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  1. The estimated daily ammonia intake through food and drinking-water is 18 mg, by inhalation less than 1 mg, and through cigarette smoking (20 cigarettes per day) also less than 1 mg. In

  2. *Maximum Contaminant Level (MCL) - The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to MCLGs as feasible using the best available treatment technology and taking cost into consideration.

  3. The MCL values for specific drinking water contaminants must be used for regulated contaminants in public drinking water systems. The DWSHA tables are revised periodically by the OW so that the benchmark values are consistent with the most current Agency assessments.

  4. The following tables include California’s maximum contaminant levels (MCLs), detection limits for purposes of reporting (DLRs), public health goals (PHGs) from the Office of Environmental Health Hazard Assessment (OEHHA).

  5. The EPA has established a maximum contaminant level (MCL) for ammonia in drinking water of 0.5 mg/L [2]. This level is based on the potential health effects of long-term exposure to high levels of ammonia and is considered to be protective of human health.

  6. Maximum contaminant levels (MCLs) are standards that are set by the United States Environmental Protection Agency (EPA) for drinking water quality. [1][2] An MCL is the legal threshold limit on the amount of a substance that is allowed in public water systems under the Safe Drinking Water Act (SDWA).

  7. Ammonia in drinking-water is not of immediate health relevance, and therefore no health-based guideline value is proposed. However, ammonia can compromise disinfection eficiency, result in nitrite formation in distribution systems, cause the failure of filters for the removal of manganese and cause taste and odour problems (see also chapter 10).

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