1. Short title This Act may be cited as the Stop Sewage Overflow Act . 2. Sewer overflow and stormwater reuse municipal grants Section 221 of the Federal Water Pollution Control Act ( 33 U.S.C. 1301 ) is amended— (1) in subsection (b)— (A) in paragraph (3), by striking or ; (B) in paragraph (4), by striking the period at the end and inserting ; or ; and (C) by adding at the end the following: (5) is a municipality with high levels of sewage in the rivers of such municipality. ; (2) in subsection (d)— (A) by striking The Federal share and inserting the following: (1) In general Except as provided in paragraph (2), the Federal share ; and (B) by adding at the end the following: (2) Exception for certain projects (A) In general The Federal share of the cost of activities carried out using amounts from a grant made under subsection (a) for a municipality described in subsection (b)(5) shall be as follows: (i) Not less than 55 percent for municipalities the affected residents of which pay, on average, 2.0 percent or less of their household income for sewer service. (ii) Not less than 60 percent for municipalities the affected residents of which pay, on average, more than 2.0 percent, but not more than 2.5 percent, of their household income for sewer service. (iii) Not less than 65 percent for municipalities the affected residents of which pay, on average, more than 2.5 percent, but not more than 3.0 percent, of their household income for sewer service. (iv) Not less than 70 percent for municipalities the affected residents of which pay, on average, more than 3.0 percent, but not more than 3.5 percent, of their household income for sewer service. (v) Not less than 75 percent for municipalities the affected residents of which pay, on average, more than 3.5 percent of their household income for sewer service. (B) Affected residents defined For purposes of this paragraph, the term affected resident means a resident of a municipality who is in the 20th percentile of income for the municipality.