EWG's Tap Water Database — 2019 UPDATE



Status: National drinking water standard exists


The herbicide dalapon has not been used in the U.S. since 1999. In animal studies, exposure to dalapon harms the kidneys.




states detected


utilities detected

7.1 million

people served

Health concerns for dalapon

Harm to the kidney

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 200 ppb

The legal limit for dalapon, established in 1992, was based on a toxicity study in laboratory animals published in 1960.

ppb = parts per billion

States reporting dalapon in drinking water

State UtilitiesPeople Served
District Of Columbia3648,882
North Carolina34473,736
New York32221,501
South Carolina316,607
New Mexico210,693
West Virginia23,858
North Dakota41,865
New Hampshire130

Filtering technologies that reduce dalapon

carbon filter icon

Activated Carbon

reverse osmosis icon

Reverse Osmosis

Utilities with the highest amounts of dalapon, 2015-2017

UtilityLocationTestsAverage levelPeople served
Barrett Lake Mobile Home and Rv LLCDulzura, CA1 of 241.5 ppb150
Cattle Creek WuaSnowmass, CO1 of 211.8 ppb47
Emma PWS*Emma, MO1 of 49.88 ppb205
Concordia PWS*Concordia, MO1 of 49.88 ppb2,500
Stagecoach S/dGarner, NC4 of 86.94 ppb556
Placer Cwa - Bianchi EstatesAuburn, CA1 of 45.00 ppb122
City of Roseville*Roseville, CA1 of 45.00 ppb119,000
Calam - West PlacerSacramento, CA1 of 45.00 ppb3,188
Langston Estates S/dApex, NC3 of 74.07 ppb180
Palm and Pines Mobile Home ParkFelda, FL2 of 33.67 ppb150
Forest Pointe S/dGastonia, NC4 of 53.48 ppb95
Holiday Travel ParkBunnell, FL3 of 32.93 ppb82
Pendleton Water AssociationMany, LA10 of 122.45 ppb2,211
Cypress Mobile Home ParkFort Pierce, FL5 of 62.43 ppb87
College Mobile Home ParkOrlando, FL4 of 72.39 ppb90
City of NomeNome, TX19 of 252.33 ppb753
Spring Point Homeowners AssociationDeer Harbor, WA1 of 12.30 ppb90
Bard College, NY1 of 12.20 ppb1,400
SoutheastFrostproof, FL2 of 22.10 ppb2,828
Fairview Union Water System*Campti, LA22 of 322.07 ppb2,205
Springlake Village Water Treatment PlantKissimmee, FL4 of 42.05 ppb3,070
Port Buena VistaEast Palatka, FL3 of 51.96 ppb135
Wahpeton Water SupplyWahpeton, IA4 of 41.90 ppb438
Camelot IIIDerry, NH1 of 21.90 ppb30
Ayden, Town ofAyden, NC1 of 71.90 ppb5,022
Walton PsdWalton, WV1 of 11.85 ppb2,012
Peg Leg Cove Water SystemScott, LA12 of 121.81 ppb189
South Toledo Bend Water District*Many, LA12 of 121.81 ppb5,802
Mcindoe Falls Fire District 3Mcindoe Falls, VT1 of 11.80 ppb176
Moriah Water DistrictPort Henry, NY1 of 11.77 ppb3,100
Buttonwood Bay Mobile Home ParkSebring, FL6 of 71.70 ppb2,000
Bonita Water SystemBonita, LA2 of 41.50 ppb576
Mount Royal Common Property LLCCrescent City, FL3 of 31.50 ppb86
De Witt Water SupplyDewitt, IA1 of 11.50 ppb5,322
Manitou Springs, City ofManitou Springs, CO2 of 31.50 ppb4,890
Sandy Point 480 Water SystemCampti, LA6 of 121.50 ppb675
Waverly Water SystemLake Wales, FL5 of 81.48 ppb1,479
Quail Ridge Estates Water SystemGold River, LA2 of 61.43 ppb1,119
Orchard Park Wa Inc.Canon City, CO2 of 41.43 ppb92
Hays Cattle and TruckingCanon City, CO2 of 41.43 ppb90
Brookside, Town ofBrookside, CO2 of 41.43 ppb410
Canon City*Canon City, CO2 of 41.43 ppb34,800
Silver Lake Institute - Castile Water District #1Castile, NY1 of 11.40 ppb440
Perry Village*Perry, NY1 of 11.40 ppb4,348
Gardeau Water DistrictCastile, NY1 of 11.40 ppb60
Perry Center Water DistrictPerry, NY1 of 11.40 ppb150
Roche Harbor Water System Inc.Friday Harbor, WA1 of 11.39 ppb329
Nys office of Children & Family ServicesHighland, NY6 of 61.39 ppb470
Sirwa #3 (leon)Creston, IA4 of 41.33 ppb2,395
Leon Water Supply*Leon, IA4 of 41.33 ppb1,977

* This water utility supplies finished drinking water to at least one other water utility. The purchasing utility is not required to test for or report Dalapon, but it likely has the contaminant in its water supply.

UtilityLocationTestsAverage levelPeople served
City of Roseville*Roseville, CA1 of 45.00 ppb119,000
Canon City*Canon City, CO2 of 41.43 ppb34,800
City of ClermontClermont, FL3 of 61.23 ppb11,265
Buenaventura LakesKissimmee, FL1 of 11.000 ppb16,569
CentralWinter Haven, FL15 of 240.929 ppb13,595
East Larimer County WD*Fort Collins, CO2 of 40.900 ppb19,472
North Weld County WD*Lucerne, CO2 of 40.900 ppb10,640
Pennsylvania American Water CompanyHummelstown, PA1 of 30.800 ppb43,005
Boynton Beach Water Treatment PlantBoynton Beach, FL3 of 90.756 ppb102,512
City of Winter ParkWinter Park, FL7 of 140.729 ppb82,984
Boca Raton Water Treatment PlantBoca Raton, FL1 of 20.700 ppb130,001
North Port UtilitiesNorth Port, FL3 of 70.671 ppb42,477
City of Plant City Utility*Plant City, FL2 of 60.650 ppb35,850
Riviera Beach Utility District*Riviera Beach, FL5 of 130.636 ppb31,500
City of Mount DoraMount Dora, FL4 of 70.601 ppb29,996
City of New Smyrna BeachNew Smyrna Beach, FL1 of 20.600 ppb52,398
SIRWA #2 (Creston)*Creston, IA2 of 20.600 ppb18,510
Bethlehem Water District No. 1*Delmar, NY2 of 80.570 ppb62,062
Northeast*Davenport, FL5 of 160.569 ppb59,183
City of Eden*Eden, NC1 of 30.533 ppb15,527
Dan River Water IncEden, NC1 of 30.533 ppb11,890
Daytona Beach*Daytona Beach, FL2 of 80.500 ppb88,918
City of South DaytonaSouth Daytona, FL2 of 80.500 ppb12,437
City of Punta GordaPunta Gorda, FL1 of 30.500 ppb29,561
Beaver Falls Municipal Authority*Beaver Falls, PA1 of 30.490 ppb50,000
Okeechobee Utility AuthorityOkeechobee, FL5 of 80.483 ppb20,000
Orange County Utilities Department (OCUD) - SouthOrlando, FL6 of 120.467 ppb91,196
New Kensington Municipal AuthorityNew Kensington, PA1 of 30.457 ppb47,800
City of MaitlandMaitland, FL2 of 70.443 ppb13,268
North Table Mountain WSDGolden, CO1 of 50.440 ppb10,000
Pinellas County Utilities*Clearwater, FL3 of 50.428 ppb426,877
Safety Harbor Water DepartmentSafety Harbor, FL3 of 50.428 ppb16,473
Pinellas Park Water DepartmentPinellas Park, FL3 of 50.428 ppb43,426
Gretna WaterworksGretna, LA4 of 100.410 ppb17,802
Orange County Utilities Department (OCUD) - EastOrlando, FL4 of 70.409 ppb290,878
St Bernard Parish WaterworksChalmette, LA2 of 100.400 ppb44,000
Wilmington Water Department*Wilmington, DE1 of 20.395 ppb107,976
City of WildwoodWildwood, FL2 of 110.382 ppb13,334
Assumption Parish Waterworks District 1*Napoleonville, LA2 of 100.380 ppb22,862
Richmond County Water System*Rockingham, NC3 of 140.379 ppb25,410
Sheboygan Water Utilities*Sheboygan, WI1 of 10.370 ppb49,288
Natchitoches Water System*Natchitoches, LA2 of 120.367 ppb30,000
City of Durham*Durham, NC4 of 160.363 ppb265,472
Montgomery County MUD 60The Woodlands, TX13 of 480.346 ppb10,654
City of Port St. JoePort St. Joe, FL1 of 50.320 ppb12,806
St John Water District 1Laplace, LA2 of 120.300 ppb12,577
Toho Water Authority - Poinciana SystemKissimmee, FL1 of 30.297 ppb69,447
Montgomery Trace Water SystemNavasota, TX8 of 490.284 ppb12,180
City of Goldsboro*Goldsboro, NC1 of 40.275 ppb36,306
Wayne Water Districts PurchaseGoldsboro, NC1 of 40.275 ppb16,302

* This water utility supplies finished drinking water to at least one other water utility. The purchasing utility is not required to test for or report Dalapon, but it likely has the contaminant in its water supply.