| SHANIKO WATER SYSTEM | | 38 | 0.0856 mg/L |
| MANNA HOUSE CHURCH | | 300 | 0.0850 mg/L |
| SCOTTS MILLS, CITY OF | | 421 | 0.0820 mg/L |
| SCAPPOOSE, CITY OF | | 8,710 | 0.0618 mg/L |
| JOHNSON CREEK WATER SERVICE | | 0 | 0.0542 mg/L |
| ZIG ZAG WATER CO-OP | | 60 | 0.0505 mg/L |
| SALMON RIVER RV PARK | | 69 | 0.0464 mg/L |
| PORT OF TILLAMOOK BAY | | 250 | 0.0415 mg/L |
| VERNONIA, CITY OF | | 2,100 | 0.0370 mg/L |
| HIGHLINE OAKS WATER UTILITY | | 242 | 0.0353 mg/L |
| ROCKAWAY BEACH, CITY OF | | 1,400 | 0.0342 mg/L |
| NORTH CLACKAMAS COUNTY WC | | 0 | 0.0330 mg/L |
| SHANGRI-LA WATER DISTRICT | | 200 | 0.0323 mg/L |
| FERNHILL COMMUNITY WTR SYSTEM | | 300 | 0.0320 mg/L |
| MANZANITA, CITY OF | | 3,200 | 0.0313 mg/L |
| PRINEVILLE MOBILE HOME PARK | | 130 | 0.0309 mg/L |
| SAND-N-WOOD MOBILE VILLA | | 60 | 0.0301 mg/L |
| LA WATER CO-OP | | 2,500 | 0.0300 mg/L |
| DUNN COURT DUPLEXES | | 88 | 0.0297 mg/L |
| WATFORD CITY MOBILE HOME PARK | | 52 | 0.0291 mg/L |
| HECETA WATER PEOPLES UTILITY DISTRICT | | 4,921 | 0.0284 mg/L |
| DIAMOND LAKE LODGE/RESORT | | 90 | 0.0280 mg/L |
| FERN VALLEY ESTATES IMPR DIST | | 135 | 0.0270 mg/L |
| CORBETT WATER DISTRICT | | 2,954 | 0.0266 mg/L |
| MYRTLE POINT, CITY OF | | 2,656 | 0.0264 mg/L |
| DEER ISLAND WATERWORKS | | 90 | 0.0260 mg/L |
| SEASIDE WATER DEPARTMENT | | 7,482 | 0.0258 mg/L |
| SOUTH FORK WATER BOARD | | 0 | 0.0254 mg/L |
| OCEANSIDE WATER DISTRICT | | 500 | 0.0251 mg/L |
| OREGON CITY | | 33,940 | 0.0251 mg/L |
| WEST LINN, CITY OF | | 28,000 | 0.0250 mg/L |
| CLACKAMAS RIVER WATER - CLAIRMONT | | 19,928 | 0.0250 mg/L |
| LAFAYETTE, CITY OF | | 4,423 | 0.0240 mg/L |
| ELDERBERRY NEHALEM WS | | 160 | 0.0236 mg/L |
| SUNNY ACRES WATER DISTRICT | | 130 | 0.0235 mg/L |
| BROWNSVILLE, CITY OF | | 1,906 | 0.0226 mg/L |
| REEDSPORT, CITY OF | | 4,836 | 0.0224 mg/L |
| MT ANGEL ABBEY | | 150 | 0.0222 mg/L |
| MAPLE ELSIE WATER SERVICE | | 100 | 0.0220 mg/L |
| GEARHART WATER DEPARTMENT | | 1,780 | 0.0218 mg/L |
| GATES, CITY OF | | 220 | 0.0217 mg/L |
| USFS WOLF CREEK JOB CORPS | | 291 | 0.0215 mg/L |
| ASTORIA, CITY OF | | 10,181 | 0.0210 mg/L |
| BETHEL PARK | | 125 | 0.0210 mg/L |
| PASS CREEK RV PARK LLC | | 50 | 0.0210 mg/L |
| PRESCOTT, CITY OF | | 70 | 0.0209 mg/L |
| WEST SLOPE WATER DISTRICT | | 11,000 | 0.0208 mg/L |
| MCKENZIE PALISADES WATER BOARD | | 50 | 0.0204 mg/L |
| SHADY OAKS ESTATES | | 648 | 0.0202 mg/L |
| PORTLAND WATER BUREAU | | 666,200 | 0.0198 mg/L |
| TUALATIN VALLEY WATER DISTRICT | | 224,600 | 0.0194 mg/L |
| DRAIN, CITY OF | | 1,194 | 0.0193 mg/L |
| YACHATS, CITY OF | | 1,006 | 0.0191 mg/L |
| ROCKWOOD PUD | | 65,443 | 0.0190 mg/L |
| TIGARD, CITY OF | | 62,500 | 0.0190 mg/L |
| TUALATIN, CITY OF | | 28,106 | 0.0190 mg/L |
| RALEIGH WATER DISTRICT | | 4,500 | 0.0190 mg/L |
| LAKE GROVE WATER DISTRICT | | 3,100 | 0.0190 mg/L |
| PLEASANT HOME WATER DISTRICT | | 1,510 | 0.0190 mg/L |
| PALATINE HILL WATER DISTRICT | | 1,500 | 0.0190 mg/L |
| VALLEY VIEW WATER DISTRICT | | 1,034 | 0.0190 mg/L |
| GRESHAM, CITY OF | | 73,932 | 0.0188 mg/L |
| ROW RIVER VALLEY WATER DIST | | 340 | 0.0185 mg/L |
| ROBBINS NEST RESIDENTIAL PARK | | 27 | 0.0178 mg/L |
| LAKE OSWEGO MUNICIPAL WATER | | 40,000 | 0.0175 mg/L |
| BURLINGTON WATER DISTRICT | | 340 | 0.0174 mg/L |
| LORNA WATER DISTRICT | | 212 | 0.0174 mg/L |
| OAK LODGE WATER SERVICES | | 30,000 | 0.0174 mg/L |
| LAURELWOOD WATER ASSOC | | 50 | 0.0174 mg/L |
| ALBANY, CITY OF | | 57,997 | 0.0172 mg/L |
| ALDER CREEK BARLOW WATER DIST | | 300 | 0.0172 mg/L |
| SKYVIEW ACRES WATER COMPANY | | 200 | 0.0170 mg/L |
| UNITY, CITY OF | | 40 | 0.0170 mg/L |
| COBBLESTONE MHP | | 100 | 0.0170 mg/L |
| ROCKY POINTE MARINA | | 125 | 0.0169 mg/L |
| SUNSTONE - BEAR CREEK | | 275 | 0.0169 mg/L |
| BIG FOOT MHP | | 60 | 0.0167 mg/L |
| CITY OF STAYTON | | 8,400 | 0.0165 mg/L |
| GARIBALDI WATER SYSTEM | | 837 | 0.0164 mg/L |
| MAGNOLIA MHP | | 75 | 0.0162 mg/L |
| PERIWINKLE MOBILE HOME PARK | | 55 | 0.0161 mg/L |
| POWERS, CITY OF | | 712 | 0.0161 mg/L |
| TILLAMOOK WATER DEPT, CITY OF | | 5,265 | 0.0160 mg/L |
| CHEHALEM VALLEY WATER ASSN | | 75 | 0.0160 mg/L |
| ANTELOPE, CITY OF | | 46 | 0.0160 mg/L |
| LAKEWOOD HOMEOWNERS | | 289 | 0.0156 mg/L |
| MULINO WATER DISTRICT | | 700 | 0.0156 mg/L |
| MAPLETON WATER DISTRICT | | 600 | 0.0156 mg/L |
| GRANDVIEW MOBILE HOME PARK | | 99 | 0.0155 mg/L |
| OR YOUTH AUTHORITY - MACLAREN | | 750 | 0.0154 mg/L |
| COUNTRY ESTATES MOBILE PARK | | 175 | 0.0154 mg/L |
| BREWSTER COMMUNITY HOMEOWNERS | | 70 | 0.0151 mg/L |
| LAKESHORE WATER COMPANY | | 135 | 0.0151 mg/L |
| SPAR TREE MHP | | 26 | 0.0151 mg/L |
| HARRISBURG, CITY OF | | 3,684 | 0.0150 mg/L |
| COLTON WATER DISTRICT | | 1,500 | 0.0150 mg/L |
| TABLE ROCK MOBILE ESTATES (NORTH&SOUTH) | | 150 | 0.0150 mg/L |
| LEISURE PINES MOBILE RANCH | | 50 | 0.0150 mg/L |
| WATSECO-BARVIEW WATER DISTRICT | | 450 | 0.0150 mg/L |
| ST HELENS, CITY OF | | 13,410 | 0.0148 mg/L |