68e07683_SAHRA___Home_Water_Testing__Likely_source
[Lab result] Sodium high [Potential health effects] High sodium levels are harmless for most people, but can be dangerous for the elderly, people with high blood pressure, pregnant women, and people having difficulty in excreting sodium. [Treatment options] Addition of acid chemicals or reverse osmosis or distillation systems (POE or POU) [Likely source] 
Naturally occurring, brine intrusion/seepage
SAHRA - Home Water Testing
Likely source