| PINE RIVER MDCA | NAVAJO DAM | 44 | 0.1162 mg/L |
| YANKEE SPRINGS MEADOWS | | 710 | 0.0792 mg/L |
| MILL CREEK WIA | | 67 | 0.0785 mg/L |
| DILLON TOWN OF | | 3,254 | 0.0660 mg/L |
| RIVERLAND LOT OWNERS ASSOC | | 368 | 0.0595 mg/L |
| PINEWOOD SPRINGS WD | | 745 | 0.0552 mg/L |
| FOUR SEASONS MOBILE HOME PARK | | 600 | 0.0440 mg/L |
| SPRING CANYON WSD | | 2,320 | 0.0390 mg/L |
| NEWELL WARNOCK WA | | 160 | 0.0374 mg/L |
| FT LUPTON CITY OF | | 12,099 | 0.0290 mg/L |
| CONSOLIDATED GLACIER VIEW MEADOWS ASSOC | | 395 | 0.0290 mg/L |
| NORTH CARTER LAKE WD | | 328 | 0.0261 mg/L |
| MEADOW MTN WATER SUPPLY | | 76 | 0.0257 mg/L |
| ROSEWOOD HILLS PROPERTY HOA | | 135 | 0.0247 mg/L |
| SHAWNEE WCA | | 50 | 0.0246 mg/L |
| VALLEY MAINT CORP NO 1 | | 470 | 0.0243 mg/L |
| WOODLAND PARK CITY OF | | 8,500 | 0.0241 mg/L |
| LAPLATA VISTA ESTATES HOA | | 68 | 0.0239 mg/L |
| RYE TOWN OF | | 745 | 0.0230 mg/L |
| BLACK HAWK CITY OF | | 15,167 | 0.0228 mg/L |
| LYONS TOWN OF | | 2,990 | 0.0222 mg/L |
| EMPIRE TOWN OF | | 500 | 0.0218 mg/L |
| GILCREST TOWN OF | | 1,150 | 0.0216 mg/L |
| RAINBOW VALLEY WD | | 130 | 0.0216 mg/L |
| COLUMBINE LAKE WSD | | 428 | 0.0210 mg/L |
| GOLD RUSH WC | | 132 | 0.0200 mg/L |
| ANNUNCIATION HEIGHTS | | 260 | 0.0198 mg/L |
| FRASER TOWN OF | | 2,150 | 0.0196 mg/L |
| FOXRIDGE FARMS MHP | | 1,440 | 0.0194 mg/L |
| FRISCO TOWN OF | | 4,495 | 0.0193 mg/L |
| ARABIAN ACRES MD | | 325 | 0.0192 mg/L |
| DIVIDE MPC MD NO 1 | | 679 | 0.0190 mg/L |
| UPPER SURFACE CREEK DOMESTIC WUA | | 2,800 | 0.0188 mg/L |
| IDAHO SPRINGS CITY OF | | 10,432 | 0.0188 mg/L |
| YMCA ROCKIES WIND RIVER | | 3,730 | 0.0185 mg/L |
| FIRESTONE TOWN OF | | 27,798 | 0.0184 mg/L |
| SHAMBHALA MOUNTAIN CENTER | | 90 | 0.0180 mg/L |
| TANGLEWOOD WS | | 60 | 0.0175 mg/L |
| EXCELL LAWSON VILLAGE | | 90 | 0.0174 mg/L |
| ARAPAHOE CNTY WWWA | | 31,000 | 0.0170 mg/L |
| FRUITLAND DOMESTIC WC | | 335 | 0.0170 mg/L |
| WAYSIDE | | 40 | 0.0162 mg/L |
| ESTES PARK TOWN OF | | 16,722 | 0.0161 mg/L |
| PLATTEVILLE TOWN OF | | 2,900 | 0.0160 mg/L |
| SPRINGRIDGE SUBD | | 237 | 0.0160 mg/L |
| HAMILTON CREEK MD | | 200 | 0.0160 mg/L |
| STONETOWN SPRING OAKS MOBILE HOME PARK | | 450 | 0.0159 mg/L |
| MORAINE PARK WS | | 100 | 0.0158 mg/L |
| WOODLAND PARK AND SALES | | 125 | 0.0157 mg/L |
| PEYTON PINES | | 56 | 0.0152 mg/L |
| BIG ELK MEADOWS WA | | 405 | 0.0150 mg/L |
| BERTHOUD TOWN OF | | 14,211 | 0.0150 mg/L |
| CROWLEY RANCH RESERVE | | 49 | 0.0150 mg/L |
| HOT SULPHUR SPRINGS TOWN OF | | 687 | 0.0149 mg/L |
| JAMESTOWN TOWN OF | | 280 | 0.0146 mg/L |
| KERSEY WD | | 2,101 | 0.0146 mg/L |
| CREEDE CITY OF | | 1,965 | 0.0145 mg/L |
| KEYSTONE RANCH | | 670 | 0.0145 mg/L |
| WILLOWS WD | | 19,000 | 0.0143 mg/L |
| MILE HIGH WC | | 700 | 0.0143 mg/L |
| TELLER COUNTY WSD | | 600 | 0.0142 mg/L |
| CRESTED BUTTE TOWN OF | | 2,440 | 0.0141 mg/L |
| WESTCREEK LAKES WD | | 165 | 0.0140 mg/L |
| THE RINCON WATER COOPERATIVE | CEDAR CREST | 276 | 0.0140 mg/L |
| NEDERLAND TOWN OF | | 2,406 | 0.0140 mg/L |
| RALSTON VALLEY WSD | | 1,610 | 0.0140 mg/L |
| BROOK FOREST WD | | 998 | 0.0140 mg/L |
| BUFFALO CREEK WD | | 125 | 0.0140 mg/L |
| KK WATER ASSOC | | 70 | 0.0140 mg/L |
| MT WERNER WD | | 19,000 | 0.0138 mg/L |
| DILLON VALLEY DISTRICT | | 3,063 | 0.0136 mg/L |
| DURANGO WEST MD NO 2 | | 930 | 0.0135 mg/L |
| WOODY CREEK METROPOLITAN DISTRICT | | 220 | 0.0134 mg/L |
| GRAND COUNTY WATER NO 1 | | 5,400 | 0.0134 mg/L |
| CENTRAL CITY CITY OF | | 3,750 | 0.0133 mg/L |
| SNAKE RIVER WD | | 9,900 | 0.0132 mg/L |
| GRANBY TOWN OF SOUTH SERVICE AREA | | 2,300 | 0.0131 mg/L |
| DEER RUN MOBILE HOME COMMUNITY | MERRILL | 49 | 0.0131 mg/L |
| DENVER WATER BOARD | | 1,287,000 | 0.0130 mg/L |
| SIDNEY PEAK RANCH | | 42 | 0.0129 mg/L |
| MT VERNON COUNTRY CLUB | | 734 | 0.0128 mg/L |
| FREDERICK TOWN OF | | 17,173 | 0.0127 mg/L |
| EVERGREEN LAKE COMPANY | | 431 | 0.0127 mg/L |
| LAST DOLLAR PUD | | 96 | 0.0127 mg/L |
| VALLEY MAINT CORP NO 2 | | 55 | 0.0125 mg/L |
| CONSOLIDATED MUTUAL MAPLE GROVE | | 81,400 | 0.0124 mg/L |
| SUNLIGHT VIEW WWW COMPANY | | 234 | 0.0124 mg/L |
| BRIGHTON CITY OF | | 56,304 | 0.0123 mg/L |
| GRACE MAR WUA | | 50 | 0.0123 mg/L |
| CRESTWOOD ESTATES | | 140 | 0.0123 mg/L |
| BLUE RIVER VALLEY RANCH LAKES | | 150 | 0.0122 mg/L |
| TWO BUTTES TOWN OF | | 64 | 0.0122 mg/L |
| LA JUNTA CITY OF | | 8,320 | 0.0120 mg/L |
| WINTER PARK RANCH WSD | | 3,250 | 0.0120 mg/L |
| GINTERS GROVE DOMESTIC WATER CORP | | 62 | 0.0120 mg/L |
| OAK MEADOWS WATER ASSOCIATION | | 50 | 0.0120 mg/L |
| FRIENDLY VILLAGE OF AURORA MHP | | 1,786 | 0.0119 mg/L |
| COUNTRY ACRES MHP (LA SALLE COUNTY) | | 222 | 0.0118 mg/L |
| NEW DOVER ESTATES | | 100 | 0.0118 mg/L |
| GENESEE WSD | | 3,920 | 0.0117 mg/L |