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EWG's Tap Water Database — 2019 UPDATE

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Hexachlorocyclopentadiene

Status: National drinking water standard exists

 

Hexachlorocyclopentadiene was historically used for the manufacture of currently banned pesticides, such as endrin, dieldrin and chlordane. It's still used for production of flame retardants, resins and plastics.

2015-2017:

FOUND
FOUND ABOVE HEALTH GUIDELINES

28

states detected

213

utilities detected

5.1 million

people served

0

states over health guideline

0

utilities over health guideline

0

people served over health guideline

Health concerns for hexachlorocyclopentadiene

Harm to the stomach and intestines

Change to the liver

Change to the kidney

Irritation of the lungs

State and national drinking water standards and health guidelines

EWG Health Guideline 2 ppb

The EWG Health Guideline of 2 ppb for hexachlorocyclopentadiene was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against harm to the stomach and intestines.

EPA Maximum Contaminant
Level (MCL) 50 ppb

The legal limit for hexachlorocyclopentadiene, established in 1992, was based on a toxicity study in laboratory animals conducted in the 1980s.

ppb = parts per billion

States reporting hexachlorocyclopentadiene in drinking water

UTILITIES WITH CONTAMINATION
State UtilitiesPeople Served
Missouri71,210,242
Virginia8783,513
Colorado31720,921
Louisiana28448,541
Nevada3384,932
Pennsylvania9330,911
Florida24315,333
Oregon4204,794
Indiana16182,419
Delaware3108,123
Wisconsin479,239
North Carolina1376,500
Maryland564,592
Texas648,736
New Mexico1546,308
Hawaii128,702
Nebraska425,724
New York1124,724
West Virginia819,975
Massachusetts116,593
Wyoming213,200
Arkansas24,449
Vermont33,922
Montana1820
Alaska1225
Connecticut1221
Arizona1150
New Hampshire130
MORE
LESS

Filtering technologies that reduce hexachlorocyclopentadiene

carbon filter icon

Activated Carbon

reverse osmosis icon

Reverse Osmosis

Utilities with the highest amounts of hexachlorocyclopentadiene, 2015-2017

ALL UTILITIES
LARGE UTILITIES
UtilityLocationTestsAverage levelPeople served
Vallenar View Mobile Home ParkKetchikan, AK3 of 40.200 ppb225
Willsboro Water DistrictWillsboro, NY1 of 10.171 ppb1,571
Lumberton Mutual Domestic Water Consumers AssociationLumberton, NM1 of 10.150 ppb240
Bard College, NY1 of 10.130 ppb1,400
Bloomfield Water Supply System*Bloomfield, NM7 of 70.117 ppb7,433
Blanco Mutual Domestic Water Consumers AssociationBlanco, NM7 of 70.117 ppb1,348
West Hammond Mutual Domestic Water Consumers AssociationBloomfield, NM2 of 20.116 ppb3,578
Lee/hammond Water Treatment Plant Co-op*Farmington, NM2 of 20.116 ppb0
Lee Acres Water Users AssociationFarmington, NM2 of 20.116 ppb5,078
City of Rose CityVidor, TX1 of 30.113 ppb590
Navajo Dam Domestic Water Consumers Inc.Navajo Dam, NM3 of 30.104 ppb458
Sopris Village Homeowners AssociationSnowmass, CO1 of 30.103 ppb850
Fort DetrickFrederick, MD1 of 30.1000 ppb7,900
Beaver Valley Water CompanyPayson, AZ1 of 20.1000 ppb150
Lower Bucks County Joint Municipal Authority*Levittown,, PA1 of 20.0950 ppb66,100
Mcindoe Falls Fire District 3Mcindoe Falls, VT3 of 70.0900 ppb176
Fort Indiantown GapAnnville, PA1 of 30.0867 ppb2,500
Cornwall Borough Municipal AuthorityLebanon, PA1 of 30.0867 ppb2,385
Lebanon Water Authority*Lebanon, PA1 of 30.0867 ppb57,000
Upper La Plata Water Users AssociationLa Plata, NM2 of 20.0855 ppb2,265
Lower Valley Water Users Association*Kirtland, NM2 of 20.0855 ppb8,428
Harlem, City ofHarlem, MT1 of 20.0800 ppb820
City of Evanston*Evanston, WY2 of 30.0767 ppb12,000
Bear River Regional Joint PowersBear River, WY2 of 30.0767 ppb1,200
Thomas City OfThomas, WV1 of 20.0765 ppb702
Crested Butte, Town ofCrested Butte, CO2 of 40.0750 ppb2,000
Valley View Center For Nursing Care & RehabGoshen, NY4 of 100.0680 ppb850
Florida Village*Florida, NY4 of 100.0680 ppb4,585
O.c. Correctional FacilityGoshen, NY4 of 100.0680 ppb750
Hearthstone ManorChapaqua, NY4 of 100.0680 ppb110
Arrowhead Ranch Water CompanyMontrose, CO1 of 30.0667 ppb225
Carthage, Town ofCarthage, NC1 of 30.0653 ppb2,767
Yah Ta Hey W & SDYa Ta Hey, NM1 of 10.0610 ppb438
Hydro Pure Technology Inc.Aztec, NM1 of 10.0600 ppb25
Southside Mutual Domestic WaterAztec, NM1 of 10.0600 ppb1,593
Aztec Domestic Water System*Aztec, NM1 of 10.0600 ppb6,800
Hooversville Municipal AuthorityHooversville, PA1 of 20.0600 ppb879
United Water Pa MechanicsburgHarrisburg, PA1 of 50.0600 ppb27,381
Wilson MesaRidgway, CO1 of 30.0567 ppb200
United Water PennsylvaniaHarrisburg, PA1 of 50.0540 ppb97,645
Farmington Town Of*Farmington, WV1 of 20.0535 ppb692
Monongah Town Of*Monongah, WV1 of 20.0535 ppb3,214
Four States PsdWorthington, WV1 of 20.0535 ppb380
Coons Run PsdShinnston, WV1 of 20.0535 ppb820
Camelot IIIDerry, NH1 of 80.0525 ppb30
Sandy Point 480 Water SystemCampti, LA8 of 100.0518 ppb675
Lantana Water Treatment PlantLantana, FL3 of 30.0510 ppb9,432
Cove City, Town ofCove City, NC1 of 230.0509 ppb440
Craven County Water System*New Bern, NC1 of 230.0509 ppb31,000
City of Fort MeadeFort Meade, FL1 of 20.0500 ppb5,455

* 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 Hexachlorocyclopentadiene, but it likely has the contaminant in its water supply.

UtilityLocationTestsAverage levelPeople served
Lower Bucks County Joint Municipal Authority*Levittown,, PA1 of 20.0950 ppb66,100
Lebanon Water Authority*Lebanon, PA1 of 30.0867 ppb57,000
City of Evanston*Evanston, WY2 of 30.0767 ppb12,000
United Water Pa MechanicsburgHarrisburg, PA1 of 50.0600 ppb27,381
United Water PennsylvaniaHarrisburg, PA1 of 50.0540 ppb97,645
Craven County Water System*New Bern, NC1 of 230.0509 ppb31,000
Wisconsin Rapids Water Works & Lighting Comm.Wisconsin Rapids, WI1 of 10.0390 ppb20,000
Harris County FWSD 51*Houston, TX1 of 60.0383 ppb10,401
Havelock Water System*Havelock, NC1 of 40.0375 ppb14,246
Newport Municipal Utility DistrictHouston, TX2 of 60.0350 ppb10,374
Ellettsville Water WorksEllettsville, IN4 of 130.0308 ppb12,545
City of Bloomington Utilities*Bloomington, IN4 of 130.0308 ppb83,000
Southern Pines*Pinebluff, NC1 of 50.0288 ppb16,200
Fredonia Village*Fredonia, NY1 of 20.0275 ppb10,984
Upper Eagle Regional WAVail, CO7 of 230.0268 ppb31,581
Tri County WCDMontrose, CO2 of 50.0244 ppb17,000
City of Montrose*Montrose, CO2 of 50.0244 ppb17,000
Gretna WaterworksGretna, LA6 of 100.0238 ppb17,802
City of Port NechesPort Neches, TX1 of 60.0217 ppb13,040
Assumption Parish Waterworks District 1*Napoleonville, LA4 of 100.0210 ppb22,862
Sheboygan Water Utilities*Sheboygan, WI1 of 10.0200 ppb49,288
Wilmington Water Department*Wilmington, DE1 of 40.0193 ppb107,976
Lakeshore Swartz Water SystemWest Monroe, LA4 of 120.0175 ppb11,330
North Monroe Et Al Water SystemWest Monroe, LA4 of 120.0175 ppb10,866
Monroe Water System*Monroe, LA4 of 120.0175 ppb52,572
Naples Water DepartmentNaples, FL1 of 20.0175 ppb52,906
Bedford City Utilities*Bedford, IN2 of 120.0167 ppb14,000
Colorado Springs Utilities*Colorado Springs, CO6 of 210.0160 ppb418,096
Fort Carson Army BaseFort Carson, CO6 of 210.0160 ppb42,000
US Air Force AcademyUsaf Academy, CO6 of 210.0160 ppb16,876
Mt Werner WD*Steamboat Springs, CO1 of 40.0130 ppb16,980
City of South HoustonSouth Houston, TX1 of 180.0128 ppb13,578
City of Frederick*Frederick, MD1 of 240.0113 ppb54,000
Cherokee MD*Colorado Springs, CO2 of 240.00875 ppb20,600
Ashland Water and Sewer Department*Ashland, MA1 of 20.00850 ppb16,593
Stucker Fork Water Utility*Scottsburg, IN1 of 120.00833 ppb18,873
Salem Public Works*Salem, OR1 of 80.00763 ppb189,000
Suburban East Salem WDSalem, OR1 of 80.00763 ppb13,450
East Jefferson Waterworks District 1Jefferson, LA8 of 360.00756 ppb243,782
Centennial Water and Sanitation District*Highlands Ranch, CO1 of 180.00722 ppb88,042
Lake Utility Services Inc NorthClermont, FL1 of 180.00700 ppb21,518
Dunedin Water SystemDunedin, FL1 of 40.00675 ppb40,093
MakawaoWailuku, HI1 of 100.00630 ppb28,702
Morgan City Water System*Morgan City, LA2 of 120.00583 ppb12,703
Miramar (East & West) PlantsMiramar, FL1 of 60.00517 ppb128,729
Carson City Public Works*Carson City, NV3 of 600.00487 ppb56,000
Jefferson County PWSD 10Imperial, MO2 of 560.00357 ppb10,000
Jefferson County PWSD 3*Arnold, MO2 of 560.00357 ppb17,000
Missouri American St. Louis County & St. Charles County*Chesterfield, MO2 of 560.00357 ppb1,100,000
KirkwoodKirkwood, MO2 of 560.00357 ppb28,000

* 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 Hexachlorocyclopentadiene, but it likely has the contaminant in its water supply.