Monday
.January 14, 1991
Part V
Environmental
Protection Agency
Priority List of Substances Which May
Require Regulation Under the Safe
Drinking Water Act; Notice
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1470
•Federal Register / Vol.' 58, No/9 / Monday. January 14, 1991 / Notices
ENVIRONMENTAL PROTECTION
AGENCY
IOW-FRL-38S6-5) •;'•••
Priority Ust of Substances Which May
Rtqulre Regulation Under the Safe
Drinking Water Act
AGENCY: Environmental Protection
Agency (EPA).
ACTION: Notice. • • -. .
SUMMARY: The Safe Drinking Water Act
as amended in 1986 requires EPA to
publish a triennial list of contaminants
which are known or anticipated to occur.
in drinking water and which may
require regulation under the Act The
Drinking Water Priority List (DWPL)
serves as a list of candidate
contaminants for regulation under the
Act EPA published the first DWPL
containing 53 contaminants/
contaminant groups on January 22,1988.
The present notice establishes a revised
DWPL (1991 version) of "candidates" for
future regulations. The list is comprised
of 50 substances carried over from the
1988 DWPL and 27 new substances..The
total number of contaminants/
contaminant groups on the revised '
DWPLis77. . '
DATEST This notice is effective
immediately.
ADDRESSES: References and supporting
documentation for new substances
selected for the list are in the public
docket. Supporting documents for the
substances carried over from the 1988
list are not being made available again.
The docket clerk's office is located in
the Criteria and Standards Division.
Office of Drinking Water, U.S. :
Environmental Protection Agency, 401M
Street, SW« Washington, DC 20460. The
docket is open from 9 a.m. to 3:30 p.m.,•
Monday through Friday, except legal
holidays. Please call 202-382-3027 for art
appointment to inspect the docket.
FOR FURTHER INFORMATION CONTACT: ,
JItendra Saxena, Ph.D., Criteria and
Standards Division. Office of Drinking
Water (WH-550D), U.S. Environmental
Protection Agency, 401M Street. SW.,
Washington, DC 20460. phone 202-475-,.
9579. General information may also be •
obtained from the EPA Drinking Water
Hotline. The toll-free number is B00-426rr.
4791; the local number is 202-382-5533. '
EPA Regional Offices • • • . • •
L JFKfFederal'Bldg., room 2203; Boston,'.
MA 02203, Phone; (617) 85373610,",
Jerome'Healey. ''..'."'" ' ' ' .'.'.
H. 28 Federal Plaza, room 824. New ".": ".;
York/NV'i0278,'Phb.rie.'(212) 264^' I ;:
1800, Walter Andrews. • "''" '
m. 841 Chestnut Street; Philadelphia. PA
19107, Phone: (215) 597-8227, Jon
• . Capacasa. '•«-'. • -
IV. 345:Courtlaiid Street ME., Atlanta. .
GA 30365, Phone: (404) 347-3866. ;
James Kutzman. ' .
V."230 Dearborn Street, Chicago, EL
60604.' Phone: (312) 353-2151, -
Edward P. Watters.
VI. 1445 Ross Avenue, Dallas, TX 75202,
Phone: (214) 255-7150. Oscar Cabra.
• Vn. 726 Minnesota Ave., Kansas City,
KS 66101, Phone: (913) 551-7032, ..
Ralph Langemeier. . • ; '
Vffl. One Denver Place, 99918th Street
suite 500, Denver, CO 80202, Phone:"
(303) 294-7005, Patrick Grotty..
DC. 74 Hawthorne Street, San Francisco,
CA 94105, Phone: (415) 774-2250,
Steve Pardieck. •
X. 1200 Sixth Avenue, Seattle, WA
98101, Phone: (206) 399-4092, Jan
Hastings. '
SUPPLEMENTARY INFORMATION: " '
Table of Contents
I. Background . .
n. Selection of Contaminants for the Revised
Drinking Water Priority List .
A. 1988 Drinking Water Priority List .
B. Lists of Substances Considered for " .
Revision of the Drinking Water Priority
List
1. SARA Priority last •
2. Pesticides Registered Under FIFRA -
a. Pesticides Selected Based on the Results
of the National Pesticides Survey
b. Pesticides Selected Based on Their
Leaching Potential
3. Substances Recommended by States and
EPA Regions
m. 1991 Version of the Drinking Water
Priority List • . • -
IV. Future Revisions of the Drinking Water -.-'•
Priority List . ...
V. Other Requirements . . • ,.;
A. Executive Order 12291 .
B. Regulatory Flexibility Act
C. Paperwork Reduction Act
VL* References • - • ' , . .
Abbreviations Used In this Notice .. '.
ATSDR: Agency for Toxic Substances and,
Disease Registry , •• • '
CERCLA: Comprehensive Environmental
Response, Compensation, and Liability . .
Act (Superfund)
DWPL: Drinking Water Priority List' -.""..:
FIFRAi Federal Insecticide,' Fungicide and
Rodertticide Act
FSTRAC: Federal-State Toxicology and
Regulatory Alliance Committee
MCL: Maximum Contaminant Level , .. ...
MCLG: Maximum Contaminant Level Goal . .•
NPL: National Priority list (Superfund)
NFS: National Pesticidea Survey .'.
NTP: National Toxicology Program ' •" ' '* '•
NPDWR.-:National Primary Drinking Water '
Regulation (includes both Interim and '' •
Revised National Primary-Drinking-- '•>••: f.
WaterRegulations). - .-.J.j-. ;. .,:'• v-.-'-V' -j
ODWtQffice'of Drinking Water. -::•,=._ ;••;,,-
SARA: Superfund Ajnendments and., >!-„ ,. -,f
Re'a'uthofizatibri Act"' • " " " -.''.:
SDWA: Safe Drinking Water Act, also
referred to as "the Act," as amended in .
198a . . • ....-.'
SMCL; Secondary Maximum Contaminant'
Level .
TRI: Toxics Release Inventory
VOC: Volatile Organic Chemical
L Background
The Safe Drinking Water Act,{SDWA
or "the Act"), as amended in 1986,
• requires the Environmental Protection
Agency (EPA) to publish a triennial list
of contaminants ("Drinking Water
Priority List" or DWPL) which are -
known or anticipated to occur in
drinking water and which may require
regulation under the Act .[section .
1412(b)(3)(A)]. EPA must propose
National Primary Drinking Water •
Regulations (NPDWRs) for at least 25
contaminants on'the DWPL within 24
months after publication of each
triennial list and promulgate 25
NPDWRs Within 36 months of
publication of each triennial list. Under
section 1401 of the Act, the NPDWRs are
to include maximum contaminant levels
(MCLs) and "criteria and procedures to
assure a supply of drinking water which
dependably complies" with such MCLs.
If it is not economically or technically
feasible to ascertain the level of a
.contaminant in drinking water, EPA may
require the use of a treatment technique
instead of an MCL
In selecting contaminants for the list,
EPA must consider, at a minimum,
substances referred to in section 101(14)
of the Comprehensive Environmental
Response, Compensation and Liability
Act of 1980 (CERCLA or "Superfund")
and pesticides registered wider the
Federal Insecticide, Fungicide, and
Rodenticide Act (FIFRA). The Act also
requires EPA to form an advisory' group
to assist in developing the DWPL! This
group must include, but.not be limited
to, participants from the National
Toxicology Program and the EPA offices
of Drinking Water, Pesticides and Toxic
Substances, Ground Water, and Solid
, Waste and Emergency Response, and
• other offices deemed appropriate by the
Administrator. . • . •'
; The first Drinking Water Priority List
was published by EPA on January 22,
1988 (53 FR1892). The.li.st consisted of :
53 contaminants/contaminant groups, ,.•„.
and included the seven substances ,
which were removed from the original
statutory list of 83 contaminants. Other.. ,
contaminants placed on the list included
disinfectants and. their .by-products,,-;,,;,-.,
priority contaminants developed under..,,
• the Superfund Amendments and . , -:.,,
Reauthorization Act (SARA)< design; -••
analytes.of the EPA National. Pesticides ..
Survey (NPS), unregulated contaminants
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Federal Register / Vol. 56, No. 9 / Monday, January 14, 1991 / Notices
1471
monitored under section 1445 of the
SDWA, and certain substances reported
frequently and at high concentrations in
drinking water surveys. . -
EPA is complying with SDWA
requirements for publication of a .
triennial list of contaminants by revising
and updating the 1988 DWPL. EPA
believes that the DWPL is simply a list
of "candidates" for regulation. These .
"candidates" include substances which
are known or anticipated to occur in
- drinking water and which may require ,
regulation under the Act. Some
substances are placed on the list
because they clearly present a health
risk; others will require further
investigation before the need for
regulation is clear. With .this approach,
the DWPL will be a flexible tool which
is reviewed and revised every three •.
years. Contaminants which no longer
meet the EPA's DWPL criteria, or which
have been regulated since being placed
on the list, can be dropped, and new
high-priority drinking water
contaminants can be added to the list
when it is revised. . . .
This notice establishes a revised list
of "candidate" contaminants for future
regulation. EPA has not yet promulgated
NPDWRs for any contaminants from the
1988 list. Fifty substances from the 1988
list which continue to meet the DWPL
criteria have been carried forward to the
1991 list. Three substances from the 1988
list have been dropped (s.ee discussion.
below). .Twenty-seven new drinking
water contaminants have been added.
This notice was developed with the
assistance of the DWPL workgroup. The
workgroup was chaired by the Criteria
and Standards Division, Office of -
Drinking Water. The workgroup
consisted of representatives from the
EPA offices of Pesticides and Toxic
Substances, Ground Water, Solid Waste
and Emergency Response, and other
programs within the Agency; the
National Toxicology Program (NTP); the
U.S. Geological Survey; and the Agency
for .Toxic Substances and Disease'' •. •
; .Registry (ATSDR). • -; •
II. 'Selection of Contaminants for the ;
. Revised Drinking Water Priority List • : .
; Drinking-water contamination !
generally occurs from: (a) Contaminants
that find their way into drinking water
sources froin industrial waste, ; '•
agricultural runoff, and other pollution
sources; (b) contaminants formed during;
treatment of water-supplies (e-g.. • ;•
disinfection! by-products); and (c) :; •
.materials used for treatment, storage,
and distribution of water (e.g., direct
. and indirect additives). EPA^as Y..Y
considered all of these sources in! ;
selecting important,: or potentially,
important, drinking water contaminants
for the 1991.DWPL
EPA used the following general
criteria_f6r contaminant"selection for the
1988 DWPL, and has used the same.
criteria in revising the DWPL:
—Occurrence of the substance in public
water systems; or physical/chemical/
environmental characteristics and use
patterns of the substance indicate its
potential for occurrence in public
water systems at levels of concern. .
—Documented or suspected adverse
. health effects of the contaminant. -
—Availability of sufficient information
on the substance, including health
effects data, analytical methods, and
treatability studies, so that a
regulation could be developed within
the statutory time frame.
Alternatively, there should be
sufficient likelihood that needed
information on the contaminant can
be developed so that a regulation
could be developed before the
statutory deadline.
All contaminants on the 1991 DWPL
meet these selection criteria.
A. 1988 Drinking Water Priority List
The 1988 DWPL contained 53 ;
contaminants/contaminant groups (53
FR 1892, January 22,1988). It included
seven contaminants removed from the
statutory list of 83 contaminants, and
substances selected .from the following
groups: (1) Disinfectants and
disinfection by-products, (2) the first 50
contaminants on the SARA section 110
priority list, (3) design-analytes of the
EPA National Pesticides Survey, (4) .
unregulated volatile organic chemicals
(VOCs) listed under monitoring
requirements of section 1445 of the
SDWA, and (5) other substances
selected for specific reasons articulated
in the January 22,1988, Federal Register
notice.
EPA was required to propose
NPDWRs for at least 25 contaminants
on the DWPL by January 1990 and to
promulgate fee NPDWRa by January
1991. EPA has not met this schedule and
therefore is carrying forward to the 1991
list all the contaminants/contaminant
groups on the 1988 DWPL except as; ;
discussed below. Those contaminants
carried forward continue to meet DWPL
selection criteria. EPA plans to propose ;
NPDWRs for 25 contaminants in June
1993 that will be selected from the
revised(1991)DWPL. i,! k-; .
Three contaminants on the 1988: .;, ,. ?
DWPL—ammonia, silver, and sodium-
have been determined to be of low
priority for regulation and, therefore,'
have been dropped from the 1991 list. -
For each of these three substances, there
is either little or no potential for
exposure via drinking water, or no
adverse health effect associated with "
their presence in drinking -water. Current
data for ammonia indicate, no adverse
health effects on humans at levels found
in drinking water. Long-term exposure to
silver is known to cause argyria, a
grayish discoloration of the skin. Since
this is considered a cosmetic effect and
not a health effect, a secondary •
maximum contaminant level (SMCL)
was proposed for silver (54 FR 22062,
May 22,1989). SMCLs are not federally
enforceable and are established for
contaminants in drinking water which .
may affect the aesthetic qualities and
the public's acceptance of drinking
water. Sodium is low priority because .
drinking water contributes only a small
fraction of total dietary intake. In
addition association between sodium hi
drinking water and hypertension hi the
general population is based on
inadequate data (50 FR 46980, November
13,1985). Any of these three chemicals .
could be added to a subsequent DWPL
should new data warrant such action.
B. Lists of Substances Considered for
Revision of the Drinking Water Priority
List
The following sources were reviewed ;
by EPA to identify contaminants for the
1991 version of the DWPL. . .
1. SARA Priority List
The Superfund Amendments and
Reauthorization Act of 1988 (Pub. L. 99-
499 (SARA)) amended and extended
CERCLA of 1980 (42U.S.C. 9601 et seq.).
SARA (section 110) requires the Agency
for Toxic Substances and Disease
Registry (ATSDR) of the Department of -
Health and Human Services and EPA to
prepare a.priority-ordered list of • • .
hazardous substances covered by
CERCLA. The list must consist of those.
substances which are most commonly
• found at hazardous waste sites on the
.CERCLA National Priority List (NPL),
and which the agencies determine pose
the most significant potential threat to
human health. The first list of 100
substances was published in the Federal :
Register on April 17,1987 (52 FR 12866).,
The list was separated into four priority
groups of 25 substances each. The first
group of 25 is the highest priority group,
the second is the next highest priority,
and so on. The use of the SARA list in
the development of the DWPL fulfills the
SDWA requirement to consider.
CERCLA section 101(14) substances. •
This was discussed in detail, hi the 1988
DWPL Notice {53 ER1892, January 22.
1988). ,
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1472
Federal Register / Vol. 56. No. 9 / Monday. January 14. 1991 / Notices
EPA considered substances in priority ,
groups 1 and 2 of the first SARA list for
the 1888 DWPL. During revision of the
DWPL. EPA reexamined those
substances taking Into -consideration
new data which were generated since
1988. EPA also considered substances in'
priority groups 3 and 4. SARA priority
list substances which were selected for
the 1991 DWPL are listed in Table 1.
TABtE 1.— SARA SECTION 110 PRIORITY
LIST SUBSTANCES WHICH HAVE BEEN
* SELECTED FOR THE 1991 DWPL
AcrytooHrifr ~~
DtchlonxSfiuororrttthvM
2,4-DHtroptwnol
2,B-OWtfoto»u»o«
1,2-Ofcbwiylhydwzio*
Fiooretrichlororndtharw
Naphthalene is. the only substance
listed in Table 1 which was considered.
previously for the 1988 DWPL. ,
Naphthalene was excluded from the
1988 list because of little or no potential
for exposure through drinking water.
Revaluation of naphthalene has,
however, revealed a strong potential for
drinking water contamination. For
example, naphthalene may leach into
drinking water from coal tax based
protective coatings used in water
transmission lines and storage -tanks.
Also, a substantial increase in the
amount of naphthalene released to the
environment has been reported (U.S.
EPA, "Toxics Release Inventory,"
National Report, 1988), -suggesting the
possibility of drinking water • , •••
contamination. Therefore, naphthalene
has been Included in the 1991 DWPL.
Substances included in the second
SARA list (54 PR, October 20, 1988) and
the third SARA list (53 FR, October 26,
1980) will be considered for future
DWPLs.
2. Pesticides Registered Under FIFRA
Pesticides are logical candidates For
Inclusion on the DWPL. Since pesticides
are specifically developed for their
toxicity to -certain organisms, the
potential exists for their toxicity to
humans. Also, there is mounting
evidence that pesticide use -can. in some
circumstances, lead to contamination of
drinking water supplies. EPA used *wo
mechanisms to select pesticides for the
1091 version o£ the DWPL: - ,
a. Pesticides Selected Based on the •
Results of ths National Pesticides ••
Survey. The National Pesticides-Survey •
(NPS) wasa-joindysponsored project of
EPA's Office of Drinking Water (ODW)
and Office of Pesticide Programs (OPP).
It was the first national survey of
pesticides and pesticide' degradation
, products in drinking water wells. The
survey had two principal objectives: (1)
To determine the frequency and
concentration of pesticide.
contamination of drinking water wells
nationally: and (2) to improve EPA's
understanding of how contamination of
drinking water wells is associated with
patterns of pesticide use and the
vulnerability of ground water to
contamination. The survey involved
analysis of 127 pesticides and pesticide
degradation products in statistically
representative samples taken from more
than 1,300 wells, some, in every State.
The pesticides listed in Table Z have
been selected for the revised DWPL
because of their frequeqt reported
detection in drinking water wells.
Furthermore, these pesticides also- meet
the other DWPL criteria.
•TABLE 2.— PESTICIDES SELECTED
THE 1991 DWPL BASED ON THE RE-
SULTS OF THE NATIONAL PESTICIDES
SURVEY
Bentazon
DCPA (and its add metabolites) - . .
Parathion degradation .product <4-Nitrophenol)
Prometon ,
b.Pesticides Setected Based on Their
Leaching Potential. Ground-water
contamination by pesticides has been of '
considerable public concern over the
last several years, The Agency, through
its pesticide registration and ~
registration process, has -focused its
attention on identifying and developing
information on pesticides which have
. the greatest potential to leach into
ground water. A complex «etnf factors
influence the likelihood of pesticide
contamination of ground water in a
given location: The physical and
chemical'properties of the pesticide, : •
natural hydrogeologic and man-made
features at the site of application, and •
the .agronomic and pesticide application
practices employed. Pesticides that -
leach into ground water are .also
potential contaminants of surface •
waters. 'The NPDWRs apply to drinking
water -from -both sources.
As part of the registration/ •
reregistration process, EPA has required
ground-water -monitoring studies from • •
. the registrants on 36 pesticides. These
•pesticides are considered excellent .
candidates for the 1991 DWPL because
(1) they .have properties and .
•"characteristics associated with -other , , ; .
pesticides previously detected ingrourul
water, and (2) much of .the .information
on these pesticides which may be
needed for regulationiias already been
developed by the registrants. However,
many of the pesticides on the list of 36
have already been considered for
drinking water regulation via other
mechanisms. For example, they appear'
on the statutory list of 83 or on the 1988
DWPL or are analytes of the National
Pesticide Survey. For the revised DWPL.
EPA has selected from the 36 pesticides .
only those which meet the DWPL
criteria and are not already addressed .
elsewhere. These pesticides are listed in
Tables.
TABLE 3.— PESTICIDES SELECTED
THE 1991 DWPL BASED ON THEIR PO-
TENTIAL TO LEACH IN GROUND WATER
Asulam
Bromaca
Cyromazino
Fomesafen
Lactofen/AcHluorfen
Metalaxyt
Methomyl •
Thiodicarb • ' '
3. Substances Recommended by States
and EPA Regions
With the assistance of the Federal-
State Toxicology and Regulatory
Alliance Committee (FSTRAC), EPA
solicited recommendations from the ..
States and EPA regions for high-priority
drinking water contaminants which..
should be considered for inclusion in the
1991 DWPL. FSTRAC consists of .
representatives from State and Federal .
drinking water programs brought
together to exchange ideas and
information on the toxicology and risk
assessment of drinking water
contaminants. FSTRAC surveyed the
drinking waterprograms in all 50 States
and Puerto Rico for recommendations
regarding chemicals for future standards
development by EPA. FSTRAC
identified the chemicals most frequently
requested for regulation (i.e., requested
by four or more States). The. reasons for
requested standards development for .
these chemicals included their
widespread .use, documented or
suspected adverse.human health effects,.
and/or prevalence in .drinking water. •. ,
Many States and EPA regions also - - .
, submitted recommendations directly to
'. the .EPA. Based on 'the recommendations
.of .the States and EPA regions, the ...
chemicals listed in Table-4 have been
-selected for the 1991 DWPL: :
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•'. Federal Register '/ Vol. ~56, No. Si / Monday, January 14, 1991 / Notices
1473
TABLE 4.—SUBSTANCES SELECTED FOR
THE 1991 DWPL BASED ON THE REC-
OMMENDATION OF STATES AND EPA
REGIONS
Manganese " . "
Methyl ethyl ketone
Methyl (sobutyl ketone
Tetrahydrofuran
ID. 1991 Version of the Drinking Water
Priority List
Table 5 shows the final 1991 Drinking
Water Priority List of contaminants/
contaminant groups. The list is
comprised of 50 contaminants/
contaminant groups from the 1988 list
(which continue to meet the DWPL
criteria and have not been regulated
thus far) and 27 new substances
selected from the four groups discussed
in this notice. The total number of
contaminants/contaminant groups on
the revised list is 77.
TABLE 5.—PRIORITY LIST (1991 VERSION)
OF CONTAMINANTS WHICH MAY RE-
QUIRE REGULATION UNDER THE SAFE
DRINKING WATER ACT
TABLE 5.—PRIORITY LIST (1991 VERSION)
OF CONTAMINANTS (WHICH MAY RE-
QUIRE .REGULATION .UNDER THE SAFE
DRINKING WATER ACT—Continued
Substance
Inorganics (Total number =
14)
Aluminum
Boron................. ...........
Chloramines..H..«...H..«.»..........
Chlorate ........
Chlorine. ..................................
Chlorine dioxide ..
Chlorite ......
Cyanogen chloride
Hypochlorite ton..... .....
Manganese
Molybdenum.......... . .....
Strontium...™..................,,........
Vanadium ...»........»....„...«„„..•..
Zinc „.„....„.„„...•.„...._......„„
Pesticides (Total number =
19)
Asulam ........ — .._..
Bentazon
Bromacil ..«.«....«.«..»«.»»«.......
Cyanazine _..._ ......
Cyromazine...»..........................
DCPA (and its acid metabo-
lites).....-....
Dicamba...«..... H
Ethylenethiourea ._
Fomesafen
Lactofen/Aciiluorfen
Metalaxyl „ .
Methomyl
metolachlor..-..-...™.....-...
Metribuzln ........ „..„
Parathion degradation prod-
, uct (4-Nitrophenol) —
Prometon ..................... «
2,4,5-T ...................... '. ..
Thbdicarb .„ ...
Trifluralin . .......... .. „._. .
Synthetic Organic Ote/nfcals
(Total number -= 43)
' Acrylonitrile ™_ _..^..
: Bromobenzene..^«.«.-..u»».
CAS No.
7429905
7440428
».».........««....
14866683
7782505
10049044
14998277
506774
14380611
7439965
7439987
7440246
7440622
7440666
3337711
25057890
314409
21725462
66215278
1861321
1918009
96457
72178020
77501634/5094666
57837191
16752775
. 51218452
21807649
100027
1610180
93765
' 59669260
1582098
107131
i 108861
Substance
Bromochloroacetonitrila —...
Bromodtehloromethane —
Bromoform ,..._..... _.
Bromo methane
Chlorination/Chlorami nation
by-products (Misc.), e.g.,
Haloacetic acids, Haloke-
tones, Chloral hydrate,
MX-2 [3-chloro-4-(dichlor-.
omethyl)-5-hydroxy-2
(SHMuranonel, N-Organ-
ochloramines
Chlofoethane.H»...».H.» «....
Chloroform— _...:...„
Chloromethane ...—
Chloropicrin—„....._
o-Chlorotoluene.......................
p-CWorotoluene— .'..
DibromoacetonHrile
Dibromochloromethane
Dibromomethane ......
Dichloroacetonitrite
1,3-Dichlorobenzene .........
Dichlorodifluoro methane
1,1-Dichloroetnane
2,2-Dichloropropane.._....
1,3-Dichloropropane
1,1-Dichloropropene
1,3-Dichloropropene ........
2,4-Dinitrophenol
2,4-Dinitrotoluene
2,6-Dinitrototuene.....
. 1,2-Diphenylhydrazine
Fluorotrichloromethane
Hexachlorobutadiene...—.....
Hexachloroe thane
Isophorone
Methyl ethyl ketone
Methyl isobutyl ketone
MethyM-butyl ether
Naphthalene............................
Nitrobenzene...........................
Ozone by-products, e.g., Al-
dehydes, Epoxides, Per-
oxides, Nitrosamines, Bro-
mate, lodate
1,1,1,2-Tetrachloroethane
1,1 ^,2-Tetrachloroethane
Tetrahydrofuran« ...............
Trtohloroacetonitrile.......
1,2,3-Trichloropropane
Microorganisms (Total number
-1)
Cryptosporidum
CAS No.
83463621
75274
75252
74839
75003
67663
74873
76062
95498
106434
3252435
124481
74953
3018120
541731
75718
75343
594207
142289
563586
542756
51285
121142
606202
122667
75694
87683
67721
78591
78933
108101
1634044
91203
98953
630206
79345
109999
545062
96184
IV. Future Revisions of the Drinking
Water Priority List
In accordance with the requirements
of the SDWA, EPA will revise the DWPL
every three years. Revisions will drop
those contaminants for which
regulations have been promulgated, and
add new contaminants which may be of
concern. Revisions will also drop
contaminants which no longer meet
EPA's established criteria for
contaminant selection. EPA welcomes.
public comments or any suggestions for
future revisions of the list.
V. Other Requirements
A. Executive Order 12291
Under Executive Ordet 12291, EPA'
must judge whether a regulation is
"major" and therefore subject to the
requirements of a Regulatory Impact
Analysis. This notice is not a regulation
and will not have a financial or
economic impact on any party.
Therefore, EPA has not prepared an
Economic Impact Analysis (EIA). EPA
will prepare an EIA, if appropriate, at
the time of regulation of any
contaminant on the DWPL
B. Regulatory Flexibility Act
The Regulatory Flexibility Act (5
U.S.C. 601, et seq.) requires EPA to
explicitly consider the effect of proposed
regulations on small entities. This notice
does not constitute a proposed
rulemaking activity. Therefore, the
Regulatory Flexibility Act requires no
such analysis. As EPA prepares
regulations for contaminants selected
from the Drinking Water Priority List
under section 1412 of the SDWA, EPA
will consider the effect of the proposed
regulations on small entities.
C. Paperwork Reduction Act
There are no information collection
requirements in this notice (44 U.S.C.
3501 et seq.).
VI. References
References for the revised DWPL are
included in the public docket for this
notice. This docket is located at EPA
Headquarters, at the address listed at
the beginning of this notice. Individuals
, should contact the docket clerk (202-
382-3027) for access to the public
docket. Materials for the revised DWPL
are as follows:
FSTRAC, "States' Needs for Chemicals for
Regulation in Drinking Waters," Hutcheson
to Hais, April 27,1990.
State of California, "Chemicals for
Inclusion on the Candidate List for
Regulation Under the Safe Drinking Water
Act," Fan to Cantilli, May 2.1990.
State of Illinois, "List of Compounds Which
Have Been Detected in Public Water Supplies
and at Cleanup Sites," Virgin to Cantilli,
April 30,1990.
State of Maryland, "List of Drinking Water
Contaminants Which Have Occurred in
Private or Public Water Systems in
Maryland," Paull to Saxena, April 19,1990.
State of Rhode Island, "Candidate
Substances for Safe Drinking Water Act List
of Priority Drinking Water Contaminants,"
Lee to Cantilli, May 10,1990..
State of Wisconsin, "Substances for
Inclusion on the Drinking Water Priority.
List," Swailes to Saxena. April 16,1990.
. U.S. EPA, "National Primary Drinking
Water Regulations: Synthetic Organic
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1474
Federal Register / VoL 58, No. 9 / Monday. January 14, 1991 / Notices
Chemicals, Inorganic Chemicals and
Microorganisms: Proposed Rule" (50 FR
^0030. November 13.1805).
VS. EPA. "Notice of the First Priority List
of Hazardous Substances that Will Be the
Subject of Toxicological Profiles and
Guideline! for Development of Toxicological
Profile*," {SZ FR 12868. April 17.1967].
US.EPA, "List of National Pesticide
Survey Anslytci" and "Preliminary Survey
Results," National Pesticide Survey File 1987-
leoo.
VS. EPA, "Drinking Water Substitution of
.Contaminants and Drinking Water Priority
List of Additional Substances .Which May
Require Regulation Under the Safe Drinking
Water Act" (53 FR 1892, January 22,1988),
. U:S. EP£ "Hazardous Substances Priority
• List/Toxicolqgical Profiles; Second List {53
FR 41280. October 20,1988).
U.S. EPA, Toxies-Release.Inventory
(TRI)." National Report 1988. Draft.
• U.S. EPA. "National Primary and
Secondary Drinking Water Regulation;
Proposed Rule" (54 FR 22062, May 22,1969).
U.S. EPA, "The Third List of Hazardous
Substances That-Will Be the Subject of
Toxicological Profiles {54 FR 43815. October
26,1989).
US. EPA. Region t "Drinking Water
Priority List (DWPL) for 1991-^-tisling of '
Candidates for Regulation." Chow to CantilH.
May 15,1990.
Dated: December 31,1990.
F. Henry Habicht,
Acting Administrator.
[FR Doc. 91-808 Filed 1-11-918:45 am]
BILLING CODE (580-SO-U
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