| DARDANELLE WATERWORKS | | 4,517 | 0.0044 ug/L |
| CENTRAL ARKANSAS WATER | | 368,455 | Not detected |
| FAYETTEVILLE WATERWORKS | | 116,398 | Not detected |
| SPRINGDALE WATER UTILITIES | | 98,948 | Not detected |
| FORT SMITH WATER UTILITIES | | 86,209 | Not detected |
| JONESBORO WATER SYSTEM | | 81,888 | Not detected |
| ROGERS WATER UTILITIES | | 81,443 | Not detected |
| HOT SPRINGS UTILITIES | | 75,343 | Not detected |
| CONWAY WATER SYSTEM | | 64,008 | Not detected |
| BENTONVILLE WATER UTILITIES | | 51,250 | Not detected |
| TEXARKANA WATER UTILITIES | | 50,815 | Not detected |
| LIBERTY UTILITIES | | 43,438 | Not detected |
| BELLA VISTA POA | | 39,419 | Not detected |
| JACKSONVILLE WATERWORKS | | 32,875 | Not detected |
| PARAGOULD MUNICIPAL UTILITIES | | 31,188 | Not detected |
| BENTON WATERWORKS | | 30,681 | Not detected |
| CABOT WATERWORKS | | 30,063 | Not detected |
| CITY CORPORATION | | 29,260 | Not detected |
| SEARCY WATERWORKS | | 28,196 | Not detected |
| CENTERTON WATERWORKS | | 27,243 | Not detected |
| VILONIA WATERWORKS | | 24,690 | Not detected |
| WEST MEMPHIS WATERWORKS | | 24,419 | Not detected |
| SALEM WATER USERS LLC | | 22,775 | Not detected |
| VAN BUREN WATERWORKS | | 22,725 | Not detected |
| SILOAM SPRINGS WATERWORKS | | 21,430 | Not detected |
| TRI-COUNTY WATER DISTBR DIST | | 20,394 | Not detected |
| WASHINGTON WATER AUTHORITY WWA | | 20,140 | Not detected |
| MOUNTAIN HOME WATERWORKS | | 19,618 | Not detected |
| BRYANT WATERWORKS | | 19,607 | Not detected |
| COMMUNITY WATER SYSTEM | | 18,628 | Not detected |
| EL DORADO WATERWORKS | | 17,932 | Not detected |
| HARRISON WATERWORKS | | 17,455 | Not detected |
| HOT SPRINGS VILLAGE WATERWORKS | | 15,985 | Not detected |
| SARDIS WATER ASSOCIATION | | 15,660 | Not detected |
| BATESVILLE WATER UTILITIES | | 15,621 | Not detected |
| GRAND PRAIRIE REGIONAL WATER | | 15,204 | Not detected |
| MALVERN WATERWORKS | | 14,410 | Not detected |
| HEBER SPRINGS WATER SYSTEM | | 14,015 | Not detected |
| GRAND PRAIRIE BAYOU 2 PWA | | 13,519 | Not detected |
| CAMDEN WATERWORKS | | 13,275 | Not detected |
| MARION WATERWORKS | | 13,032 | Not detected |
| BLYTHEVILLE WATERWORKS | | 12,981 | Not detected |
| GREENBRIER WATERWORKS | | 12,938 | Not detected |
| PEA RIDGE WATERWORKS | | 12,795 | Not detected |
| KIMZEY REGIONAL WATER DISTRICT | | 12,718 | Not detected |
| WARD WATERWORKS | | 12,579 | Not detected |
| SW WHITE COUNTY WATER ASSN | | 12,173 | Not detected |
| ARKADELPHIA WATERWORKS | | 11,855 | Not detected |
| MAGNOLIA WATERWORKS | | 11,657 | Not detected |
| JAMES FORK REGIONAL WATER DISTRICT | | 11,538 | Not detected |
| HOPE WATER LIGHT COMM | | 11,500 | Not detected |
| MADISON CO WATER FACILITIES BD | | 11,435 | Not detected |
| MID-ARKANSAS UTILITIES P.W.A | | 11,148 | Not detected |
| CLINTON WATERWORKS | | 10,280 | Not detected |
| TRUMANN WATERWORKS | | 10,000 | Not detected |
| FORREST CITY WATERWORKS | | 9,986 | Not detected |
| GREENWOOD WATERWORKS | | 9,905 | Not detected |
| PRAIRIE GROVE WATERWORKS | | 9,615 | Not detected |
| SOUTHWEST WATER USERS LLC | | 9,573 | Not detected |
| CLARKSVILLE CONNECTED UTILITIES | | 9,410 | Not detected |
| MOUNTAIN TOP WATER ASSOCIATION | | 9,253 | Not detected |
| SOUTHSIDE PUB WATER AUTHORITY | | 9,108 | Not detected |
| CROSS COUNTY RURAL WATER SYS | | 8,750 | Not detected |
| US AIR FORCE BASE LITTLE ROCK | | 8,618 | Not detected |
| CEDARVILLE WATERWORKS FBCC | | 8,529 | Not detected |
| BEEBE WATERWORKS | | 8,451 | Not detected |
| MONTICELLO WATER DEPARTMENT | | 8,442 | Not detected |
| WYNNE WATERWORKS | | 8,391 | Not detected |
| N GARLAND CO REG WATER DIST | | 7,913 | Not detected |
| GENTRY WATERWORKS | | 7,910 | Not detected |
| CROSSETT WATER COMMISSION | | 7,900 | Not detected |
| POCAHONTAS WATERWORKS | | 7,752 | Not detected |
| LAWRENCE CO REG WATER DIST | | 7,469 | Not detected |
| STUTTGART WATERWORKS | | 7,393 | Not detected |
| MAYFLOWER WATERWORKS | | 7,390 | Not detected |
| YORKTOWN WATER ASSOCIATION | | 7,364 | Not detected |
| TONTITOWN WATERWORKS | | 7,355 | Not detected |
| NASHVILLE RURAL WATER AUTHORITY | | 7,291 | Not detected |
| NE YELL COUNTY WATER ASSOC | | 7,198 | Not detected |
| HWY 63 WATER ASSOCIATION | | 7,187 | Not detected |
| WESTERN GREENE COUNTY R W D | | 7,095 | Not detected |
| BERRYVILLE WATERWORKS | | 6,813 | Not detected |
| BENTON COUNTY WATER DISTRICT #1 | | 6,730 | Not detected |
| LINCOLN WATERWORKS | | 6,690 | Not detected |
| TUMBLING SHOALS WATER ASSOC | | 6,608 | Not detected |
| DUMAS WATERWORKS | | 6,338 | Not detected |
| MOUNT OLIVE WATER ASSOCIATION | | 6,308 | Not detected |
| HWY 71 WATER DISTRICT #1 PWA | | 6,275 | Not detected |
| GREEN FOREST WATERWORKS | | 6,265 | Not detected |
| NEWPORT WATERWORKS | | 6,204 | Not detected |
| MOUNTAIN VIEW WATERWORKS | | 6,153 | Not detected |
| ALMA WATERWORKS | | 6,123 | Not detected |
| DEQUEEN WATER WORK | | 6,105 | Not detected |
| OSCEOLA WATERWORKS | | 6,053 | Not detected |
| WARREN WATERWORKS | | 6,001 | Not detected |
| EAST END WATER | | 5,954 | Not detected |
| WALNUT RIDGE WATERWORKS | | 5,823 | Not detected |
| BARLING WATERWORKS | | 5,822 | Not detected |
| HORSEHEAD WATER ASSOCIATION | | 5,792 | Not detected |
| WEST HELENA WATER WORKS | | 5,693 | Not detected |