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Basic Information about Drinking Water Contaminants

Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water poses a health risk.  EPA sets standards for approximately 90 contaminants in drinking water.

This list of contaminants includes those regulated under the Chemical Phase Rules. We will continue to update this page with new fact sheets for microorganisms, disinfectants , disinfection byproducts, copper, acrylamide and epichlorohydrin. The fact sheets posted on this page update fact sheets published previously, and add new ones. For historical purposes, the original versions are available in PDF on this page: "Drinking Water Contaminants" http://www.epa.gov/safewater/hfacts.html.

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z


A
Alachlor
Alpha Photon Emitters (Radionuclide)
Antimony
Arsenic
Asbestos
Atrazine


B
Barium
Benzene
Benzo(a)pyrene
Beryllium
Beta Photon Emitters (Radionuclide)

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C
Cadmium
Carbofuran
Carbon Tetrachloride
Chlordane
Chlorobenzene
Chromium
Cyanide


D
2,4-Dichlorophenoxyacetic Acid
Dalapon
1,2-Dibromo-3-chloropropane (DBCP)
o-dichlorobenzene
p-Dichlorobenzene
1,2-Dichloroethane
1,1-Dichloroethylene
cis-1,2-Dichloroethylene
trans-1,2-Dichloroethylene
Dichloromethane
1,2-Dichloropropane
Di(2-ethylhexyl) adipate
Di(2-ethylhexyl) phthalate
Dinoseb
Dioxin (2,3,7,8-TCDD)
Diquat

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E
Endothall
Endrin
Ethylbenzene
Ethylene dibromide


F
Fluoride


G
Glyphosate


H
Heptachlor
Heptachlor Epoxide
Hexachlorobenzene
Hexachlorocyclopentadiene

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I


J


K


L
Lead
Lindane


M
Mercury
Methoxychlor


N
Nickel (remanded 1995)
Nitrate
Nitrite

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O
Oxymal


P
Pentachlorophenol
Picloram
Polychlorinated biphenyls (PCBs)


Q


R
Radium 226 and Radium 228 (Radionuclide)

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S
Selenium
Simazine
Styrene


T
Tetrachloroethylene
Thallium
Toluene
Toxaphene
2,4,5-TP Silvex
1,2,4-Trichlorobenzene
1,1,1-Trichloroethane
1,1,2-Trichloroethane
Trichloroethylene


U
Uranium (Radionuclide)


V
Vinyl Chloride

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W


X
Xylenes


Y


Z

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