Can you elaborate your question a bit. Is it about which waters are more contaminated or the qualities effect on heavy metals?

Some water quality effects on heavy metals could be that high concentrations of humic acids (brown water) tend to make complexes of most heavy metals, which makes the heavy metals more soluble, but less bio-available.

Dear Mr Henrik Rasmus Andersen

I mean the effect of water quality on heavy metals, for example, high hardness of water causes sedimentation of copper nanoparticles.

The amount and composition of dissolved solids, including heavy metals present in groundwater, primarily govern water quality. The quality of groundwater is slowly but steadily declining worldwide. Hydrological, physical, chemical, and biological factors all play a significant role in determining groundwater quality. The attention comprehending the impact of metallic pollutants, primarily focusing on their elevated toxicological behavior of polluted water .. The heavy metal particles are nonbiodegradable and could popularly amass inside the dwelling organisms, accordingly are carcinogenic and teratogenic. Contaminated water with heavy metal ions like Cr (VI), Cd (II), Pb (II), As (V and III), Hg (II), Ni (II), and Cu (II) is responsible for several health issues in humans, like liver failure, kidney damage, gastric and skin cancer, mental disorders and harmful effects on the reproductive system. Because of their high degree of toxicity, arsenic, cadmium, chromium, lead, and mercury rank among the priority metals that are of public health significance

Dear Parivash Layeghi, Along that type of effects also higher concentration of some anions, like chloride, result in formation of complexes of metals which , like complexes by humic acids, increase solubility but decrease bio-availabity.

Another water quality that come to mind to consider is if the water is occasionally anaerobic, which means it is likely to have sulfide from sulfate reduction. The significance is heavy metals mostly form very insoluble salts with sulfides which limits solubility of the metal ions more than precipation as oxides and carbonates such as is determined by high alkalinity.

SO42- -> S2-

Cd2+ + S2- -> CdS(s)

Dissolution of heavy metal is very much controlled by pH of water. In acidic water, solubility of heavy metal is comparatively more.