Six-Year Review 2 of Drinking Water Standards
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acrylamide,
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epichlorohydrin,
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tetrachloroethylene and
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trichloroethylene.
In addition to the 71 NPDWRs reviewed in detail for the Six-Year Review 2, fourteen other NPDWRs were included in the review but did not need a detailed review because of recent or ongoing regulatory actions (i.e., disinfection byproducts (DBPs), lead and copper, and microbials).
On this page:
Summary of Six-Year Review 2 Results
Learn more about the drinking water contaminants listed below
| Summary of Review Outcomes | Regulated Contaminants | |||
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1. For these compounds, there is no potential to change the maximum contaminant levelThe highest level of a contaminant that is allowed in drinking water as delineated by the National Primary Drinking Water Regulations. These levels are based on consideration of health risks, technical feasibility of treatment, and cost-benefit analysis. (MCL) based on changes in analytical feasibility or there may be a potential change to the MCL based on analytical feasibility but any such change is unlikely to provide a meaningful opportunity to improve public health protection. Therefore, EPA chose to leave these in the ongoing health assessment category. 2. Note that a health assessment is in process but new analytical feasibility and treatment technology information may justify a revision. |
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| No Detailed Technical Review Conducted During this Cycle Due to Recent or Ongoing Regulatory Action (14 NPDWRs) | Bromate Chloramines Chlorine Chlorine dioxide Chlorite Coliform Copper |
Cryptosporidium Giardia lamblia Haloacetic acids Lead Legionella Total Trihalomethanes Viruses |
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| Not Appropriate for Revision at this Time | Health effects assessment in process or potential nominee for an assessment (32 NPDWRs) | Alpha particles (or emitters)1 Antimony Arsenic Asbestos Benzo(a)pyrene1 Beryllium Beta particles and photon emitters1 Cadmium Carbon tetrachloride1 Chromium Cyanide 1,2-Dichlorobenzene 1,4-Dichlorobenzene 1,2-Dichloroethane1 cis-1,2-Dichloroethylene trans-1,2-Dichloroethylene |
Dichloromethane1 Di(2-ethylhexyl)adipate1 Di(2-ethylhexyl)phthalate1 Ethylbenzene Fluoride Nitrate Nitrite Pentachlorophenol1 Polychlorinated biphenyls (PCBs)1 Radiums1 Selenium Styrene 2,3,7,8-TCDD (dioxin)1 Thallium 1,2,4-Trichlorobenzene Uranium |
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| NPDWR remains appropriate after data/information review(8 NPDWRs) | Dalapon Dinoseb Endrin Ethylene Dibromide (EDB) Mercury (inorganic) |
Methoxychlor Monochlorobenzene (chlorobenzene) 2,4,5-Trichorophenoxy-propionic acid (2,4,5-TP) |
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| New information, but no revision recommended because: | Low priority (24 NPDWRs) |
Alachlor Barium Benzene Chlordane 1,2-Dibromo-3-chloropropane (DBCP) 1,1-Dichloroethylene 1,2-Dichloropropane 2,4-Dichlorophenoxyacetic acid (2,4-D) Diquat Endothall Glyphosate |
Heptachlor Heptachlor epoxide Hexachlorobenzene Hexachlorocyclopentadiene Lindane Oxamyl Picloram Toluene Toxaphene 1,1,1-Trichloroethane 1,1,2-Trichloroethane Xylenes Vinyl chloride |
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Emerging information or data gaps |
Atrazine Carbofuran |
Simazine | ||
| Candidate for Revision | Based on new information (4 NPDWRs) | Acrylamide2 Epichlorohydrin |
Tetrachloroethylene (PCE)2 Trichloroethylene (TCE)2 |
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Federal Register Notices and Fact Sheet
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Federal Register Notice
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Federal Register Notice (Extension of Comment Period)
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Fact Sheet: Six-Year Review 2