The PRO-LAB® LEAD IN WATER TEST KIT should be used as your first step in identifying lead in your water that could be harmful to your health and your home. The PRO-LAB® LEAD IN WATER TEST KIT offers you an accurate water analysis to EPA proficiency standards revealing the amount of lead in your water to as little as 1 ppb (EPA standard is 15 ppb). Laboratory results within 7 days. Express service is available for an additional fee.