| STATE COLLEGE BORO WATER AUTH | 72,000 | 143 | Clean |
| PENN STATE UNIV | 37,000 | 171 | Clean |
| PAW PHILIPSBURG | 20,784 | 0 | Clean |
| BELLEFONTE BOROUGH WATER AUTH | 9,500 | 1,031 | Clean |
| COLLEGE TWP WATER AUTHORITY | 6,000 | 652 | Detected |
| ROCKVIEW SCI | 5,200 | 584 | Detected |
| MOUNTAINTOP REG WATER AUTH | 3,456 | 177 | — |
| SPRING TWP WATER AUTHORITY | 3,300 | 226 | Detected |
| WALKER TWP WATER ASSOC | 3,250 | 393 | — |
| MILESBURG BOROUGH WATER AUTH | 2,750 | 213 | — |
| CENTRE HALL BORO WATER DEPT | 1,900 | 94 | Clean |
| UPPER HALFMOON WATER | 1,500 | 124 | — |
| PAW NITTANY | 1,499 | 184 | — |
| BALD EAGLE STATE PARK | 1,276 | 55 | — |
| PENNS VALLEY AREA HIGH SCHOOL | 1,170 | 262 | — |
| BOROUGH OF HOWARD | 1,001 | 392 | — |
| ROCK SPRING WATER CO | 1,000 | 807 | — |
| MILLHEIM BOROUGH WATER COMPANY | 902 | 786 | — |
| OAK RIDGE AUTHORITY | 700 | 690 | — |
| HAMPTON HILLS BENNER TWP AUTH | 684 | 7 | — |
| GREGG TOWNSHIP WATER AUTHORITY | 670 | 465 | — |
| PORT MATILDA WATERWORKS | 615 | 919 | — |
| HAINES AARONSBURG MUN AUTH | 550 | 899 | — |
| MILES TWP WATER AUTH EAST | 425 | 427 | — |
| PENN TWP WATER DIST | 300 | 156 | — |
| HALFMOON WATER ASSOCIATION | 300 | 187 | — |
| RIDGE CREST COMMUNITY | 300 | 79 | — |
| UNIONVILLE MUNICIPAL WATERWKS | 290 | 141 | — |
| THE MEADOWS | 289 | 61 | — |
| MADISONBURG WATER WORKS | 250 | 713 | — |
| SEVEN MOUNTAINS SCOUT CAMP | 200 | 35 | — |
| BURKHOLDERS MARKET | 200 | 41 | — |
| HOMANS GENERAL STORE | 200 | 9 | — |
| GROVE PARK BENNER TWP AUTH | 185 | 80 | — |
| TROTTER FARMS | 175 | 101 | — |
| KRISLUND CAMP & CONFERENCE CTR | 160 | 54 | — |
| HAINES WOODWARD MUNICIPAL AUTH | 140 | 471 | — |
| MONUMENT WATER AUTHORITY | 140 | 503 | — |
| MOUNT EAGLE WATER ASSOC | 130 | 3,283 | — |
| BELLEFONTE CAMPGROUND LLC | 125 | 46 | — |
| ST JOSEPH INSTITUTE | 109 | 0 | — |
| CENTRE COUNTY MHC LLC | 100 | 847 | — |
| BLACK HAWK MOBILE HOME PARK | 100 | 84 | — |
| PAW BOGGS | 100 | 28 | — |
| BLACK MOSHANNON STATE PARK | 100 | 13 | — |
| BELLEFONTE KOA CAMPGROUND | 100 | 44 | — |
| PENN-ROOSEVELT STATE PARK | 100 | 19 | — |
| COUNTRY TIME COFFEE COMPANY | 100 | 0 | — |
| POE VALLEY STATE PARK | 90 | 55 | — |
| POE PADDY STATE PARK | 90 | 45 | — |