Water Systems with the Most Health-Based Violations

These are the 100 active U.S. public water systems with the most health-based violations on record in the EPA's Safe Drinking Water Information System. Health-based violations mean a system exceeded an EPA maximum contaminant level (MCL) or failed required treatment.

A high violation count doesn't necessarily mean a system is currently unsafe — many violations may have been resolved. Check individual system pages for current compliance status and active violations.

Water SystemLocationPopulationHealth ViolationsTotal Violations
City of Brady Water System Brady, Texas5,371 1,0071,045
Waukesha Water Utility Waukesha, Wisconsin70,718 779874
Tempe Wsc 1 Livingston, Texas2,725 568788
Hominy Hominy, Oklahoma2,584 563821
May Valley Wa Wiley, Colorado1,500 412614
Barnsdall Barnsdall, Oklahoma1,243 379567
Bullman Beach Neah Bay, Washington27 379396
Maysville Maysville, Oklahoma1,212 378517
Wewoka Public Works Authority Wewoka, Oklahoma3,450 378498
Cal Am - Oakhurst Sacramento, California3,693 368369
Sardis Lake Water Authority Clayton, Oklahoma307 366419
Cal Am - Raymond Sacramento, California343 364365
Mohawk Valley School District Roll, Arizona171 348727
Valley Estates Shallowater, Texas68 3382,807
Stormlight Mobile Home Park Lubbock, Texas76 3381,082
Cleveland Municipal Authority Cleveland, Oklahoma3,262 337394
Cassie Water System Des Peres, Missouri106 331773
City of Nome Nome, Texas825 330507
Fairfax Fairfax, Oklahoma1,555 313431
Franklin Water Systems 3 Des Peres, Missouri201 3061,172
City of Seagraves Seagraves, Texas2,417 305327
City of Opdyke West Levelland, Texas220 302647
City of Plains Plains, Texas1,355 301305
City of Rose City Vidor, Texas664 300805
Geo Specialty Chemicals Milford, Illinois46 299616
Ryan Utilities Authority Ryan, Oklahoma800 295308
Kendall County Wcid 1 Comfort, Texas3,579 289484
Forest Wsc Wells, Texas651 288754
Seven Estates Wolfforth, Texas189 2874,407
A C Valley Development Corp Foxburg, Pennsylvania500 285810
Csa 70 W-4 Pioneertown San Bernardino, California470 284296
Metropolitano San Juan, Puerto Rico1,077,332 278616
Rescue Waterworks Rescue, Virginia203 277279
City of Mason Mason, Texas2,228 276343
Waurika Public Works Authority Waurika, Oklahoma2,100 275301
Millersview Doole Wsc Millersview, Texas3,987 274350
Beggs Beggs, Oklahoma1,364 270345
South Swink Water Authority La Junta, Colorado622 264264
Vixen Water System Alexandria, Louisiana774 262336
Grandfield Grandfield, Oklahoma1,110 262283
Camino Real Regional Utility Authority Sunland Park, New Mexico19,466 258438
City of New Home New Home, Texas965 250305
Oil City Water Works Oil City, Louisiana2,148 246310
Osage Co Rwd #20 (Hulah) Bartlesville, Oklahoma350 243288
Klondike Isd Lamesa, Texas311 242402
Lowndes Co.-Alapaha Plantation S/D Valdosta, Georgia362 240255
Town North Estates Lubbock, Texas216 237383
Grindstone Rancheria Elk Creek, California150 2341,142
City of Seminole Seminole, Texas7,386 234275
Bellwood Water System Provencal, Louisiana1,032 234236
Choctaw Co. Rwsg & Swmd #6 Boswell, Oklahoma850 233318
Pushmataha Co. Rwd #3 Antlers, Oklahoma4,825 233244
Specht Store San Antonio, Texas170 232693
Eufaula Pwa Eufaula, Oklahoma2,766 231459
Village of Surfside Beach Surfside Beach, Texas5,697 226458
Calico Ghost Town San Bernardino, California24,623 224229
Saucelito Elementary School Terra Bella, California87 222262
Pittsburg Co. Rwd #14 Mcalester, Oklahoma1,680 220281
Rra Preston Shores Water System Wichita Falls, Texas2,277 220230
Lordsburg Water Supply System Lordsburg, New Mexico3,213 219352
Plott Acres Lubbock, Texas204 219334
Barksdale Wsc Barksdale, Texas279 216494
Gypsy River Resort New Braunfels, Texas87 215682
Rowena Wsc Rowena, Texas528 215413
Wagoner Co. Rwd #2 Wagoner, Oklahoma2,000 210376
Town of Ferriday Water System Ferriday, Louisiana4,193 208311
Muskogee Co. Rwd #3 Council Hill, Oklahoma1,300 207418
Rosemount Water Co Reno, Nevada54 205750
Pendleton Water Association Many, Louisiana2,634 205342
Lee County Water Association Marianna, Arkansas3,770 205335
Miami Water Users Association Springer, New Mexico135 205250
Boswell Public Works Authority Boswell, Oklahoma932 205236
Lake St John Waterworks District 1 Ferriday, Louisiana2,067 205222
Fairview Union Water System Coushatta, Louisiana2,346 203279
North Edwards Wd North Edwards, California1,105 203224
Ellinger Sewer and Wsc Ellinger, Texas573 199210
Stringtown Pwa Stringtown, Oklahoma1,105 198212
Kickapoo Tribal Waterworks Horton, Kansas520 197669
Mission Creek Water Assn Bonners Ferry, Idaho263 195345
Springer Water System Springer, New Mexico1,170 195327
City of Edgar Edgar, Nebraska428 194195
City of Wellman Wellman, Texas200 193271
Muskogee Co. Rwd #5 Muskogee, Oklahoma4,135 192205
Red Hill Waterworks Inc. Harrisonburg, Louisiana1,914 192203
Sandy Point 480 Water System Campti, Louisiana654 191237
City of Wolfforth Wolfforth, Texas9,600 190283
Jones Mcginty Water System Bonita, Louisiana696 190231
Idabel Pwa Idabel, Oklahoma6,952 190216
Ebarb Wwks Dist #1 - North Ebarb Zwolle, Louisiana1,761 190215
Howard Water Coop Waxahachie, Texas117 188281
Shidler Shidler, Oklahoma404 187241
Shirt Tail Gulch Development Black Hawk, South Dakota65 187200
West Winn Water System Inc Winnfield, Louisiana2,064 187196
Lakewood Water System Huntington, Texas48 186789
Tatitlek Water System Tatitlek, Alaska95 183541
Southern Okla Water Corp Ardmore, Oklahoma11,250 182213
Pittsburg Pittsburg, Oklahoma280 181309
Asher Util Dev Auth Asher, Oklahoma375 181230
Coweta Pwa Coweta, Oklahoma9,450 180249
Mccurtain Municipal Authority Mccurtain, Oklahoma560 180234

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