在世界各地，在许多发达国家和其他发展中国家，已经建立了THM存在的基本标准，然而，不幸的是，在饮用水饮用水(右等，2014)中，没有任何允许的限制。最近，为了记录不同种类的哈斯在饮用水中的存在和发生，已经做出了一些努力，这在DBPs和THMs之后就构成了相当大的数量。关于突然越来越感兴趣的原因对哈斯的影响和存在的饮用水来自这样一个事实:不同的毒理学研究证实长期接触哈斯从饮用水导致癌症实验室动物暴露在相同的实验条件下(Procházka et al .,2015)。此外，最近发表的流行病学数据(Smith et al .，2016)已经表明，在长期暴露于饮用水中，哈斯在饮用水中的水平提高了人类癌症的风险。因此，很明显，哈斯在饮用水中的存在与癌症的风险和步骤是直接相关的，以便在饮用水中建立可允许的哈斯水平。这种过度的存在不仅对人类造成严重的健康威胁，而且对自然界存在的所有其他生命形式也构成严重威胁。
Across the world, in many developed countries along with other developing countries, the basic standard of presence of THM has been established, however, unfortunately, there is no permissible limit given out for HAAs in potable drinking water (Righi et al., 2014). Quite recently, a number of efforts have been made in order to document the presence and occurrence of different classes of HAAs in potable drinking water, which constitute a significant amount just after the DBPs and THMs respectively. The reasons regarding the sudden growing interest towards the impact and presence of HAAs in drinking water come from the fact that the different toxicological studies have established that prolonged exposure to HAAs from drinking water results in cancer when laboratory animals were exposed to the same under experimental conditions (Procházka et al., 2015). Additionally, a recent epidemiological data published (Smith et al., 2016) have shown that the levels of HAAs in drinking water has enhanced the risks of cancer in human beings upon long term exposure. Thus, it is clear that the presence of HAAs in drinking water is directly associated with cancer risks and steps are needed in order to establish the permissible levels of HAAs in drinking water. The excessive presence of the same poses serious health threats not only for human beings but also all other forms of life existing in nature.