Saline intrusion
A key indicator for seawater contamination in coastal wells. The difference in conductivity between seawater and fresh groundwater is very marked, making it a useful indicator. See the LAWA factsheet for more information.
The graphs below show daily average conductivity in μS/cm (
) with warning thresholds in dashed red (
) set by GWRC that may reflect the onset of saline intrusion. See the overview map for locations of the bores below and hover over each chart series to see specific values.
