The MCL is the maximum permissible level of a contaminant in water which is delivered to any user of a public water system. U.S. EPA National Primary Drinking Water Regulations National Primary Drinking Water Regulations are enforceable drinking water standards expressed as Maximum Contaminant Levels (MCLs) or treatment technique requirements. WQC - EPA National Recommended WQ Criteria, EPA-822-R-02-047, November 2002 LOELs - Lowest Observed Effects Levels, EPA WQ Criteria Documents (circa 1980s) DWMCL -EPA Drinking Water MCLs/Other Standard, EPA 822-R-02-038, Summer 2002 NHSWS - NH Surface Water Quality Standards, Env.-Ws 1703.21, 12/03/99 4.2 Nickel is considered to be relatively nontoxic to man and a limit for nickel is not included in the EPA National Interim Primary Drinking Water Regulations. EPA Identifier Effective Date End Date; Total metals -- CWA 304B Total metals -- CWA 304B: E755314: 06/02/2000: Metals Metals: E17001751: Nickel sulfate, mixt. In Canada, the median nickel level in drinking-water supplies was below the detection limit of 2 µg/litre; the maximum level observed was 69 µg/litre (Méranger et al., 1981). with copper Nickel sulfate, mixt. The first draft of Nickel in Drinking-water, Background document for development of WHO Guidelines for Drinking-water Quality, was prepared by Mr J.K. Fawell, United Kingdom, to whom special thanks are due. Concentration levels higher than the promulgated levels by the EPA must be addressed right away to prevent threats to public health. 6 The toxicity of nickel to aquatic life indicates tolerances that vary widely and that are influenced by species, pH, synergistic effects, and other factors. 19 Nickel 20 g/l Nickel is a metal used in the production of stainless steels and alloys and thus may be present in drinking water from water that comes into contact with nickel or chromium plated taps particularly where the water has been stagnant prior to consumption. The atomic absorption spectrometric methods (Sections 3111 B and C), the inductively coupled plasma methods (Sections 3120 and 3125), and the electrothermal atomic absorption spectrometric method (Section 3113 B) are the methods of choice for all samples. What is the EPA’s Standards for Nickel in Drinking Water The Environmental Protection Agency has declared an MCL and MCLG of 0.1 mg/L for the contaminant nickel. In drinking-water in the USA, 90% of all samples (n = 2503) contained ≤10 µg/litre, and 97% had nickel … The U.S. EPA primary drinking water standard MCL is 0.1 mg/L. ----- AMBIENT WATER QUALITY CRITERIA FOR NICKEL Prepared By U.S. ENVIRONMENTAL PROTECTION AGENCY Office of Water Regulations and Standards Criteria and Standards Division Washington, D.C. Office of Research and Development Environmental Criteria and Assessment Office Cincinnati, Ohio Carcinogen Assessment Group Washington, D.C. Environmental Research Laboratories Corvalis, … with copper: E17160672 Environmental Protection Agency (EPA) the authority to establish acceptable or "safe" levels for known or suspected drinking water contaminants and to design a national drinking water protection program. From NSF/ANSI Standard 53: Drinking Water Treatment Units - Health Effects Overview: Standard 53 addresses point-of-use (POU) and point-of-entry (POE) systems designed to reduce specific health-related contaminants, such as Cryptosporidium, Giardia, lead, volatile organic chemicals (VOCs), MTBE (methyl tertiary-butyl ether), that may be present in public or private drinking water. Between 1974 and 1986, the EPA had developed standards for 22 contaminants and the SDWA

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