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EWG Statement, 03/10/2008

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NATIONAL SUMMARY

Quality Varies Across the U.S.

CONTAMINANTS DATABASE

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Tap Water Quality Report The State of Missouri 1,452 Water Systems Serving 4,902,770 People

An Environmental Working Group analysis of tap water tests from 1998 through 2003 for 1,452 communities across Missouri shows 74 pollutants were found in drinking water across the state.

Pollution Summary

74 40	16 7	15 9	48 25	17 13	17 11
Total pollutants	Agricultural pollutants	Sprawl and Urban pollutants	Industrial pollutants	Water Treatment and Distribution Byproducts	Naturally occurring pollutants
Number of pollutants detected (1998 - 2003)			Over health based limits

NOTE: Health based limits included in this analysis include enforceable drinking water limits (called Maximum Contaminant Limits, or MCLs) as well as governmental, non-enforceable health guidelines, such as Maximum Contaminant Limit Goals (MCLGs), lifetime health advisory levels, one-day and ten-day advisory levels to protect children from non-cancer health endpoints, and other government-established health guidelines for tap water contaminants.

Health Summary

The federal government has set standards for 80 chemical pollutants in tap water, balancing health concerns and treatment costs.

Contaminants found in state tap water (1998-2003): 74

Total population exposed above health-based limits: 2,266,355

Communities served water with contaminants above health-based limits: 529

Health effects or target organs of contaminants found: Cardiovascular or Blood Toxicity, Cancer, Developmental Toxicity, Endocrine Toxicity, Immunotoxicity, Kidney Toxicity, Gastrointestinal or Liver Toxicity, Neurotoxicity, Reproductive Toxicity, Respiratory Toxicity, and Skin Sensitivity.

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Contaminants found above health based limits: 40

Rank	Contaminant Name	Population Exposed (of 4,902,770 Total)		Number of Water Systems (of 1,452) Total
		At Any Level	Above Health Limits See Note	With Detected	Above Health Limits See Note
1	Copper	2,740,668	15,107	1278	20
		contaminant that enters water by corrosion of household plumbing systems; erosion of natural deposits
2	Barium (total)	2,302,286	12,119	1085	5
		Mineral from drilling and mining waste runoff; erosion of natrual deposits
3	Sulfate	2,233,173	0	966	0
		Substance from natural deposits, industrial processes, and agriculture
4	Nitrate & nitrite	1,696,872	0	738	0
		Chemical that enters water from fertilizer runoff, leaching septic tanks, and erosion of natural deposits
5	Manganese	1,251,020	233,126	541	58
		element from natural deposits as well as industrial use
6	Alpha particle activity	563,438	16,662	481	17
		From mining waste polluants and natural sources
7	Lead (total)	1,205,615	313,505	475	169
		Metal that enters water by corrosion of household plumbing systems; industrial pollutant; erosion of natural deposits
8	Total trihalomethanes (TTHMs)	2,106,849	1,597,394	357	204
		Measure of four disinfection by-products
9	Chloroform	1,969,359	1,415,840	304	147
		Disinfection by-product
10	Dibromochloromethane	2,040,250	1,596,677	291	248
		Disinfection by-product

View Full Table

NOTE: Health based limits included in this analysis include enforceable drinking water limits (called Maximum Contaminant Limits, or MCLs) as well as governmental, non-enforceable health guidelines, such as Maximum Contaminant Limit Goals (MCLGs), lifetime health advisory levels, one-day and ten-day advisory levels to protect children from non-cancer health endpoints, and other government-established health guidelines for tap water contaminants.

Testing Summary

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

Contaminants reported as tested by water suppliers in Missouri		174
	Contaminants tested due to federal law:	90
	Contaminants tested in addition to those required by federal law:	84

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Violations Summary

According to EPA, in 2003 6% of America's public water systems reported one or more violations of a health-based drinking water standard, and 26% reported significant violations of either monitoring and reporting requirements or health-based standards.

Reported violations (1998 - 2003): 4,893

Number of MO systems with violations: 1,053 (72.5%)

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Information on violations is drawn directly from EPA's national violations database in the Agency's Safe Drinking Water Information System. Analyses by others have raised questions about the quality of the information in EPA's database. For the purposes of this investigation, EWG is not showing below or including in our analyses, those violations for individual water suppliers that occurred on days for which the total number of violations assigned by EPA to that water supplier was greater than 20. This criteria was based on common characteristics of incorrect violations data as identified by water utilities, from a review of EPA's violations data by several hundred utilities prior to the release of EWG's investigation.