- WARNING: It is unlawful in CALIFORNIA, VERMONT, MARYLAND, LOUISIANA and the UNITED STATES OF AMERICA to use any product in the installation or repair of any public water system or any plumbing in a facility or system that provides water for human consumption if the wetted surface area of the product has a weighted average lead content greater than 0.25%. This prohibition does not extend to service saddles used in California, Louisiana or under USA Public Law 111-380.