Dear ENg. chinenye,  ...

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Dear ENg. chinenye, 

Regarding to you question please note that the most important parameter you need to collect as chemical parameter are as below : 

- TDS - Total Dissolved Salts 

- TH - Total Hardness 

- pH 

-TA- Total Alkalinty 

- Na+- Sodium cations conc.

-K+- Potassium cation conc.

-Ca++- Calcium Cations conc. 

-Mg++- Magnisium Cation conc.

-Fe ++/Fe+++ - Iron cation 

-Si -Silica

-Cl- /Cloride anion 

-SO4-- / Sulfate anion 

-HCO3- /Bicarbonat anion

 Nitrates and Nitretes anion 

NH3+- N khjeldal

you need also to check if there is any heavy metals and depends on the area if there is any near industrial area or battrey manufacture . etc