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EWG's Tap Water Database

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Simazine

Status: National drinking water standard exists

 

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.

2015:

FOUND
FOUND ABOVE HEALTH GUIDELINES

16

states detected

478

utilities detected

13 million

people served

8

states over health guideline

166

utilities over health guideline

2.1 million

people served over health guideline

Health concerns for simazine

Harm to the developing fetus

Hormone disruption

Harm to the reproductive system

Changes in the nervous system

Changes in brain and behavior

Cancer

State and national drinking water standards and health guidelines

Health Guideline 0.1 ppb

The 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.

ppb = parts per billion.

EPA Maximum Contaminant
Level (MCL) 4 ppb

The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.

ppb = parts per billion.

EPA Maximum Contaminant
Level Goal (MCLG)4 ppb

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppb = parts per billion.

States reporting simazine in drinking water

UTILITIES REPORTING ABOVE HEALTH GUIDELINES UTILITIES WITH CONTAMINATION
State UtilitiesPeople Served UtilitiesPeople Served
Texas47546,0081735,838,013
Ohio9204,406842,469,423
Maryland00102,034,535
Indiana214,902261,028,021
Arizona32756,64532756,645
North Carolina5318,78339566,299
Kentucky0022294,858
Illinois66176,50976198,285
Tennessee466,644566,720
New York158,000158,000
Michigan00133,816
Massachusetts00333,149
Missouri00313,299
South Carolina0012,256
Florida0011,479
New Mexico001120
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Utilities with the highest amounts of simazine, 2015

ALL UTILITIES
LARGE UTILITIES
UtilityLocationTestsAverage levelPeople served
Hillsboro*Hillsboro, IL2 of 40.925 ppb5,600
Pecan Grove MUD*Houston, TX4 of 100.676 ppb14,913
Mount Olive*Mount Olive, IL2 of 40.413 ppb2,150
Springfield Water System*Springfield, TN1 of 10.358 ppb38,472
Effingham*Effingham, IL2 of 40.353 ppb12,384
Bammel Utility District*Houston, TX1 of 10.330 ppb2,550
City of Grapevine*Grapevine, TX1 of 10.310 ppb48,751
Gulf Coast Water Authority Tx City*Texas City, TX1 of 10.240 ppb0
S L M Water Commission*Mascoutah, IL2 of 50.236 ppb300
City of Pflugerville*Pflugerville, TX2 of 20.235 ppb29,922
Bayview Municipal Utility District*Bacliff, TX1 of 10.220 ppb1,830
Galveston County Municipal Utility District 12Hitchcock, TX1 of 10.220 ppb4,542
Galveston County Water Control and Improvement District 12Bellaire, TX1 of 10.220 ppb5,904
Greensburg Municipal Water Works*Greensburg, IN3 of 50.210 ppb12,000
Dallas County Park Cities Municipal Utility District*Dallas, TX1 of 10.210 ppb0
Kinkaid Area Water System*Murphysboro, IL5 of 50.200 ppb1
Mattoon*Mattoon, IL1 of 40.188 ppb19,000
City of Monroe*Monroe, NC1 of 40.187 ppb30,135
Harris County Water Control and Improvement District Fondren Road*Houston, TX2 of 20.180 ppb3,078
Fort Bend County Municipal Utility District 41Houston, TX1 of 10.180 ppb4,167
City of Thomasville*Thomasville, NC1 of 10.180 ppb26,418
City of Sugar Land*Sugar Land, TX5 of 110.176 ppb82,686
Gateway Regional Water Company*Kinmundy, IL1 of 40.170 ppb1
Fort Bend County Municipal Utility District 119*Houston, TX3 of 30.163 ppb5,289
Fort Bend County Municipal Utility District 122*Houston, TX3 of 30.157 ppb3,354
City of Lewisville*Lewisville, TX1 of 20.150 ppb99,480
Warren City PWS*Cortland, OH1 of 10.140 ppb46,832
Fort Bend County Municipal Utility District 50*Houston, TX1 of 10.130 ppb4,218
Jericho Water DistrictSyosset, NY6 of 300.129 ppb58,000
IL American-cairo*Creve Coeur, IL1 of 30.127 ppb3,723

* 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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UtilityLocationTestsAverage levelPeople served
Pecan Grove MUD*Houston, TX4 of 100.676 ppb14,913
Springfield Water System*Springfield, TN1 of 10.358 ppb38,472
Effingham*Effingham, IL2 of 40.353 ppb12,384
City of Grapevine*Grapevine, TX1 of 10.310 ppb48,751
City of Pflugerville*Pflugerville, TX2 of 20.235 ppb29,922
Greensburg Municipal Water Works*Greensburg, IN3 of 50.210 ppb12,000
Mattoon*Mattoon, IL1 of 40.188 ppb19,000
City of Monroe*Monroe, NC1 of 40.187 ppb30,135
City of Thomasville*Thomasville, NC1 of 10.180 ppb26,418
City of Sugar Land*Sugar Land, TX5 of 110.176 ppb82,686
City of Lewisville*Lewisville, TX1 of 20.150 ppb99,480
Warren City PWS*Cortland, OH1 of 10.140 ppb46,832
Jericho Water DistrictSyosset, NY6 of 300.129 ppb58,000
Del-Co Water Company Inc.*Delaware, OH6 of 70.116 ppb141,407
City of Tucson*Tucson, AZ1 of 10.110 ppb675,686
Centralia*Centralia, IL1 of 40.110 ppb14,274
Washington Court House PWSWashington Court House, OH1 of 10.0960 ppb14,100
Fremont CityFremont, OH6 of 60.0945 ppb16,677
Johnston County - West*Wilson Mills, NC1 of 30.0923 ppb45,750
City of South HoustonSouth Houston, TX5 of 70.0886 ppb13,578
Harris County WCID 36*Houston, TX2 of 30.0867 ppb11,065
Johnston County - East*Wilson Mills, NC2 of 40.0845 ppb24,310
Walpole Water Department*Walpole, MA2 of 40.0825 ppb22,830
City of Texas CityTexas City, TX2 of 60.0800 ppb46,081
City of Galena ParkGalena Park, TX2 of 20.0800 ppb10,089
Harris County FWSD 51*Houston, TX2 of 20.0800 ppb10,401
City of Frederick*Frederick, MD1 of 80.0763 ppb54,000
Harris County MUD 102*Houston, TX1 of 10.0700 ppb10,212
Town of Smithfield*Smithfield, NC1 of 30.0670 ppb11,684
Galveston County WCID 1*Dickinson, TX2 of 30.0667 ppb29,280

* 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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