The Power of Information

National Drinking Water Database


Missouri


1,506 systems serving 5,184,785 people

This drinking water quality report shows results of tests conducted by water utilities in Missouri, provided to the Environmental Working Group (EWG) by the Missouri Department of Natural Resources- Public Drinking Water Program. It is part of EWG's national database that includes 47,667 drinking water utilities and 20 million test results from 45 states and the District of Columbia. Water utilities nationwide detected more than 300 pollutants between 2004 and 2009. More than half of these chemicals are unregulated, legal in any amount. Despite this widespread contamination, the federal government invests few resources in protecting rivers, reservoirs, and groundwater from pollution in the first place. The information below summarizes drinking water quality for this state.



 
Chemicals
Water Utilities
Population Served
Detected Chemicals
109
1,506
5,184,005
Exceed health guidelines*
39
1,489
5,181,790
Exceed Legal Limits*
24
372
1,339,315
Unregulated chemicals detected
45
470
2,293,139
* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

39 Contaminants Exceeding Health Based Limits

Contaminants detected in Missouri drinking water above health guidelines, according to an Environmental Working Group analysis of data obtained from state water authorities

Contaminant
Population
Number of Systems
At Any Level Above Health Limits At Any Level Above Health Limits
Bromodichloromethane3,771,4003,771,400652652
Dichloroacetic acid3,497,6173,497,617483483
Total trihalomethanes (TTHMs)4,583,5733,457,231670437
Lead (total)3,430,9293,430,9291,3771,377
Chloroform3,732,6573,050,059694403
Total haloacetic acids (HAAs)3,034,8193,030,354418411
Alpha particle activity2,795,6682,795,668890890
Dibromochloromethane2,398,0692,258,628620555
Radium-2281,832,1321,832,132307307
Bromoform1,622,7851,622,785415415

Water Utilities in Missouri Reporting Chemicals Exceeding Health Guidelines

Water utilities in Missouri reporting chemicals exceeding health guidelines, according to an Environmental Working Group analysis of data obtained from state water authorities, include:

System
Population
Chemicals tested
Chemicals found
Chemicals exceeding
health guidelines
Branson9,5002203115
Harrison Co Pwsd #23,5002212515
Sedalia20,3392202614
Boonville8,2022213114
Linn Livingston Co Pwsd #31,3001333114
Bates Co Pwsd #21,4922182414
Plattsburg2,3542212614
Maysville1,1002213014
Hamilton1,7502202814
Drexel1,2002192314
Jefferson County Water Authority251362513
St Charles56,3391342413
MO American Joplin50,7001332713
Park Hills12,5551362313
Fisk4301342713
Chaffee3,0591342413
Cape Girardeau36,7012202913
Howard Co Cons Pwsd #11,8351332213
Middle Fork Water Co252212313
Harrison Co Pwsd #19001332413

Sources of Missouri Drinking Water Contaminants

The contaminants identified in Missouri drinking water come from a wide variety of sources, including agriculture, industry, water treatment plants, and polluted storm runoff from urban areas.

109Total Contaminants Detected (2004 - 2009)
25Agricultural Pollutants
(pesticides, fertilizer, factory farms)

Nitrate, Nitrate & nitrite, Arsenic (total), Selenium (total), Atrazine, Ethylbenzene, Cyanide, Simazine, 1,2-Dichloropropane, Metolachlor, p-Dichlorobenzene, Bromomethane, Monochlorobenzene (Chlorobenzene), o-Dichlorobenzene, Oxamyl (Vydate), Methoxychlor, 3-Hydroxycarbofuran, Aldicarb sulfoxide, Methomyl, m-Dichlorobenzene, Aldicarb, Carbaryl, Metribuzin, Aldrin, Chlorneb

27Sprawl and Urban Pollutants
(road runoff, lawn pesticides, human waste)

Nitrate, Copper, Nitrate & nitrite, Lead (total), Arsenic (total), Tetrachloroethylene, MTBE, Xylenes (total), Cadmium (total), Antimony (total), Mercury (total inorganic), m- & p- Xylene, Dichloromethane (methylene chloride), Cyanide, o-Xylene, Benzene, Silver (total), Trichlorofluoromethane, p-Dichlorobenzene, Di-n-butylphthalate, Naphthalene, n-Propylbenzene, Bromobenzene, Carbaryl, tert-Butylbenzene, sec-Butylbenzene, Chlorneb

78Industrial Pollutants

Nitrate, Nitrate & nitrite, Barium (total), Lead (total), Arsenic (total), Manganese, Radium-228, Radium-226, Alpha particle activity, Alpha particle activity (excl radon and uranium), Combined Radium (-226 & -228), Gross beta particle activity (pCi/L), Combined Uranium (pCi/L), Tetrachloroethylene, Trichloroethylene, Chromium (total), Combined Uranium (mg/L), Aluminum, Selenium (total), MTBE, Xylenes (total), cis-1,2-Dichloroethylene, Chlorite, 1,1-Dichloroethylene, Di(2-ethylhexyl) phthalate, 1,2,3-Trichloropropane, Carbon tetrachloride, Ethylbenzene, Toluene, 1,1,1-Trichloroethane, Cadmium (total), Dichlorodifluoromethane, Antimony (total), Mercury (total inorganic), 1,1-Dichloroethane, m- & p- Xylene, Chloromethane, Dichloromethane (methylene chloride), Cyanide, o-Xylene, Thallium (total), 1,2-Dichloroethane, Benzene, 1,2-Dichloropropane, Silver (total), Trichlorofluoromethane, Vinyl chloride, p-Dichlorobenzene, Styrene, Di-n-butylphthalate, Naphthalene, Monochlorobenzene (Chlorobenzene), 1,2,4-Trimethylbenzene, Pentachlorophenol, Dibromomethane, Bromochloromethane, 1,1,2-Trichloroethane, Chloroethane, 1,2,4-Trichlorobenzene, Isopropylbenzene, 1,3,5-Trimethylbenzene, n-Propylbenzene, 1,2,3-Trichlorobenzene, o-Chlorotoluene, p-Isopropyltoluene, 1,1,1,2-Tetrachloroethane, Bromobenzene, n-Butylbenzene, m-Dichlorobenzene, tert-Butylbenzene, sec-Butylbenzene, 2,2-Dichloropropane, 1,1,2,2-Tetrachloroethane, p-Chlorotoluene, cis-1,3-Dichloropropene, 1,3-Dichloropropane, trans-1,3-Dichloropropene, 2,6-Dinitrotoluene

24Water Treatment and Distribution Byproducts
(pipes and fixtures, treatment chemicals and byproducts)

Total trihalomethanes (TTHMs), Total haloacetic acids (HAAs), Chloroform, Bromodichloromethane, Dibromochloromethane, Dichloroacetic acid, Trichloroacetic acid, Bromoform, Dibromoacetic acid, Monochloroacetic acid, Bromochloroacetic acid, Monobromoacetic acid, Chlorite, Di(2-ethylhexyl) phthalate, Bromodichloroacetic acid, Cadmium (total), Chloromethane, Vinyl chloride, Dibromomethane, Bromochloromethane, Chloroethane, Chlorodibromoacetic acid, m-Dichlorobenzene, Tribromoacetic acid

22Naturally Occurring
(naturally present but increased for lands denuded by sprawl, agriculture, or industrial development)

Nitrate, Copper, Nitrate & nitrite, Barium (total), Lead (total), Arsenic (total), Manganese, Radium-228, Radium-226, Alpha particle activity, Alpha particle activity (excl radon and uranium), Combined Radium (-226 & -228), Gross beta particle activity (pCi/L), Combined Uranium (pCi/L), Chromium (total), Combined Uranium (mg/L), Aluminum, Selenium (total), Mercury (total inorganic), Chloromethane, Cyanide, Silver (total)

46Unregulated Contaminants
EPA has not established a maximum legal limit in tapwater for these contaminants

Lead (total), Carbaryl, Methomyl, p-Isopropyltoluene, Aldicarb sulfoxide, Metolachlor, Aldicarb, 3-Hydroxycarbofuran, Chloromethane, Dichlorodifluoromethane, Bromomethane, Chloroethane, Trichlorofluoromethane, trans-1,3-Dichloropropene, cis-1,3-Dichloropropene, Naphthalene, MTBE, 2,6-Dinitrotoluene, Di-n-butylphthalate, Aldrin, Dibromomethane, 1,3-Dichloropropane, 1,2,3-Trichloropropane, 2,2-Dichloropropane, 1,2,4-Trimethylbenzene, 1,2,3-Trichlorobenzene, n-Butylbenzene, 1,3,5-Trimethylbenzene, tert-Butylbenzene, sec-Butylbenzene, Bromochloromethane, Bromochloroacetic acid, Metribuzin, o-Chlorotoluene, p-Chlorotoluene, m-Dichlorobenzene, 1,1-Dichloroethane, 1,1,1,2-Tetrachloroethane, 1,1,2,2-Tetrachloroethane, Bromobenzene, Isopropylbenzene, n-Propylbenzene, Bromodichloroacetic acid, Chlorodibromoacetic acid, Tribromoacetic acid, Chlorneb


Testing Summary for Missouri

The federal government has set standards for some of the pollutants found in tap water supplies.

Contaminants reported as tested by water suppliers in Missouri287
 Contaminants tested due to federal law: 110
 Contaminants tested in addition to those required by federal law: 177

Violation Summary for Missouri

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards in Missouri since 2004

Violation TypeNumber of Violations
Failure to monitor regularly1,413
Failure to monitor, Routine Major (Coliform bacteria)1,045
Maximum contaminant level, Monthly (Coliform bacteria)1,016
Over maximum contaminant level, Average899
Failure to report information to the public or state agency in the Consumer Confidence Report432
Failure to monitor, Routine Minor (Coliform bacteria)398
Public Notification Violation for National Primary Drinking Water Regulations327
Follow-up and Routine Tap Sampling117
Inadequate reporting of information to the public86
Failure to monitor, Repeat Major (Coliform bacteria)58
Treatment Technique Precursor Removal57
Maximum contaminant level, Acute (Coliform bacteria)51
Excess Turbidity at 0.3 NTU48
Initial Tap Sampling for Lead and Copper41
Failure to monitor, Repeat Minor (Coliform bacteria)34
Monitoring and Reporting Disinfection Byproduct Rule28
Filter Turbidity Reporting20
Improper Treatment Techniques16
Excess Turbidity at 1 NTU8
Acute maximum residual disinfectant level4
Treatment Technique (Surface Water Treatment Rule)2
Failure to notify public of violation2
Other Non-National Primary Drinking Water Regulations Potential Health Risks1
Failure to notify state agency1
Failure to monitor or report, Routine/Repeat (Indicators of microbial or virus contamination)1