Synopsis As Introduced Amends the Illinois Plumbing License Law. Provides that certain lawn sprinkler systems shall not be required to be retrofitted with a reduced pressure zone (RPZ) valve until 5 years after the effective date of the amendatory Act. Provides that the Illinois Department of Public Health shall also provide an exemption for such lawn sprinkler systems from any requirement to retrofit a lawn sprinkler system with a RPZ valve if the Department finds that either the lawn sprinkler system cannot be retrofitted with a RPZ valve or that the costs of doing so would be unreasonably high. Effective immediately.