| BROCKTON WATER DEPARTMENT | 105,643 | 110 | Clean |
| PLYMOUTH WATER DEPARTMENT | 46,799 | 37 | Detected |
| WEIR RIVER WATER SYSTEM | 45,339 | 41 | Detected |
| MARSHFIELD WATER DEPARTMENT | 34,000 | 109 | Detected |
| ABINGTON/ROCKLAND JOINT WTR. WORKS | 33,647 | 48 | Detected |
| MATTAPOISETT RIVER VALLEY W.D. | 29,600 | 4 | Clean |
| BRIDGEWATER WATER DEPARTMENT | 28,633 | 55 | Detected |
| WAREHAM FIRE DISTRICT | 21,418 | 38 | Clean |
| SCITUATE WATER DIVISION | 19,297 | 94 | Detected |
| PEMBROKE WATER DIVISION DPW | 18,251 | 42 | Detected |
| DUXBURY WATER DEPARTMENT | 16,387 | 22 | Detected |
| MIDDLEBOROUGH WATER SUPPLY | 15,350 | 32 | Detected |
| HANOVER WATER DEPT | 14,984 | 51 | Detected |
| WHITMAN WATER SYSTEM | 14,837 | 50 | Detected |
| KINGSTON WATER DEPARTMENT | 14,712 | 86 | Clean |
| EAST BRIDGEWATER WATER DEPT | 14,526 | 101 | Detected |
| NORWELL WATER DEPARTMENT | 11,495 | 27 | Detected |
| HANSON WATER DEPARTMENT | 9,546 | 123 | Detected |
| AQUARION WATER COMPANY, PINEHILLS | 9,195 | 1 | Detected |
| WEST BRIDGEWATER WATER DEPT | 7,856 | 110 | Detected |
| MATTAPOISETT WATER DEPARTMENT | 7,685 | 20 | Clean |
| HALIFAX WATER DEPARTMENT | 7,553 | 53 | Detected |
| MARION WATER DIVISION | 5,761 | 42 | Clean |
| ONSET FIRE DISTRICTWATER DEPT. | 5,392 | 72 | Detected |
| PLYMOUTH SOUTH HIGH SCHOOL | 2,875 | 124 | — |
| MCI BRIDGEWATER | 2,802 | 33 | — |
| AGAWAM SPRINGS WATER COMPANY | 2,380 | 6 | — |
| AQUARION WATER COMPANY | 2,267 | 11 | — |
| FREETOWN/LAKEVILLE REGIONAL SCHOOL DIST. | 1,991 | 19 | — |
| V A BOSTON HEALTHCARE SYSTEM BROCKTON | 1,500 | 0 | — |
| CARVER HIGH SCHOOL AND MIDDLE SCHOOL | 1,200 | 18 | — |
| CRANBERRYACRES JELLYSTONE PARK | 1,000 | 27 | — |
| EDAVILLE RAILROAD | 1,000 | 14 | — |
| PLYMOUTH SO.ELEM.SCH. | 950 | 41 | — |
| CARVER ELEMENTARY SCHOOL | 800 | 83 | — |
| NEW HOPE CHAPEL | 787 | 0 | — |
| SOUTH MEADOW VILLAGE | 750 | 77 | — |
| ROCHESTER MEMORIAL SCHOOL | 688 | 18 | — |
| GEORGIOS PIZZA | 600 | 59 | — |
| ROCKY MOUNTAIN SPRING WATER VENDING | 500 | 2 | — |
| DCR MYLES STANDISH STATE FOREST | 500 | 23 | — |
| CARVER DUNKIN DONUTS | 500 | 48 | — |
| INDIANHEAD RESORT | 500 | 30 | — |
| SANDY POND CAMPGROUND | 500 | 23 | — |
| HARVEST FARM SPRINGS PUBLIC WATER SUPPLY | 500 | 2 | — |
| CRANBERRY VILLAGE RESIDENTS ASSOCIATION | 414 | 23 | — |
| ERICKSONS ICE CREAM CAFE INC | 400 | 23 | — |
| ELLIS HAVEN | 400 | 29 | — |
| CAMP SQUANTO, BOY SCOUTS OF AMERICA | 400 | 88 | — |
| OLD COLONY REG.VOC.TECH. HIGH SCH. | 400 | 15 | — |