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Freshwater-Saltwater Interface
A well dug in land bordering the ocean first strikes freshwater. Go deep enough and you hit saltwater. The location where freshwater meets saltwater is the freshwater-saltwater interface. The sea level affects this interface and rising sea levels may raise it. A rise in the interface means shallower drinking water wells. In some areas the rise might prevent the use of wells at all for freshwater, at least in areas very close to the ocean.
Increased Salinity
Aquifers contain freshwater normally held in porous rock. If the sea level rises gradually the aquifer level adjusts itself to keep the saltwater out. The land above the aquifer gradually accumulates sediment and rises with the sea level. However, if sea levels rise quickly the land is not able to adjust and saltwater enters the aquifer. Salinity in aquifers prevents the water from being used for drinking and other activities like laundry, dish washing and showers.
Water Quality
Water quality in aquifers is important for local communities. If the level of ocean water reaches 5 percent then the water is contaminated for household use according to the University of South Wales. The water is also unsuitable for irrigation of plants, crops, public parks or lawns.
High Water Table
The water table level rises with the sea level. This increase in the water table has several effects. They include leakage into septic tanks and sewer systems. Other problems associated with an increased water table level include water in basements and pressure on underground tanks and other buried objects. Swimming pools may feel some effect as the water affects the integrity of the walls if not properly secured.