Top sparkling waters tested in 2026 Hawaii Volcanic: 89/100 - sourced from lava rock aquifer - nitrate is only contaminant detected - natural minerals Acqua Filette Sparkling: 96/100 - sourced from Italian mountains - lab tests found only natural minerals and minor amounts of nitrate as well Gerolsteiner: 79/100 - some radioactive particles detected - makes up for it with very high calcium and magnesium - fluoride detected below guidelines Hildon Mineral Water: 93/100 - natural sourced water from the UK - lab test found low contaminant and solid calcium levels Loonen: 87/100 - heavily purified spring water - comes with nearly no contamination - added minerals San Pellegrino and Saratoga are also okay too if those are your options Full reports on Oasis