Legend (RIDEM/MS4_Regulated_Area)

US Census Urban Area 2020 (0) MS4 UA 2000 Census (9) MS4 UA 2010 Census (5) MS4 % Impervious Cover (10) < 6% 6 to 10 10 to 15 15 to 25 > 25 % Municipalities % Impervious Cover (11) < 6% 6 to 10 10 to 15 15 to 25 > 25 %