Ocean Springs Water Hardness & Quality Report (2026)

Ocean Springs, Mississippi, in Jackson County — a Jackson County city adjacent to Biloxi and Gautier on the Mississippi Gulf Coast, across the Bay of Biloxi from Biloxi — receives its municipal water from the Ocean Springs Water Division, drawing from the Gulf Coast aquifer (Miocene-Pliocene, Jackson County) through municipal production wells.

The moderately hard 140 mg/L hardness and elevated TDS of 438.9 mg/L (high TDS relative to hardness, typical of coastal aquifer) reflect the Mississippi Gulf Coast Miocene-Pliocene aquifer system. The Gulf Coast aquifer at Ocean Springs is developed in the Miocene Hattiesburg Formation (calcareous-iron-bearing sand-clay — moderate carbonate) and Pliocene Citronelle Formation (calcareous fine sand), with possible upward mixing from the Eocene Lisbon Formation. The elevated TDS relative to moderate hardness suggests some chloride-sulfate enrichment from the coastal proximity to the Gulf of Mexico.

At 140 mg/L, Ocean Springs' water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and bathroom fixtures develop calcium deposits. Quarterly descaling is appropriate. The PFAS level of 6.9 ppt warrants a certified drinking water filter — Keesler Air Force Base (Harrison County — AFFF in the Biloxi-Ocean Springs coastal area), the Jackson County Gulf Coast industrial corridor, and the Mississippi Gulf Coast PFAS background contribute to Ocean Springs' readings.