1. Short title This Act may be cited as the PFAS Monitoring Act of 2019 . 2. Testing for PFAS Section 1445 of the Safe Drinking Water Act ( 42 U.S.C. 300j–4 ) is amended by adding at the end the following: (k) Monitoring for PFAS in public water systems (1) In general The Administrator shall, not later than 6 months after the date of enactment of this subsection, promulgate regulations that require, beginning not later than one year after such date of enactment, monitoring for perfluoroalkyl and polyfluoroalkyl substances with at least one fully fluorinated carbon atom— (A) by all public water systems serving 10,000 persons or more; (B) with respect to public water systems serving between 3,300 and 10,000 persons— (i) by all such public water systems, if appropriations are available to cover the reasonable cost of such testing and laboratory analysis as are necessary to carry out the monitoring; or (ii) by a representative sample of such public water systems, if such appropriations are not available; and (C) by a representative sample of public water systems serving fewer than 3,300 persons. (2) Public availability of results All results of monitoring carried out under this subsection shall be accessible to the public and posted online by the Administrator. (3) Covered PFAS The Administrator shall require under the regulations promulgated under paragraph (1)— (A) during the period beginning on the effective date of such regulations and ending on the date test methods are validated under paragraph (4), monitoring for at least 30 perfluoroalkyl and polyfluoroalkyl substances with at least one fully fluorinated carbon atom