| MILTON WATER WORKS | MILTON, IN | 650 | 49 | — |
| AQUA INDIANA - WEDGEWOOD PARK WATER UTIL | INDIANAPOLIS, IN | 645 | 130 | — |
| CLINTON CENTRAL ELEMENTARY SCHOOL | MICHIGANTOWN, IN | 643 | 14 | — |
| NORTHWESTERN ELEMENTARY SCHOOL | KOKOMO, IN | 634 | 21 | — |
| TRAIL TREE/MIDCONTINENT INN INC. | WINAMAC, IN | 632 | 144 | Detected |
| MADISON-GRANT HIGH SCHOOL | FAIRMOUNT, IN | 630 | 131 | — |
| ST. MALACHY CATHOLIC PARISH - CHURCH | BROWNSBURG, IN | 630 | 10 | — |
| CENTER POINT WATER WORKS | CENTERPOINT, IN | 625 | 127 | — |
| MCCLURE OIL CORPORATION-STORE #9 | MARION, IN | 620 | 18 | — |
| ELNORA WATER WORKS | ELNORA, IN | 620 | 113 | — |
| MEDARYVILLE WATER COMPANY | MEDARYVILLE, IN | 614 | 82 | — |
| NORTHPOINT ELEMENTARY SCHOOL | MISHAWAKA, IN | 612 | 5 | — |
| HERSHEY ELEMENTARY SCHOOL | LAFAYETTE, IN | 612 | 7 | — |
| TIPPECANOE VALLEY HIGH SCHOOL | AKRON, IN | 611 | 104 | — |
| CAMDEN WATER UTILITY | CAMDEN, IN | 611 | 3 | — |
| NORTHEASTERN WAYNE SCHOOL/CONCESSION | FOUNTAIN CITY, IN | 610 | 7 | — |
| INDIANA AMERICAN WATER - RIVERS EDGE | GREENWOOD, IN | 610 | 0 | — |
| HEARTLAND CHRISTIAN CENTER | VALPARAISO, IN | 608 | 55 | — |
| OUABACHE STATE PARK MAIN SUPPLY | BLUFFTON, IN | 608 | 47 | — |
| LUKE OIL #293 | HOBART, IN | 606 | 168 | — |
| INDIANA AMERICAN WATER - WAVELAND | GREENWOOD, IN | 605 | 939 | — |
| CIRCLE K #2372 - NORTH WEBSTER | COLUMBUS, IN | 602 | 153 | — |
| CAMP LAKEWOOD UNITED METHODIST-PUMPHOUSE | WOLCOTTVILLE, IN | 602 | 105 | — |
| MADHAR PETROLEUM | INDIANAPOLIS, IN | 602 | 161 | — |
| ST. MICHAELS CHURCH | WATERLOO, IN | 601 | 10 | — |
| MAXWELL MIDDLE SCHOOL | GREENFIELD, IN | 600 | 99 | — |
| HAZELWOOD CHRISTIAN CHURCH | CLAYTON, IN | 600 | 71 | — |
| NORTH MIAMI ELEMENTARY SCHOOL | DENVER, IN | 600 | 317 | — |
| BOONE GROVE HIGH SCHOOL | VALPARAISO, IN | 600 | 72 | — |
| STEUBEN COUNTY PARK - CAMPGROUND | ANGOLA, IN | 600 | 27 | — |
| AMERIMART | LAFAYETTE, IN | 600 | 15 | — |
| OUABACHE STATE PARK YOUTH TENT | BLUFFTON, IN | 600 | 55 | — |
| CAMP WHITLEY, INC. | COLUMBIA CITY, IN | 600 | 132 | — |
| MECKS WHISPERING PINES II LLC | WEST COVINA, IN | 598 | 61 | — |
| PLEASANT VIEW BIBLE CHURCH/DC | WARSAW, IN | 597 | 22 | — |
| TURKEY CREEK REGIONAL SEWER DISTRICT | CROMWELL, IN | 593 | 90 | — |
| EAST TIPPECANOE MIDDLE SCHOOL | LAFAYETTE, IN | 589 | 9 | Clean |
| WAWASEE MIDDLE SCHOOL | SYRACUSE, IN | 588 | 17 | — |
| BRENNEMAN MEMORIAL CHURCH | GOSHEN, IN | 580 | 68 | — |
| CARROLL JR./SR. HIGH SCHOOL | FLORA, IN | 579 | 61 | — |
| LOVES TRAVEL PLAZA - KNIGHTSTOWN (#601) | WANATAH, IN | 575 | 0 | — |
| OREGON-DAVIS ELEMENTARY & HIGH SCHOOL | HAMLET, IN | 575 | 137 | — |
| NORTH LIBERTY CHURCH OF CHRIST | NORTH LIBERTY, IN | 574 | 150 | — |
| ROLLING PRAIRIE ELEMENTARY | NEW CARLISLE, IN | 570 | 115 | — |
| PILOT #029 | KNOXVILLE, IN | 570 | 86 | — |
| ELANCO CLINTON LABS | CLINTON, IN | 570 | 7 | — |
| WHITKO CAREER ACADEMY | LARWILL, IN | 570 | 39 | — |
| JIMTOWN HIGH SCHOOL | ELKHART, IN | 566 | 130 | — |
| NORTHERN HEIGHTS ELEMENTARY SCHOOL | COLUMBIA CITY, IN | 566 | 544 | — |
| BLOOMINGDALE WATER WORKS | BLOOMINGDALE, IN | 562 | 680 | — |