Water Quality in Louisiana
917 water systems • 332 cities • EPA SDWIS Data
917
Water Systems
32,039
Total Violations
16,153
Health-Based Violations
5,225,688
Population Served
Overview
Louisiana has 917 active community water systems serving 5,225,688 people. These systems have accumulated 32,039 EPA Safe Drinking Water Act violations on record, of which 16,153 are health-based violations (meaning a contaminant exceeded safe levels).
Common contaminants found in violations: Chlorine Dioxide, E. coli, Disinfection Byproducts, Stage 2 DBP, Nitrate, TTHM, Total Haloacetic Acids (HAA5), Barium, Gross Alpha, Surface Water Treatment.
Cities with Most Violations in Louisiana
| # | City | Violations | Health-Based | Water Systems | Population |
|---|---|---|---|---|---|
| 1 | Des Peres | 1,041 | 324 | 68 | 60,052 |
| 2 | Farmerville | 889 | 628 | 6 | 12,351 |
| 3 | West Monroe | 802 | 611 | 19 | 116,661 |
| 4 | Many | 620 | 412 | 6 | 20,592 |
| 5 | Zwolle | 613 | 524 | 5 | 11,862 |
| 6 | Coushatta | 547 | 273 | 9 | 13,113 |
| 7 | Mansfield | 542 | 294 | 5 | 18,750 |
| 8 | Ferriday | 537 | 416 | 3 | 13,181 |
| 9 | Marion | 487 | 333 | 3 | 3,516 |
| 10 | Mandeville | 477 | 220 | 34 | 64,725 |
Largest Cities in Louisiana
| # | City | Population | Violations | Water Systems |
|---|---|---|---|---|
| 1 | Baton Rouge | 701,552 | 68 | 14 |
| 2 | Jefferson | 415,427 | 8 | 2 |
| 3 | New Orleans | 387,921 | 96 | 4 |
| 4 | Lafayette | 203,419 | 131 | 18 |
| 5 | Shreveport | 202,428 | 322 | 13 |
| 6 | Houma | 128,118 | 24 | 2 |
| 7 | Lake Charles | 120,200 | 286 | 17 |
| 8 | West Monroe | 116,661 | 802 | 19 |
| 9 | Hammond | 101,233 | 76 | 10 |
| 10 | Denham Springs | 99,541 | 30 | 4 |
All Cities in Louisiana
| City | Population | Violations | Health Violations | Contaminants |
|---|---|---|---|---|
| Baton Rouge | 701,552 | 68 | 19 | Stage 2 DBP, TTHM, Total Haloacetic Acids (HAA5) |
| Jefferson | 415,427 | 8 | 5 | Total Haloacetic Acids (HAA5) |
| New Orleans | 387,921 | 96 | 26 | Chlorine Dioxide, Contaminant 2920, Disinfection Byproducts +1 more |
| Lafayette | 203,419 | 131 | 26 | Chlorine Dioxide, E. coli, Stage 2 DBP |
| Shreveport | 202,428 | 322 | 118 | Chlorine Dioxide, Contaminant 1009, Contaminant 2920 +6 more |
| Houma | 128,118 | 24 | 3 | TTHM |
| Lake Charles | 120,200 | 286 | 25 | Chlorine Dioxide, E. coli, Stage 2 DBP |
| West Monroe | 116,661 | 802 | 611 | Chlorine Dioxide, Gross Alpha, Stage 2 DBP +2 more |
| Hammond | 101,233 | 76 | 18 | Chlorine Dioxide, Contaminant 1008, Stage 2 DBP |
| Denham Springs | 99,541 | 30 | 4 | Chlorine Dioxide, Disinfection Byproducts |
| Covington | 83,638 | 183 | 37 | Chlorine Dioxide, Disinfection Byproducts, Stage 2 DBP |
| Lockport | 81,609 | 0 | 0 | |
| Bossier City | 80,181 | 235 | 84 | Chlorine Dioxide, E. coli, Gross Alpha +2 more |
| Alexandria | 69,259 | 377 | 266 | Chlorine Dioxide, Disinfection Byproducts, E. coli +3 more |
| Monroe | 65,313 | 137 | 121 | Chlorine Dioxide, Stage 2 DBP, TTHM +1 more |
| Mandeville | 64,725 | 477 | 220 | Chlorine Dioxide, Disinfection Byproducts, E. coli +4 more |
| Des Peres | 60,052 | 1,041 | 324 | Chlorine Dioxide, Disinfection Byproducts, E. coli +5 more |
| Luling | 52,879 | 2 | 0 | |
| Slidell | 48,083 | 354 | 70 | Chlorine Dioxide, E. coli, Gross Alpha +3 more |
| Laplace | 46,679 | 85 | 49 | Bromate, E. coli, Fecal Coliform +2 more |
| Sulphur | 45,906 | 40 | 6 | Chlorine Dioxide |
| Chalmette | 44,783 | 12 | 6 | Bromate, Total Haloacetic Acids (HAA5) |
| Ruston | 35,200 | 20 | 5 | Chlorine Dioxide, Stage 2 DBP |
| Opelousas | 34,989 | 48 | 16 | Chlorine Dioxide |
| Plaquemine | 32,715 | 80 | 68 | E. coli, Fecal Coliform, Nitrate +2 more |
| Benton | 32,617 | 90 | 49 | Chlorine Dioxide, Disinfection Byproducts, TTHM |
| Belle Chasse | 32,082 | 193 | 162 | Contaminant 2920, TTHM, Total Haloacetic Acids (HAA5) |
| Zachary | 31,869 | 58 | 1 | Chlorine Dioxide |
| Port Allen | 30,651 | 25 | 5 | Gross Alpha, Stage 2 DBP |
| Abbeville | 30,009 | 14 | 6 | TTHM |
| Natchitoches | 27,693 | 18 | 12 | E. coli, Total Haloacetic Acids (HAA5) |
| Maurice | 27,582 | 47 | 30 | Chlorine Dioxide, TTHM |
| Minden | 25,589 | 194 | 25 | Chlorine Dioxide, Disinfection Byproducts, Gross Alpha +1 more |
| Pineville | 25,350 | 12 | 10 | Chlorine Dioxide |
| New Roads | 24,864 | 68 | 11 | Chlorine Dioxide, E. coli, Stage 2 DBP |
| Bastrop | 24,573 | 80 | 37 | Chlorine Dioxide, E. coli, Gross Alpha +1 more |
| Longville | 24,000 | 17 | 0 | |
| Fort Johnson | 22,477 | 3 | 0 | |
| Napoleonville | 21,366 | 27 | 22 | Contaminant 2920, E. coli, Gross Alpha +2 more |
| Ville Platte | 20,972 | 111 | 41 | Chlorine Dioxide, E. coli, Gross Alpha +1 more |
| Many | 20,592 | 620 | 412 | Bromate, Chlorine, Chlorine Dioxide +5 more |
| Tioga | 19,983 | 2 | 0 | |
| Broussard | 19,617 | 50 | 14 | Chlorine Dioxide |
| Youngsville | 18,969 | 49 | 18 | Chlorine Dioxide, Disinfection Byproducts |
| Duson | 18,837 | 61 | 13 | Chlorine Dioxide, E. coli, Stage 2 DBP |
| Mansfield | 18,750 | 542 | 294 | Bromate, Chlorine, Chlorine Dioxide +7 more |
| Marksville | 17,796 | 25 | 8 | Chlorine Dioxide, Contaminant 4109, Stage 2 DBP |
| Gretna | 17,026 | 6 | 0 | |
| Gonzales | 16,875 | 12 | 0 | |
| Blanchard | 16,326 | 19 | 16 | Contaminant 1008, Gross Alpha, Stage 2 DBP |
| Rayne | 15,996 | 35 | 21 | Chlorine Dioxide |
| Walker | 15,813 | 4 | 1 | Stage 2 DBP |
| Morgan City | 14,965 | 19 | 6 | Chlorine Dioxide, Contaminant 2920, E. coli |
| Thibodaux | 14,862 | 17 | 0 | |
| Ethel | 14,829 | 14 | 6 | TTHM |
| Convent | 14,713 | 37 | 14 | E. coli, TTHM |
| Deridder | 14,400 | 4 | 1 | Stage 2 DBP |
| St. Francisville | 14,349 | 31 | 19 | Gross Alpha, Nitrate, Stage 2 DBP |
| Bogalusa | 14,161 | 35 | 12 | Chlorine Dioxide, Stage 2 DBP |
| Jennings | 14,031 | 7 | 4 | Chlorine Dioxide |
| Breaux Bridge | 13,980 | 64 | 29 | Barium, Chlorine Dioxide, E. coli +2 more |
| St. Martinville | 13,974 | 129 | 75 | Barium, Chlorine Dioxide, Contaminant 1006 +3 more |
| Baker | 13,855 | 15 | 5 | TTHM |
| Patterson | 13,835 | 11 | 7 | TTHM |
| Church Point | 13,656 | 14 | 7 | Chlorine Dioxide, E. coli |
| Milton | 13,362 | 121 | 30 | Chlorine Dioxide, E. coli, Stage 2 DBP |
| Livingston | 13,202 | 22 | 0 | |
| Ferriday | 13,181 | 537 | 416 | Chlorine Dioxide, Contaminant 2920, Stage 2 DBP +2 more |
| Coushatta | 13,113 | 547 | 273 | Barium, Bromate, Chlorine Dioxide +5 more |
| Barksdale Afb | 13,000 | 19 | 16 | Gross Alpha |
| Parks | 12,801 | 47 | 18 | Chlorine Dioxide |
| Lake Arthur | 12,486 | 8 | 0 | |
| Farmerville | 12,351 | 889 | 628 | Chlorine Dioxide, E. coli, Stage 2 DBP +1 more |
| Cecilia | 12,249 | 22 | 18 | Chlorine Dioxide, E. coli |
| Albany | 12,144 | 12 | 7 | Chlorine Dioxide |
| Tallulah | 12,132 | 79 | 38 | Chlorine Dioxide, E. coli, TTHM |
| Winnfield | 12,090 | 397 | 349 | Chlorine Dioxide, Gross Alpha, Stage 2 DBP +2 more |
| Deville | 12,078 | 0 | 0 | |
| Donaldsonville | 11,961 | 91 | 47 | Bromate, Chlorine Dioxide, Contaminant 1008 +5 more |
| Zwolle | 11,862 | 613 | 524 | Chlorine Dioxide, E. coli, Gross Alpha +2 more |
| Grambling | 11,849 | 60 | 21 | Chlorine Dioxide, Gross Alpha, Stage 2 DBP |
| Kinder | 11,334 | 41 | 36 | Barium, Chlorine Dioxide, Stage 2 DBP +2 more |
| Boyce | 11,319 | 18 | 1 | Stage 2 DBP |
| Leesville | 11,214 | 46 | 19 | Chlorine Dioxide, Stage 2 DBP |
| Gilbert | 11,001 | 326 | 217 | Barium, Chlorine Dioxide, Disinfection Byproducts +1 more |
| Sunset | 10,737 | 76 | 21 | Chlorine Dioxide, Disinfection Byproducts, Stage 2 DBP |
| Carencro | 10,597 | 13 | 0 | |
| Westlake | 10,198 | 27 | 7 | Chlorine Dioxide, Stage 2 DBP |
| Scott | 10,197 | 23 | 2 | Chlorine Dioxide, Disinfection Byproducts |
| Loreauville | 10,137 | 31 | 22 | Chlorine Dioxide, Stage 2 DBP, TTHM +1 more |
| Greensburg | 10,112 | 19 | 14 | Chlorine Dioxide |
| Welsh | 10,020 | 5 | 1 | Chlorine Dioxide |
| Keithville | 9,987 | 145 | 29 | Chlorine Dioxide, Disinfection Byproducts, E. coli +2 more |
| Lawtell | 9,831 | 19 | 7 | Chlorine Dioxide, E. coli |
| Eunice | 9,804 | 50 | 34 | Chlorine Dioxide, TTHM, Total Haloacetic Acids (HAA5) |
| Charenton | 9,709 | 10 | 10 | TTHM, Total Haloacetic Acids (HAA5) |
| Angie | 9,695 | 201 | 28 | Chlorine Dioxide, E. coli, Stage 2 DBP |
| Oakdale | 9,654 | 67 | 18 | Chlorine Dioxide |
| Leonville | 9,552 | 16 | 8 | Chlorine Dioxide |
| Harrisonburg | 9,435 | 275 | 223 | Chlorine Dioxide, E. coli, Gross Alpha +3 more |
| Jonesboro | 9,408 | 199 | 59 | Chlorine Dioxide, Gross Alpha, Stage 2 DBP +1 more |
| Winnsboro | 9,120 | 31 | 17 | Chlorine Dioxide |
| New Iberia | 8,886 | 66 | 33 | Chlorine Dioxide, E. coli |
| Columbia | 8,787 | 48 | 28 | Chlorine Dioxide, Gross Alpha, TTHM +1 more |
| Franklin | 8,725 | 259 | 168 | Bromate, Contaminant 1008, Contaminant 1009 +4 more |
| Arnaudville | 8,643 | 112 | 76 | Barium, Chlorine Dioxide, Disinfection Byproducts +1 more |
| New Llano | 8,595 | 39 | 23 | Chlorine Dioxide |
| Rayville | 8,547 | 351 | 160 | Barium, Chlorine Dioxide, Disinfection Byproducts +5 more |
| Westwego | 8,534 | 20 | 5 | Stage 2 DBP, Total Haloacetic Acids (HAA5) |
| Natchez | 8,415 | 1 | 0 | |
| Jena | 8,330 | 54 | 27 | Chlorine Dioxide |
| Bernice | 8,310 | 262 | 209 | Chlorine Dioxide, TTHM |
| Egan | 8,193 | 107 | 40 | Chlorine Dioxide, TTHM |
| Crowville | 7,989 | 3 | 2 | Chlorine Dioxide |
| Delhi | 7,947 | 58 | 17 | Chlorine Dioxide, TTHM |
| Homer | 7,946 | 73 | 19 | Chlorine Dioxide, Gross Alpha, Stage 2 DBP |
| Springhill | 7,800 | 4 | 2 | Chlorine Dioxide, Stage 2 DBP |
| Franklinton | 7,696 | 48 | 13 | Chlorine Dioxide, Stage 2 DBP |
| Jeanerette | 7,619 | 28 | 6 | Chlorine Dioxide, Stage 2 DBP |
| Stonewall | 7,608 | 13 | 0 | |
| Centerville | 7,500 | 8 | 3 | TTHM, Total Haloacetic Acids (HAA5) |
| Prairieville | 7,421 | 119 | 8 | Chlorine Dioxide |
| Ponchatoula | 7,371 | 20 | 5 | Chlorine Dioxide |
| Jackson | 7,107 | 67 | 6 | Gross Alpha |
| Basile | 6,978 | 3 | 1 | Chlorine Dioxide |
| Lake Providence | 6,954 | 84 | 54 | Chlorine Dioxide, Disinfection Byproducts, Gross Alpha +1 more |
| Port Barre | 6,825 | 86 | 15 | Chlorine Dioxide, TTHM |
| Oak Grove | 6,681 | 44 | 21 | Chlorine Dioxide, Stage 2 DBP |
| Singer | 6,613 | 1 | 0 | |
| Jonesville | 6,579 | 15 | 3 | Chlorine Dioxide |
| Pollock | 6,552 | 32 | 17 | Chlorine Dioxide, Stage 2 DBP, Total Haloacetic Acids (HAA5) |
| Rosepine | 6,510 | 8 | 1 | Chlorine Dioxide |
| Slagle | 6,363 | 0 | 0 | |
| Angola | 6,362 | 5 | 0 | |
| Vidalia | 6,354 | 10 | 1 | Stage 2 DBP |
| Bunkie | 6,222 | 51 | 25 | Chlorine Dioxide, E. coli, Stage 2 DBP +1 more |
| Berwick | 5,898 | 10 | 6 | Contaminant 1009, E. coli, Stage 2 DBP |
| Anacoco | 5,871 | 12 | 2 | Disinfection Byproducts |
| Oberlin | 5,760 | 40 | 19 | Barium, Chlorine Dioxide, TTHM |
| Choudrant | 5,760 | 95 | 50 | Chlorine Dioxide, TTHM |
| Kaplan | 5,570 | 63 | 42 | Chlorine Dioxide, Stage 2 DBP, TTHM +1 more |
| Haughton | 5,514 | 32 | 25 | Chlorine Dioxide, Stage 2 DBP |
| Amite | 5,494 | 34 | 8 | Chlorine Dioxide |
| Bently | 5,289 | 5 | 0 | |
| Monterey | 5,250 | 6 | 2 | Chlorine Dioxide |
| Greenwood | 5,205 | 26 | 22 | Bromate, E. coli, TTHM +1 more |
| St Joseph | 5,175 | 110 | 56 | Chlorine Dioxide, E. coli, Fecal Coliform +3 more |
| Turkey Creek | 5,169 | 7 | 0 | |
| Bell City | 5,127 | 22 | 18 | TTHM |
| Vinton | 5,043 | 9 | 1 | Chlorine Dioxide |
| Ringgold | 4,911 | 235 | 140 | Chlorine Dioxide, Disinfection Byproducts, TTHM +1 more |
| Downsville | 4,857 | 269 | 183 | Chlorine Dioxide, TTHM, Total Haloacetic Acids (HAA5) |
| Woodworth | 4,818 | 6 | 0 | |
| Dequincy | 4,791 | 0 | 0 | |
| Lutcher | 4,781 | 15 | 12 | Bromate, TTHM, Total Haloacetic Acids (HAA5) |
| Athens | 4,704 | 17 | 2 | Gross Alpha |
| Haynesville | 4,692 | 39 | 5 | Chlorine Dioxide, Stage 2 DBP |
| Mamou | 4,559 | 75 | 63 | TTHM, Total Haloacetic Acids (HAA5) |
| Grayson | 4,476 | 179 | 120 | Chlorine Dioxide, E. coli, Gross Alpha +3 more |
| Glenmora | 4,469 | 35 | 14 | Chlorine Dioxide |
| Arcadia | 4,456 | 45 | 15 | Chlorine Dioxide, Disinfection Byproducts, Stage 2 DBP |
| Keatchie | 4,434 | 115 | 53 | Chlorine Dioxide, Gross Alpha, Stage 2 DBP +1 more |
| Plaucheville | 4,233 | 7 | 0 | |
| Dubach | 4,218 | 259 | 198 | TTHM, Total Haloacetic Acids (HAA5) |
| Archibald | 4,200 | 12 | 0 | |
| Vivian | 4,050 | 13 | 11 | Total Haloacetic Acids (HAA5) |
| Iowa | 3,924 | 7 | 1 | Stage 2 DBP |
| Bordelonville | 3,900 | 1 | 1 | Stage 2 DBP |
| Doyline | 3,897 | 227 | 52 | Chlorine Dioxide, Disinfection Byproducts, E. coli +2 more |
| Colfax | 3,896 | 33 | 23 | Chlorine Dioxide |
| Effie | 3,726 | 5 | 2 | Chlorine Dioxide |
| Abita Springs | 3,693 | 5 | 1 | Chlorine Dioxide |
| Calhoun | 3,633 | 72 | 54 | Chlorine Dioxide, TTHM, Total Haloacetic Acids (HAA5) |
| Forest Hill | 3,600 | 1 | 0 | |
| Reeves | 3,582 | 26 | 24 | TTHM |
| Pearl River | 3,567 | 6 | 0 | |
| Sarepta | 3,546 | 40 | 14 | Chlorine Dioxide, Stage 2 DBP, TTHM |
| Lena | 3,540 | 3 | 3 | Chlorine Dioxide, Stage 2 DBP |
| Marion | 3,516 | 487 | 333 | Chlorine Dioxide, Stage 2 DBP, TTHM +1 more |
| Simsboro | 3,513 | 16 | 3 | Chlorine Dioxide |
| Kilbourne | 3,507 | 58 | 20 | Chlorine Dioxide |
| Quitman | 3,438 | 66 | 29 | Chlorine Dioxide |
| Dry Prong | 3,405 | 46 | 17 | Chlorine Dioxide, Disinfection Byproducts, E. coli +1 more |
| Alanta | 3,324 | 25 | 8 | Chlorine Dioxide, Stage 2 DBP |
| Maringouin | 3,300 | 3 | 1 | Stage 2 DBP |
| Hessmer | 3,246 | 6 | 4 | Chlorine Dioxide, Stage 2 DBP |
| Trout | 3,240 | 10 | 6 | Chlorine Dioxide, Disinfection Byproducts |
| Independence | 3,227 | 38 | 6 | Chlorine Dioxide |
| Starks | 3,150 | 11 | 0 | |
| Elmer | 3,135 | 2 | 2 | Chlorine Dioxide |
| Cottonport | 3,120 | 15 | 12 | Chlorine Dioxide, Stage 2 DBP, TTHM |
| Olla | 3,105 | 86 | 57 | Stage 2 DBP, TTHM |
| Erath | 2,973 | 12 | 0 | |
| Campti | 2,970 | 286 | 217 | Chlorine Dioxide, Stage 2 DBP, TTHM +1 more |
| Saline | 2,901 | 439 | 163 | Chlorine Dioxide, Disinfection Byproducts, E. coli +3 more |
| Gramercy | 2,860 | 12 | 9 | TTHM, Total Haloacetic Acids (HAA5) |
| Amelia | 2,823 | 13 | 3 | E. coli, Stage 2 DBP, Total Haloacetic Acids (HAA5) |
| Clinton | 2,805 | 10 | 1 | Stage 2 DBP |
| Belmont | 2,805 | 233 | 110 | Chlorine Dioxide, TTHM |
| Merryville | 2,772 | 18 | 3 | Chlorine Dioxide |
| Mer Rouge | 2,754 | 8 | 2 | TTHM |
| Provencal | 2,751 | 368 | 268 | Chlorine Dioxide, E. coli, TTHM +1 more |
| Hornbeck | 2,715 | 1 | 0 | |
| Castor | 2,685 | 237 | 184 | Chlorine Dioxide, E. coli, TTHM +1 more |
| Krotz Springs | 2,649 | 19 | 0 | |
| Plain Dealing | 2,640 | 252 | 184 | Chlorine Dioxide, E. coli, Stage 2 DBP +2 more |
| Mansura | 2,619 | 1 | 0 | |
| Pine Praire | 2,598 | 8 | 4 | Chlorine Dioxide |
| Cankton | 2,598 | 11 | 5 | Chlorine Dioxide, TTHM |
| White Castle | 2,550 | 20 | 11 | Chlorine Dioxide, Stage 2 DBP |
| Start | 2,514 | 3 | 0 | |
| Delcambre | 2,457 | 23 | 5 | Chlorine Dioxide |
| Logansport | 2,448 | 57 | 47 | Bromate, E. coli, TTHM +1 more |
| Innis | 2,400 | 4 | 0 | |
| Sibley | 2,367 | 45 | 12 | Chlorine Dioxide, E. coli, Stage 2 DBP |
| Chatham | 2,337 | 107 | 80 | Chlorine Dioxide, Gross Alpha, TTHM +1 more |
| Madisonville | 2,325 | 51 | 8 | Chlorine Dioxide |
| Shongaloo | 2,295 | 18 | 0 | |
| Kentwood | 2,265 | 171 | 29 | Chlorine Dioxide, Stage 2 DBP |
| Evergreen | 2,205 | 5 | 1 | Chlorine Dioxide |
| Pioneer | 2,190 | 4 | 1 | Chlorine Dioxide |
| Palmetto | 2,178 | 81 | 61 | Chlorine Dioxide, E. coli, Stage 2 DBP +1 more |
| Oil City | 2,148 | 310 | 246 | Contaminant 2920, E. coli, Fecal Coliform +3 more |
| Simmesport | 2,142 | 13 | 7 | Chlorine Dioxide, Stage 2 DBP, TTHM |
| Sicily Island | 2,070 | 41 | 13 | Chlorine Dioxide, Stage 2 DBP |
| Gueydan | 2,016 | 58 | 17 | Chlorine Dioxide, Disinfection Byproducts, Stage 2 DBP |
| Folsom | 1,992 | 14 | 3 | Chlorine Dioxide |
| Heflin | 1,944 | 42 | 5 | Chlorine Dioxide, E. coli, Stage 2 DBP |
| Slaughter | 1,920 | 5 | 0 | |
| Iota | 1,842 | 38 | 22 | Chlorine Dioxide |
| Converse | 1,821 | 255 | 205 | Chlorine Dioxide, TTHM, Total Haloacetic Acids (HAA5) |
| Cameron | 1,798 | 60 | 60 | TTHM |
| Grant | 1,761 | 12 | 0 | |
| Elm Grove | 1,755 | 25 | 12 | Chlorine Dioxide, E. coli, Gross Alpha +1 more |
| Dubberly | 1,734 | 6 | 1 | Chlorine Dioxide |
| Moureauville | 1,725 | 11 | 0 | |
| Washington | 1,713 | 16 | 9 | Chlorine Dioxide |
| Montgomery | 1,698 | 84 | 24 | Chlorine Dioxide, Disinfection Byproducts, E. coli +2 more |
| Grand Coteau | 1,650 | 40 | 17 | Chlorine Dioxide, Stage 2 DBP |
| Clayton | 1,623 | 151 | 128 | Chlorine Dioxide, E. coli, TTHM |
| Loranger | 1,596 | 141 | 22 | Chlorine Dioxide |
| Morrow | 1,572 | 0 | 0 | |
| Forest | 1,560 | 1 | 1 | Stage 2 DBP |
| Cheneyville | 1,531 | 25 | 9 | Chlorine Dioxide, Stage 2 DBP |
| Roseland | 1,521 | 28 | 21 | Chlorine Dioxide |
| Elton | 1,512 | 36 | 10 | Chlorine Dioxide, Gross Alpha, TTHM |
| Johnson Bayou | 1,509 | 0 | 0 | |
| Melville | 1,506 | 103 | 16 | Chlorine Dioxide, E. coli, Stage 2 DBP |
| Junction City | 1,446 | 77 | 46 | Chlorine Dioxide, TTHM |
| Collinston | 1,389 | 62 | 16 | Chlorine Dioxide, Disinfection Byproducts, Stage 2 DBP |
| Hodge | 1,388 | 235 | 44 | Chlorine Dioxide, Gross Alpha, Nitrate +1 more |
| Fordoche | 1,380 | 3 | 2 | Chlorine Dioxide, Stage 2 DBP |
| Cotton Valley | 1,380 | 45 | 5 | Chlorine Dioxide |
| Dodson | 1,374 | 154 | 87 | Chlorine Dioxide, TTHM, Total Haloacetic Acids (HAA5) |
| Grand Junction | 1,350 | 0 | 0 | |
| Summerfield | 1,329 | 1 | 0 | |
| Kelly | 1,314 | 1 | 0 | |
| Cullen | 1,236 | 74 | 12 | Chlorine Dioxide, Stage 2 DBP, TTHM |
| Livonia | 1,234 | 2 | 0 | |
| Wisner | 1,221 | 36 | 14 | Chlorine Dioxide, Stage 2 DBP |
| Gibsland | 1,204 | 66 | 15 | Chlorine Dioxide, Disinfection Byproducts, E. coli +1 more |
| Pelican | 1,161 | 7 | 0 | |
| Bienville | 1,131 | 129 | 30 | Chlorine Dioxide, Disinfection Byproducts, E. coli +1 more |
| Bonita | 1,122 | 274 | 223 | Chlorine Dioxide, Stage 2 DBP, TTHM +1 more |
| Transylvania | 1,116 | 111 | 41 | Chlorine Dioxide, Disinfection Byproducts, Stage 2 DBP +1 more |
| Simpson | 1,116 | 10 | 2 | Chlorine Dioxide |
| Mount Hermon | 1,107 | 8 | 4 | Chlorine Dioxide, Stage 2 DBP |
| Newellton | 1,100 | 305 | 164 | Bromate, Contaminant 2920, E. coli +3 more |
| Sterlington | 1,095 | 90 | 83 | Chlorine Dioxide, TTHM |
| Hineston | 1,089 | 4 | 1 | Chlorine Dioxide |
| Eros | 1,047 | 200 | 120 | Chlorine Dioxide, TTHM |
| Echo | 1,044 | 11 | 2 | Chlorine Dioxide |
| Morganza | 1,005 | 1 | 0 | |
| Mooringsport | 999 | 151 | 111 | Nitrate, Stage 2 DBP, TTHM +1 more |
| Pleasant Hill | 990 | 51 | 35 | Chlorine Dioxide, TTHM |
| Goldonna | 969 | 19 | 3 | Chlorine Dioxide, Disinfection Byproducts |
| Elizabeth | 966 | 3 | 0 | |
| Grosse Tete | 954 | 7 | 2 | Stage 2 DBP, TTHM |
| Mangham | 927 | 10 | 2 | Chlorine Dioxide |
| Hackberry | 926 | 10 | 0 | |
| Clarks | 906 | 14 | 4 | Chlorine Dioxide |
| Pine Prairie | 900 | 35 | 6 | Chlorine Dioxide, Stage 2 DBP |
| Estherwood | 891 | 20 | 9 | Chlorine Dioxide |
| Lisbon | 891 | 13 | 5 | Chlorine Dioxide, TTHM, Total Haloacetic Acids (HAA5) |
| Grand Chenier | 871 | 103 | 69 | Chlorine Dioxide, TTHM |
| Joyce | 840 | 170 | 137 | Chlorine Dioxide, Stage 2 DBP, TTHM +1 more |
| Morse | 806 | 14 | 6 | Chlorine Dioxide, Stage 2 DBP |
| Tullos | 792 | 163 | 138 | Chlorine Dioxide, TTHM, Total Haloacetic Acids (HAA5) |
| Waterproof | 786 | 141 | 19 | Contaminant 1006, E. coli, Stage 2 DBP |
| Urania | 784 | 7 | 1 | Chlorine Dioxide |
| Mermentau | 780 | 31 | 25 | Chlorine Dioxide |
| Tickfaw | 764 | 5 | 0 | |
| Hall Summit | 756 | 22 | 6 | Chlorine Dioxide |
| Pitkin | 750 | 4 | 1 | Chlorine Dioxide |
| Tangipahoa | 748 | 34 | 13 | Chlorine Dioxide, Stage 2 DBP |
| Brooklyn | 744 | 44 | 6 | Chlorine Dioxide, Stage 2 DBP |
| Wilson | 744 | 34 | 6 | Chlorine Dioxide, Disinfection Byproducts, Stage 2 DBP |
| Hosston | 729 | 77 | 45 | Chlorine Dioxide, Gross Alpha, TTHM |
| Sun | 726 | 29 | 17 | Chlorine Dioxide, Disinfection Byproducts |
| Oak Ridge | 714 | 6 | 0 | |
| St. Landry | 711 | 14 | 1 | Chlorine Dioxide |
| Florien | 700 | 15 | 9 | Chlorine Dioxide |
| Springfield | 695 | 62 | 29 | Chlorine Dioxide, TTHM |
| Ridgecrest | 684 | 183 | 148 | Chlorine Dioxide, TTHM, Total Haloacetic Acids (HAA5) |
| Rosedale | 664 | 23 | 17 | Chlorine Dioxide, TTHM |
| Clarence | 642 | 55 | 37 | Fecal Coliform, Gross Alpha, Stage 2 DBP +2 more |
| Sikes | 639 | 175 | 109 | Chlorine Dioxide, Stage 2 DBP, TTHM +1 more |
| Carville | 600 | 6 | 2 | Disinfection Byproducts |
| Epps | 594 | 61 | 19 | Chlorine Dioxide, Disinfection Byproducts |
| Calvin | 591 | 226 | 115 | Chlorine Dioxide, E. coli, Stage 2 DBP +2 more |
| Creole | 576 | 137 | 117 | Chlorine Dioxide, TTHM |
| Noble | 549 | 111 | 39 | Chlorine Dioxide, Disinfection Byproducts, E. coli +2 more |
| Madison | 534 | 6 | 0 | |
| Ida | 495 | 54 | 4 | Chlorine Dioxide |
| Austin | 435 | 54 | 13 | Chlorine Dioxide, Disinfection Byproducts, E. coli |
| Pinehurst | 420 | 26 | 2 | Chlorine Dioxide |
| Rodessa | 414 | 14 | 2 | Chlorine Dioxide, Stage 2 DBP |
| Elburn | 384 | 48 | 13 | Chlorine Dioxide |
| Delta | 369 | 12 | 2 | Chlorine Dioxide |
| Georgetown | 363 | 87 | 70 | Chlorine Dioxide, TTHM |
| Fisher | 348 | 7 | 0 | |
| Montpelier | 290 | 0 | 0 | |
| Norwood | 279 | 3 | 0 | |
| Lillie | 249 | 1 | 0 | |
| Fenton | 226 | 12 | 1 | Stage 2 DBP |
| Irving | 162 | 50 | 4 | Chlorine Dioxide, Stage 2 DBP |
| Lacombe | 150 | 7 | 0 | |
| St Amant | 149 | 42 | 11 | Chlorine Dioxide, Stage 2 DBP |
| Maurepas | 132 | 17 | 8 | Chlorine Dioxide, Stage 2 DBP |
| St. Benedict | 127 | 37 | 5 | Chlorine Dioxide |
| Kokomo | 120 | 8 | 2 | Disinfection Byproducts |
| Lakeland | 111 | 13 | 0 |
Data Sources
Drinking water data from the EPA Safe Drinking Water Information System (SDWIS). Only active community water systems (CWS) serving 100+ people are included.