| SEATTLE PUBLIC UTILITIES | | 1,161,961 | 0.0149 mg/L |
| TACOMA WATER DIVISION CITY OF | | 446,170 | 0.0159 mg/L |
| VANCOUVER CITY OF | | 373,047 | 0.0050 mg/L |
| SPOKANE CITY OF | | 346,138 | 0.0070 mg/L |
| BELLEVUE CITY OF | | 321,349 | — |
| ALDERWOOD WATER DISTRICT | | 245,715 | 0.0280 mg/L |
| EVERETT PUBLIC WORKS DEPT. CITY OF | | 215,774 | 0.0112 mg/L |
| KENT WATER DEPARTMENT | | 166,421 | 0.0040 mg/L |
| REDMOND WATER SYSTEM CITY OF | | 163,335 | 0.0057 mg/L |
| CLARK PUBLIC UTILITIES | | 153,526 | 0.0055 mg/L |
| LAKEHAVEN WATER AND SEWER DISTRICT | | 148,809 | 0.0075 mg/L |
| BELLINGHAM-WATER DIVISION CITY OF | | 141,127 | 0.0162 mg/L |
| OLYMPIA CITY OF | | 126,966 | 0.0104 mg/L |
| KENNEWICK CITY OF | | 118,164 | 0.0050 mg/L |
| PASCO WATER DEPARTMENT | | 115,102 | 0.0070 mg/L |
| YAKIMA WATER DIVISION CITY OF | | 112,858 | 0.0048 mg/L |
| SKAGIT COUNTY PUD 1 JUDY RES | | 111,415 | 0.0119 mg/L |
| RENTON CITY OF | | 108,091 | 0.0034 mg/L |
| Auburn City of | | 107,655 | 0.0060 mg/L |
| RICHLAND CITY OF | | 106,499 | 0.0085 mg/L |
| LACEY WATER DEPARTMENT | | 105,178 | 0.0078 mg/L |
| HIGHLINE WATER DISTRICT | | 100,170 | 0.0090 mg/L |
| NORTHSHORE UTILITY DISTRICT | | 99,789 | 0.0353 mg/L |
| PUYALLUP CITY OF | | 94,520 | 0.0075 mg/L |
| MARYSVILLE UTILITIES | | 88,582 | 0.0035 mg/L |
| LAKEWOOD WATER DISTRICT | | 82,425 | 0.0040 mg/L |
| SAMMAMISH PLATEAU WATER & SEWER | | 79,362 | 0.0047 mg/L |
| SOOS CREEK WATER & SEWER DISTRICT | | 74,172 | — |
| BREMERTON CITY OF | | 72,951 | 0.0136 mg/L |
| KIRKLAND CITY OF | | 69,243 | — |
| LYNNWOOD CITY OF | | 68,204 | — |
| SNO PUD 1 - LAKE STEVENS | | 67,710 | 0.0038 mg/L |
| WOODINVILLE WATER DISTRICT | | 66,699 | — |
| SILVER LAKE WATER & SEWER DISTRICT | | 65,033 | — |
| SOUTHWOOD | | 64,155 | 0.0062 mg/L |
| LONGVIEW WATER DEPARTMENT | | 57,617 | 0.0116 mg/L |
| COVINGTON WATER DISTRICT | | 56,172 | 0.0080 mg/L |
| TUMWATER CITY OF | | 51,802 | 0.0120 mg/L |
| KING COUNTY WATER DISTRICT #20 | | 48,469 | — |
| WENATCHEE CITY OF | | 43,690 | 0.0030 mg/L |
| ISSAQUAH WATER SYSTEM | | 43,584 | 0.0044 mg/L |
| BONNEY LAKE WATER DEPARTMENT CITY | | 43,371 | 0.0056 mg/L |
| WALLA WALLA WATER DIVISION | | 42,959 | 0.0050 mg/L |
| NOB HILL WATER ASSOCIATION | | 38,050 | 0.0020 mg/L |
| TUKWILA WATER DEPARTMENT | | 36,298 | — |
| FIRGROVE MUTUAL INC | | 36,168 | 0.0094 mg/L |
| JBLM Lewis | | 35,414 | 0.0020 mg/L |
| SILVERDALE WATER DIST 16 | | 35,163 | 0.0073 mg/L |
| SPANAWAY WATER COMPANY | | 34,506 | 0.0074 mg/L |
| EDMONDS CITY OF | | 34,065 | — |
| PARKLAND LIGHT & WATER COMPANY | | 33,775 | 0.0070 mg/L |
| BOTHELL WATER CITY OF | | 33,643 | — |
| North City Water District | | 32,847 | — |
| MOSES LAKE CITY OF | | 32,428 | 0.0031 mg/L |
| CAMAS MUNICIPAL WATER SEWER SYSTEM | | 31,794 | 0.0070 mg/L |
| Mukilteo Water & Wastewater Distr | | 31,437 | — |
| PULLMAN WATER DEPARTMENT CITY OF | | 31,315 | 0.0135 mg/L |
| MERCER ISLAND CITY OF | | 31,057 | — |
| BATTLE GROUND WATER DEPT CITY OF | | 30,237 | 0.0104 mg/L |
| ARLINGTON CITY OF | | 29,508 | 0.0166 mg/L |
| FIFE DEPT OF PUBLIC WORKS | | 29,091 | 0.0099 mg/L |
| West Sound Utility District #1 | | 28,930 | 0.0080 mg/L |
| CEDAR RIVER WATER & SEWER DISTRICT | | 28,671 | 0.0023 mg/L |
| CENTRALIA PUBLIC WORKS - WATER | | 28,164 | 0.0090 mg/L |
| PORT ANGELES CITY OF | | 28,067 | 0.0060 mg/L |
| WHITWORTH WATER DISTRICT 2 | | 26,883 | 0.0046 mg/L |
| EAST WENATCHEE WATER DISTRICT | | 26,519 | 0.0045 mg/L |
| MOUNTLAKE TERRACE CITY OF | | 26,402 | — |
| ANACORTES CITY OF | | 25,109 | 0.0044 mg/L |
| CROSS VALLEY WATER DISTRICT | | 24,695 | 0.0062 mg/L |
| VERA WATER & POWER | | 24,692 | 0.0060 mg/L |
| NORTH PERRY AVE WATER DISTRICT | | 24,402 | 0.0069 mg/L |
| Lake Meridian Water District | | 24,231 | 0.0037 mg/L |
| OAK HARBOR CITY OF | | 23,675 | 0.0050 mg/L |
| KING COUNTY WATER DISTRICT #49 | | 23,492 | — |
| MONROE WATER SYSTEM | | 23,467 | — |
| ENUMCLAW WATER DEPARTMENT | | 23,276 | 0.0046 mg/L |
| ABERDEEN CITY OF | | 22,867 | 0.0165 mg/L |
| PUD #1 OF ASOTIN COUNTY | | 21,930 | 0.0064 mg/L |
| KING COUNTY WATER DISTRICT #125 | | 21,904 | — |
| WASHINGTON STATE UNIVERSITY | | 21,506 | 0.0145 mg/L |
| WASHOUGAL CITY OF | | 21,441 | 0.0048 mg/L |
| WEST RICHLAND CITY OF | | 21,231 | 0.0075 mg/L |
| RIDGEFIELD PUBLIC WORKS | | 21,225 | 0.0044 mg/L |
| CONSOLIDATED IRRIG DIST 19 SYSTEM 2 | | 21,220 | 0.0038 mg/L |
| ELLENSBURG WATER DEPT | | 20,900 | 0.0066 mg/L |
| SNOQUALMIE WATER | | 20,222 | 0.0050 mg/L |
| KING COUNTY WATER DISTRICT NO 90 | | 20,100 | 0.0038 mg/L |
| LYNDEN WATER DEPARTMENT | | 20,062 | 0.0040 mg/L |
| FERNDALE | | 19,305 | 0.0053 mg/L |
| SUMMIT WATER & SUPPLY CO | | 19,125 | 0.0028 mg/L |
| SPO CO WATER DIST 3 SYS 1 | | 19,035 | 0.0053 mg/L |
| MODERN ELECTRIC WATER CO | | 18,487 | 0.0040 mg/L |
| POULSBO CITY OF | | 18,400 | 0.0050 mg/L |
| OLYMPIC VIEW WATER & SEWER DISTRICT | | 17,784 | 0.0188 mg/L |
| STANWOOD WATER DEPT CITY OF | | 17,586 | 0.0360 mg/L |
| YELM CITY OF | | 17,355 | 0.0040 mg/L |
| SUNNYSIDE CITY OF | | 17,194 | 0.0030 mg/L |
| EASTERN WASHINGTON UNIVERSITY | | 17,108 | 0.0170 mg/L |
| PORT TOWNSEND CITY OF | | 17,053 | 0.0076 mg/L |