Subject area	Environmental Sciences
More specific subject area	Drinking water chemistry
Type of data	Table and figure
How data was acquired	Measurements of all parameters was done according to standard methods based on Standard Methods for the Examination of Water and Wastewater.
	Hardness parameters, alkalinity, calcium, bicarbonate and chloride were measured by titration method.
	Digital pH meter (Metrohm) was applied for pH analyzing.
	Sulfate was measured using Hach DR5000 spectrophotometer.
	Temperature was determined by digital thermometer.
	TDS was measured by scaling method.
Data format	Raw, analyzed
Experimental factors	The data were obtained monthly in both cold and warm season, winter and summer, and the pH and temperature measured in the place other samples after taking as standard method were stored in a dark place at 4 °C temperature and transferred to laboratory under 3 hours.
Experimental features	All the above mentioned parameters were acquired and the levels of all indices were calculated.
Data source location	Guilan Province, North of Iran, Iran (Fig. 1).
Data accessibility	All data are available within this article.