Metolachlor

Status: No national drinking water standard exists

Metolachlor is a herbicide applied on corn, soybeans and other crops. The EPA has classified metolachlor as a possible human carcinogen.

2017-2019:

FOUND

states detected

518

utilities detected

4.4 million

people served

Health concerns for metolachlor

Cancer

Change in blood chemistry

Harm to the liver

States reporting metolachlor in drinking water

	UTILITIES WITH CONTAMINATION
State	Utilities	People Served
Texas		123	906,701
Kansas		124	794,109
Iowa		64	715,906
Missouri		57	671,345
Wisconsin		21	302,262
South Carolina		9	199,908
Illinois		64	189,277
Maryland		8	159,548
North Carolina		1	134,066
Delaware		11	74,780
Rhode Island		4	67,053
Alabama		3	52,497
Minnesota		2	44,014
Connecticut		1	43,069
Nebraska		10	23,352
New York		6	20,980
Oklahoma		8	10,963
Vermont		2	3,746

LESS

Filtering technologies that reduce metolachlor

Utilities with the highest amounts of metolachlor, 2017-2019

ALL UTILITIES

LARGE UTILITIES

Utility	Location	Tests	Average level	People served
Elk County Rural Water District 2	Howard, KS	2 of 3	7.33 ppb	206
Howard, City of*	Howard, KS	2 of 3	7.33 ppb	602
Shawnee County Rural Water District 3c*	Topeka, KS	6 of 6	3.46 ppb	2,675
City of Topeka*	Topeka, KS	6 of 6	3.46 ppb	165,000
Shawnee County Rural Water District 1c	Auburn, KS	6 of 6	3.46 ppb	4,160
Metro Topeka Airport Authority	Topeka, KS	6 of 6	3.46 ppb	500
Flying Dutchman Mobile Home Park 2	Felton, DE	1 of 1	3.20 ppb	30
Humboldt, City of*	Humboldt, KS	2 of 3	2.73 ppb	1,789
Allen County Rural Water District 10	Chanute, KS	2 of 3	2.73 ppb	125
Rapid Creek Ridge	Iowa City, IA	1 of 1	2.60 ppb	70
Flying Dutchman Mobile Home Park 1	Felton, DE	1 of 1	2.60 ppb	30
Russell, City of	Russell, KS	6 of 6	2.46 ppb	4,463
Erie, City of*	Erie, KS	3 of 3	2.10 ppb	1,085
Neosho County Rural Water District 1c	Erie, KS	3 of 3	2.10 ppb	670
West Delta Water Supply Corporation	Klondike, TX	6 of 8	2.03 ppb	1,416
Gladbrook Water Supply	Gladbrook, IA	3 of 3	1.90 ppb	945
Osawatomie, City of*	Osawatomie, KS	4 of 6	1.87 ppb	4,266
Kenton Heights	Grant, NE	2 of 2	1.80 ppb	35
Great Plains Development Authority	Parsons, KS	3 of 3	1.70 ppb	182
Evansville	Evansville, IL	13 of 23	1.45 ppb	700
Lane, City of	Lane, KS	3 of 3	1.30 ppb	226
Franklin County Rural Water District 6*	Rantoul, KS	3 of 3	1.30 ppb	2,960
Montgomery County Rural Water District 14	Coffeyville, KS	4 of 6	1.12 ppb	330
Labette County Rural Water District 6	Coffeyville, KS	4 of 6	1.12 ppb	1,550
South Coffeyville	South Coffeyville, OK	4 of 6	1.12 ppb	790
Nowata County Rural Water District #7	South Coffeyville, OK	4 of 6	1.12 ppb	1,050
Dearing, City of*	Dearing, KS	4 of 6	1.12 ppb	386
Montgomery County Rural Water District 2c A	South Coffeyville, KS	4 of 6	1.12 ppb	1,113
Coffeyville, City of*	Coffeyville, KS	4 of 6	1.12 ppb	9,366
Flying Dutchman Mobile Home Park 3	Felton, DE	1 of 1	1.10 ppb	81
Marais Des Cygnes Public Utility Authority*	Louisburg, KS	3 of 6	1.05 ppb	1
Paola, City of*	Paola, KS	3 of 6	1.05 ppb	5,670
Peaceable Hill Water District	Brewster, NY	2 of 2	1.000 ppb	440
Brewster Village*	Brewster, NY	2 of 2	1.000 ppb	2,440
Mitchell County Rural Water District 1	Beloit, KS	4 of 7	0.990 ppb	345
Beloit, City of*	Beloit, KS	4 of 7	0.990 ppb	3,726
Chetopa, City of	Chetopa, KS	3 of 4	0.975 ppb	1,035
City of Ottawa*	Ottawa, KS	5 of 6	0.893 ppb	12,267
Princeton, City of*	Princeton, KS	5 of 6	0.893 ppb	271
Franklin County Rural Water District 2	Ottawa, KS	5 of 6	0.893 ppb	400
Atchison County Rural Water District 3	Atchison, KS	4 of 7	0.817 ppb	110
City of Atchison*	Atchison, KS	4 of 7	0.817 ppb	10,636
Atchison County Rural Water District 1	Atchison, KS	4 of 7	0.817 ppb	490
Atchison County Rural Water District 6	Atchison, KS	4 of 7	0.817 ppb	670
Gander Woods Pump District	Dover, DE	1 of 1	0.800 ppb	42
Paradise, City of	Paradise, KS	2 of 3	0.727 ppb	49
Osborne County Rural Water District 2	Natoma, KS	2 of 3	0.727 ppb	55
Brookville, City of	Brookville, KS	2 of 3	0.727 ppb	254
Waldo, City of	Waldo, KS	2 of 3	0.727 ppb	30
Saline County Rural Water District 7*	Assaria, KS	2 of 3	0.727 ppb	355

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

Utility	Location	Tests	Average level	People served
City of Topeka*	Topeka, KS	6 of 6	3.46 ppb	165,000
City of Ottawa*	Ottawa, KS	5 of 6	0.893 ppb	12,267
City of Atchison*	Atchison, KS	4 of 7	0.817 ppb	10,636
Fort Leavenworth American Water Ent Inc	Fort Leavenworth, KS	6 of 12	0.658 ppb	12,934
Leavenworth Water Department*	Leavenworth, KS	6 of 12	0.658 ppb	36,062
City of Olathe*	Olathe, KS	5 of 6	0.637 ppb	139,605
City of Gardner	Gardner, KS	4 of 7	0.389 ppb	21,871
St. Louis City*	St Louis, MO	9 of 18	0.290 ppb	315,685
Thomas Hill PWSD 1*	Moberly, MO	5 of 24	0.225 ppb	10,315
University Water System	Iowa City, IA	2 of 2	0.200 ppb	26,684
Rathbun Regional Water Assn*	Centerville, IA	9 of 9	0.167 ppb	28,215
Maryville*	Maryville, MO	5 of 25	0.155 ppb	11,972
Waukee Water Supply*	Waukee, IA	2 of 2	0.150 ppb	13,790
Clive Water Department	Clive, IA	2 of 2	0.150 ppb	15,447
Des Moines Water Works*	Des Moines, IA	2 of 2	0.150 ppb	233,020
Johnston Municipal Water Supply	Johnston, IA	2 of 2	0.150 ppb	17,306
Urbandale Water Utility	Urbandale, IA	2 of 2	0.150 ppb	39,463
Warren Water District*	Indianola, IA	2 of 2	0.150 ppb	18,045
Town of Elkton*	Elkton, MD	1 of 6	0.135 ppb	15,625
City of Frederick*	Frederick, MD	2 of 14	0.123 ppb	54,000
City of Celina	Celina, TX	2 of 9	0.122 ppb	18,860
City of Corpus Christi*	Corpus Christi, TX	3 of 11	0.114 ppb	325,733
City of Midlothian*	Midlothian, TX	6 of 17	0.1000 ppb	16,728
Cedar Rapids Water Department*	Cedar Rapids, IA	74 of 153	0.0909 ppb	128,201
Easley Combined Util*	Easley, SC	1 of 6	0.0833 ppb	29,967
City of Sulphur Springs*	Sulphur Springs, TX	2 of 6	0.0833 ppb	15,449
Lancaster County Water and Sewer District*	Lancaster, SC	3 of 6	0.0800 ppb	63,258
City of Angleton	Angleton, TX	3 of 13	0.0777 ppb	18,120
Southington Water Department	Southington, CT	7 of 31	0.0697 ppb	43,069
City of Taylor*	Taylor, TX	1 of 6	0.0567 ppb	18,252
Kansas City Board of Public Utilities*	Kansas City, KS	8 of 15	0.0537 ppb	152,958
City of Cedar Hill	Cedar Hill, TX	1 of 6	0.0500 ppb	48,710
St. Elmo-irvington Water Authority	St Elmo, AL	1 of 9	0.0433 ppb	10,020
City of Pampa	Pampa, TX	1 of 21	0.0429 ppb	17,994
Kansas City*	Kansas City, MO	2 of 39	0.0421 ppb	471,767
Belton*	Belton, MO	2 of 39	0.0421 ppb	23,290
Raymore	Raymore, MO	2 of 39	0.0421 ppb	21,167
Raytown Water Company	Raytown, MO	2 of 39	0.0421 ppb	21,135
Rehoboth Beach Water Department*	Rehoboth Beach, DE	1 of 5	0.0420 ppb	30,000
Dewey Beach Water Department	Frankford, DE	1 of 5	0.0420 ppb	22,400
City of Corinth	Corinth, TX	2 of 22	0.0409 ppb	23,568
Denton County FWSD 7 Lantana	Houston, TX	2 of 22	0.0409 ppb	11,169
Mankato	Mankato, MN	1 of 5	0.0400 ppb	42,803
City of Baytown*	Baytown, TX	1 of 6	0.0383 ppb	72,312
Mount Vernon*	Mt. Vernon, IL	2 of 24	0.0346 ppb	15,591
Herrin*	Herrin, IL	2 of 24	0.0346 ppb	12,752
Marion	Marion, IL	2 of 24	0.0346 ppb	17,428
Plover Waterworks	Plover, WI	2 of 3	0.0343 ppb	12,420
City of Donna	Donna, TX	1 of 6	0.0333 ppb	16,176
City of Corsicana*	Corsicana, TX	1 of 12	0.0333 ppb	23,770