The Southern Nevada Water Authority (or local water purveyor) will conduct water quality testing outside the building of a facility. Many water purveyors work with the Sothern Nevada Water Authority, but not all. Contact the individual water purveyor as needed. Multiple water samples will be collected and the Boil Water Advisory will not be lifted until the test results show the water is safe; these tests can take up to 48 hours. Additional sampling (from inside the building) will be required for large facilities. Testing must be performed by a qualified water-testing laboratory. The Southern Nevada Health District can provide assistance with making these arrangements, if needed. All costs incurred will be the responsibility of the facility. A minimum of two water samples that have been collected 24 hours apart will be required.