Water Quality in Oklahoma
889 water systems • 488 cities • EPA SDWIS Data
889
Water Systems
128,472
Total Violations
29,472
Health-Based Violations
3,653,817
Population Served
Overview
Oklahoma ranks 3rd among all U.S. states for total drinking water violations, out of 51 states tracked. The state has 128,472 EPA Safe Drinking Water Act violations on record across 889 water systems serving 488 cities. Of those, 29,472 are health-based violations, meaning a regulated contaminant was measured above the EPA-established safe level. Oklahoma's total violation count is 262% above the national average. Water systems in Oklahoma serve approximately 3,653,817 people. The most frequently cited contaminants in Oklahoma violations include Nitrate, Gross Alpha, Fecal Coliform, TTHM, Total Haloacetic Acids (HAA5).
Cities with Most Violations in Oklahoma
| # | City | Violations | Health-Based | Water Systems | Population |
|---|---|---|---|---|---|
| 1 | Tuttle | 5,700 | 40 | 3 | 4,732 |
| 2 | Edmond | 4,849 | 64 | 15 | 90,064 |
| 3 | Mcloud | 4,285 | 13 | 3 | 3,079 |
| 4 | Prue | 1,967 | 10 | 2 | 429 |
| 5 | Oilton | 1,797 | 4 | 1 | 1,435 |
| 6 | Prague | 1,703 | 13 | 1 | 2,395 |
| 7 | Oklahoma City | 1,673 | 56 | 11 | 677,192 |
| 8 | Vian | 1,536 | 12 | 2 | 1,471 |
| 9 | Tecumseh | 1,419 | 142 | 2 | 6,188 |
| 10 | Afton | 1,413 | 58 | 6 | 3,495 |
Largest Cities in Oklahoma
| # | City | Population | Violations | Water Systems |
|---|---|---|---|---|
| 1 | Oklahoma City | 677,192 | 1,673 | 11 |
| 2 | Tulsa | 416,005 | 577 | 4 |
| 3 | Broken Arrow | 142,122 | 114 | 2 |
| 4 | Norman | 139,525 | 960 | 6 |
| 5 | Lawton | 99,224 | 920 | 11 |
| 6 | Edmond | 90,064 | 4,849 | 15 |
| 7 | Stillwater | 72,946 | 168 | 6 |
| 8 | Claremore | 59,522 | 406 | 9 |
| 9 | Midwest City | 55,935 | 24 | 1 |
| 10 | Moore | 55,083 | 229 | 1 |
All Cities in Oklahoma
| City | Population | Violations | Health Violations | Contaminants |
|---|---|---|---|---|
| Oklahoma City | 677,192 | 1,673 | 56 | Gross Alpha, Haloacetic Acids, Nitrate +1 more |
| Tulsa | 416,005 | 577 | 7 | Gross Alpha, Nitrate, Stage 2 DBP |
| Broken Arrow | 142,122 | 114 | 94 | Bromate, E. coli, Fecal Coliform +2 more |
| Norman | 139,525 | 960 | 28 | E. coli, Gross Alpha, Nitrate +1 more |
| Lawton | 99,224 | 920 | 21 | E. coli, Gross Alpha, Nitrate +2 more |
| Edmond | 90,064 | 4,849 | 64 | Arsenic, E. coli, Fluoride +5 more |
| Stillwater | 72,946 | 168 | 83 | Contaminant 2920, E. coli, Fecal Coliform +5 more |
| Claremore | 59,522 | 406 | 189 | E. coli, Gross Alpha, Nitrate +3 more |
| Midwest City | 55,935 | 24 | 0 | |
| Moore | 55,083 | 229 | 40 | Arsenic, Barium, Gross Alpha +2 more |
| Enid | 54,039 | 1,013 | 38 | Gross Alpha, Nitrate, Nitrate-Nitrite +1 more |
| Muskogee | 43,745 | 452 | 379 | Gross Alpha, Nitrate, Stage 2 DBP +2 more |
| Ardmore | 36,278 | 543 | 227 | Contaminant 2920, E. coli, Fecal Coliform +6 more |
| Bartlesville | 35,948 | 339 | 245 | Contaminant 2920, E. coli, Fecal Coliform +3 more |
| Ponca City | 32,720 | 233 | 23 | Disinfection Byproducts, Gross Alpha, Nitrate +1 more |
| Ada | 32,154 | 91 | 7 | Gross Alpha, Nitrate, Stage 2 DBP |
| Shawnee | 32,108 | 348 | 36 | Contaminant 2920, E. coli, Gross Alpha +4 more |
| Collinsville | 30,775 | 41 | 11 | Gross Alpha, Stage 2 DBP, Total Haloacetic Acids (HAA5) |
| Sand Springs | 30,224 | 71 | 12 | Disinfection Byproducts, Gross Alpha, Nitrate +2 more |
| Jenks | 29,712 | 57 | 23 | Gross Alpha, Nitrate, Stage 2 DBP +1 more |
| Sapulpa | 29,012 | 83 | 30 | Fecal Coliform, Gross Alpha, Nitrate +2 more |
| Mcalester | 28,783 | 1,248 | 784 | Contaminant 2920, E. coli, Fecal Coliform +5 more |
| Sallisaw | 24,760 | 165 | 20 | E. coli, Fecal Coliform, Gross Alpha +2 more |
| Durant | 23,870 | 93 | 65 | Gross Alpha, TTHM, Total Haloacetic Acids (HAA5) |
| Altus | 23,699 | 372 | 179 | Contaminant 1009, Contaminant 2920, E. coli +5 more |
| Madill | 23,659 | 342 | 251 | Copper, Disinfection Byproducts, E. coli +5 more |
| Owasso | 23,176 | 118 | 3 | Gross Alpha, Nitrate, Stage 2 DBP |
| Yukon | 23,036 | 305 | 20 | Gross Alpha, Nitrate |
| Duncan | 23,000 | 88 | 63 | Contaminant 2920, E. coli, Gross Alpha +3 more |
| Fort Sill | 23,000 | 19 | 5 | Gross Alpha, Nitrate |
| Del City | 22,248 | 331 | 4 | E. coli, Nitrate, Stage 2 DBP |
| Tahlequah | 20,694 | 201 | 74 | Bromate, Gross Alpha, Nitrate +3 more |
| Bethany | 20,307 | 37 | 3 | E. coli, Gross Alpha |
| El Reno | 19,135 | 136 | 50 | E. coli, Fecal Coliform, Gross Alpha +3 more |
| Guthrie | 18,931 | 708 | 16 | Contaminant 1009, Contaminant 2920, Gross Alpha +3 more |
| Bixby | 18,750 | 12 | 1 | Stage 2 DBP |
| Mustang | 18,576 | 32 | 5 | Arsenic, Gross Alpha, Nitrate +1 more |
| Pryor | 17,228 | 479 | 14 | Gross Alpha, Nitrate, Stage 2 DBP |
| Chickasha | 16,976 | 137 | 86 | E. coli, Fecal Coliform, Gross Alpha +3 more |
| Wagoner | 16,242 | 526 | 279 | Contaminant 2920, E. coli, Fecal Coliform +5 more |
| Woodward | 15,960 | 395 | 22 | Gross Alpha, Nitrate, Nitrate-Nitrite +2 more |
| Okmulgee | 15,852 | 373 | 262 | Contaminant 2920, E. coli, Fecal Coliform +4 more |
| Skiatook | 14,757 | 132 | 31 | Fecal Coliform, Gross Alpha, TTHM |
| Miami | 14,319 | 303 | 13 | Gross Alpha, Nitrate, Stage 2 DBP |
| Coweta | 13,701 | 258 | 180 | Contaminant 2920, E. coli, Fecal Coliform +4 more |
| Eufaula | 13,284 | 701 | 405 | Contaminant 2920, E. coli, Fecal Coliform +4 more |
| Spiro | 13,094 | 347 | 262 | Contaminant 2920, Gross Alpha, Nitrate +3 more |
| Glenpool | 12,500 | 25 | 8 | Gross Alpha, Nitrate |
| Elk City | 12,277 | 625 | 9 | Gross Alpha, Nitrate, Stage 2 DBP |
| Vinita | 12,041 | 259 | 74 | E. coli, Gross Alpha, Nitrate +4 more |
| Broken Bow | 11,619 | 99 | 51 | E. coli, Fecal Coliform, Gross Alpha +4 more |
| Guymon | 11,442 | 29 | 8 | Gross Alpha, Lead, Nitrate +1 more |
| Checotah | 11,036 | 542 | 405 | Contaminant 2920, Fecal Coliform, Gross Alpha +5 more |
| Marlow | 11,026 | 29 | 14 | Gross Alpha, Nitrate, Stage 2 DBP +1 more |
| Sulphur | 10,989 | 18 | 7 | Gross Alpha, Nitrate, Stage 2 DBP |
| Weatherford | 10,970 | 248 | 27 | Barium, Gross Alpha, Nitrate +2 more |
| Mounds | 10,470 | 266 | 162 | Contaminant 1009, E. coli, Fecal Coliform +6 more |
| Poteau | 9,999 | 303 | 133 | Gross Alpha, Nitrate, Stage 2 DBP +2 more |
| Henryetta | 9,176 | 246 | 144 | Contaminant 2920, Gross Alpha, Nitrate +4 more |
| Pauls Valley | 9,041 | 61 | 31 | Contaminant 2920, Fecal Coliform, Gross Alpha +4 more |
| Clinton | 8,883 | 229 | 12 | E. coli, Fecal Coliform, Nitrate |
| Blackwell | 8,590 | 111 | 74 | E. coli, Fecal Coliform, Gross Alpha +2 more |
| Hastings | 8,398 | 488 | 139 | Gross Alpha, HAA5, TTHM |
| Chouteau | 8,380 | 57 | 3 | Gross Alpha, Nitrate, Stage 2 DBP |
| Cushing | 8,371 | 44 | 1 | Stage 2 DBP |
| Ochelata | 8,349 | 251 | 16 | Gross Alpha, Nitrate, Stage 2 DBP +1 more |
| Grove | 8,297 | 1,169 | 23 | Disinfection Byproducts, E. coli, Fecal Coliform +4 more |
| Hulbert | 8,115 | 318 | 36 | Contaminant 2920, E. coli, Gross Alpha +5 more |
| Fort Gibson | 8,002 | 349 | 146 | Contaminant 2920, E. coli, Fecal Coliform +5 more |
| Newcastle | 7,900 | 36 | 6 | Gross Alpha, Nitrate |
| Oologah | 7,725 | 38 | 6 | Gross Alpha, Nitrate, Stage 2 DBP +1 more |
| Perry | 7,665 | 802 | 121 | Contaminant 1009, Contaminant 2920, Gross Alpha +5 more |
| Piedmont | 7,542 | 160 | 39 | Arsenic, Gross Alpha, HAA5 +3 more |
| Antlers | 7,372 | 319 | 291 | Contaminant 2920, Fecal Coliform, Nitrate +3 more |
| Atoka | 7,313 | 360 | 277 | Contaminant 2920, E. coli, Fecal Coliform +4 more |
| Okemah | 7,186 | 158 | 67 | Fecal Coliform, Gross Alpha, Nitrate +1 more |
| Nowata | 7,101 | 767 | 418 | Bromate, Gross Alpha, Nitrate +3 more |
| Idabel | 6,952 | 216 | 190 | Contaminant 2920, Fecal Coliform, Gross Alpha +4 more |
| Stilwell | 6,951 | 48 | 6 | E. coli, Nitrate, Stage 2 DBP |
| Tishomingo | 6,933 | 180 | 58 | Bromate, Contaminant 2920, Disinfection Byproducts +7 more |
| Seminole | 6,899 | 8 | 2 | Gross Alpha |
| Cleveland | 6,844 | 433 | 340 | Contaminant 2920, Gross Alpha, Nitrate +4 more |
| Anadarko | 6,804 | 138 | 104 | Contaminant 2920, E. coli, Fecal Coliform +3 more |
| Purcell | 6,693 | 41 | 4 | Gross Alpha, Nitrate |
| Hartshorne | 6,521 | 315 | 263 | Gross Alpha, Nitrate, TTHM +1 more |
| Mannford | 6,435 | 45 | 4 | TTHM, Total Coliform (TCR) |
| Muldrow | 6,302 | 62 | 35 | Contaminant 2920, E. coli, Gross Alpha +3 more |
| Mead | 6,270 | 55 | 43 | E. coli, Fecal Coliform, Gross Alpha +2 more |
| Tecumseh | 6,188 | 1,419 | 142 | Contaminant 2920, E. coli, Haloacetic Acids +6 more |
| Noble | 6,087 | 891 | 215 | Barium, Gross Alpha, HAA5 +3 more |
| Ketchum | 5,830 | 72 | 2 | Nitrate |
| Wilburton | 5,775 | 101 | 63 | Contaminant 2920, E. coli, Nitrate +2 more |
| Morris | 5,750 | 455 | 357 | Disinfection Byproducts, Gross Alpha, Nitrate +3 more |
| Kellyville | 5,675 | 17 | 10 | E. coli, Gross Alpha, Nitrate +2 more |
| Earlsboro | 5,622 | 28 | 1 | Stage 2 DBP |
| Alva | 5,564 | 73 | 8 | Gross Alpha, Nitrate, Stage 2 DBP |
| Walters | 5,551 | 129 | 83 | Barium, Gross Alpha, Lead +5 more |
| Carnegie | 5,537 | 33 | 10 | Gross Alpha, Nitrate, Selenium +1 more |
| Hugo | 5,536 | 194 | 158 | Bromate, Contaminant 2920, E. coli +6 more |
| Holdenville | 5,532 | 319 | 183 | Contaminant 2920, E. coli, Fecal Coliform +4 more |
| Cache | 5,371 | 169 | 131 | Gross Alpha, Lead, Nitrate +2 more |
| Kingfisher | 5,310 | 744 | 61 | Gross Alpha, Nitrate, Selenium +2 more |
| Lexington | 5,166 | 221 | 18 | 1,2-Dichloroethane, Gross Alpha, Nitrate |
| Elgin | 5,140 | 196 | 13 | Gross Alpha, Nitrate, Stage 2 DBP |
| Wister | 5,057 | 440 | 141 | E. coli, Fecal Coliform, Gross Alpha +4 more |
| Locust Grove | 5,031 | 547 | 53 | Contaminant 2920, E. coli, Gross Alpha +4 more |
| Porum | 5,000 | 86 | 7 | E. coli, Gross Alpha, Nitrate +1 more |
| Westville | 4,869 | 299 | 21 | Contaminant 2920, E. coli, Gross Alpha +2 more |
| Lone Grove | 4,863 | 52 | 2 | Nitrate, Stage 2 DBP |
| Wynnewood | 4,849 | 183 | 69 | Contaminant 2920, E. coli, Stage 2 DBP +3 more |
| Tuttle | 4,732 | 5,700 | 40 | Chlorine, Gross Alpha, HAA5 +4 more |
| Pocola | 4,700 | 111 | 95 | TTHM, Total Haloacetic Acids (HAA5) |
| Harrah | 4,489 | 650 | 53 | Disinfection Byproducts, Endrin, Gross Alpha +4 more |
| Lindsay | 4,420 | 28 | 6 | Gross Alpha, Nitrate, Stage 2 DBP |
| Amber | 4,385 | 376 | 31 | Gross Alpha, HAA5, Nitrate +1 more |
| Sayre | 4,375 | 35 | 5 | Gross Alpha, Nitrate |
| Wewoka | 4,352 | 874 | 669 | Contaminant 2920, Disinfection Byproducts, E. coli +6 more |
| Haworth | 4,196 | 137 | 68 | Stage 2 DBP, TTHM, Total Haloacetic Acids (HAA5) |
| Quinton | 4,071 | 131 | 62 | Contaminant 2920, E. coli, Gross Alpha +4 more |
| Adair | 4,064 | 45 | 3 | Gross Alpha, Nitrate, Total Haloacetic Acids (HAA5) |
| Big Cabin | 4,043 | 120 | 64 | Gross Alpha, Nitrate, TTHM +1 more |
| Choctaw | 4,031 | 187 | 9 | E. coli, Gross Alpha, Nitrate |
| Jay | 4,020 | 135 | 57 | Contaminant 2920, Lead, Stage 2 DBP +2 more |
| Nichols Hills | 4,020 | 190 | 13 | Arsenic, Barium, Gross Alpha +3 more |
| Frederick | 3,940 | 115 | 107 | Contaminant 1009, Contaminant 2920, Gross Alpha +2 more |
| Dewey | 3,878 | 293 | 34 | Disinfection Byproducts, Gross Alpha, Nitrate +3 more |
| Pawhuska | 3,800 | 69 | 30 | E. coli, Stage 2 DBP, TTHM |
| Hobart | 3,746 | 18 | 3 | Gross Alpha |
| Spencer | 3,746 | 167 | 5 | Gross Alpha, Nitrate, Stage 2 DBP |
| Bristow | 3,700 | 718 | 1 | Stage 2 DBP |
| Fairview | 3,690 | 332 | 212 | Gross Alpha, Nitrate, Nitrate-Nitrite +2 more |
| Blair | 3,556 | 129 | 58 | Gross Alpha, Nitrate, Selenium +2 more |
| Pawnee | 3,555 | 684 | 332 | Contaminant 2920, Fecal Coliform, Gross Alpha +5 more |
| Chandler | 3,542 | 210 | 111 | Contaminant 2920, E. coli, Fecal Coliform +5 more |
| Afton | 3,495 | 1,413 | 58 | E. coli, Fecal Coliform, Gross Alpha +6 more |
| Blanchard | 3,485 | 84 | 12 | Stage 2 DBP, Surface Water Treatment |
| Caddo | 3,434 | 162 | 24 | Gross Alpha, Nitrate, Stage 2 DBP |
| Tonkawa | 3,299 | 25 | 2 | Gross Alpha, Stage 2 DBP |
| Comanche | 3,259 | 245 | 176 | Contaminant 2920, Gross Alpha, Nitrate +1 more |
| Inola | 3,149 | 65 | 4 | Stage 2 DBP, TTHM |
| Allen | 3,117 | 14 | 6 | Gross Alpha, Nitrate, Stage 2 DBP |
| Mangum | 3,099 | 58 | 6 | Gross Alpha, Nitrate, Stage 2 DBP |
| Mcloud | 3,079 | 4,285 | 13 | Gross Alpha, Nitrate, Stage 2 DBP |
| Gore | 3,013 | 128 | 48 | Contaminant 2920, E. coli, Nitrate +1 more |
| Newkirk | 3,008 | 167 | 66 | Disinfection Byproducts, Gross Alpha, Nitrate +3 more |
| Heavener | 3,000 | 103 | 54 | Contaminant 2920, E. coli, Fecal Coliform +4 more |
| Cordell | 2,903 | 63 | 8 | Nitrate-Nitrite |
| Fairland | 2,877 | 194 | 14 | Gross Alpha, Nitrate, Stage 2 DBP +1 more |
| Drumright | 2,876 | 17 | 2 | Gross Alpha |
| Roland | 2,842 | 5 | 2 | TTHM, Total Haloacetic Acids (HAA5) |
| Watonga | 2,816 | 60 | 38 | Gross Alpha, Nitrate-Nitrite, Selenium +1 more |
| Calera | 2,815 | 214 | 140 | Gross Alpha, Nitrate, Stage 2 DBP +2 more |
| Stroud | 2,811 | 139 | 104 | Contaminant 2920, E. coli, Gross Alpha +4 more |
| Healdton | 2,785 | 26 | 14 | Gross Alpha, Nitrate, TTHM |
| Stigler | 2,731 | 91 | 24 | Contaminant 2920, TTHM |
| Coalgate | 2,730 | 181 | 87 | Contaminant 2920, E. coli, Fecal Coliform +4 more |
| Hinton | 2,709 | 269 | 57 | Barium, Gross Alpha, HAA5 +3 more |
| Wetumka | 2,676 | 285 | 127 | Contaminant 2920, Gross Alpha, Nitrate +3 more |
| Catoosa | 2,668 | 53 | 0 | |
| Commerce | 2,645 | 29 | 5 | Gross Alpha, Stage 2 DBP |
| Marietta | 2,626 | 30 | 14 | Gross Alpha, Nitrate |
| Davis | 2,610 | 66 | 27 | Contaminant 2920, E. coli, Fecal Coliform +4 more |
| Wayne | 2,585 | 132 | 17 | E. coli, Gross Alpha, Nitrate +1 more |
| Hominy | 2,584 | 821 | 563 | Contaminant 2920, E. coli, Fecal Coliform +4 more |
| Perkins | 2,572 | 424 | 14 | Gross Alpha, Nitrate |
| Crescent | 2,557 | 43 | 8 | E. coli, Gross Alpha, Nitrate +1 more |
| Wainwright | 2,550 | 153 | 138 | Gross Alpha, Stage 2 DBP, TTHM +1 more |
| Hollis | 2,533 | 314 | 177 | Gross Alpha, Nitrate, Nitrate-Nitrite +1 more |
| Agra | 2,525 | 53 | 3 | Gross Alpha, Nitrate |
| Ramona | 2,516 | 455 | 89 | Gross Alpha, Nitrate, Stage 2 DBP +1 more |
| Cookson | 2,512 | 819 | 52 | Contaminant 2920, E. coli, Fecal Coliform +5 more |
| Bowlegs | 2,500 | 56 | 8 | Gross Alpha, Lead, Nitrate +1 more |
| Talihina | 2,450 | 401 | 284 | Contaminant 2920, E. coli, Fecal Coliform +4 more |
| Ninnekah | 2,425 | 28 | 3 | Gross Alpha, Nitrate, Stage 2 DBP |
| Granite | 2,424 | 125 | 15 | Gross Alpha, Nitrate, Selenium +1 more |
| Disney | 2,400 | 72 | 15 | Contaminant 2920, Nitrate, Stage 2 DBP +2 more |
| Porter | 2,400 | 134 | 104 | Nitrate, Stage 2 DBP, TTHM +1 more |
| Goodwell | 2,398 | 240 | 15 | Gross Alpha, Lead, Nitrate |
| Prague | 2,395 | 1,703 | 13 | E. coli, Gross Alpha, Nitrate +1 more |
| Preston | 2,355 | 258 | 177 | Gross Alpha, Stage 2 DBP, TTHM +1 more |
| Kansas | 2,329 | 236 | 11 | E. coli, Fecal Coliform, Nitrate +1 more |
| Colbert | 2,312 | 58 | 9 | Gross Alpha, Nitrate, Stage 2 DBP |
| Grant | 2,300 | 82 | 30 | Gross Alpha, Nitrate, Stage 2 DBP +1 more |
| Oktaha | 2,280 | 119 | 84 | TTHM, Total Haloacetic Acids (HAA5) |
| Clayton | 2,226 | 563 | 436 | Contaminant 2920, E. coli, Fecal Coliform +4 more |
| Crowder | 2,203 | 103 | 23 | E. coli, Nitrate, Stage 2 DBP +2 more |
| Okeene | 2,200 | 176 | 104 | Gross Alpha, Nitrate, Nitrate-Nitrite +2 more |
| Arkoma | 2,180 | 47 | 2 | Gross Alpha, Stage 2 DBP |
| Ratliff City | 2,131 | 124 | 98 | Gross Alpha, Nitrate, Stage 2 DBP +2 more |
| Chattanooga | 2,127 | 165 | 36 | Gross Alpha, Nitrate, Nitrate-Nitrite +3 more |
| Waurika | 2,100 | 301 | 275 | E. coli, Fecal Coliform, Nitrate +2 more |
| Tinker Afb | 2,100 | 11 | 0 | |
| Hennessey | 2,058 | 68 | 11 | Gross Alpha, Nitrate, Nitrate-Nitrite |
| Stringtown | 2,057 | 268 | 233 | Contaminant 2920, E. coli, Gross Alpha +3 more |
| Burns Flat | 2,057 | 21 | 4 | Nitrate, Stage 2 DBP |
| Krebs | 2,051 | 77 | 55 | Contaminant 2920, E. coli, TTHM +1 more |
| Yale | 2,047 | 395 | 310 | Nitrate, Stage 2 DBP, TTHM +1 more |
| Garber | 2,036 | 173 | 91 | Carbon Tetrachloride, Gross Alpha, Nitrate +2 more |
| Warner | 2,020 | 50 | 8 | Gross Alpha, TTHM, Total Coliform (TCR) |
| Haskell | 2,015 | 267 | 176 | Gross Alpha, Nitrate, Stage 2 DBP +2 more |
| Thackerville | 2,000 | 11 | 4 | Gross Alpha, Nitrate |
| Goldsby | 2,000 | 45 | 8 | Gross Alpha, Nitrate, Selenium +1 more |
| Indianola | 2,000 | 17 | 5 | Nitrate, Stage 2 DBP, TTHM |
| Garvin | 1,997 | 194 | 67 | Gross Alpha, Nitrate, Stage 2 DBP +2 more |
| Bison | 1,980 | 6 | 4 | Gross Alpha, Nitrate |
| Valliant | 1,970 | 127 | 98 | E. coli, Stage 2 DBP, TTHM +1 more |
| Chelsea | 1,964 | 39 | 2 | Fecal Coliform |
| Carter | 1,925 | 31 | 4 | Selenium |
| Shidler | 1,904 | 560 | 193 | Contaminant 2920, E. coli, Gross Alpha +5 more |
| Welch | 1,900 | 364 | 77 | E. coli, Gross Alpha, HAA5 +4 more |
| Schulter | 1,890 | 154 | 142 | Contaminant 1006, Nitrate, Stage 2 DBP +2 more |
| Erick | 1,880 | 218 | 10 | Gross Alpha, Nitrate, Nitrate-Nitrite +2 more |
| Okay | 1,877 | 110 | 75 | Fecal Coliform, Gross Alpha, Stage 2 DBP +2 more |
| Marshall | 1,876 | 33 | 4 | Nitrate, Nitrate-Nitrite, Stage 2 DBP |
| Elmore City | 1,863 | 45 | 4 | Gross Alpha, Nitrate, TTHM |
| Barnsdall | 1,804 | 776 | 521 | Contaminant 2920, E. coli, Fecal Coliform +4 more |
| Monroe | 1,800 | 77 | 12 | Gross Alpha, TTHM, Total Haloacetic Acids (HAA5) |
| Hooker | 1,788 | 66 | 3 | Nitrate |
| Boswell | 1,782 | 554 | 438 | Gross Alpha, Nitrate, Stage 2 DBP +2 more |
| Terlton | 1,775 | 149 | 48 | TTHM, Total Haloacetic Acids (HAA5) |
| Colcord | 1,731 | 166 | 6 | Gross Alpha, Nitrate, Stage 2 DBP |
| Jones | 1,727 | 24 | 4 | E. coli, Gross Alpha, Nitrate +1 more |
| Mooreland | 1,726 | 403 | 20 | Gross Alpha, Nitrate, Stage 2 DBP |
| Langston | 1,670 | 142 | 18 | Gross Alpha, Nitrate, TTHM +1 more |
| Fairfax | 1,655 | 667 | 472 | Contaminant 2920, E. coli, Gross Alpha +4 more |
| Whitesboro | 1,643 | 131 | 78 | Dichloromethane, Gross Alpha, Nitrate +2 more |
| Minco | 1,632 | 12 | 1 | Stage 2 DBP |
| Cherokee | 1,630 | 53 | 12 | Disinfection Byproducts, Gross Alpha, Nitrate +2 more |
| Stonewall | 1,627 | 34 | 2 | Stage 2 DBP |
| Wilson | 1,600 | 27 | 5 | Gross Alpha, Nitrate, Stage 2 DBP |
| Kingston | 1,600 | 21 | 9 | Gross Alpha, Nitrate, Stage 2 DBP |
| Howe | 1,593 | 52 | 18 | Gross Alpha, Nitrate, TTHM +1 more |
| Stratford | 1,575 | 17 | 7 | E. coli, Gross Alpha, Nitrate |
| Medford | 1,572 | 175 | 17 | Gross Alpha, Nitrate, Selenium +1 more |
| Beaver | 1,570 | 106 | 2 | Gross Alpha, Nitrate |
| Apache | 1,521 | 123 | 27 | Gross Alpha, HAA5, Haloacetic Acids +3 more |
| Snyder | 1,509 | 198 | 99 | Contaminant 2920, E. coli, Nitrate +3 more |
| Boise City | 1,483 | 238 | 5 | Nitrate, Stage 2 DBP |
| Konawa | 1,479 | 860 | 15 | E. coli, HAA5, Nitrate +1 more |
| Vian | 1,471 | 1,536 | 12 | E. coli, Gross Alpha, Nitrate +1 more |
| Oilton | 1,435 | 1,797 | 4 | Gross Alpha, Stage 2 DBP |
| Salina | 1,422 | 24 | 4 | Total Coliform (TCR) |
| Wellston | 1,400 | 131 | 79 | Stage 2 DBP, TTHM |
| Panama | 1,400 | 91 | 58 | Gross Alpha, Nitrate, TTHM |
| Buffalo | 1,398 | 417 | 8 | Gross Alpha, Nitrate |
| Waukomis | 1,366 | 15 | 2 | Nitrate |
| Beggs | 1,364 | 345 | 270 | Contaminant 2920, E. coli, Fecal Coliform +4 more |
| Okarche | 1,360 | 258 | 227 | Dichloromethane, Nitrate, Nitrate-Nitrite +2 more |
| Custer City | 1,353 | 16 | 2 | Nitrate-Nitrite, Stage 2 DBP |
| Calumet | 1,350 | 392 | 134 | Gross Alpha, Nitrate, Nitrate-Nitrite +2 more |
| Gould | 1,338 | 164 | 24 | Gross Alpha, Nitrate, Nitrate-Nitrite +1 more |
| Wyandotte | 1,314 | 927 | 5 | Gross Alpha, Nitrate, Stage 2 DBP |
| Council Hill | 1,300 | 418 | 207 | Contaminant 2920, Nitrate, Stage 2 DBP +2 more |
| Rush Springs | 1,278 | 51 | 6 | Gross Alpha, Nitrate |
| Geary | 1,258 | 369 | 120 | Gross Alpha, Nitrate, Nitrate-Nitrite +2 more |
| Ringling | 1,241 | 56 | 15 | Disinfection Byproducts, Gross Alpha, Lead +2 more |
| Thomas | 1,238 | 7 | 1 | Nitrate |
| Leedey | 1,236 | 113 | 15 | E. coli, Nitrate, Nitrate-Nitrite +1 more |
| Maysville | 1,212 | 517 | 378 | Contaminant 2920, E. coli, Fecal Coliform +4 more |
| Webbers Falls | 1,200 | 93 | 12 | Contaminant 2920, E. coli, Fecal Coliform |
| Shattuck | 1,200 | 81 | 12 | Gross Alpha, Nitrate, Stage 2 DBP |
| Geronimo | 1,200 | 29 | 1 | Stage 2 DBP |
| Sperry | 1,200 | 17 | 0 | |
| Tipton | 1,194 | 279 | 164 | Arsenic, Gross Alpha, Haloacetic Acids +4 more |
| Pond Creek | 1,182 | 32 | 5 | Nitrate, Stage 2 DBP |
| Cyril | 1,168 | 23 | 1 | Stage 2 DBP |
| Byron | 1,150 | 34 | 9 | Gross Alpha, Nitrate, Nitrate-Nitrite +1 more |
| Temple | 1,146 | 160 | 121 | Contaminant 2920, E. coli, Fecal Coliform +1 more |
| Stuart | 1,145 | 29 | 0 | |
| Maud | 1,136 | 57 | 9 | Gross Alpha, Lead, Nitrate |
| Grandfield | 1,110 | 283 | 262 | Gross Alpha, Nitrate-Nitrite, Selenium +1 more |
| Laverne | 1,097 | 183 | 1 | Gross Alpha |
| Hydro | 1,060 | 72 | 9 | Nitrate, Nitrate-Nitrite, Stage 2 DBP |
| Coffeyville | 1,050 | 134 | 49 | Gross Alpha, Nitrate, Stage 2 DBP +2 more |
| Quapaw | 1,046 | 179 | 11 | Gross Alpha, Nitrate, Stage 2 DBP |
| Meeker | 1,044 | 23 | 3 | Gross Alpha |
| Colony | 1,032 | 4 | 1 | Stage 2 DBP |
| Braggs | 1,030 | 32 | 4 | Nitrate |
| Stillwell | 1,025 | 25 | 0 | |
| Fletcher | 1,022 | 228 | 10 | Gross Alpha, Nitrate, Selenium +1 more |
| Boley | 1,000 | 1,051 | 17 | Gross Alpha, Nitrate, Stage 2 DBP |
| Weleetka | 998 | 250 | 134 | Contaminant 2920, E. coli, Fecal Coliform +5 more |
| Red Oak | 993 | 173 | 41 | Contaminant 2920, Fecal Coliform, Stage 2 DBP +2 more |
| Waynoka | 993 | 18 | 1 | Nitrate-Nitrite |
| Cheyenne | 978 | 206 | 48 | E. coli, Fecal Coliform, Nitrate +3 more |
| Velma | 960 | 35 | 3 | Gross Alpha, Nitrate |
| Albion | 959 | 150 | 92 | Gross Alpha, Nitrate, TTHM +1 more |
| Langley | 950 | 33 | 13 | Fecal Coliform, Nitrate, TTHM +1 more |
| Morrison | 950 | 51 | 3 | Gross Alpha, Stage 2 DBP, TTHM |
| Texhoma | 935 | 47 | 1 | Nitrate |
| Hodgen | 923 | 126 | 82 | Stage 2 DBP, TTHM, Total Haloacetic Acids (HAA5) |
| Kremlin | 920 | 326 | 54 | Gross Alpha, Nitrate, Nitrate-Nitrite +2 more |
| Dewar | 917 | 55 | 33 | Gross Alpha, Stage 2 DBP, TTHM +1 more |
| Cashion | 900 | 14 | 2 | Gross Alpha, Nitrate |
| Fittstown | 896 | 21 | 2 | E. coli, Stage 2 DBP |
| Haileyville | 889 | 87 | 41 | Gross Alpha, Stage 2 DBP, TTHM +1 more |
| Davenport | 881 | 156 | 130 | Gross Alpha, TTHM, Total Haloacetic Acids (HAA5) |
| Mountain View | 880 | 37 | 7 | Gross Alpha, Nitrate, Stage 2 DBP |
| Tyrone | 880 | 77 | 9 | Gross Alpha, Nitrate, Stage 2 DBP |
| New Port Richey | 860 | 55 | 13 | E. coli, Fecal Coliform |
| Seiling | 860 | 41 | 9 | Gross Alpha, Nitrate |
| Sentinel | 859 | 7 | 1 | Nitrate |
| Kiowa | 856 | 324 | 195 | Contaminant 2920, E. coli, Fecal Coliform +6 more |
| Hendrix | 820 | 364 | 7 | Gross Alpha, Nitrate, Stage 2 DBP |
| Roff | 800 | 69 | 20 | Nitrate, Stage 2 DBP |
| Ryan | 800 | 308 | 295 | Stage 2 DBP, TTHM, Total Haloacetic Acids (HAA5) |
| Savanna | 800 | 51 | 30 | Gross Alpha, Nitrate, Stage 2 DBP +1 more |
| Wright City | 792 | 164 | 117 | TTHM, Total Haloacetic Acids (HAA5) |
| South Coffeyville | 790 | 59 | 10 | Surface Water Treatment |
| Butler | 782 | 82 | 1 | Stage 2 DBP |
| Sterling | 762 | 61 | 13 | Gross Alpha, Nitrate, Stage 2 DBP |
| Mutual | 755 | 90 | 6 | Gross Alpha, Stage 2 DBP |
| Millerton | 755 | 157 | 111 | Stage 2 DBP, TTHM, Total Haloacetic Acids (HAA5) |
| Canton | 750 | 41 | 3 | Nitrate |
| Twin Oaks | 750 | 47 | 1 | Stage 2 DBP |
| Arapaho | 748 | 57 | 6 | Gross Alpha, Nitrate |
| Duke | 743 | 150 | 56 | Gross Alpha, Nitrate, Selenium +2 more |
| Copan | 733 | 189 | 84 | E. coli, Fecal Coliform, Nitrate +3 more |
| Nashoba | 725 | 165 | 120 | Stage 2 DBP, TTHM, Total Haloacetic Acids (HAA5) |
| Binger | 708 | 69 | 6 | Nitrate, Stage 2 DBP |
| Vici | 668 | 49 | 11 | Nitrate, Nitrate-Nitrite, Selenium |
| Fort Cobb | 667 | 18 | 3 | Nitrate-Nitrite, Stage 2 DBP |
| Verden | 659 | 33 | 10 | Gross Alpha, Selenium |
| Luther | 650 | 30 | 7 | Gross Alpha, Nitrate |
| Carney | 649 | 53 | 11 | Gross Alpha, HAA5, Nitrate |
| Alex | 635 | 136 | 9 | Gross Alpha, Nitrate, Stage 2 DBP |
| Glencoe | 628 | 137 | 113 | Stage 2 DBP, TTHM, Total Haloacetic Acids (HAA5) |
| Union City | 618 | 78 | 62 | TTHM |
| Fort Towson | 611 | 60 | 24 | E. coli, Fecal Coliform, Gross Alpha +1 more |
| Paoli | 610 | 110 | 13 | Gross Alpha, Nitrate, Stage 2 DBP |
| Olustee | 607 | 152 | 118 | TTHM |
| Coleman | 600 | 105 | 2 | Nitrate |
| Washington | 600 | 103 | 9 | Gross Alpha, Nitrate, Selenium +1 more |
| Smithville | 600 | 31 | 24 | E. coli, Stage 2 DBP, TTHM +1 more |
| Gans | 600 | 74 | 5 | Stage 2 DBP, TTHM |
| Mannsville | 587 | 50 | 6 | Gross Alpha, Nitrate |
| Lahoma | 577 | 10 | 1 | Nitrate |
| Oakhurst | 575 | 87 | 22 | Gross Alpha, Nitrate, Stage 2 DBP +1 more |
| Hammon | 568 | 18 | 1 | Stage 2 DBP |
| Bokchito | 564 | 35 | 6 | Gross Alpha, Nitrate, TTHM |
| Keota | 564 | 183 | 124 | Gross Alpha, Nitrate, Stage 2 DBP +2 more |
| Mccurtain | 560 | 234 | 180 | Stage 2 DBP, TTHM, Total Haloacetic Acids (HAA5) |
| Depew | 555 | 38 | 7 | Gross Alpha |
| Covington | 553 | 14 | 0 | |
| Dibble | 550 | 13 | 8 | Contaminant 1006 |
| Red Rock | 543 | 520 | 188 | Bromate, Contaminant 2920, E. coli +5 more |
| Osage | 540 | 666 | 14 | Gross Alpha, Nitrate, Stage 2 DBP |
| Forgan | 532 | 28 | 6 | Nitrate, Stage 2 DBP |
| Cement | 530 | 38 | 1 | Stage 2 DBP |
| Tupelo | 527 | 76 | 9 | Gross Alpha, Nitrate, Stage 2 DBP +1 more |
| Dill City | 526 | 58 | 34 | Gross Alpha, Nitrate, Nitrate-Nitrite +2 more |
| Canute | 524 | 297 | 24 | Nitrate-Nitrite, Selenium, Stage 2 DBP |
| Marland | 517 | 154 | 26 | Disinfection Byproducts, Gross Alpha, Nitrate +1 more |
| Boynton | 510 | 356 | 157 | E. coli, Gross Alpha, Stage 2 DBP +2 more |
| Achille | 506 | 30 | 3 | Gross Alpha, Nitrate |
| Bernice | 504 | 258 | 14 | Gross Alpha, HAA5, Lead +1 more |
| Corn | 500 | 74 | 10 | Barium, Nitrate, Stage 2 DBP |
| Hennepin | 500 | 85 | 78 | Nitrate, Stage 2 DBP, TTHM +1 more |
| San Jose | 500 | 13 | 0 | |
| Dustin | 496 | 144 | 21 | Disinfection Byproducts, Fecal Coliform, Gross Alpha +3 more |
| Arnett | 496 | 622 | 13 | Gross Alpha, Nitrate |
| Mountain Park | 473 | 74 | 63 | E. coli, Stage 2 DBP, TTHM |
| Eucha | 465 | 20 | 1 | TTHM |
| Ravia | 459 | 57 | 8 | Gross Alpha, Nitrate, Stage 2 DBP |
| Delaware | 456 | 495 | 14 | Contaminant 2920 |
| Wynona | 450 | 60 | 6 | Gross Alpha, Nitrate |
| Bokoshe | 450 | 106 | 60 | Gross Alpha, Nitrate, TTHM +1 more |
| Tryon | 448 | 315 | 23 | Arsenic, Contaminant 1008, HAA5 +4 more |
| Paden | 446 | 35 | 6 | Gross Alpha, Nitrate, Stage 2 DBP |
| Eldorado | 446 | 66 | 25 | Nitrate, TTHM |
| Lone Wolf | 445 | 76 | 14 | Nitrate, Nitrate-Nitrite, Stage 2 DBP |
| Wakita | 444 | 106 | 17 | Gross Alpha, Nitrate, Selenium +1 more |
| Helena | 443 | 119 | 4 | Disinfection Byproducts, Nitrate, Stage 2 DBP |
| Billings | 436 | 176 | 5 | E. coli, Nitrate, Selenium |
| North Miami | 433 | 44 | 2 | Nitrate, Stage 2 DBP |
| Spavinaw | 432 | 13 | 1 | E. coli |
| Gage | 429 | 69 | 15 | Gross Alpha, Nitrate, Selenium +1 more |
| Prue | 429 | 1,967 | 10 | Disinfection Byproducts, Gross Alpha, Nitrate +1 more |
| Capron | 426 | 83 | 8 | Gross Alpha, Nitrate, Stage 2 DBP |
| Ringwood | 424 | 25 | 5 | Nitrate |
| Wapanucka | 420 | 62 | 6 | Gross Alpha, Nitrate |
| Welling | 418 | 16 | 0 | |
| Lamont | 417 | 762 | 8 | Gross Alpha, Nitrate, Stage 2 DBP |
| Nicoma Park | 414 | 379 | 7 | Gross Alpha, Nitrate, Stage 2 DBP |
| Turpin | 412 | 483 | 11 | E. coli, Gross Alpha, Lead +1 more |
| Drummond | 405 | 32 | 8 | Gross Alpha, Nitrate |
| Sparks | 404 | 42 | 4 | Contaminant 2920, Gross Alpha, Nitrate |
| Wanette | 402 | 289 | 167 | Disinfection Byproducts, Stage 2 DBP, TTHM +1 more |
| Dover | 400 | 34 | 10 | Gross Alpha, Nitrate, Selenium +1 more |
| Jennings | 400 | 379 | 11 | Gross Alpha, Nitrate, Stage 2 DBP |
| Optima | 400 | 210 | 8 | Gross Alpha, Nitrate, Stage 2 DBP |
| Lehigh | 396 | 17 | 2 | Gross Alpha, Stage 2 DBP |
| Francis | 390 | 69 | 8 | Gross Alpha, Nitrate |
| Terral | 386 | 62 | 10 | Gross Alpha, Nitrate, Nitrate-Nitrite +2 more |
| Medicine Park | 382 | 65 | 4 | Gross Alpha, Nitrate, Stage 2 DBP |
| Ripley | 376 | 65 | 6 | Nitrate, Stage 2 DBP |
| Davidson | 375 | 132 | 63 | Gross Alpha, Nitrate, Nitrate-Nitrite +3 more |
| Asher | 375 | 230 | 181 | Stage 2 DBP, TTHM, Total Haloacetic Acids (HAA5) |
| Swink | 373 | 49 | 31 | Nitrate, Stage 2 DBP, TTHM +1 more |
| Taloga | 372 | 37 | 5 | Selenium |
| Kaw City | 372 | 89 | 4 | Disinfection Byproducts, Nitrate |
| Longdale | 363 | 41 | 13 | Gross Alpha, Nitrate |
| Avant | 361 | 285 | 143 | Fecal Coliform, Stage 2 DBP, TTHM +1 more |
| Sasakwa | 360 | 264 | 5 | Nitrate, Stage 2 DBP |
| Clarita | 360 | 30 | 12 | E. coli, Gross Alpha, Nitrate +2 more |
| Carmen | 355 | 440 | 56 | Nitrate, Nitrate-Nitrite, Selenium +1 more |
| Indiahoma | 350 | 154 | 96 | Disinfection Byproducts, Nitrate, Stage 2 DBP +1 more |
| Burneyville | 350 | 23 | 8 | Gross Alpha, Nitrate |
| Park Hill | 348 | 549 | 29 | Contaminant 2920, E. coli, Fecal Coliform +5 more |
| Cromwell | 337 | 89 | 67 | Gross Alpha, Nitrate, Stage 2 DBP +1 more |
| Gracemont | 336 | 246 | 19 | Gross Alpha, Nitrate, Stage 2 DBP |
| Ralston | 335 | 73 | 8 | Gross Alpha, Nitrate |
| Fort Supply | 328 | 22 | 4 | Nitrate, Stage 2 DBP |
| Fargo | 326 | 56 | 9 | Gross Alpha, Nitrate, Selenium |
| Cleo Springs | 326 | 49 | 36 | Nitrate, Nitrate-Nitrite |
| Randlett | 320 | 56 | 26 | Stage 2 DBP, TTHM |
| Milburn | 317 | 22 | 5 | Gross Alpha, Nitrate |
| Freedom | 317 | 130 | 10 | Gross Alpha, Nitrate, Stage 2 DBP |
| Watts | 316 | 30 | 0 | |
| Keyes | 315 | 65 | 14 | Gross Alpha, Lead, Nitrate |
| Mill Creek | 310 | 26 | 11 | Gross Alpha, Nitrate, Stage 2 DBP |
| Hanna | 308 | 91 | 7 | Gross Alpha, Nitrate, Stage 2 DBP |
| Bennington | 302 | 125 | 7 | Disinfection Byproducts, Gross Alpha, Nitrate |
| Soper | 300 | 132 | 14 | Nitrate, TTHM, Total Haloacetic Acids (HAA5) |
| Marina Del Rey | 300 | 50 | 4 | E. coli, Gross Alpha, Stage 2 DBP |
| Pocasset | 300 | 311 | 10 | Gross Alpha, Nitrate, Stage 2 DBP |
| Calvin | 300 | 54 | 5 | Nitrate, cis-1,2-Dichloroethylene |
| Leon | 300 | 57 | 8 | Gross Alpha, Nitrate |
| Arcadia | 300 | 31 | 9 | TTHM |
| Lenapah | 298 | 84 | 49 | E. coli, Gross Alpha, Nitrate +1 more |
| Coyle | 289 | 7 | 0 | |
| Pittsburg | 280 | 309 | 181 | Disinfection Byproducts, Fecal Coliform, Gross Alpha +2 more |
| Roosevelt | 280 | 139 | 6 | Gross Alpha, Nitrate, Stage 2 DBP |
| Eakly | 277 | 395 | 150 | Barium, Gross Alpha, Nitrate +2 more |
| Hardesty | 277 | 308 | 10 | Gross Alpha, Lead, Nitrate |
| Lookeba | 275 | 117 | 68 | Barium, Gross Alpha, Nitrate |
| Byars | 275 | 49 | 14 | Gross Alpha, Nitrate |
| Blue Jacket | 274 | 464 | 10 | Gross Alpha, Lead, Nitrate +1 more |
| Gotebo | 272 | 19 | 2 | Gross Alpha, Nitrate |
| Goltry | 268 | 34 | 10 | Disinfection Byproducts, Gross Alpha, Nitrate +1 more |
| Kendrick | 266 | 172 | 139 | TTHM, Total Haloacetic Acids (HAA5) |
| Ladera Ranch | 250 | 84 | 1 | Stage 2 DBP |
| Taft | 250 | 190 | 59 | Gross Alpha, Nitrate, TTHM +1 more |
| Braman | 244 | 32 | 17 | Gross Alpha, Nitrate, Stage 2 DBP +1 more |
| Sawyer | 235 | 168 | 126 | TTHM, Total Haloacetic Acids (HAA5) |
| Jet | 230 | 128 | 20 | Disinfection Byproducts, Gross Alpha, Nitrate +1 more |
| Longwood | 225 | 664 | 1 | Gross Alpha |
| St. Louis | 225 | 29 | 3 | Nitrate, Stage 2 DBP |
| Mulhall | 225 | 33 | 4 | Gross Alpha, Stage 2 DBP |
| Dallas | 225 | 93 | 1 | Stage 2 DBP |
| Englewood | 225 | 24 | 4 | Gross Alpha, Nitrate, Stage 2 DBP |
| Dougherty | 224 | 82 | 4 | Nitrate, Stage 2 DBP, Total Coliform (TCR) |
| Nash | 224 | 190 | 4 | E. coli, Gross Alpha, Nitrate |
| Aline | 214 | 160 | 114 | Nitrate, Nitrate-Nitrite, Selenium +1 more |
| Martha | 205 | 122 | 67 | Gross Alpha, Stage 2 DBP, TTHM |
| Rocky | 202 | 46 | 3 | Gross Alpha, Nitrate |
| Orlando | 201 | 1 | 0 | |
| Denver | 200 | 72 | 5 | Nitrate, Stage 2 DBP |
| Ames | 199 | 56 | 27 | Barium, Gross Alpha, Nitrate +1 more |
| Meno | 195 | 515 | 26 | Arsenic, Barium, Gross Alpha +2 more |
| Bessie | 190 | 12 | 2 | Nitrate |
| Reydon | 177 | 98 | 12 | Gross Alpha, Nitrate, Stage 2 DBP |
| Sharon | 175 | 475 | 2 | Gross Alpha, Stage 2 DBP |
| Hallett | 168 | 130 | 7 | Gross Alpha, Nitrate, Stage 2 DBP |
| Kenefic | 165 | 201 | 15 | Gross Alpha, Nitrate, Stage 2 DBP |
| Bromide | 163 | 37 | 6 | Nitrate |
| Burlington | 156 | 36 | 5 | Gross Alpha, Nitrate |
| Red Bird | 153 | 165 | 14 | Gross Alpha, Nitrate, Stage 2 DBP +1 more |
| Camargo | 150 | 75 | 7 | Nitrate, Stage 2 DBP |
| Devol | 150 | 68 | 47 | TTHM |
| Burbank | 150 | 40 | 0 | |
| Slick | 148 | 103 | 4 | Nitrate, Stage 2 DBP |
| Dacoma | 148 | 25 | 1 | Stage 2 DBP |
| Fairmont | 147 | 88 | 22 | Barium, Disinfection Byproducts, Gross Alpha +2 more |
| Deer Creek | 147 | 204 | 71 | Barium, Nitrate, Nitrate-Nitrite +2 more |
| Hitchcock | 141 | 80 | 13 | Nitrate, Selenium |
| Foss | 139 | 296 | 4 | Nitrate, Stage 2 DBP |
| Lincoln | 136 | 41 | 0 | |
| Adams | 135 | 64 | 5 | Nitrate |
| Faxon | 134 | 39 | 3 | Gross Alpha, Stage 2 DBP |
| Oakwood | 129 | 49 | 22 | Gross Alpha, Nitrate |
| Greenfield | 123 | 99 | 1 | Stage 2 DBP |
| Willow | 114 | 684 | 18 | Gross Alpha, Nitrate-Nitrite, Selenium +1 more |
| Jose | 114 | 16 | 2 | Nitrate, Stage 2 DBP |
| Hillsdale | 110 | 126 | 5 | Nitrate, Stage 2 DBP |
| Tullahassee | 106 | 257 | 94 | Gross Alpha, Stage 2 DBP, TTHM +1 more |
| Manchester | 104 | 321 | 3 | Gross Alpha, Nitrate, Stage 2 DBP |
| Bird Island | 100 | 40 | 12 | Stage 2 DBP, TTHM, Total Haloacetic Acids (HAA5) |
Water Quality in Other States
Alabama 13,972 violations Alaska 73,527 violations Arizona 60,414 violations Arkansas 17,031 violations California 39,276 violations Colorado 42,596 violations Connecticut 28,800 violations Delaware 1,242 violations District of Columbia 115 violations Florida 36,335 violations Georgia 32,159 violations Hawaii 182 violations Idaho 26,078 violations Illinois 30,544 violations Indiana 18,261 violations Iowa 9,389 violations Kansas 19,480 violations Kentucky 9,427 violations Louisiana 32,039 violations Maine 6,830 violations Maryland 5,321 violations Massachusetts 10,561 violations Michigan 15,820 violations Minnesota 3,784 violations Mississippi 25,296 violations Missouri 25,377 violations Montana 20,202 violations Nebraska 5,134 violations Nevada 8,167 violations New Hampshire 6,968 violations New Jersey 19,332 violations New Mexico 37,115 violations New York 93,834 violations North Carolina 54,399 violations North Dakota 8,431 violations Ohio 61,604 violations Oregon 0 violations Pennsylvania 199,265 violations Rhode Island 0 violations South Carolina 13,045 violations South Dakota 19,565 violations Tennessee 20,607 violations Texas 263,180 violations Utah 71,655 violations Vermont 12,362 violations Virginia 15,298 violations Washington 54,459 violations West Virginia 81,622 violations Wisconsin 18,533 violations Wyoming 13,783 violations
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.