United States
Environmental Protection
Agency
Office of Water
WH550
May 1991
s>EPA National Primary Drinking
Water Regulations


F-A-C-T-S-H-E-
E  T


Proposed
Regulations
No.
Final of
Regulations Contaminants
Cumulative
No. of
Contaminants
Pre-1986

National Interim Primary
Drinking Regulations
23
23
1986

Fluoride (revised)
4/86
1
23
1987

Phase 1 (VOCs)
7/87
8
31
1989
Phase II
(38 contaminants)
Total Coliforms (revised)
6/89
1
31


Surface Water Treatment
(1 revision & 4 new regs)
6/89
5
35
1990
1991
Phase V
(24 contaminants)
Phase III
(6 contaminants)
Phase II (33 SOCs & lOCs:
tO revisions & 23 new regs;
1 deletion^ 2/90
Lead (revised) & Copper (new)
4/91
33
2
57
58


Phase II (5 SOCs & lOCs:
1 revision & 4 new regs)
7/91
5
62
1992

Phase V (24 SOCs & lOCs:
1 revision & 23 new regs)
2/92
24
85
1993
Arsenic*
Phase VIA
(10 contaminants)
Phase VIB
(15 contaminants)
G.W. Disinfection
Phase III (Radionuclides:
4 revisions A 2 new regs)
5/93
6
87
199S

Arsenic (revised)*
1/95
1
87


Phase VIA (Disinfection
By-Products: 1 revision &
apgox. 9 new regs)
10
96


Phase VIB (appcox. 15
new SOCs & lOCs)
6/95
15
111


G.W. Disinfection
6/95
0
111
'May be delayed if additional research needed.

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Pre-1986 (Interim)
1990
inorganics
Arsenic
Barium
Cadmium
Chromium
Fluoride
Lead
Mercury
Nitrate
Selenium
Silver
Organics
2,4-0
Endrin
Lindane
Methoxychlor
Toxaphene
2,4,5-TP (Silvex)
Total Trihalomethanes (Chloroform,
Bromoform, Bromodichloromethane,
Dibromochloromethane)
Radionuclides
Gross alpha particle activity
Gross beta particle activity
2a5um 2 "] total
Radium 228 I
Microbial
Conforms (total)
Other
Turbidity
198	6	
Fluoride (revised)
198	7	
Phase I
Benzene
Carbon Tetrachloride
p-Dichlorobenzene
1,2-Dichloroethane
1,1-Dichloroethylene
1,1,1-Trichloroethane
Trichloroethylene
Vinyl Chloride
1989	
Total Conforms
Total Conforms (revised)
Surface Water Treatment
Turbidity (revised)
Giardia Lamblia
Heterotrophic Plate Count (HPC)
Legionella
Virus
Phase II
Inorganics
Asbestos
Barium (revised)
Cadmium (revised)
Chromium (revised)
Mercury (revised)
Nitrate (revised)
Nitnte
Selenium (revised)
Silver (deleted)
VOCs
o-Dichlorobenzene
cis-1,2-Dichloroethylene
trans-1,2-Dichloroethylene
1,2-Dichloropropane
Ethylbenzene
Monochlorobenzene
Styrene
Tetrachloroethylene
Toluene
Xylenes (total)
Pesticides/PCBs
Alachlor
Atrazine
Carbofuran
Chlordane
Dibromochloropropane
Ethylene Dibromiae
Toxaphene (revised)
Heptachlor
Heptachlor Epoxide
Lindane (revised)
Methoxychlor (revised)
PCBs
2,4-D (revised)
2,4,5-TP (Silvex) (revised)
Water Treatment Chemicals
Acrylamide
Epichlorahydrin
1991	
April
Lead (revised)
Copper
June
Phase U
Barium (revised)
AkJicart) Sulfone
Pentachlorophenol
Aldicarb
Akjicarb Sulfoxide
Continued on next page

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1992
1995 (continued)
February
Phase V
Inorganics
Antimony
Beryllium
Cyanide
Nickel
Sulfate
Thallium
Organics
Dalapon
Di(ethylhexyl) Adipate
Di(ethylhexyl) Phthalate
Dichloromethane
Oinoseb
Diquat
Endothall
Endrin (revised)
Glyphosate
Hexachlorobenzene
Hexachlorocyclopentadiene
Oxamyl (vydate)
PAHs
Picloram
Simazine
1,2,4-Trichlorobenzene
1,1,2-Trichloroethane
2,3,7,8-TCDD (Dioxin)
1993	
May
Radionuclides
Beta particle and photon radioactivity (revised)
Gross alpha particle activity (revised)
Radium 226 (revised)
Radium 228 (revised)
Radon
Uranium
1995	
January
Arsenic (revised)
Juno
Phase VIA
Disinfectants and Disinfection
By-Products (approximately 10
contaminants will be! regulated)
Chlorine
Chloramine
Chlorine Dioxide
Cyanogen Chloride
Bromate
lodate
Chlorite
Chlorate
Trihalomethanes (revised)
Chloroform (revised)
Bromodichloromethane (revised)
Dibromochloromethane (revised)
Bromoform (revised)
Haloacetic Adds
Dichloro.acetic Acid
Trichloroacetic Acid
Chloropicrin
Chloral Hydrate
Aldehydes
Phase VIB
(approximately 15 contaminants
will be regulated)
Aluminum
Acrylonitrile
Bentazon
Boron
Bromacil
Bromomethane
Cyanazine
Dacthal (DCPA)
Dicamba
1,1-Dichloroethane
cis/trans-1,3-dichloropropene(Telone)
2,4/2,6-Dinitrotoluene
Ethylene Thiourea (ETU)
Hexachlorobutadiene
Isophorone
Lactofen/Acifluorfen
Manganese
Methomyl
Methyl Ethyl Ketone (MEK)
Methyl Isobutyi Ketone (MIBK)
Methyl Tertiaiy Butyl Ether (MTBE)
Metoiachlor
Metribuzin
Molybdenum
Naphthalene
4-Nitrophenol
Prometon
1,1,1,2-Tetrachloroethane
1,1 ^,2-Tetrachloroethane
1,2,3-Trichloropropane
Trifluralin
Vanadium
Zinc
Continued on next page

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Notes:
Statutory Deadlines for NPDWRs
Initial List of 83 Contaminants*
9 by 6/19/87
40 by 6/19/88
34 by 6/19/89
25 Additional Contaminants Every 3 Years
25 by 1/1/91
25 by 1/1/94
'initial list of 83 contaminants will result in 85 separate
NPDWRs. Radium 226 and Radium 228 are listed as
a single contaminant; Dichlorobenzene is also listed
as a single contaminant Separate NPDWRs are
being developed for Radium 226, Radium 228, p-
Dichforobenzene and o-Dichlorobenzene. There also
will be 2 additional NPDWRs which are not on the ini-
tial list of 83: Total Trihalomethanes (interim) and
Hexachlorobenzene (Phase V). This brings the total to
87 prior to the first group of additional 25 con-
taminants.

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