Jacksonville Water Hardness & Quality Report (2026)

JEA (Jacksonville Electric Authority) provides drinking water to Duval County and surrounding areas through multiple water treatment plants drawing from the Floridan Aquifer, the primary groundwater source for the region. Hardness varies significantly by service area: the highest levels are typically found near the St. Johns Forest area, with lower hardness in the Cecil Commerce area. JEA classifies hardness from soft (0–17.1 ppm) through very hard (180+ ppm) and publishes annual water quality reports—including the 2024 Water Quality Report—with hardness data by zip code and service area on its website.

The Floridan Aquifer underlies all of Florida and flows through extensive Eocene-age limestone and dolomite formations interspersed with ancient shell deposits left from Florida's prehistoric ocean floor. As groundwater travels through these mineral-rich carbonate rocks over thousands of years, it dissolves significant quantities of calcium and magnesium, resulting in a hard water supply. The geological character of the aquifer in the Jacksonville area produces hardness levels in the hard to very hard category, typical of most of central and southern Florida outside the northwestern regions.

At hard to very hard levels, Jacksonville residents see visible scale buildup on fixtures, faucets, and showerheads within days of cleaning, with soap scum accumulating rapidly on shower doors and bathroom surfaces. Mineral deposits clog pipes and reduce water pressure over time; appliances such as water heaters, dishwashers, and washing machines experience reduced efficiency and shortened lifespan. Hard water also strips natural oils from skin and hair. Most Jacksonville households benefit from point-of-use or whole-home water softening systems to mitigate these effects. JEA's water meets all federal and state drinking water standards.