Secure potable water is indispensable to life. The presence of salinity in potable water has become a serious problem worldwide and it is essential to ensure secure potable water, particularly in the coastal areas of Bangladesh. In this work, 48 (forty-eight) harvested rainwater samples were assessed from Upazila (sub-district) of Mongla and Sarankhola, Bagerhat district, Bangladesh during the monsoon (May) and post-monsoon (October) periods. The objective was to examine the effect of seasonal variations on the quality of harvested rainwater. The harvested rainwater was analyzed for fecal coliform, total coliform, lead (Pb), zinc (Zn), pH, and turbidity. The mean pH in monsoon and post-monsoon periods was 6.93 and 7.24, respectively, which was within both the WHO guideline and Bangladesh Drinking Standard. In the monsoon season, turbidity levels in samples met the Bangladesh water quality standard but 10% of the harvested rainfall samples had Pb levels that exceeded the WHO drinking water limit. The turbidity of harvested rainwater in post-monsoon exceeded the WHO and Bangladesh Drinking Standard by 21% (10 out of 48) and 6% (3 out of 48), respectively. The fecal coliform of harvested rainwater exceeded both WHO and Bangladesh Drinking Standard by 56% (27 out of 48) and 67% (32 out of 48) in the monsoon and post-monsoon, correspondingly. Conversely, total coliform of harvested rainwater exceeded both the WHO and Bangladesh Drinking Standard by 67% (32 out of 48) and 79% (38 out of 48), accordingly in the monsoon and post-monsoon seasons. The Zn was below the WHO and Bangladesh Drinking Standard but Pb exceeded the WHO guideline in the monsoon and post-monsoon by 15% (7 out of 48) and 17% (8 out of 48), respectively. Pb is toxic to humans and children are especially vulnerable. The harvested rainwater should be treated effectively to reduce the toxicity and danger posed by Pb, fecal coliform, and total coliform before it is fit for drinking purposes.

安全的饮用水是生活中必不可少的。饮用水中盐分的存在已成为世界范围内的严重问题，确保饮用水安全至关重要，特别是在孟加拉国沿海地区。在这项工作中，在季风（5月）和季风后（10月）期间，从孟加拉国孟加拉国Bagerhat区的Mongla和Sarankhola的Upazila（分区）评估了48个（48个）雨水收集样品。目的是研究季节性变化对收集的雨水水质的影响。分析收集的雨水的粪便大肠菌，总大肠菌，铅（Pb），锌（Zn），pH和浊度。季风和季风后时期的平均pH值分别为6.93和7.24，均在WHO准则和孟加拉国饮水标准之内。在季风季节，样品中的浊度水平达到孟加拉国的水质标准，但收获的降雨样品中有10％的铅水平超过了WHO的饮用水限量。季风后收集的雨水的浊度分别超过了WHO和孟加拉国饮水标准的21％（48个中的10个）和6％（48个中的3个）。季风和季风后，收集到的雨水的粪便大肠菌群分别超过了WHO和孟加拉国饮水标准的56％（占48个中的27个）和67％（占48个中的32个）。相反，在季风季节和季风后季节，雨水的总大肠菌群超过世界卫生组织和孟加拉国饮水标准的比例分别为67％（48个中的32个）和79％（48个中的38个）。锌在季风和季风后低于世界卫生组织和孟加拉国饮水标准，但铅分别超出世卫组织准则15％（占48个中的7个）和17％（占48个中的8个）。铅对人类有毒，儿童尤其容易受到伤害。收集的雨水在适合饮用之前，应进行有效处理，以减少铅，粪大肠菌群和总大肠菌群的毒性和危害。