答：黑臭水体判定：一是感官判定。水体异味（发臭、发酸）或颜色明显异常（发黑、发黄、发白）等感官特征进行识别，出现任意一种情况，即视为黑臭水体。

二是公众评议判定。对感官判断有争议的农村水体，有关部门可委托专业机构对水体周边居住村民、商户或随机人群开展调查问卷。调查问卷数量不少于30份，认为“黑”或“臭”问题的人数占被调查人数的60%以上，即视为黑臭水体。三是水质监测判定。难以开展公众调查评议时，通过水质监测判定。水质监测指标包括透明度（≥25cm）、溶解氧（≥2mg/L）、氨氮（≤15mg/L）3项指标，任意一项不达标即判定为黑臭水体。

　　黑臭水体认定标准，法律分析：黑臭水体，目前的主流定义是以溶解氧、臭阈值、透明度和色度四个指标进行水体质量考量，其中有一项不达标就可称为黑臭水体。

　　法律依据：《中华人民共和国水污染防治法》 第二十九条 国务院环境保护主管部门和省、自治区、直辖市人民政府环境保护主管部门应当会同同级有关部门根据流域生态环境功能需要，明确流域生态环境保护要求，组织开展流域环境资源承载能力监测、评价，实施流域环境资源承载能力预警。县级以上地方人民政府应当根据流域生态环境功能需要，组织开展江河、湖泊、湿地保护与修复，因地制宜建设人工湿地、水源涵养林、沿河沿湖植被缓冲带和隔离带等生态环境治理与保护工程，整治黑臭水体，提高流域环境资源承载能力。从事开发建设活动，应当采取有效措施，维护流域生态环境功能，严守生态保护红线。

以上黑臭水体判定方法分别来源于芜湖市政府问答与百度知乎问答！

福建生态环境厅：什么是农村黑臭水体？

　　农村黑臭水体是各县(市、区)建制镇(乡、街道等)的行政村范围内颜色明显异常或散发浓烈(难闻)气味的水体。农村黑臭水体水质具体判定标准及监测方法如下：

　　注：1.*水深不足25cm时，透明度指标阈值按水深的40%取值;

　　2.特征指标任意一项不达标即为黑臭水体。

上海瑞柘环保承接各种河道、湖泊黑臭水体生态修复工程！

　　Answer: black and smelly water body judgment: first, sensory judgment. The odor (smelly, sour) or obvious abnormal color (black, yellow, white) and other sensory characteristics of the water body are identified. In any case, it is regarded as a black and smelly water body.

　　Second, public evaluation and judgment. For rural water bodies with controversial sensory judgments, relevant departments can entrust professional institutions to carry out questionnaires on villagers, merchants or random people living around the water bodies. The number of questionnaires is not less than 30, and the number of people who think that "black" or "smelly" problems account for more than 60% of the respondents, that is, they are regarded as black and smelly water bodies. Third, water quality monitoring and judgment. When it is difficult to carry out public investigation and evaluation, it shall be judged through water quality monitoring. Water quality monitoring indicators include transparency (≥ 25cm), dissolved oxygen (≥ 2mg/l) and ammonia nitrogen (≤ 15mg/l). If any of them fails to meet the standard, it will be judged as a black and odorous water body.

　　Determination of black and odorous water body

　　Legal Analysis on the identification standard of black and odorous water body: the current mainstream definition of black and odorous water body is to consider the quality of water body based on four indicators: dissolved oxygen, odor threshold, transparency and chromaticity. If one of them fails to meet the standard, it can be called black and odorous water body.

　　Legal basis: Article 29 of the law of the people's Republic of China on the prevention and control of water pollution, the competent department of environmental protection under the State Council and the competent department of environmental protection under the people's Government of provinces, autonomous regions and municipalities directly under the central government shall, together with the relevant departments at the same level, clarify the requirements for the protection of the ecological environment of river basins, organize the monitoring and evaluation of the carrying capacity of environmental resources of river basins, and implement the early warning of the carrying capacity of environmental resources of river basins. Local people's governments at or above the county level shall, according to the needs of the ecological environment functions of river basins, organize the protection and restoration of rivers, lakes and wetlands, build ecological environment treatment and protection projects such as artificial wetlands, water conservation forests, vegetation buffer zones and isolation zones along rivers and lakes according to local conditions, rectify black and smelly water bodies, and improve the carrying capacity of environmental resources of river basins. In carrying out development and construction activities, effective measures shall be taken to maintain the ecological environment functions of the river basin and strictly observe the red line of ecological protection.

　　The above methods for judging black and smelly water bodies come from Wuhu Municipal Government Q & A and Baidu Zhihu Q & A respectively!

　　Shanghai Ruizhe environmental protection undertakes various ecological restoration projects of black and smelly water bodies in rivers and lakes!