| Irondale Water System | Irondale | 10,098 | 0.0594 µg/L |
| Collinsville Water Works | Collinsville | 3,945 | 0.0525 µg/L |
| Gadsden, the Wwsb of the City of | Gadsden | 44,637 | 0.0324 µg/L |
| Grand Bay Water Works Board | Grand Bay | 11,100 | 0.0314 µg/L |
| Sterrett-Vandiver Water System, Inc. | Sterrett | 3,252 | 0.0310 µg/L |
| Colbert County Rural Water System | Tuscumbia | 13,395 | 0.0295 µg/L |
| Wetumpka, the Ww & Sb of the City of | Wetumpka | 10,137 | 0.0290 µg/L |
| Clanton, the Ww & Sb of the City of | Clanton | 13,500 | 0.0280 µg/L |
| Highland Water Authority | Gadsden | 3,963 | 0.0278 µg/L |
| Shelby County Commission-Water Services | Columbiana | 40,101 | 0.0277 µg/L |
| Northeast Etowah County Water Co-Op | Gadsden | 4,275 | 0.0270 µg/L |
| Prattville, the Ww Board of the City of | Prattville | 46,614 | 0.0228 µg/L |
| Greenhill Water & Fire Pro Authority | Florence | 8,214 | 0.0223 µg/L |
| Alabaster Water Department, City of | Alabaster | 40,986 | 0.0210 µg/L |
| West Etowah Water & Fire Pro Authority | Attalla | 6,900 | 0.0210 µg/L |
| Marbury Water System, Inc. | Marbury | 8,670 | 0.0202 µg/L |
| Sheffield Utilities, City of Sheffield | Sheffield | 13,758 | 0.0200 µg/L |
| Tri Community Water System | Millbrook | 11,832 | 0.0190 µg/L |
| Spring Valley Water Authority | Tuscumbia | 5,520 | 0.0190 µg/L |
| Grove Hill Water Works | Grove Hill | 5,280 | 0.0190 µg/L |
| Millbrook Utilities | Millbrook | 5,451 | 0.0181 µg/L |
| Holtville Water System | Deatsville | 12,600 | 0.0180 µg/L |
| Florence Water Department, City of | Florence | 77,766 | 0.0170 µg/L |
| West Lauderdale Co, Water & Fpa | Florence | 15,681 | 0.0170 µg/L |
| Littleville Water Works | Russellville | 3,576 | 0.0170 µg/L |
| Muscle Shoals Utility Board | Muscle Shoals | 22,467 | 0.0168 µg/L |
| Montevallo Water Works & Sewer Board | Montevallo | 10,746 | 0.0167 µg/L |
| Wilcox County Water and Sewer District | Camden | 6,144 | 0.0162 µg/L |
| Loachapoka Water Authority | Loachapoka | 14,964 | 0.0160 µg/L |
| Weaver, City of | Weaver | 7,050 | 0.0153 µg/L |
| Childersburg Water & Sewer Board | Childersburg | 9,777 | 0.0151 µg/L |
| Fairhope, City of | Fairhope | 59,850 | 0.0150 µg/L |
| Pell City, City of | Pell City | 17,586 | 0.0150 µg/L |
| South Marengo Co Water & Fire Pro Auth | Linden | 4,416 | 0.0150 µg/L |
| Southside Water Works and Sewer Board | Southside | 12,327 | 0.0140 µg/L |
| Thomasville Water Works & Sewer Board | Thomasville | 6,897 | 0.0140 µg/L |
| Pine Hill,Town of | Pine Hill | 2,361 | 0.0137 µg/L |
| Rogersville Water Works & Sewer Board | Rogersville | 5,271 | 0.0123 µg/L |
| Auburn, the Ww Board of the City of | Auburn | 74,292 | 0.0120 µg/L |
| Saraland, Bd of W&S Commissioners | Saraland | 13,827 | 0.0120 µg/L |
| Northeast Alabama Water Sewer and Fpd | Fort Payne | 47,070 | 0.0119 µg/L |
| Pelham, City of | Pelham | 38,703 | 0.0116 µg/L |
| Limestone County Water & Sewer Auth. | Athens | 90,900 | 0.0111 µg/L |
| Opelika, Ww Bd. of the City of | Opelika | 56,520 | 0.0110 µg/L |
| Albertville, Municipal Ub of the City of | Albertville | 29,367 | 0.0110 µg/L |
| North Baldwin Utilities | Bay Minette | 28,713 | 0.0110 µg/L |
| Boaz Water & Sewer Board | Boaz | 15,138 | 0.0100 µg/L |
| Chisholm Heights, Water & F P Authority | Florence | 4,881 | 0.0096 µg/L |
| Hawk Pride Mt Water System | Tuscumbia | 4,035 | 0.0092 µg/L |
| Asbury Water System | Albertville | 4,077 | 0.0091 µg/L |
| Huntsville Utilities Water Dept. | Huntsville | 310,107 | 0.0090 µg/L |
| Beulah Utilities District | — | 10,389 | 0.0088 µg/L |
| Phenix City Utilities | Phenix City | 42,267 | 0.0075 µg/L |
| Helena, the Ub of the City of | Helena | 21,300 | 0.0070 µg/L |
| Guntersville Ww & Sb | Guntersville | 13,374 | 0.0068 µg/L |
| Smiths Water & Sewer Authority | Smiths | 33,555 | 0.0063 µg/L |
| Tuscumbia Water Works | Tuscumbia | 14,400 | 0.0063 µg/L |
| Jackson Water Works & Sewer Board | Jackson | 11,715 | 0.0062 µg/L |
| Oxford Water Works & Sewer Board | Oxford | 31,239 | 0.0061 µg/L |
| Bessemer Water Service | Bessemer | 86,091 | 0.0059 µg/L |
| Talladega Water & Sewer Board, City of | Talladega | 20,250 | 0.0059 µg/L |
| Russell County Water Authority | Phenix City | 16,923 | 0.0058 µg/L |
| Union Springs (Utlty Bd of the City Of) | Union Springs | 3,945 | 0.0058 µg/L |
| Warrior River Water Authority | Bessemer | 38,700 | 0.0057 µg/L |
| Sardis City Water Board | Boaz | 5,328 | 0.0056 µg/L |
| Stevenson, Util. Board of the Town of | Stevenson | 4,101 | 0.0056 µg/L |
| Tuskegee, Utilities Board of the City of | Tuskegee | 12,900 | 0.0055 µg/L |
| Centre Water & Sewer Board | Centre | 7,050 | 0.0052 µg/L |
| Madison County Water Department | Huntsville | 119,100 | 0.0050 µg/L |
| Eclectic, Water Works & Sewer Board | Eclectic | 5,094 | 0.0050 µg/L |
| Odenville Utilities Board | Odenville | 26,022 | 0.0049 µg/L |
| Tallassee Water Works | Tallassee | 7,512 | 0.0049 µg/L |
| Harvest-Monrovia W,S, and Fp, Inc. | Harvest | 51,915 | 0.0048 µg/L |
| Macon County Water Authority | Tuskegee | 6,951 | 0.0048 µg/L |
| Belforest Water System | Daphne | 17,268 | 0.0045 µg/L |
| Friendship Water Works | Friendship | 4,425 | 0.0045 µg/L |
| Huguley Water Authority | Huguley | 6,795 | 0.0042 µg/L |
| Springville Water Works | Springville | 6,468 | 0.0041 µg/L |
| Cook Springs Water Authority | Pell City | 4,569 | 0.0040 µg/L |
| Central Alabama Water System | Birmingham | 585,000 | Not detected |
| Mobile, Bd. of W&S Comm. of the City of | Mobile | 279,000 | Not detected |
| Montgomery Ww&Ssb, City of | Montgomery | 276,000 | Not detected |
| Tuscaloosa Water & Sewer | Tuscaloosa | 166,524 | Not detected |
| Dothan Utilities, City of | Dothan | 97,146 | Not detected |
| Decatur, Municipal Ub of | Decatur | 77,103 | Not detected |
| Anniston Alabama, the Wwsb of the City O | Anniston | 56,646 | Not detected |
| Cullman County Water Department | Cullman | 56,628 | Not detected |
| Madison, the W & Ww Board of the City of | Madison | 54,114 | Not detected |
| Foley, Utilities Board of the City of | Foley | 50,919 | Not detected |
| Enterprise, the Wwb of the City of | Enterprise | 48,000 | Not detected |
| Us Army Garrison-Redstone Arsenal | Redstone Arsenal | 44,472 | Not detected |
| Athens,The Water Works Bd of the City of | Athens | 43,431 | Not detected |
| Gulf Shores, the Ub of the City of | Gulf Shores | 40,947 | Not detected |
| Northport Water Works, City of | Northport | 40,551 | Not detected |
| Central Elmore Water & Sewer Authority | Wetumpka | 39,798 | Not detected |
| Arab, Water Works Board of the City of | Arab | 39,795 | Not detected |
| Mobile County Water & Fire Pro Authority | Theodore | 39,573 | Not detected |
| South Alabama Utilities Water System | Citronelle | 39,249 | Not detected |
| Cullman, City of | Cullman | 36,312 | Not detected |
| Trussville, Ub of the City of | Trussville | 36,300 | Not detected |