Bromoform

Status: No national drinking water standard exists

Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

2017-2019:

FOUND

FOUND ABOVE HEALTH GUIDELINES

states detected

15,497

utilities detected

157 million

people served

states over health guideline

11,193

utilities over health guideline

96 million

people served over health guideline

Health concerns for bromoform

Cancer

Harm to reproduction and child development

Change to fetal growth and development

State and national drinking water standards and health guidelines

EWG Health Guideline 0.5 ppb

The EWG Health Guideline of 0.5 ppb for bromoform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

States reporting bromoform in drinking water

	UTILITIES REPORTING ABOVE HEALTH GUIDELINES			UTILITIES WITH CONTAMINATION
State	Utilities	People Served		Utilities	People Served
California		897	25,703,750			1,100	31,125,206
Texas		2,560	20,182,020			3,109	25,527,199
New York		592	10,060,152			830	15,775,824
Ohio		643	6,227,322			898	9,150,498
Pennsylvania		468	2,436,659			690	7,537,938
New Jersey		192	3,001,745			352	7,283,087
Colorado		325	1,750,338			462	3,972,357
Illinois		449	1,951,690			608	3,951,431
North Carolina		231	1,829,834			283	3,714,977
Wisconsin		125	863,844			298	3,111,666
Virginia		87	201,063			189	2,961,116
Massachusetts		104	1,685,671			184	2,934,350
Louisiana		433	1,834,986			585	2,922,285
Oklahoma		406	1,911,581			559	2,908,471
Missouri		261	665,029			422	2,778,718
Nevada		62	2,312,060			88	2,749,112
Utah		90	766,638			173	2,464,669
Washington		316	506,808			452	2,210,646
New Mexico		274	1,654,053			336	1,863,600
Iowa		314	1,239,227			438	1,819,718
Kansas		555	1,415,198			686	1,690,133
Georgia		165	464,024			304	1,680,390
Indiana		27	558,003			51	1,653,818
Michigan		151	573,433			266	1,585,106
Connecticut		79	192,683			149	1,476,139
Minnesota		104	813,928			169	1,426,437
Hawaii		71	1,253,089			82	1,391,813
Nebraska		103	631,805			138	1,276,899
Alabama		38	243,634			85	970,494
South Carolina		46	295,594			81	850,154
Arizona		125	734,808			138	761,215
Delaware		27	199,214			48	744,455
West Virginia		85	288,676			169	736,271
Mississippi		161	539,998			170	713,536
Tennessee		15	167,653			25	650,153
Arkansas		154	465,609			199	606,713
North Dakota		86	122,004			106	344,906
New Hampshire		71	107,368			141	343,086
Idaho		5	59,747			10	309,722
Maryland		36	52,608			57	254,454
Wyoming		89	168,141			108	226,636
Rhode Island		8	94,117			15	213,100
Montana		71	49,930			103	151,884
Vermont		41	34,303			74	83,981
Kentucky		5	118,224			4	70,859
Alaska		36	34,056			46	70,152
Maine		9	6,352			16	17,969
South Dakota		1	296			1	296

LESS

Filtering technologies that reduce bromoform

Utilities with the highest amounts of bromoform, 2017-2019

ALL UTILITIES

LARGE UTILITIES

Utility	Location	Tests	Average level	People served
Litroe Water System	Marion, LA	94 of 94	179.3 ppb	369
Town of Plain Dealing Water System	Plain Dealing, LA	82 of 82	169.5 ppb	2,733
Pleasant Hills-crossroads Water Systems	Joyce, LA	102 of 106	160.4 ppb	840
Wards Chapel Water System	Farmerville, LA	92 of 98	150.9 ppb	1,350
Linville-haile Water System	Marion, LA	94 of 96	145.6 ppb	1,635
Country Estates Water System South	West Monroe, LA	20 of 20	144.1 ppb	600
Jones Mcginty Water System	Jones, LA	94 of 96	141.2 ppb	801
Concord Water System	Marion, LA	96 of 96	126.9 ppb	426
Marion Water System*	Marion, LA	92 of 94	120.6 ppb	1,146
Country Estates Water System North	West Monroe, LA	66 of 72	117.0 ppb	597
Holmesville Water System*	Downsville, LA	98 of 98	113.5 ppb	2,310
Rocky Branch Water System	Farmerville, LA	88 of 96	111.4 ppb	1,410
Union Parish Waterworks District 1	Farmerville, LA	70 of 78	108.7 ppb	1,626
Sardis Water System	Gilbert, LA	96 of 102	104.5 ppb	1,404
West Sterlington Water System	Sterlington, LA	28 of 32	103.8 ppb	978
Chesapeake Shores	Rockville, VA	4 of 4	102.8 ppb	56
Clay Water Supply Corporation	Dripping Springs, TX	23 of 24	102.0 ppb	156
Bel-di-gil Water System	Belcher, LA	96 of 100	96.7 ppb	1,132
Darbonne Ws North	Bernice, LA	68 of 70	91.4 ppb	3,186
Mountain Park Public Works Authority	Mountain Park, OK	22 of 22	90.2 ppb	473
Ramsey Water System	West Monroe, LA	44 of 72	86.9 ppb	60
Lincoln Hills Subdivision Ws	West Monroe, LA	44 of 76	83.3 ppb	150
Tri-water System	Farmerville, LA	76 of 76	83.2 ppb	1,245
Randolph Water System	Junction City, LA	96 of 96	82.9 ppb	222
Pleasant Valley Mobile Home Park	Dundee, NY	10 of 10	82.5 ppb	39
Darling Water Association	Darling, MS	1 of 1	81.6 ppb	240
Lee County Water*	Marianna, AR	43 of 43	81.1 ppb	4,813
Moro Waterworks	Moro, AR	39 of 39	80.6 ppb	180
Wildwood Mobile Home Park Ws	West Monroe, LA	42 of 70	79.6 ppb	72
Pecan Lake Subdivision Ws	West Monroe, LA	44 of 72	75.4 ppb	57
Hidden Oaks Subdivision Ws	West Monroe, LA	44 of 72	74.3 ppb	315
Point Wilhite Ws*	Downsville, LA	118 of 118	74.2 ppb	1,950
Salem Water System	Farmerville, LA	74 of 86	73.3 ppb	753
Indiahoma Public Works Authority	Indiahoma, OK	22 of 24	70.4 ppb	350
Better Waterworks Water System*	West Monroe, LA	44 of 92	70.4 ppb	2,160
Hope Ditch Company	Brighton, CO	5 of 5	68.7 ppb	63
Village of Calvin Water System	Calvin, LA	92 of 102	67.3 ppb	591
Morgan Chapel Water Association	Sturgis, MS	1 of 1	67.3 ppb	528
Las Deltas Mutual Water System	Firebaugh, CA	9 of 9	64.9 ppb	375
Bradley Water Association	Starkville, MS	1 of 1	64.4 ppb	442
Town of Sturgis	Sturgis, MS	1 of 1	64.0 ppb	832
Rowena Water Supply Corporation	Rowena, TX	24 of 24	61.8 ppb	480
New London Water	Strong, AR	49 of 55	61.6 ppb	802
Wake Forest Water Association	Sturgis, MS	1 of 1	61.5 ppb	650
City of Moulton	Moulton, TX	53 of 53	61.1 ppb	907
Hiwanee Water Association #2	Waynesboro, MS	39 of 44	60.3 ppb	853
Matagorda County Water Control and Improvement District 2	Sargent, TX	10 of 13	59.4 ppb	471
Tipton	Tipton, OK	41 of 41	59.3 ppb	916
Oaks At Houston Point	Houston, TX	24 of 24	58.7 ppb	45
Mendon	Gurnee, MI	4 of 6	58.0 ppb	920

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

Utility	Location	Tests	Average level	People served
Military Highway WSC - Las Rusias WTP	Progreso, TX	93 of 94	33.4 ppb	14,292
Brownville Water System	West Monroe, LA	102 of 112	32.1 ppb	10,872
Altus*	Altus, OK	102 of 102	31.4 ppb	21,477
Hudson Water Supply Corporation	Lufkin, TX	53 of 53	30.6 ppb	10,211
City of Mendota	Mendota, CA	84 of 90	29.9 ppb	11,104
West Hwy 80 Ark Road WS	West Monroe, LA	156 of 196	29.1 ppb	13,386
City of Midland	Midland, TX	182 of 199	27.0 ppb	132,950
Town of Discovery Bay	Discovery Bay, CA	105 of 109	26.2 ppb	13,500
City of Hollister	Hollister, CA	119 of 121	25.9 ppb	36,108
Texas A&M University Main Campus	College Station, TX	105 of 106	23.4 ppb	62,500
Nueces County WCID 3*	Robstown, TX	99 of 102	23.2 ppb	14,607
Naval Base Ventura County, Port Hueneme	Point Mugu, CA	104 of 104	22.9 ppb	11,500
El Dorado Waterworks*	El Dorado, AR	101 of 104	22.6 ppb	17,932
West Monroe Water System	West Monroe, LA	196 of 204	22.5 ppb	15,930
City of Hanford	Hanford, CA	63 of 88	22.0 ppb	55,880
South Island PSD	Hilton Head Island, SC	91 of 92	21.0 ppb	18,299
Coalinga	Coalinga, CA	107 of 107	20.8 ppb	19,362
City of Mercedes*	Mercedes, TX	104 of 104	20.7 ppb	15,700
Port Hueneme Water Department*	Port Hueneme, CA	60 of 60	20.5 ppb	21,887
Laguna Madre Water District	Port Isabel, TX	106 of 107	20.4 ppb	19,908
Ferndale*	Ferndale, WA	33 of 33	20.3 ppb	14,300
City of Mineral Wells*	Mineral Wells, TX	102 of 102	20.2 ppb	14,826
City of Lemoore	Lemoore, CA	89 of 113	19.5 ppb	24,945
McAllen Public Utility	Mcallen, TX	207 of 207	19.1 ppb	173,388
City of Abilene*	Abilene, TX	208 of 209	19.1 ppb	123,886
Eunice Water System (LAWCO)	Baton Rouge, LA	192 of 198	18.9 ppb	15,753
West Des Moines Water Works	West Des Moines, IA	188 of 192	18.8 ppb	56,609
City of San Angelo*	San Angelo, TX	201 of 209	18.6 ppb	100,450
City of Pharr	Pharr, TX	198 of 198	18.6 ppb	77,320
Slippery Rock Municipal Authority	Slippery Rock, PA	31 of 31	18.0 ppb	15,778
City of Edinburg	Edinburg, TX	204 of 204	18.0 ppb	85,224
City of Abbeville Water System	Abbeville, LA	186 of 198	17.5 ppb	15,012
City of San Benito	San Benito, TX	93 of 94	17.1 ppb	24,250
City of Minot*	Minot, ND	96 of 96	17.0 ppb	48,743
U.S. Air Force Luke Air Force Base	Luke Afb, AZ	11 of 11	17.0 ppb	10,708
Fort Dodge Water Supply*	Fort Dodge, IA	57 of 60	17.0 ppb	25,206
City of San Juan	San Juan, TX	108 of 108	16.9 ppb	30,027
Military Highway WSC - Progreso	Progreso, TX	90 of 90	16.9 ppb	11,136
City of Mission	Mission, TX	108 of 108	16.3 ppb	77,058
Fond Du Lac Waterworks	Fond Du Lac, WI	119 of 120	16.2 ppb	42,000
Orange County WCID 1	Vidor, TX	110 of 112	15.8 ppb	16,448
Marco Rural Water Company*	Marion, SC	69 of 92	15.6 ppb	15,082
Ponca City Mun Water*	Ponca City, OK	124 of 124	15.2 ppb	27,155
Harlingen Water Works System*	Harlingen, TX	198 of 203	14.3 ppb	85,900
Morris	Morris, IL	26 of 26	14.2 ppb	13,926
Ector County Utility District	Odessa, TX	195 of 198	14.2 ppb	15,300
City of Odessa*	Odessa, TX	195 of 198	14.2 ppb	97,802
Southwest Ouachita Waterworks Inc.	West Monroe, LA	98 of 118	14.1 ppb	10,092
Lemoore Naval Air Station	Nas Lemoore, CA	114 of 118	13.9 ppb	11,500
Agua SUD	Mission, TX	113 of 114	13.8 ppb	46,872