Everyday life · FACT #19
Water density is roughly one gram per milliliter.
The USGS says water density is roughly 1 gram per milliliter, while noting that it changes with temperature and with substances dissolved in the water.
Source: U.S. Geological Survey
https://www.usgs.gov/water-science-school/science/water-density
https://www.usgs.gov/water-science-school/science/water-density