68e07683_SAHRA___Home_Water_Testing__Likely_source
[Lab result] Nitrate [Potential health effects] Methemoglobinemia, a blood disorder that primarily affects babies, is caused by having too much nitrate in the body, preventing blood from delivering oxygen efficiently to different parts of the body. As a result, the infant may have blueness around the mouth, hands, and feet. Without treatment and removal of nitrate from drinking water, the condition can worsen and affect breathing. Other signs of the syndrome include vomiting and diarrhea. [Treatment options] Reverse osmosis or distillation systems (POU) [Likely source] 
Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits
SAHRA - Home Water Testing
Likely source