Since the water supply is ...

Since the water supply is intended for drinking, it's concerning that you say the groundwater source has "various loads like iron". Iron can impart an unpleasant taste, but is not a particular health threat. However, groundwater sources can be contaminated with other substances (e.g. bacteria and viruses) that may be a health threat, as well as other organic and inorganic compounds that could be a serious health threat in sufficient concentrations. If you have not already done so, you should have the water analysed by a competent laboratory so that these threats can be assessed. Once this information is available, it will be much easier to recommend a treatment strategy.