Aqua Science and ETR Laboratories not only offer water testing for homeowners and families. ETR is also the laboratory that other water testing companies and leading water filtration brands in the country rely on when they need accurate results they can stand behind. Some of the most recognized names in the water quality industry send us thousands of samples per year because they trust our in-house laboratory to deliver the precision and consistency their own customers expect. When a company’s reputation depends on the accuracy of a water test, they send it to ETR.