| LAKELAND SERVICES | | 63 | 0.2429 mg/L |
| CITY OF SAN DIEGO GLOSSBRENNER UNIT | | 545 | 0.1834 mg/L |
| SUNDANCE ADDITION | | 834 | 0.1420 mg/L |
| BRANDI ESTATES | | 93 | 0.1286 mg/L |
| TEXAS BOYS RANCH | | 59 | 0.1122 mg/L |
| SHULER POINT WATER SYSTEM | | 33 | 0.1070 mg/L |
| PARKER COUNTY SUD GROUND WATER | | 475 | 0.0998 mg/L |
| SNUG HARBOR SUBDIVISION | | 135 | 0.0938 mg/L |
| AMON G CARTER LAKE WSC | | 750 | 0.0936 mg/L |
| SANFORD MUNICIPAL WATER SYSTEM | | 120 | 0.0892 mg/L |
| E CASS WATER SUPPLY CORP | | 150 | 0.0886 mg/L |
| SIENNA REGIONAL MUD | | 0 | 0.0806 mg/L |
| K LAKE TERRACE | | 54 | 0.0800 mg/L |
| NAMELESS HOLLOW CONDOMINIUMS | | 210 | 0.0740 mg/L |
| TEX VILLA APARTMENTS | | 180 | 0.0723 mg/L |
| HIGHLAND LAKES | | 180 | 0.0670 mg/L |
| WESTMONT MOBILE HOME COMMUNITY | | 309 | 0.0634 mg/L |
| TENNESSEE WSC | | 371 | 0.0587 mg/L |
| RIVER RUN WATER SYSTEM | | 48 | 0.0566 mg/L |
| MONTGOMERY COUNTY MUD 159 | | 207 | 0.0560 mg/L |
| LAGO VISTA WATER SYSTEM | | 72 | 0.0464 mg/L |
| BRAZORIA COUNTY MUD 57 MCCOY PARKWAY | | 255 | 0.0457 mg/L |
| WILLOW SPRINGS ADDITION | | 198 | 0.0385 mg/L |
| RIVER CLUB WATER | | 273 | 0.0382 mg/L |
| FORT BEND COUNTY MUD 253 | | 420 | 0.0368 mg/L |
| BROWNS POOL AND PARK | | 50 | 0.0360 mg/L |
| CHOCTAW SUBDIVISION | | 78 | 0.0350 mg/L |
| BEAVER CREEK WCID 1 | | 1,407 | 0.0343 mg/L |
| JACKRABBIT ROAD PUD | | 8,346 | 0.0343 mg/L |
| BENDER CREEK APARTMENTS | | 330 | 0.0340 mg/L |
| RRA SOUTHWEST QUANAH WATER SYSTEM | | 123 | 0.0338 mg/L |
| TEN WEST RANCHES | | 126 | 0.0336 mg/L |
| CITY OF HICO | | 1,379 | 0.0331 mg/L |
| JBSA SAM HOUSTON | | 37,563 | 0.0322 mg/L |
| BLUE MOUND ESTATES | | 111 | 0.0314 mg/L |
| IS ZEN CENTER LOTUS LAKE | | 160 | 0.0311 mg/L |
| KENDALL POINTE | | 342 | 0.0300 mg/L |
| TEXAS WATER SUPPLY | | 221 | 0.0300 mg/L |
| CITY OF ZAVALLA | | 880 | 0.0299 mg/L |
| MAY WSC | | 363 | 0.0294 mg/L |
| DELYNN WATER SYSTEM | | 55 | 0.0293 mg/L |
| FORT INGE MOBILE HOME PARK | | 27 | 0.0292 mg/L |
| RED CREEK MUD | | 897 | 0.0288 mg/L |
| BRIARCREEK SUBDIVISION | | 3,075 | 0.0285 mg/L |
| BLACKS FERRY WATER | | 72 | 0.0283 mg/L |
| INTERSTATE MUD | | 6,591 | 0.0283 mg/L |
| MINK BRANCH VALLEY | | 150 | 0.0280 mg/L |
| GRAND CASTLE ESTATES | | 80 | 0.0279 mg/L |
| LOLLIPOP WATER WORKS | | 267 | 0.0278 mg/L |
| RRA NEWLIN WATER SYSTEM | | 60 | 0.0277 mg/L |
| KLONDIKE ISD | | 311 | 0.0276 mg/L |
| EMERALD ESTATES | | 49 | 0.0271 mg/L |
| COUSHATTE CAMPGROUND | | 250 | 0.0269 mg/L |
| ROANS PRAIRIE | | 40 | 0.0268 mg/L |
| SOLAR VILLAGE HOA | | 40 | 0.0266 mg/L |
| ROMAN FOREST PUD 4 | | 60 | 0.0264 mg/L |
| CITY OF RICHLAND SPRINGS | | 325 | 0.0263 mg/L |
| LAKESIDE WATER SUPPLY 1 | | 132 | 0.0263 mg/L |
| GUN & ROD ESTATES | | 219 | 0.0263 mg/L |
| TEXLINE MUNICIPAL WATER SYSTEM | | 448 | 0.0262 mg/L |
| LLANO GRANDE LAKE PARK WEST | | 300 | 0.0262 mg/L |
| EAST MONTGOMERY COUNTY MUD 3 | | 2,250 | 0.0261 mg/L |
| WESTBROOK ISD | | 54 | 0.0257 mg/L |
| BIG THICKET RV PARK | | 102 | 0.0256 mg/L |
| LAKESIDE WATER SUPPLY 3 | | 123 | 0.0254 mg/L |
| RRA FARMERS VALLEY WATER SYSTEM | | 156 | 0.0252 mg/L |
| RAYLAKE WSC | | 63 | 0.0252 mg/L |
| COUNTRY LAKES WATER SUPPLY | | 144 | 0.0252 mg/L |
| LAKESIDE WATER SUPPLY 4 | | 123 | 0.0248 mg/L |
| CITY OF DOMINO | | 318 | 0.0246 mg/L |
| TOWER WOODS | | 108 | 0.0242 mg/L |
| CITY OF BURTON | | 315 | 0.0240 mg/L |
| HHSC MEXIA STATE SUPPORTED LIVING CENTER | | 256 | 0.0237 mg/L |
| PARKLAND ESTATES | | 228 | 0.0236 mg/L |
| HOUSE CORRAL STREET WATER SYSTEM | | 42 | 0.0235 mg/L |
| RADECKE ROAD WATER SYSTEM | | 42 | 0.0234 mg/L |
| FORT BEND COUNTY MUD 165 | | 4,314 | 0.0232 mg/L |
| WHEELER MUNICIPAL WATER SYSTEM | | 1,602 | 0.0231 mg/L |
| CONCHO RURAL WATER PECAN CREEK | | 1,275 | 0.0229 mg/L |
| VISTA DEL RIO | | 126 | 0.0229 mg/L |
| ESPANTOSA WATER SUPPLY | | 210 | 0.0227 mg/L |
| SADDLE & SURREY ACRES WSC | | 54 | 0.0224 mg/L |
| OAKS MOBILE HOME PARK | | 75 | 0.0222 mg/L |
| NEW DANVILLE COMMUNITY | | 159 | 0.0222 mg/L |
| BARKER CYPRESS MUD | | 8,976 | 0.0221 mg/L |
| WALLER COUNTY MUD 41 | | 594 | 0.0219 mg/L |
| WHITE OAK HILLS | | 315 | 0.0218 mg/L |
| CITY OF RANGER | | 2,629 | 0.0218 mg/L |
| COMMODORE COVE IMPROVEMENT DISTRICT | | 356 | 0.0217 mg/L |
| CITY OF RULE | | 948 | 0.0216 mg/L |
| ROLLING HILLS WATER SERVICE | | 252 | 0.0216 mg/L |
| BOLING RANCH ESTATES | | 462 | 0.0215 mg/L |
| STERLING ESTATES | | 93 | 0.0215 mg/L |
| GOODFELLOW AIR FORCE BASE | | 5,241 | 0.0215 mg/L |
| NORTH GREEN MUD | | 4,941 | 0.0211 mg/L |
| OAK HILL FWSD 1 | | 445 | 0.0210 mg/L |
| BOLIVAR PENINSULA SUD | | 18,424 | 0.0210 mg/L |
| CITY OF LAMPASAS | | 7,291 | 0.0209 mg/L |
| TWIN LAKES WATER | | 85 | 0.0208 mg/L |
| LEANING OAK MOBILE HOME PARK | | 105 | 0.0204 mg/L |