| 1 | City of Jackson Jackson, MS | Jackson, MS | 100 | 13 | 101 | F |
| 2 | Shreveport Water System Shreveport, LA | Shreveport, LA | 76 | 25 | 57 | F |
| 3 | Newark Water Department Newark, NJ | Newark, NJ | 22 | 11 | 101 | F |
| 4 | Springfield Water and Sewer Commission Springfield, MA | Springfield, MA | 27 | 0 | 11 | F |
| 5 | Tuscaloosa Water & Sewer Tuscaloosa, AL | Tuscaloosa, AL | 6 | 5 | 16 | F |
| 6 | Sioux City Water Supply Sioux City, IA | Sioux City, IA | 10 | 0 | 28 | F |
| 7 | Atlanta Atlanta, GA | Atlanta, GA | 5 | 5 | 20 | F |
| 8 | Mobile, Bd. Of W&s Comm. Of the City Of Mobile, AL | Mobile, AL | 4 | 4 | 15 | F |
| 9 | Bjw&sa (0720003) Okatie, SC | Okatie, SC | 4 | 4 | 8 | F |
| 10 | Columbus Public Water System Columbus, OH | Columbus, OH | 3 | 3 | 4 | F |
| 11 | Las Cruces Municipal Water System Las Cruces, NM | Las Cruces, NM | 6 | 0 | 27 | F |
| 12 | Kearney, City Of Kearney, NE | Kearney, NE | 3 | 3 | 5 | F |
| 13 | Liberty Utilities New York - Lynbrook Merrick, NY | Merrick, NY | 6 | 0 | 10 | F |
| 14 | Papillion, City Of Papillion, NE | Papillion, NE | 3 | 3 | 11 | F |
| 15 | Columbia City of (sc4010001) Columbia, SC | Columbia, SC | 3 | 2 | 21 | F |
| 16 | Gilbert, Town Of Gilbert, AZ | Gilbert, AZ | 3 | 2 | 101 | F |
| 17 | Clermont Public Water System Batavia, OH | Batavia, OH | 2 | 2 | 12 | F |
| 18 | City of Baltimore Baltimore, MD | Baltimore, MD | 3 | 1 | 38 | F |
| 19 | Kalamazoo Kalamazoo, MI | Kalamazoo, MI | 4 | 0 | 18 | F |
| 20 | Lowell Regional Water Utility Lowell, MA | Lowell, MA | 3 | 0 | 4 | F |
| 21 | Fort Wayne - 3 Rivers Filtration Plant Fort Wayne, IN | Fort Wayne, IN | 3 | 0 | 7 | F |
| 22 | Glen Burnie-Broadneck Millersville, MD | Millersville, MD | 1 | 1 | 12 | D |
| 23 | Chandler City Of Chandler, AZ | Chandler, AZ | 1 | 1 | 77 | D |
| 24 | Topeka, City Of Topeka, KS | Topeka, KS | 1 | 1 | 12 | D |
| 25 | Phoenix City Of Phoenix, AZ | Phoenix, AZ | 2 | 0 | 12 | D |
| 26 | Des Moines Water Works Des Moines, IA | Des Moines, IA | 2 | 0 | 10 | D |
| 27 | Aqua Pa Main System Bryn Mawr, PA | Bryn Mawr, PA | 2 | 0 | 40 | F |
| 28 | Roswell Municipal Water System Roswell, NM | Roswell, NM | 2 | 0 | 11 | F |
| 29 | New Orleans Carrollton Water Works New Orleans, LA | New Orleans, LA | 2 | 0 | 27 | F |
| 30 | Salt Lake City Water System Salt Lake City, UT | Salt Lake City, UT | 2 | 0 | 15 | F |
| 31 | Boston Water and Sewer Commission (mwra) Boston, MA | Boston, MA | 1 | 0 | 1 | B |
| 32 | Madison Water Utility Madison, WI | Madison, WI | 1 | 0 | 1 | B |
| 33 | Mcwa Rochester, NY | Rochester, NY | 1 | 0 | 3 | B |
| 34 | Rochester City Rochester, NY | Rochester, NY | 1 | 0 | 3 | B |
| 35 | Portland Water Bureau Portland, OR | Portland, OR | 1 | 0 | 4 | C |
| 36 | Kansas City Pws Kansas City, MO | Kansas City, MO | 1 | 0 | 4 | C |
| 37 | Fort Smith Water Utilities Fort Smith, AR | Fort Smith, AR | 1 | 0 | 4 | C |
| 38 | Veolia Water New Jersey Hackensack Haworth, NJ | Haworth, NJ | 1 | 0 | 12 | C |
| 39 | Cocoa, City Of Cocoa, FL | Cocoa, FL | 1 | 0 | 11 | C |
| 40 | Jersey City Mua Hoboken, NJ | Hoboken, NJ | 1 | 0 | 22 | C |
| 41 | Norman Utilities Authority Norman, OK | Norman, OK | 1 | 0 | 11 | C |
| 42 | Cicero Cicero, IL | Cicero, IL | 1 | 0 | 29 | C |
| 43 | Santa Fe Water System (city Of) Santa Fe, NM | Santa Fe, NM | 1 | 0 | 28 | D |
| 44 | Washington Suburban Sanitary Commission Laurel, MD | Laurel, MD | 0 | 0 | 0 | A |
| 45 | East Bay MUD Oakland, CA | Oakland, CA | 0 | 0 | 0 | A |
| 46 | Dallas Water Utility Dallas, TX | Dallas, TX | 0 | 0 | 0 | A |
| 47 | Charlotte Water Charlotte, NC | Charlotte, NC | 0 | 0 | 0 | A |
| 48 | Mo American St Louis St Charles Counties Chesterfield, MO | Chesterfield, MO | 0 | 0 | 0 | A |
| 49 | Gwinnett Co. Dept. of Water Resources Lawrenceville, GA | Lawrenceville, GA | 0 | 0 | 0 | A |
| 50 | Louisville Water Company Louisville, KY | Louisville, KY | 0 | 0 | 0 | A |