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更新日期：2019-08-02
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A beautiful quiz app to help you prepare for Water Operator Certification Exam. Simple and intuitive user interface. Quick and portable, on the go studying. No need for those heavy books or bulky note cards. No internet connection required.
World Health Organization (WHO) guidelines are a general set of standards intended to apply where better local standards are not implemented. More rigorous standards apply across Europe, the USA and in most other developed countries. followed throughout the world for drinking water quality requirements.
The Safe Drinking Water Act requires the U.S. Environmental Protection Agency (EPA) to set standards for drinking water quality in public water systems (entities that provide water for human consumption to at least 25 people for at least 60 days a year). Enforcement of the standards is mostly carried out by state health agencies. States may set standards that are more stringent than the federal standards.
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