EWG's Tap Water Database — 2021 UPDATE



Status: National drinking water standard exists


Endrin is a banned organochlorine insecticide that is persistent and bioaccumulative. Endrin damages the nervous, immune and reproductive systems in people. It also harms fish, birds and other wildlife.




states detected


utilities detected

3.2 million

people served


states over health guideline


utilities over health guideline


people served over health guideline

Health concerns for endrin


Change to the central nervous system

Harm to the immune system

Harm to the reproductive system

State and national drinking water standards and health guidelines

EWG Health Guideline 0.3 ppb

The EWG Health Guideline of 0.3 ppb for endrin 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 change to the heart and blood vessels.

EPA Maximum Contaminant
Level (MCL) 2 ppb

The legal limit for endrin, established in 1992, was based on a toxicity study in laboratory animals conducted in the 1960s.

ppb = parts per billion

States reporting endrin in drinking water

State UtilitiesPeople Served UtilitiesPeople Served
North Carolina00616,147

Filtering technologies that reduce endrin

carbon filter icon

Activated Carbon

reverse osmosis icon

Reverse Osmosis

Utilities with the highest amounts of endrin, 2017-2019

UtilityLocationTestsAverage levelPeople served
Piney PointHollywood, MD1 of 22.33 ppb672
Merriman, Village ofMerriman, NE1 of 50.970 ppb118
Borrego Water DistrictBorrego Springs, CA1 of 10.250 ppb3,403
Goehner, Village ofGoehner, NE1 of 110.0955 ppb185
Wynot, Village ofWynot, NE1 of 20.0750 ppb167
Trempealeau WaterworksTrempealeau, WI1 of 20.0650 ppb1,616
Hyndman Borough Water DepartmentHyndman, PA1 of 90.0567 ppb1,005
Willow Springs Mobile Home ParkGreenfield, IN1 of 30.0533 ppb25
Chapman, Village ofChapman, NE1 of 20.0500 ppb292
Benedict, Village ofBenedict, NE1 of 30.0363 ppb234
Elgin, City ofElgin, NE1 of 40.0258 ppb667
Suez Water New Jersey Franklin Lakes*Haworth, NJ1 of 10.0250 ppb5,038
Wauneta, Village ofWauneta, NE1 of 60.0173 ppb577
Evangeline Water Works District 1 - Pine PrairieFine Prairie, LA2 of 60.0150 ppb2,502
Watchtower Bible Tract SocietyPatterson, NY1 of 70.0143 ppb1,501
Northwest Grayson County Water Control and Improvement District 1*Gordonville, TX1 of 80.0138 ppb2,706
Bellefonte Borough Water AuthorityBellefonte, PA1 of 210.0114 ppb9,500
Happy Acres Mobile Home ParkFranklinton, LA2 of 60.01000 ppb120
Valentine, City ofValentine, NE1 of 160.00813 ppb2,737
Walnut Bayou Water Association*Tallulah, LA2 of 120.00650 ppb2,775
Warden Water SystemDelhi, LA2 of 120.00650 ppb240
East Carroll Ws SouthTransylvania, LA2 of 120.00650 ppb1,227
Delta Water SystemDelta, LA2 of 120.00650 ppb399
The Farms At SummerfieldDenver, NC1 of 60.00633 ppb46
City of DanburyDanbury, TX2 of 80.00625 ppb2,325
Wallace, Village ofWallace, NE1 of 170.00588 ppb366
Coronado Shores Water SystemSilverton, TX1 of 70.00571 ppb150
Melbille HeightsDenver, NC1 of 60.00550 ppb96
Litroe Water SystemMarion, LA2 of 80.00525 ppb369
Southern UtilitiesTyler, TX2 of 790.00506 ppb59,154
St. Tam Parish - Meadowlake SubdivisionCovington, LA2 of 40.00500 ppb1,197
St. Lucie Mobile VillageIndiantown, FL1 of 20.00500 ppb750
Oak Forest South Water SupplyAustin, TX1 of 20.00500 ppb645
Pike County Water Authority*Troy, AL1 of 280.00464 ppb10,590
North Of Crowley Water CorporationRayne, LA2 of 80.00425 ppb3,780
Camp-a-wyle Lake ResortWeeki Wachee, FL1 of 20.00330 ppb400
Horse Shoe Road Water SystemDoyline, LA2 of 80.00325 ppb270
Country Pines North Subdivision WsMandeville, LA2 of 220.00300 ppb936
Ballard Farms S/dDenver, NC1 of 60.00300 ppb125
Dixie Inn Water SystemMinden, LA2 of 140.00286 ppb404
Alma Plantation LtdLakeland, LA2 of 100.00260 ppb129
Cedar City WaterworksCedar City, UT1 of 220.00259 ppb31,223
Mountain Point S/dDenver, NC1 of 80.00250 ppb130
Pleasant Valley Water SystemMinden, LA2 of 100.00220 ppb918
City of Fort MeadeFort Meade, FL1 of 50.00200 ppb5,455
Tallulah Water SystemTallulah, LA2 of 160.00200 ppb9,195
North Franklin Water WorksCrowville, LA2 of 560.00200 ppb6,375
Florida Pines Mobile Home ParkVenice, FL1 of 20.00190 ppb280
Bermuda Mobile Home ParkKissimmee, FL1 of 70.00171 ppb48
Richmond Mobile Home ParkRichmond, IN1 of 540.00167 ppb150

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

UtilityLocationTestsAverage levelPeople served
Southern UtilitiesTyler, TX2 of 790.00506 ppb59,154
Pike County Water Authority*Troy, AL1 of 280.00464 ppb10,590
Cedar City WaterworksCedar City, UT1 of 220.00259 ppb31,223
Indiana American Water - Richmond*Greenwood, IN1 of 540.00167 ppb37,955
Indiana American Water - MuncieGreenwood, IN1 of 250.000800 ppb65,618
Arizona Water Company - LakesidePhoenix, AZ1 of 200.000500 ppb10,882
Schriever Water Treatment Service Area*Houma, LA2 of 240.000450 ppb97,152
Miramar (East & West) PlantsMiramar, FL1 of 160.000419 ppb127,700
Lafayette Utilities Water System*Lafayette, LA2 of 840.000333 ppb175,566
LPWD SouthMaurice, LA2 of 840.000333 ppb13,089
LPWDN North RegionLafayette, LA2 of 840.000333 ppb17,202
City of Youngsville Purchase WsYoungsville, LA2 of 840.000333 ppb14,259
Cliffdale WestHampstead, NC1 of 1300.000200 ppb15,463
City of Alexandria Water System*Alexandria, LA2 of 1920 ppb54,782
Gateway Services DistrictFort Myers, FL1 of 250 ppb12,717
Lee County Utilities*Fort Myers, FL1 of 250 ppb251,502
Naval Air Station Pensacola / Corry StationNas Pensacola, FL2 of 520 ppb22,600
City of Houston*Houston, TX1 of 1630 ppb2,231,588
City of WebsterWebster, TX1 of 1630 ppb13,710
City of South HoustonSouth Houston, TX1 of 1630 ppb17,397

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