Six-Year Review 1 of Drinking Water Standards
In July 2003, EPA announced the review results for the first Six-Year Review (called the Six-Year Review 1). EPA reviewed 69 national primary drinking water regulations (NPDWRs) that were established prior to 1997. These 69 NPDWRs include 68 chemical NPDWRs and the Total Coliform Rule (TCR). Based on the Agency's review, as well as the public comments received and other new information, EPA found that it was appropriate to revise the Total Coliform Rule (TCR). EPA found that it was not appropriate to revise the 68 chemical NPDWRs at that time.
On this page:
Summary of Six-Year Review 1 Results
Learn more about the drinking water contaminants listed below
Summary of Review Outcomes |
Regulated Contaminants |
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Not Appropriate for Revision at this Time |
Risk assessment in process1:
chemical currently undergoing an EPA health risk assessment;
includes the three initiated as a result of this review
(34 NPDWRs)
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Acrylamide
Alachlor
Antimony
Asbestos
Atrazine
Benzo[a]pyrene
Cadmium
Carbofuran
Carbon tetrachloride
Copper
Cyanide
2,4-D (2,4-Dichlorophenoxyacetic acid)
1,2-Dichlorobenzene
1,4-Dichlorobenzene
1,2-Dichloroethane
Di(2-ethylhexyl)adipate
Di(2-ethylhexyl)phthalate
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Diquat
Endothall
Ethylbenzene
Ethylene dibromide
Glyphosate
Methoxychlor
Pentachlorophenol
Polychlorinated biphenyls
Simazine
Styrene
2,3,7,8-TCDD (Dioxin)
Tetrachloroethylene
Toluene
1,1,1-Trichloroethane
Trichloroethylene
Xylenes
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NPDWR remains appropriate after data/information review(16 NPDWRs) |
Barium
Dalapon
cis-1,2-Dichloroethylene
trans-1,2-Dichloroethylene
Dinoseb
Endrin
Epichlorohydrin
Hexachlorocyclopentadiene
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Mercury
Monochlorobenzene
Nitrate
Nitrite
Selenium
2,4,5-TP (Silvex)
1,2,4-Trichlorobenzene
Vinyl chloride
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New information, but no revision recommended because: |
Low priority |
Benzene
Beryllium
Chlordane
1,2-Dibromo-3-chloropropane
1,1-Dichloroethylene
1,2-Dichloropropane
Heptachlor
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Heptachlor epoxide
Hexachlorobenzene
Lindane
Oxamyl
Picloram
Toxaphene
1,1,2-Trichloroethane
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Information gaps |
Chromium
Dichloromethane |
Fluoride
Lead
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Candidate for Revision |
Based on review of "other regulatory provisions" (1 NPDWR) |
Total Coliform Rule (TCR) |
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1. As of December 31, 2002, EPA was conducting or had scheduled a detailed review of health effects information. |
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Federal Register Notices and Fact Sheet
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Federal Register Notice - Final Completion
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National Primary Drinking Water Regulations; Announcement of Completion of EPA's Review of Existing Drinking Water Standards July 18, 2003: (Volume 68, Number 138)
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Federal Register Notice - Proposed Results and Comment Period
- National Primary Drinking Water Regulations; Announcement of the Results of EPA's Review of Existing Drinking Water Standards and Request for Public Comment April 17, 2002: (Volume 67, Number 74)
- Fact Sheet: Six-Year Review 1