive individuals may detect a chemical at levels below this threshold.