| PROVIDENCE-CITY OF | 333,142 | 51 | Clean |
| PAWTUCKET WATER SUPPLY BOARD VEOLIA-NA | 98,130 | 71 | Detected |
| EAST PROVIDENCE-CITY OF | 47,618 | 60 | Clean |
| WOONSOCKET WATER DIVISION | 45,828 | 127 | Detected |
| LINCOLN WATER COMMISSION | 21,664 | 18 | Clean |
| CUMBERLAND, TOWN OF | 21,235 | 157 | Detected |
| GREENVILLE WATER DISTRICT | 9,500 | 48 | Clean |
| SMITHFIELD WATER SUPPLY BOARD | 9,460 | 114 | Clean |
| BROWN UNIVERSITY HEALTH-RI HOSPITAL | 8,040 | 0 | Clean |
| CLEAR RIVER ELECTRIC AND WATER DISTRICT | 6,000 | 23 | — |
| SLATERSVILLE PUBLIC SUPPLY | 3,403 | 106 | — |
| DOWLING VILLAGE | 2,720 | 55 | — |
| BROWN UNIVERSITY HEALTH-MIRIAM HOSPITAL | 2,401 | 10 | — |
| PONAGANSET HIGH SCHOOL | 1,600 | 156 | Clean |
| SCITUATE HIGH SCHOOL & MIDDLE SCHOOL | 1,426 | 89 | — |
| NORTH SMITHFIELD JR_SR HIGH SCHOOL | 1,200 | 12 | — |
| WRIGHTS FARM CORP. | 1,125 | 334 | — |
| BOWDISH LAKE CAMPING AREA, BROWN 1 & 2 | 990 | 124 | — |
| PONAGANSET MIDDLE SCHOOL | 923 | 24 | — |
| ST. JOSEPHS CHURCH | 880 | 8 | — |
| RUSTIC TRI-VIEW DRIVE IN THEATRE-SNACK B | 800 | 101 | — |
| MAPLEHILL MOBILE HOME PARK | 750 | 162 | — |
| BURRILLVILLE MIDDLE SCHOOL | 650 | 38 | — |
| COLALUCA FAMILY CAMPGROUND | 600 | 31 | — |
| ST. MARY & ST. MENA COPTIC CHURCH OF RI | 600 | 3 | — |
| WEST GLOCESTER ELEMENTARY SCHOOL | 541 | 17 | — |
| ELEANOR SLATER HOSPITAL ZAMBARANO UNIT | 540 | 217 | — |
| NORTH SCITUATE ELEMENTARY | 500 | 138 | — |
| PROVIDENCE-CITY OF - WHIPPLE | 471 | 43 | — |
| CAPTAIN ISAAC PAINE SCHOOL | 460 | 18 | — |
| NORTH SMITHFIELD ELEMENTARY SCHOOL | 460 | 57 | — |
| PULASKI MEM PARK-BEACH AREA-DEM DIV. FOR | 450 | 15 | — |
| SPRING LAKE RECREATIONAL FACILITY | 450 | 10 | — |
| SCITUATE VILLAGE PLAZA | 450 | 121 | — |
| MONEY HILL PLAZA | 450 | 65 | — |
| FOGARTY MEMORIAL SCHOOL | 427 | 45 | — |
| CINDYS DINER & RESTAURANT, INC. | 400 | 15 | — |
| SLATERSVILLE MEDICAL COMPLEX | 400 | 224 | — |
| POWDER MILL CREAMERY | 400 | 59 | — |
| PINES EVENTS & PROMOTION, LLC AN0, THE | 330 | 33 | — |
| ASSADOS KITCHEN AND BAR | 310 | 33 | — |
| COUNTRY CHOWDER SHACK | 300 | 110 | — |
| CONFREDA GREENHOUSES & FARMS, LLC | 300 | 121 | — |
| LAKE FOREST HEALTH AND REHABILITATION | 268 | 82 | — |
| SHADY ACRES FRY SHACK LLC | 260 | 35 | — |
| FAMOUS PIZZA | 250 | 187 | — |
| CADYS TAVERN | 250 | 133 | — |
| VILLAGE ON CHOPMIST HILL, THE | 250 | 784 | — |
| MEROLA'S RESTAURANT & BAR | 250 | 57 | — |
| OAKLEAF CAMPGROUND | 235 | 42 | — |