| MHOG SEWER & WATER AUTHORITY | 17,046 | 4 | Detected |
| BRIGHTON, CITY OF | 10,210 | 6 | Clean |
| HOWELL, CITY OF | 9,914 | 8 | Detected |
| LIVINGSTON COMMUNITY WATER AUTHORITY | 4,152 | 0 | — |
| HARTLAND TOWNSHIP | 3,022 | 6 | — |
| CHILSON COMMONS / KROGER | 3,000 | 25 | — |
| FOWLERVILLE, VILLAGE OF | 2,951 | 25 | — |
| PINCKNEY, VILLAGE OF | 2,353 | 11 | — |
| OAK POINTE | 2,000 | 6 | — |
| MCDONALDS #4991 | 1,900 | 17 | — |
| CIDERMILL CROSSINGS | 1,863 | 0 | — |
| HARTLAND MEADOWS | 1,543 | 0 | — |
| CORNERSTONE CHRISTIAN SCHOOL | 1,500 | 30 | — |
| WOODLAND RIDGE | 1,400 | 72 | — |
| WALDENWOODS-CAMPGROUND-1&2 | 1,263 | 9 | — |
| FONDA LAKE WATER AUTHORITY | 1,200 | 12 | — |
| HIDDEN LAKES OF GREEN OAKS | 1,148 | 2 | — |
| PINCKNEY SCHOOLS - HIGH SCHOOL | 1,135 | 27 | — |
| TYRONE WOODS | 1,088 | 29 | — |
| HANDY TOWNSHIP - RED CEDARS CROSSING | 1,030 | 4 | — |
| SYLVAN GLEN ESTATES | 1,015 | 24 | — |
| MOUNT BRIGHTON SKI RESORT | 950 | 10 | — |
| BRIGHTON SCHOOLS - MALTBY INTERMEDIATE | 950 | 7 | — |
| BRIGHTON SCHOOLS - SCRANTON MIDDLE | 920 | 9 | — |
| GREEN OAK TWP - CENTENNIAL FARMS | 900 | 10 | Clean |
| ST. JOHN CATHOLIC CHURCH - HOWELL | 900 | 1 | — |
| SPICER'S CIDER MILL AND WINERY | 900 | 0 | — |
| PINCKNEY SCHOOLS - FINE ART + NAVIGATOR | 850 | 7 | — |
| LAKE CHEMUNG OUTDOOR RESORT | 840 | 0 | — |
| HARTLAND SCHOOLS - FARMS MIDDLE SCHOOL | 830 | 4 | — |
| COVENTRY WOODS MHC | 823 | 19 | — |
| CHURCH OF GOD -TYRONE VALLEY (CAFETERIA) | 800 | 6 | — |
| MILLPOINTE OF HARTLAND | 724 | 7 | — |
| ST. MARY MAGDALEN CATHOLIC CHURCH | 700 | 5 | — |
| BRIGHTON SCHOOLS - HORNUNG ELEMENTARY | 620 | 4 | — |
| WOODLAND CENTER CORRECTIONAL FACILITY | 607 | 18 | — |
| BRIGHTON SCHOOLS - HILTON ELEMENTARY | 576 | 12 | — |
| ST. MARY'S CATHOLIC CHURCH & SCHOOL | 575 | 0 | — |
| CEDAR CREEK CENTER | 565 | 0 | — |
| BRIGHTON SCHOOLS - SPENCER ELEMENTARY | 550 | 6 | — |
| BRIGHTON SCHOOLS - HAWKINS ELEMENTARY | 550 | 6 | — |
| PINCKNEY SCHOOLS - PATHFINDER SCHOOL | 550 | 75 | — |
| LAKEVIEW PLAZA | 550 | 10 | — |
| BRUMMER ELEMENTARY | 550 | 6 | — |
| HARTLAND SCHOOLS - LAKES ELEMENTARY | 546 | 6 | — |
| HARTLAND SCHOOLS - VILLAGE ELEMENTARY | 510 | 18 | — |
| PRENTIS ESTATES APARTMENTS | 500 | 20 | — |
| LAKE CHEMUNG OUTDOOR RESORT | 500 | 6 | — |
| HAMBURG DAIRY QUEEN | 500 | 2 | — |
| NORTHRIDGE CHURCH OF BRIGHTON | 500 | 13 | — |