National Water Contaminants of Concern

Top 20 National tap water contaminants of concern

Source

• National Tap Water Quality Database

Summary

• Rows	20
  Columns	8

Categories

Health Science

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Pollution contaminants national pollutants tap water

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• Initial (2.7 kb) Jul 31, 2008

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Data Summary

Showing last 6 rows and first 4 columns

Rank	Contaminant Name	Population Exposed (of 231,439,195) At Any Level	Population Exposed (of 231,439,195) Above Health Limits	Number of Water Systems (of 39,751) At Any Level	Number of Water Systems (of 39,751) Above Health Limits	Number of States with Detections (of 42)	Source
15	Aluminum	47,160,552	695,255	2,570	89	13	Metal from metal refineries and mining operations
16	Alpha particle activity (excl radon and uranium)	36,052,637	296,169	6,296	219	15	From mining waste pollutants and natural sources
17	Trichloroacetic acid	35,501,045	2,023,732	1,689	253	15	Disinfection by-product
18	Radon	34,833,416	12,434,478	1,215	879	16	natural (radioactive) breakdown product of uranium in soil, rock and water
19	Selenium (total)	32,638,423	2,184,722	2,431	39	7	Metal from mining or petrolum refining pollution; erosion of natural deposits
20	Nitrite	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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Chemical that enters water from fertilizer runoff, leaching septic tanks, and erosion of natural deposits Population Exposed (of 231,439,195) At Any Levels by Contaminant Name

Rank by Contaminant Name

Disinfection by-product Population Exposed (of 231,439,195) Above Health Limits by Contaminant Name

Chemical that enters water from fertilizer runoff, leaching septic tanks, and erosion of natural deposits Number of Water Systems (of 39,751) Above Health Limits by Contaminant Name

Column Summaries

Show columns: 1 - 4 5 - 8

Rank see all graphs Max 20 Avg 10 Min 1 Sum 210 Std Dev 5.77

Contaminant Name see all graphs 20 unique values Alpha particle activity … Trichloroacetic acid

Population Exposed (of 231,439,195) At Any Level see all graphs Max 170,113,651 Avg 85,198,500 Min 28,587,707 Sum 1,703,970,000 Std Dev 47649500.00

Population Exposed (of 231,439,195) Above Health Limits see all graphs Max 116,265,462 Avg 28,875,000 Min 116,283 Sum 577,500,000 Std Dev 42049000.00

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