How did you calculate the HPI? What formula did you use? Generally, the HPI is calculated using the equation given by Mohan et al. (1996); Milivojevic et al. (2016), and Chiamsathit et al. (2020).

The HPI value of drinking water less than 100 is classified as suitable for drinking (Balakrishnan and Ramu 2016).

For the classification of HPI see Sobhanardakania et al. (2016).

Regards

Thank you dear Bachir Achour

I have calculated HPI index according to Mohan et al. (1996), HPI (image attached)

I repeated the same process several times.

So I asked, "Is this okay, or do I have to look for the problem again?"

Thank you for responding.

Yes, this is the correct formula with, Qi is the subindex of the ith parameter, Wi is the unit weight of the ith parameter and n is the number of parameters considered; the subindex Qi of the parameter is as:

Qi=(vi/si)×100

where vi  is  the monitored value of the metal of ith parameter and si the standard value.

In my view, it is necessary to redo the calculations with great concentration because HPI values of 2500 seem excessive to me.

Thank you dear Bachir Achour

Same in my view also

I'll reconsider the calculations because the higher values (HPI > 2500)​​ don't seem logical.

Look at this paper

Article Health risk assessment of potentially toxic elements in Maro...

Thank you dear Kiprotich Kiptum

Dear Azzeddine Reghais . See the following useful RG link: Article Heavy metals concentration and pollution index (HPI) in drin...

Kindly see also the following useful RG link: Article Risk identification of heavy metals in well water surrounds ...

Also check please the following very good RG link: Article Assessment of Contamination Level, Pollution Risk and Source...

The following RG link is also very good: Article A Novel Approach for Indexing Heavy Metals Pollution to Asse...

Many thanks dear Aref Wazwaz

I will check all the links you mentioned

Great thanks

You are most welcome dear Azzeddine Reghais

Wish you the best always.

Please see this.

Article A Novel Approach for Indexing Heavy Metals Pollution to Asse...

See the link.

https://meridian.allenpress.com/jhp/article/10/26/200603/445412/Groundwater-Quality-and-Pollution-Index-for-Heavy

A lot thanks dear Sanjoy Kumar Bordolui