| SMETHPORT BOROUGH | | 2,400 | 0.9044 mg/L |
| AQUA PA MT JEWETT | | 972 | 0.8036 mg/L |
| THE VALLEY MHC | | 37 | 0.8002 mg/L |
| NORTH COVENTRY WATER SYSTEM | | 2,907 | 0.8000 mg/L |
| ZERBE SISTERS | | 210 | 0.7236 mg/L |
| SULLIVAN TRAIL VILLAGE | | 45 | 0.6695 mg/L |
| ELDERBERRY MHP | | 60 | 0.6400 mg/L |
| WARWICK WATER WORKS | | 98 | 0.6280 mg/L |
| EEI MEADOWS COMPLEX | | 628 | 0.6085 mg/L |
| MUNCY BOROUGH WATER COMPANY | | 2,900 | 0.4550 mg/L |
| ESTATES AT STONE ROW | | 48 | 0.4402 mg/L |
| NORTHERN TIER CHILDRENS HOME | | 45 | 0.3565 mg/L |
| CLYMER BORO MUNI AUTH | | 1,700 | 0.3402 mg/L |
| UNION TWP MUNICIPAL AUTHORITY | | 450 | 0.2736 mg/L |
| VILLAGE AT CAMELBACK | | 309 | 0.2254 mg/L |
| BRINTON MANOR | | 196 | 0.2167 mg/L |
| DUNCANNON MUNI WATER | | 2,000 | 0.2161 mg/L |
| VILLAGE OF BUCKINGHAM SPRINGS | | 1,295 | 0.2086 mg/L |
| BLUE HERON HOMEOWNERS ASSOC | | 450 | 0.2070 mg/L |
| MT GRETNA CAMPMEETING ASSN | | 375 | 0.1952 mg/L |
| PEDIATRIC SPECIALTY CARE | | 56 | 0.1890 mg/L |
| CUPEC MOBILE ESTATES | | 56 | 0.1869 mg/L |
| AQUA PA TANGLEWOOD LAKES | | 1,321 | 0.1707 mg/L |
| AQUA PA FIELDCREST | | 112 | 0.1618 mg/L |
| JOHNSONBURG MUNICIPAL AUTH | | 2,413 | 0.1612 mg/L |
| LOCUST GROVE MHP | | 49 | 0.1595 mg/L |
| TEEN CHALLENGE TRNG CTR | | 300 | 0.1532 mg/L |
| ROLLING HILLS MHP | | 150 | 0.1498 mg/L |
| VILLAS AT GEORGETOWN | | 30 | 0.1492 mg/L |
| WHEATFIELD VILLAGE | | 35 | 0.1474 mg/L |
| PEQUEA WATER COOP ASSN | | 121 | 0.1443 mg/L |
| LAUREL MOUNTAIN VILLAGE | | 100 | 0.1409 mg/L |
| BELLE AIRE ACRES | | 55 | 0.1395 mg/L |
| YERKES WATER ASSOCIATION | | 165 | 0.1394 mg/L |
| COPPER KETTLE MHP | | 62 | 0.1389 mg/L |
| MID LAKES DEVELOPMENT | | 490 | 0.1360 mg/L |
| COBBS LAKE PRESERVE | | 200 | 0.1290 mg/L |
| POLK CENTER | | 1,058 | 0.1277 mg/L |
| EVERGREEN MOBILE HOME PARK | | 75 | 0.1273 mg/L |
| FREELAND BORO MUNI WATER AUTH | | 4,610 | 0.1158 mg/L |
| RED ROCK JOB CORPS CENTER | | 425 | 0.1148 mg/L |
| EDGEWOOD MOBILE HOME PARK | | 117 | 0.1139 mg/L |
| HIMALAYAN INSTITUTE | | 124 | 0.1125 mg/L |
| BUCKINGHAM VLY REHAB & NURSING | | 190 | 0.1125 mg/L |
| LCA WASHINGTON TOWNSHIP DIV | | 965 | 0.1108 mg/L |
| ST MARYS VILLA NURSING HOME | | 353 | 0.1100 mg/L |
| LOYALTON WATER ASSN | | 100 | 0.1096 mg/L |
| ORCHARD HILLS MHP | | 303 | 0.1074 mg/L |
| CARBON COUNTY CORRECTIONAL FAC | | 125 | 0.1028 mg/L |
| ELK MEADOWS | | 96 | 0.1016 mg/L |
| LACEYVILLE WATER CO | | 415 | 0.1010 mg/L |
| AQUA PA PENN LAKE | | 150 | 0.0957 mg/L |
| EISENHOWER WATER SUPPLY | | 760 | 0.0954 mg/L |
| QUINCY TWP WATER SYSTEM | | 530 | 0.0945 mg/L |
| AQUA PA ROBIN HOOD LAKES | | 541 | 0.0936 mg/L |
| LAKE RAYLEAN WATER ASSOCIATION | | 47 | 0.0923 mg/L |
| WELSH MOUNTAIN HOME | | 53 | 0.0920 mg/L |
| PLEASANT HALL MANOR | | 50 | 0.0912 mg/L |
| LAZY K CAMPGROUND | | 75 | 0.0900 mg/L |
| WILL O HILL APTS | | 300 | 0.0890 mg/L |
| PINE TERRACE MOBILE HOME PARK | | 50 | 0.0867 mg/L |
| GRATZ BORO WATER REVENUE FUND | | 738 | 0.0856 mg/L |
| PILLOW BORO AUTH | | 312 | 0.0840 mg/L |
| FRANKLIN SYSTEM YORK WATER | | 4,400 | 0.0820 mg/L |
| LIBERTY VILLAGE | | 40 | 0.0818 mg/L |
| CENTRAL CITY WATER AUTH | | 1,984 | 0.0800 mg/L |
| HIGHLAND COURT | | 54 | 0.0795 mg/L |
| NORTHRIDGE AT CAMELBACK | | 330 | 0.0793 mg/L |
| CHICORA MEDICAL CENTER | | 150 | 0.0785 mg/L |
| SALTILLO MUNI WATER WORKS | | 350 | 0.0782 mg/L |
| HUEFNER SPRING WATER | | 300 | 0.0757 mg/L |
| TORRANCE STATE HOSPITAL | | 997 | 0.0736 mg/L |
| NEWPORT BORO WATER AUTH | | 3,200 | 0.0728 mg/L |
| SUNRISE LAKE SECTION 9 | | 125 | 0.0715 mg/L |
| BETH 512 SYSTEM | | 725 | 0.0708 mg/L |
| FRANKLIN TWP MUNI AUTH | | 441 | 0.0704 mg/L |
| HENRIETTA MUTUAL WATER ASSN | | 165 | 0.0700 mg/L |
| BEAVER RUN WATER ASSOCIATION | | 50 | 0.0684 mg/L |
| EASTVILLE WATER ASSOCIATION | | 75 | 0.0668 mg/L |
| PARAMOUNT SENIOR LIVING | | 250 | 0.0668 mg/L |
| LOCUST GROVE RETIREMENT HOME | | 177 | 0.0666 mg/L |
| JEFFERSON TWP WATER AND SEWER | | 350 | 0.0658 mg/L |
| PENNS CREEK MUNICIPAL AUTH | | 725 | 0.0645 mg/L |
| SUEZ WATER KENSINGTON SYSTEM | | 204 | 0.0641 mg/L |
| RAINSBURG BOROUGH WATER | | 200 | 0.0639 mg/L |
| HIDDEN VALLEY RESORT LP | | 750 | 0.0639 mg/L |
| HERITAGE HILLS RETIREMENT COMM | | 57 | 0.0635 mg/L |
| PAWC MANWALAMINK NS 3 | | 1,100 | 0.0632 mg/L |
| DEVEREUX POCONO CENTER | | 115 | 0.0626 mg/L |
| CHRISTIANA MUNI WATER AUTH | | 1,100 | 0.0625 mg/L |
| PAW WINOLA | | 63 | 0.0606 mg/L |
| BLAIN WATER CO | | 321 | 0.0606 mg/L |
| SOUTHERN CUMBERLAND WATER ASSN | | 400 | 0.0600 mg/L |
| MOUNTAIN VIEW VILLAGE | | 100 | 0.0596 mg/L |
| TAYLORS MOBILE HOME PARK | | 50 | 0.0589 mg/L |
| AQUA PA SUN VALLEY | | 120 | 0.0583 mg/L |
| PLATEAU VILLAGE MHP | | 125 | 0.0580 mg/L |
| CENTRE HALL BORO WATER DEPT | | 1,900 | 0.0578 mg/L |
| CONCORDIA LUTHERAN HOME | | 950 | 0.0568 mg/L |
| CAMBRIDGE AREA JOINT AUTH | | 225 | 0.0562 mg/L |