First, make sure it tests for coliform bacteria. That’s the big one. If you have that, you might need to shock your well (sounds scary, but it’s just a bleach treatment).
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Second, check for heavy metals like lead and arsenic. These are flavorless and invisible, but they can mess with your health over time. Think of them as the quiet villains in your water story.
Third, look for nitrates and nitrites. These are common near farms or septic systems. They’re especially important if you have babies or pets drinking that water.