| BRYCE CANYON NATIONAL PARK | | 351 | 0.1354 mg/L |
| Monument Valley Utah Schools | Monument Valley | 700 | 0.0937 mg/L |
| WOODLAND HILLS SUBDIVISION | | 100 | 0.0780 mg/L |
| Monument Valley Mission - Hospital | Monument Valley | 303 | 0.0577 mg/L |
| PACK CREEK WATER COMPANY | | 75 | 0.0400 mg/L |
| WANSHIP WATER CO. LLC | | 79 | 0.0286 mg/L |
| EDEN RANCH WATER COMPANY | | 28 | 0.0261 mg/L |
| COPPERTON IMPROVEMENT DISTRICT | | 990 | 0.0250 mg/L |
| CEDAR HIGHLANDS SUBDIVISION | | 100 | 0.0238 mg/L |
| CANYON MEADOWS MUTUAL WATER COMPANY | | 85 | 0.0224 mg/L |
| WENDOVER CITY WATER SYSTEM | | 1,525 | 0.0222 mg/L |
| GREENDALE WATER COMPANY | | 467 | 0.0220 mg/L |
| CEDAR RIDGE DISTRIBUTION COMPANY | | 100 | 0.0210 mg/L |
| WOODLAND MUTUAL WATER CO | | 190 | 0.0190 mg/L |
| HIDDEN HOLLOW WATER COMPANY | | 99 | 0.0179 mg/L |
| LAKETOWN | | 380 | 0.0176 mg/L |
| SKYLINE MTN SSD | | 271 | 0.0172 mg/L |
| WILDWOOD WATER LLC | | 32 | 0.0170 mg/L |
| PALISADES WATER COMPANY | | 49 | 0.0169 mg/L |
| WOODLAND HILLS CITY | | 1,605 | 0.0158 mg/L |
| SARATOGA SPRINGS CITY | | 68,000 | 0.0152 mg/L |
| COLEMAN MOBILE HOME COURT | | 65 | 0.0150 mg/L |
| EDEN WATERWORKS SYSTEM | | 1,350 | 0.0146 mg/L |
| CHEKSHANI CLIFFS HOA | | 120 | 0.0145 mg/L |
| GLEN CANYON NRA - BULLFROG | | 690 | 0.0143 mg/L |
| HIDDEN CREEK WATER CO | | 109 | 0.0142 mg/L |
| MOUNTAINWEST PIPELINE CLAY BASIN CAMP | | 37 | 0.0142 mg/L |
| TIMBERLINE MHP | SHOW LOW | 350 | 0.0141 mg/L |
| MORONI CITY | | 1,600 | 0.0140 mg/L |
| MARYSVALE TOWN WATER SYSTEM | | 380 | 0.0140 mg/L |
| TRIDELL LAPOINT WID | | 1,525 | 0.0137 mg/L |
| KATHERINE HEIGHTS | BULLHEAD CITY | 415 | 0.0136 mg/L |
| WOODS CROSS CITY WATER SYSTEM | | 13,110 | 0.0135 mg/L |
| SPRINGDALE TOWN WATER SYSTEM | | 529 | 0.0134 mg/L |
| ESCALANTE VALLEY SCHOOL | | 210 | 0.0134 mg/L |
| BEAR LAKE WEST | | 100 | 0.0134 mg/L |
| GARLAND CITY WATER SYSTEM | | 2,400 | 0.0133 mg/L |
| TRENTON TOWN WATER SYSTEM | | 490 | 0.0133 mg/L |
| UNIVERSITY OF UTAH | | 57,080 | 0.0133 mg/L |
| SL COUNTY SERVICE AREA NO 3 - SNOWBIRD | | 5,110 | 0.0130 mg/L |
| NORTH VILLAGE SSD | | 1,280 | 0.0130 mg/L |
| EAST DUCHESNE CULINARY WID | | 1,000 | 0.0130 mg/L |
| CHIEF SLEEP EASY TP | BEAVER DAM | 124 | 0.0130 mg/L |
| ECHO MUTUAL WATER SYSTEM | | 70 | 0.0130 mg/L |
| PEOA PIPELINE COMPANY | | 141 | 0.0126 mg/L |
| WOODENSHOE WATER COMPANY | | 76 | 0.0123 mg/L |
| WILDWOOD ESTATES | | 1,001 | 0.0122 mg/L |
| BOUNDARY SPRING WATER CO | | 150 | 0.0121 mg/L |
| RIVER HEIGHTS CITY | | 2,195 | 0.0120 mg/L |
| SWISS ALPINE WATER CO | | 300 | 0.0120 mg/L |
| NORTH FORK SSD | | 1,480 | 0.0118 mg/L |
| HANNA WATER & SEWER IMPROVEMENT DISTRICT | | 405 | 0.0117 mg/L |
| GREEN HILLS COUNTRY ESTATES | | 237 | 0.0116 mg/L |
| SUMMIT COUNTY SERVICE AREA #3 | | 600 | 0.0116 mg/L |
| ERDA ACRES WATER CO | | 1,150 | 0.0114 mg/L |
| MONA TOWN WATER SYSTEM | | 2,100 | 0.0110 mg/L |
| TIMBER LAKES WATER SSD | | 1,560 | 0.0110 mg/L |
| CAPITOL REEF NATIONAL PARK | | 1,070 | 0.0110 mg/L |
| KWU INC | | 460 | 0.0110 mg/L |
| CLEVELAND WATER SYSTEM | | 509 | 0.0107 mg/L |
| MOUNT AIR SUBDIVISION | | 215 | 0.0106 mg/L |
| PAROWAN CITY WATER SYSTEM | | 3,000 | 0.0104 mg/L |
| ASPEN CREEK WATER COMPANY | | 64 | 0.0104 mg/L |
| DEEP SPRINGS WATER CO | | 75 | 0.0103 mg/L |
| BICKNELL TOWN | | 380 | 0.0102 mg/L |
| PINE MEADOW MUTUAL WATER | | 1,251 | 0.0102 mg/L |
| PAYSON CITY WATER SYSTEM | | 19,000 | 0.0100 mg/L |
| SOUTH DAVIS WATER DISTRICT | | 10,565 | 0.0100 mg/L |
| IVINS | | 10,465 | 0.0100 mg/L |
| PLEASANT VIEW CULINARY WATER | | 9,250 | 0.0100 mg/L |
| NIBLEY CITY WATER | | 9,200 | 0.0100 mg/L |
| BALLARD WATER IMPROVEMENT DISTRICT | | 1,005 | 0.0100 mg/L |
| GOSHEN TOWN WATER SYSTEM | | 925 | 0.0100 mg/L |
| SILVER FORK PIPELINE CORP | | 300 | 0.0100 mg/L |
| DUTCH JOHN TOWN WATER SYSTEM | | 144 | 0.0100 mg/L |
| GUNLOCK SPECIAL SERVICE DISTRICT | | 118 | 0.0100 mg/L |
| FOX HILL MOBILE HOME COMMUNITY | | 60 | 0.0100 mg/L |
| ALTA TOWN WATER SYSTEM | | 5,228 | 0.0099 mg/L |
| SUGARBERRY PLACE | | 864 | 0.0099 mg/L |
| EMIGRATION IMPROVEMENT DISTRICT | | 1,000 | 0.0098 mg/L |
| BUCKEYE TRAILS - L | | 400 | 0.0098 mg/L |
| NEWTON TOWN WATER SYSTEM | | 810 | 0.0098 mg/L |
| SPRING CREEK MHP | KALISPELL | 82 | 0.0097 mg/L |
| CLEARFIELD CITY WATER SYSTEM | | 33,540 | 0.0096 mg/L |
| PETERSON PIPELINE ASSOCIATION | | 495 | 0.0096 mg/L |
| JENSEN WID | | 1,375 | 0.0094 mg/L |
| TOQUERVILLE TOWN WATER SYSTEM | | 1,931 | 0.0094 mg/L |
| HARMONY FARMS WATER USERS | | 314 | 0.0092 mg/L |
| TRAIL CYN RESIDENTS ASSN | | 62 | 0.0092 mg/L |
| CLUFF WARD PIPELINE CO | | 188 | 0.0092 mg/L |
| RAINBOW RANCHOS | | 291 | 0.0090 mg/L |
| TOOELE CITY WATER SYSTEM | | 37,100 | 0.0090 mg/L |
| SPRINGVILLE CITY | | 35,516 | 0.0090 mg/L |
| BLUFFDALE WATER SYSTEM | | 20,000 | 0.0090 mg/L |
| PARK CITY WATER SYSTEM | | 8,875 | 0.0090 mg/L |
| FAIRVIEW CITY WATER SYSTEM | | 2,092 | 0.0090 mg/L |
| WEST CORINNE WATER CO | | 1,970 | 0.0090 mg/L |
| LIBERTY PIPELINE COMPANY | | 1,750 | 0.0090 mg/L |
| HIGHLANDS WATER COMPANY INC | | 1,200 | 0.0090 mg/L |
| EUREKA TOWN | | 760 | 0.0090 mg/L |