The annual water quality reports that utilities are required to send customers provide a partial picture, the study says, as they contain no information on unregulated chemicals.

这项研究表示，自来水公司会按要求每年向客户提供年度水质报告，包括部分照片，但他们没有提供关于法律限定之外化学物质的任何信息。

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This study is part of efforts by the U.S. Geological Survey's National Water-Quality Assessment Program to monitor the quality of the nation's groundwater and surface water.

这项科学研究是美国地质调查局国家水质评估项目的一部分，旨在对美国地下和地表水质进行检测。

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A three-year study of the nation's drinking water quality has found more than 200 unregulated chemicals in the tap water of 45 states.

美国一项长达三年的全国饮用水调查研究发现，有45个州的自来水中含有202种没有设定法律限定标准的化学物质。

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The study said improving water quality was key to controlling starfish outbreaks, with increased agricultural run-off such as fertiliser along the reef coast causing algal blooms that starfish larvae feed on.

BBC: Half of Great Barrier Reef coral lost in last 27 years

The Research Council study was not tasked with assessing water quality surrounding hydraulic fracturing.

CNN: Debate over fracking, quakes gets louder

The main beach in Weston-super-Mare received a pass in the MCS Good Beach Guide study, which focuses entirely on water quality standards and the risk of sewage pollution.

BBC: Weston Uphill Slipway beach fails water quality standard