1. Short title This Act may be cited as the Sewage Treatment Overflow Prevention through Community Sanitation Outreach Act of 2019 or the STOP CSO Act of 2019 . 2. Monitoring, reporting, and public notification of sewer overflows (a) Sewer overflow and stormwater reuse municipal grants Section 221(a) of the Federal Water Pollution Control Act ( 33 U.S.C. 1301(a) ) is amended by adding at the end the following: (3) Use of funds A State may use funding provided by a grant under this subsection for monitoring, reporting, and notification required under section 402(t). . (b) National pollutant discharge elimination system Section 402 of the Federal Water Pollution Control Act ( 33 U.S.C. 1342 ) is amended— (1) in subsection (b)(2)(B), by inserting this section and after required in ; and (2) by adding at the end the following: (t) Sewer Overflow Monitoring, Reporting, and Notifications (1) General requirements After the last day of the 180-day period beginning on the date on which regulations are issued under paragraph (4), a permit issued, renewed, or modified under this section by the Administrator (or a State, in the case of a permit program approved by the Administrator) for a publicly owned treatment works shall require the owner or operator of the treatment works to— (A) institute and utilize a feasible methodology, technology, or management program for monitoring sewer overflows to alert the owner or operator to the occurrence of a sewer overflow in a timely manner; (B) in the case of a sewer overflow that has the potential to affect human health, notify the public of the overflow as soon as practicable, but in no case more than 4 hours, after the time the owner or operator knows of the overflow; (C) in the case of a sewer overflow that may imminently and substantially endanger human health, notify public health authorities and other affected entities, such as public water systems, of the overflow immediately after the owner or operator knows of the overflow