I recently read a pop-science article about sea-water infilitration into (sweet) groundwater. One specific instance mentioned was the gaza strip: Exzessive well building and drawing of groundwater lowers the groundwater level, this leads to sea water infiltration. Then the article states the the nitrate content in the groundwater is higher, leading to blue baby sysndrome.
Now, I assume that an elevated nitrate content in the groundwater is due to fertilizer runoff, damaged sewer systems or similiar and unrelated to the saltwater problem, the author of the article simply mixed those problems up. But I'm not sure, hence this question: Is there any causal link between sea-water inflitration and groundwater nitrate?
An answer not specific to Gaza would be ok as I want to understand possible mechanisms.