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a proper water test from a reputable lab that tests for dangerous contaminants like lead, not just a TDS test.
Total Dissolved Solids tests are what the filter companies to scare you into buying their filter systems. They'll take your tap water, put their TDS meter in it, go "Oh my god, look at how high it is! you need filtration immediately!" and try to sell you an overpriced system immediately.
You know whats dissolved in water? All the minerals and other crap that makes water good for you. Thats why a TDS meter spikes even in bottled water. But its an excellent scare trap for the uninformed by the predatory.