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CONTAMINANT

Simazine

FOUND

Exceeding guidelines

STATES DETECTED

24

serves

16 million

utilities detected

686

states detected

10

serves

108,000

utilities detected

46

Overview

Simazine is a hormone-disrupting herbicide related to atrazine. It affects the male and female reproductive systems. In studies of laboratory animals, simazine increases blood levels of estrogen, decreases prolactin and progesterone, and causes mammary and ovarian tumors.

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.1 ppb

The EWG Health Guideline of 0.1 ppb for simazine was defined by EWG based on epidemiological studies of human exposure to atrazine in drinking water. This health guideline protects against harm to the developing fetus, harm to the reproductive system and hormone disruption.

EPA Maximum Contaminant
Level (MCL): 4 ppb

The legal limit for simazine, established in 1992, was based on toxicity studies in laboratory animals conducted in the 1980s. This limit does not fully protect against harm to the reproductive system, harm to the developing fetus, and hormone disruption.

ppb = parts per billion

National Standard Exists

Health Concerns:

  • Harm to the developing fetus

  • Hormone disruption

  • Harm to the reproductive system

  • Changes in the nervous system

  • Changes in brain and behavior

  • Cancer

Want to remove
Simazine from your water?

Try these filter technologies:

Activated Carbon, 

Reverse Osmosis, 

understand filter technology

Simazine around the Country

UTILITIES REPORTING ABOVE HEALTH GUIDELINES UTILITIES WITH CONTAMINATION
State Utilities People Served Utilities People Served
Texas15,1303989,772,723
North Carolina00511,824,908
Indiana00251,376,479
Louisiana11,878321,269,717
District Of Columbia003847,323
Ohio0023365,677
Illinois3782,75696268,759
Oklahoma0011208,232
Delaware001107,976
Pennsylvania11,890471,781
Florida11301352,317
Alabama00142,267
Arkansas00429,763
California146429,545
Massachusetts00123,989
Arizona1614915,396
South Carolina115,297115,297
Georgia1239213,739
Wisconsin00112,048
New York0017,500
Iowa133722,852
Tennessee0011,288
West Virginia001555
Minnesota001156

Utilities with the highest amounts of simazine, 2021-2023

ALL UTILITIES
LARGE UTILITIES
Utility Location Tests Average level People served
NorwoodNorwood, GA1 of 41.80 ppb239
KinmundyKinmundy, IL3 of 130.685 ppb940
Flora*Flora, IL3 of 130.685 ppb5,478
FarinaFarina, IL3 of 130.685 ppb550
PatokaPatoka, IL3 of 130.685 ppb603
Gateway Regional Water Company*Sandoval, IL3 of 130.685 ppb1
Fmc Water Company*Odin, IL3 of 130.685 ppb2,836
XeniaXenia, IL3 of 130.685 ppb545
Hillcrest Estates, Inc.Zephyrhills, FL1 of 10.600 ppb130
Fowler Care CenterFowler, CA1 of 10.570 ppb46
Hillsboro*Hillsboro, IL5 of 120.373 ppb4,359
Taylor SpringsTaylor Springs, IL5 of 120.373 ppb600
CoffeenAviston, IL5 of 120.373 ppb685
Graham Correctional SiteHillsboro, IL5 of 120.373 ppb1,980
Schram CityHillsboro, IL5 of 120.373 ppb586
White CityMount Olive, IL4 of 80.330 ppb433
Staunton*Staunton, IL4 of 80.330 ppb6,029
Irvington*Centralia, IL6 of 120.315 ppb1,245
Walnut HillCentralia, IL6 of 120.315 ppb1,305
SandovalSandoval, IL6 of 120.315 ppb1,528
Junction CityCentralia, IL6 of 120.315 ppb494
Centralia*Centralia, IL6 of 120.315 ppb12,182
WamacCentralia, IL6 of 120.315 ppb1,052
HoffmanHoffman, IL6 of 120.315 ppb500
Hoyleton RwcCentralia, IL6 of 120.315 ppb1,147
W G Murray Development CenterCentralia, IL6 of 120.315 ppb290
Pa Amer Water Company MontroseClarks Summit, PA13 of 130.312 ppb1,890
Pierson Water SupplyPierson, IA1 of 10.300 ppb337
Bucksport Water CompanyConway, SC2 of 40.278 ppb15,297
CoultervilleCoulterville, IL3 of 120.257 ppb1,330
Greenville*Greenville, IL4 of 120.252 ppb8,310
Mulberry GroveMulberry Grove, IL4 of 120.252 ppb650
SmithboroSmithboro, IL4 of 120.252 ppb200
Crosby Municipal Utility DistrictCrosby, TX1 of 10.240 ppb5,130
Havasu Heights Domestic Water Improvement DistrictLake Havasu City, AZ3 of 60.230 ppb614
Lawco MansuraBaton Rouge, LA1 of 10.210 ppb1,878
FayettevilleSwansea, IL4 of 130.204 ppb410
New Baden*New Baden, IL4 of 130.204 ppb4,178
Tritownship Water District*Trenton, IL4 of 130.204 ppb4,025
TrentonTrenton, IL4 of 130.204 ppb3,180
SummerfieldSummerfield, IL4 of 130.204 ppb471
S L M Water Commission*Mascoutah, IL4 of 130.204 ppb345
New Memphis Public Water DistrictNew Memphis, IL4 of 130.204 ppb800
MascoutahMascoutah, IL4 of 130.204 ppb8,754
LebanonLebanon, IL4 of 130.204 ppb4,418
Fsh Water Commission*Freeburg, IL4 of 130.204 ppb317
Hoffman Rural Water DistrictCarlyle, IL5 of 130.200 ppb1,056
Clinton County East Public Water District*Centralia, IL5 of 130.200 ppb1,980
BeckemeyerBeckemeyer, IL5 of 130.200 ppb913
Carlyle*Carlyle, IL5 of 130.200 ppb3,486

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

UtilityLocationTestsAverage levelPeople served
Centralia*Centralia, IL6 of 120.315 ppb12,182
Bucksport Water CompanyConway, SC2 of 40.278 ppb15,297
City of GrapevineGrapevine, TX3 of 30.160 ppb50,631
Reynolds PlantationAtlanta, GA2 of 60.147 ppb13,500
City of Galena ParkGalena Park, TX4 of 40.145 ppb10,293
City of LivingstonLivingston, TX3 of 30.133 ppb15,199
Remington MUD 1Houston, TX6 of 60.130 ppb13,743
Monroe Water System*Monroe, LA5 of 60.128 ppb57,000
City of Baytown*Baytown, TX1 of 10.120 ppb83,701
Wilmington City PWSWilmington, OH2 of 30.120 ppb12,401
City of Graham*Graham, NC3 of 40.118 ppb18,057
City of MebaneMebane, NC3 of 40.118 ppb18,579
City of LewisvilleLewisville, TX4 of 60.115 ppb132,620
Van Wert CityVan Wert, OH2 of 30.103 ppb10,846
Walpole Water DepartmentWalpole, MA9 of 130.103 ppb23,989
Gretna WaterworksGretna, LA3 of 60.103 ppb17,802
City of Deer ParkDeer Park, TX4 of 40.1000 ppb34,495
City of ThomasvilleThomasville, NC3 of 90.1000 ppb27,485
City of MonroeMonroe, NC4 of 120.0992 ppb37,264
E J Water Corp*Dieterich, IL3 of 120.0983 ppb23,944
City of Red OakRed Oak, TX2 of 30.0967 ppb10,934
Speedway Water WorksSpeedway, IN8 of 130.0953 ppb12,473
Harris County Municipal Utility District 285Houston, TX2 of 20.0950 ppb13,158
Langham Creek Utility District*Houston, TX9 of 90.0933 ppb10,482
City of LexingtonLexington, NC3 of 110.0927 ppb19,200
Johnston County - East*Smithfield, NC2 of 50.0920 ppb40,086
City of Mesquite*Mesquite, TX1 of 10.0900 ppb152,020
City of IrvingIrving, TX3 of 30.0867 ppb240,420
Harris County Utility District 6Houston, TX3 of 30.0867 ppb11,262
Harris County Municipal Utility District 368Houston, TX6 of 80.0850 ppb11,835
City of DeSotoDesoto, TX8 of 90.0844 ppb54,060
City of Seagoville*Seagoville, TX8 of 90.0844 ppb17,800
City of DuncanvilleDuncanville, TX8 of 90.0844 ppb39,500
City of CoppellCoppell, TX8 of 90.0844 ppb41,540
City of CarrolltonCarrollton, TX8 of 90.0844 ppb136,170
City of Balch SpringsBalch Springs, TX8 of 90.0844 ppb27,431
Town of AddisonAddison, TX8 of 90.0844 ppb16,661
Dallas Water Utility*Dallas, TX8 of 90.0844 ppb1,321,740
City of Cedar HillCedar Hill, TX8 of 90.0844 ppb48,870
City of Lancaster*Lancaster, TX8 of 90.0844 ppb39,040
City of Glenn HeightsGlenn Heights, TX8 of 90.0844 ppb18,090
City of Farmers BranchFarmers Branch, TX8 of 90.0844 ppb35,991
Mountain Peak SUD*Midlothian, TX3 of 60.0800 ppb16,008
Harris County Municipal Utility District 49Houston, TX2 of 50.0800 ppb10,722
City of Midlothian*Midlothian, TX3 of 60.0800 ppb21,450
City of South HoustonSouth Houston, TX10 of 150.0793 ppb17,397
Harris County MUD 53Houston, TX12 of 150.0793 ppb17,856
Harris County MUD 55 Heritage ParkHouston, TX5 of 60.0767 ppb16,233
City of BedfordBedford, TX1 of 30.0767 ppb49,900
City of EulessEuless, TX1 of 30.0767 ppb61,543

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

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