Dear Bojan, Definitely you ...

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Dear Bojan,

Definitely you need to analyse water if it is for human consumption. I suggest at least Total Coliforms, heavy metals and hardness. If water is hard you will probably have carbonates precipitation in the downstream. Also I recommend a brief analyse of your well ¿How depth it is?  Do you have any potential source of impact in the aquifer (septic tank? for example?)

If it is located in rural area you may chose an easy and economic alternative...I agree with TUV, however everything will depend on your analytical results...groundwater is normally free of coliforms or other if the aquifer is depth enough and no impacted by external sources.