EWG INVESTIGATION

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EWG Statement, 03/10/2008

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NATIONAL SUMMARY

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CONTAMINANTS DATABASE

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

2,2-Dichloropropane is an intermediate used in chemical manufacturing. No information on potential health impacts for 2,2-Dichloropropane was identified in standard government and academic sources.

Sources of 2,2-Dichloropropane:

Industry

An Environmental Working Group analysis of 2,2-Dichloropropane tests reported by 25,420 public water suppliers in 37 states shows that between 1998 and 2003, 254 thousand people in 12 communities drank water contaminated with 2,2-Dichloropropane. No health-based limit has been established by the federal government.2,2-Dichloropropane remains unregulated in tap water, without a maximum legal limit.

Exposure Summary

253,772 People drinking water contaminated with 2,2-Dichloropropane 12 Communities served water contaminated with 2,2-Dichloropropane

Table. 2,2-Dichloropropane Exposure by State

254 thousand Americans in 6 states were served tap water contaminated with 2,2-Dichloropropane between 1998 and 2003.

State	Water suppliers with 2,2-Dichloropropane contamination
	Systems	Population
Delaware	2	200,801
California	1	24,050
Tennessee	1	17,569
North Carolina	6	9,302
Washington	1	1,700
Missouri	1	350
Total	12	253,772

Table. The most polluted communities

254,000 Americans in 12 communities were served tap water contaminated with 2,2-Dichloropropane between 1998 and 2003

Ranked by highest average 2,2-Dichloropropane level

Rank	System	Population Served	Positive test results of total reported tests	Average Level (Range)
1	City of Claremont Water Claremont, NC	1,816	1 of 4	4.75 ppb (0 to 19 ppb)
2	Dayton Water Dept Dayton, TN	17,569	1 of 5	4 ppb (0 to 20 ppb)
3	Stonebridge Village Branson, MO	350	1 of 3	0.47 ppb (0 to 1.4 ppb)
4	Moab Irrigation District #20 Newman Lake, WA	1,700	1 of 2	0.25 ppb (0 to 0.5 ppb)
5	Ridgeway Courts Greensboro, NC	53	1 of 5	0.22 ppb (0 to 1.1 ppb)
6	Washington County Water System Plymouth, NC	5,656	1 of 8	0.2 ppb (0 to 1.6 ppb)
7	Cedar Valley Water System Denver, NC	132	1 of 11	0.17 ppb (0 to 1.89 ppb)
8	Heavenly Mtn Resort - Village Boone, NC	30	1 of 11	0.11 ppb (0 to 1.2 ppb)
9	Town of Aulander Water Aulander, NC	1,615	1 of 9	0.09 ppb (0 to 0.8 ppb)
10	City of Atwater Water Atwater, CA	24,050	1 of 15	0.07 ppb (0 to 1.1 ppb)

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Testing Summary for 2,2-Dichloropropane

Water suppliers report an average of 0.6 2,2-Dichloropropane tests per year. 14,331 water suppliers failed to report any 2,2-Dichloropropane tests at all.

Are tests routinely required for 2,2-Dichloropropane by federal law? No Water suppliers reporting tests for 2,2-Dichloropropane (1998-2003): 25,420 of 39,751 Average testing rate for water supplier reporting tests (1998-2003): 0.6 per year

2,2-Dichloropropane Violations

Because 2,2-Dichloropropane 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 2,2-Dichloropropane, and any level is legal in tap water.