EWG INVESTIGATION

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EWG Statement, 03/10/2008

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NATIONAL SUMMARY

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Status: Unregulated - EPA has not established a maximum legal limit in tapwater for this contaminant.

1,1-Dichloropropene is a industrial solvent; no information on specific uses is available in standard government and industry sources. No information on potential health impacts for 1,1-Dichloropropene was identified in standard government and academic sources.

Sources of 1,1-Dichloropropene:

Industry

An Environmental Working Group analysis of 1,1-Dichloropropene tests reported by 25,421 public water suppliers in 37 states shows that between 1998 and 2003, 33 thousand people in 5 communities drank water contaminated with 1,1-Dichloropropene. No health-based limit has been established by the federal government.1,1-Dichloropropene remains unregulated in tap water, without a maximum legal limit.

Exposure Summary

33,388 People drinking water contaminated with 1,1-Dichloropropene 5 Communities served water contaminated with 1,1-Dichloropropene

Table. 1,1-Dichloropropene Exposure by State

33 thousand Americans in 4 states were served tap water contaminated with 1,1-Dichloropropene between 1998 and 2003.

State	Water suppliers with 1,1-Dichloropropene contamination
	Systems	Population
Tennessee	1	17,316
North Carolina	2	9,384
California	1	4,988
Washington	1	1,700
Total	5	33,388

Table. The most polluted communities

33,000 Americans in 5 communities were served tap water contaminated with 1,1-Dichloropropene between 1998 and 2003

Ranked by highest average 1,1-Dichloropropene level

Rank	System	Population Served	Positive test results of total reported tests	Average Level (Range)
1	Moab Irrigation District #20 Newman Lake, WA	1,700	1 of 2	0.25 ppb (0 to 0.5 ppb)
2	Town of Gibsonville Water Gibsonville, NC	4,662	1 of 7	0.24 ppb (0 to 1.7 ppb)
3	Gustine City Gustine, CA	4,988	1 of 8	0.19 ppb (0 to 1.5 ppb)
4	Town of Longview Water Longview, NC	4,722	1 of 5	0.12 ppb (0 to 0.58 ppb)
5	Winchester Water System Winchester, TN	17,316	1 of 19	0.12 ppb (0 to 2.2 ppb)

Testing Summary for 1,1-Dichloropropene

Water suppliers report an average of 0.6 1,1-Dichloropropene tests per year. 14,330 water suppliers failed to report any 1,1-Dichloropropene tests at all.

Are tests routinely required for 1,1-Dichloropropene by federal law? No Water suppliers reporting tests for 1,1-Dichloropropene (1998-2003): 25,421 of 39,751 Average testing rate for water supplier reporting tests (1998-2003): 0.6 per year

1,1-Dichloropropene Violations

Because 1,1-Dichloropropene is unregulated in tap water, no violations are recorded in EPA's violations database, the Safe Drinking Water Information System. Under the federal tap water law, water suppliers are not required to routinely test for 1,1-Dichloropropene, and any level is legal in tap water.