| SPRINGDALE WATER UTILITIES | 98,948 | 3 | Clean |
| ROGERS WATER UTILITIES | 81,443 | 1 | Clean |
| BENTONVILLE WATER UTILITIES | 51,250 | 23 | Detected |
| BELLA VISTA POA | 39,419 | 54 | Clean |
| CENTERTON WATERWORKS | 27,243 | 82 | Clean |
| SILOAM SPRINGS WATERWORKS | 21,430 | 28 | Detected |
| PEA RIDGE WATERWORKS | 10,820 | 4 | Clean |
| GENTRY WATERWORKS | 7,910 | 20 | Clean |
| BENTON COUNTY WATER DISTRICT #1 | 6,730 | 12 | Clean |
| CAVE SPRINGS WATERWORKS | 5,365 | 337 | Clean |
| GRAVETTE WATERWORKS | 4,900 | 17 | Clean |
| HIGHFILL WATER DEPARTMENT | 3,970 | 69 | — |
| NW ARKANSAS REGIONAL AIRPORT | 3,538 | 38 | — |
| DECATUR WATERWORKS | 2,468 | 135 | Detected |
| GATEWAY PUBLIC WATER AUTHORITY | 2,325 | 24 | — |
| BENTON COUNTY WATER AUTHORITY5 | 1,813 | 36 | — |
| LOST BRIDGE VILL WAT-SEW DISTS | 1,050 | 27 | — |
| GARFIELD WATERWORKS | 758 | 59 | — |
| CAMP WAR EAGLE | 700 | 4 | — |
| BENTON COUNTY WATER AUTHORITY4 | 635 | 32 | — |
| SULPHUR SPRINGS WATERWORKS | 580 | 46 | — |
| OAKHILLS SURB IMPROVMENT DIST | 133 | 37 | — |
| LEISURE HILLS MOBILE HOME PARK | 113 | 255 | — |
| OLD BELLA VISTA POA | 83 | 195 | — |
| BEAVER WATER DISTRICT | 54 | 1 | — |
| MOUNTAIN DEVELOPMENT | 50 | 79 | — |
| VENTRIS TRAILS END RESORT | 50 | 0 | — |
| PINE TOP WATER FACILITIES BOARD | 48 | 2 | — |
| PRIMO REFILL WMSC 5260 ROGERS | 30 | 12 | — |
| PRIMO WMNM5738 SPRINGDALE | 30 | 3 | — |
| GLACIER MERC101 SPRINGDALE | 30 | 21 | — |
| GLACIER SMERC300 ROGERS | 30 | 9 | — |
| GLACIER WATER FAMD4372 ROGERS | 30 | 3 | — |
| PRIMO REFILL LLC AKINS NF19 ROGERS | 30 | 0 | — |
| PRIMO REFILL LLC WMNM4686 BENTONVILLE | 30 | 2 | — |
| PRIMO WMNM6953 CENTERTON | 30 | 2 | — |
| PRIMO WMNM6971 PEA RIDGE | 30 | 19 | — |
| PRIMO WMNM6960 SILOAM SPRINGS | 30 | 0 | — |
| PRIMO WMNM2686 BENTONVILLE | 30 | 0 | — |
| PRIMO WMNM4376 BENTONVILLE | 30 | 5 | — |
| PRIMO WMNM3654 ROGERS | 30 | 6 | — |
| PRIMO WMNM3164 BENTONVILLE | 30 | 0 | — |
| PRIMO WMNM4516 FAYETTEVILLE | 30 | 4 | — |
| PRIMO GLACIER HF122 CENTERTON | 30 | 2 | — |
| PRIMO CVS10519 SPRINGDALE | 30 | 0 | — |
| PRIMO WMSC0100 BENTONVILLE | 30 | 14 | — |
| PRIMO REFILL ROGERS WAL-MART 01 | 30 | 29 | — |
| PRIMO REFILL SILOAM SPRINGS IGA | 30 | 10 | — |
| PRIMO REFILL NEIGHBORHOOD MARKET | 30 | 9 | — |
| PRIMO REFILL WMSC0004 SILOAM SP | 30 | 18 | — |