EWG INVESTIGATION
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EWG Statement, 03/10/2008
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National Contaminants of Concern
Next Page > | Rank | Contaminant Name | Population Exposed
(of 231,439,195) | Number of Water Systems
(of 39,751) | Number
of States
with Detections
(of 42) |
|---|
| At Any Level | Above Health Limits
See Note | At Any Level | Above Health Limits
See Note |
|---|
| 1 | Total trihalomethanes (TTHMs)
Regulated | 170,113,651 | 116,265,462 | 14,675 | 6,975 | 39 | | Measure of four disinfection by-products | | 2 | Nitrate
Regulated | 164,806,730 | 12,390,279 | 22,363 | 657 | 31 | | Chemical that enters water from fertilizer runoff, leaching septic tanks, and erosion of natural deposits | | 3 | Chloroform
Regulated | 153,506,945 | 78,454,760 | 11,369 | 4,134 | 38 | | Disinfection by-product | | 4 | Bromodichloromethane
Regulated | 147,485,443 | 115,218,832 | 9,966 | 7,298 | 38 | | Disinfection by-product | | 5 | Dibromochloromethane
Regulated | 139,104,583 | 100,373,485 | 9,443 | 7,005 | 38 | | Disinfection by-product | | 6 | Barium (total)
Regulated | 134,841,413 | 827,080 | 18,835 | 177 | 29 | | Mineral from drilling and mining waste runoff; erosion of natrual deposits | | 7 | Bromoform
Regulated | 99,694,236 | 4,363,943 | 6,140 | 726 | 34 | | Disinfection by-product | | 8 | Arsenic (total)
Regulated | 90,097,384 | 90,096,056 | 9,957 | 9,956 | 38 | | Metal that enters water by erosion of natural deposits, runoff from glass and electronics processing | | 9 | Copper
Regulated | 77,074,622 | 4,398,112 | 12,169 | 1,402 | 29 | | contaminant that enters water by corrosion of household plumbing systems; erosion of natural deposits | | 10 | Total haloacetic acids
Regulated | 69,077,841 | 20,251,582 | 2,791 | 935 | 27 | | Measure of disinfection by-products; refers to the sum of the concentrations of dichloroacetic acid, trichloroacetic acid, monochloroacetic acid, monobromoacetic acid and dibromoacetic acid in a water sample. | | 11 | Nitrate & nitrite
Regulated | 66,875,947 | 116,283 | 7,526 | 97 | 15 | | Chemical that enters water from fertilizer runoff, leaching septic tanks, and erosion of natural deposits | | 12 | Alpha particle activity
Regulated | 66,388,504 | 691,892 | 6,632 | 319 | 13 | | From mining waste polluants and natural sources | | 13 | Manganese
Regulated | 59,746,385 | 6,089,914 | 8,182 | 2,273 | 28 | | element from natural deposits as well as industrial use | | 14 | Lead (total)
Regulated | 50,382,986 | 9,619,783 | 7,942 | 2,275 | 33 | | Metal that enters water by corrosion of household plumbing systems; industrial pollutant; erosion of natural deposits | | 15 | Aluminum
Regulated | 47,160,552 | 695,255 | 2,570 | 89 | 13 | | Metal from metal refineries and mining operations | | 16 | Alpha particle activity (excl radon and uranium)
Regulated | 36,052,637 | 296,169 | 6,296 | 219 | 15 | | From mining waste pollutants and natural sources | | 17 | Trichloroacetic acid
Regulated | 35,501,045 | 2,023,732 | 1,689 | 253 | 15 | | Disinfection by-product | | 18 | Radon
Unregulated | 34,833,416 | 12,434,478 | 1,215 | 879 | 16 | | natural (radioactive) breakdown product of uranium in soil, rock and water | | 19 | Selenium (total)
Regulated | 32,638,423 | 2,184,722 | 2,431 | 39 | 7 | | Metal from mining or petrolum refining pollution; erosion of natural deposits | | 20 | Nitrite
Regulated | 28,587,707 | 707,975 | 2,722 | 87 | 22 | | Chemical that enters water from fertilizer runoff, leaching septic tanks, and erosion of natural deposits |
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