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EWG Statement, 03/10/2008

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

1,1-Dichloropropanone is an unregulated by-product of tap water disinfection. No information on potential health impacts for 1,1-Dichloropropanone was identified in standard government and academic sources.

Sources of 1,1-Dichloropropanone:

Water Treatment and Distribution Byproducts (pipes and fixtures, treatment chemicals and byproducts)

An Environmental Working Group analysis of 1,1-Dichloropropanone tests reported by 211 public water suppliers in 3 states shows that between 1998 and 2002, 333 thousand people in 9 communities drank water contaminated with 1,1-Dichloropropanone. No health-based limit has been established by the federal government.1,1-Dichloropropanone remains unregulated in tap water, without a maximum legal limit.

Exposure Summary

333,262 People drinking water contaminated with 1,1-Dichloropropanone 9 Communities served water contaminated with 1,1-Dichloropropanone

Table. 1,1-Dichloropropanone Exposure by State

333 thousand Americans in 2 states were served tap water contaminated with 1,1-Dichloropropanone between 1998 and 2002.

State	Water suppliers with 1,1-Dichloropropanone contamination
	Systems	Population
New Jersey	7	332,226
Pennsylvania	2	1,036
Total	9	333,262

Table. The most polluted communities

333,000 Americans in 9 communities were served tap water contaminated with 1,1-Dichloropropanone between 1998 and 2002

Ranked by highest average 1,1-Dichloropropanone level

Rank	System	Population Served	Positive test results of total reported tests	Average Level (Range)
1	Richland Twp.wa-richland Ct.	938	1 of 1	6.83 ppb (6.83 to 6.83 ppb)
2	Loyalton Water Association Lykens, PA	98	1 of 1	6.82 ppb (6.82 to 6.82 ppb)
3	Mcguire Air Force Base N Hanover Twp, NJ	9,046	1 of 2	5.5 ppb (0 to 11 ppb)
4	Consumers NJ W C Woolwich Woolwich, NJ	1,583	1 of 6	2.75 ppb (0 to 16.5 ppb)
5	Burlington City Water Department Burlington, NJ	9,835	1 of 2	0.85 ppb (0 to 1.69 ppb)
6	Tuckerton Water & Sewer Department Tuckerton, NJ	5,546	1 of 1	0.44 ppb (0.44 to 0.44 ppb)
7	Hightstown Water Departm Hightstown, NJ	5,216	1 of 9	0.25 ppb (0 to 2.29 ppb)
8	NJ American Water Company - Monmout Shrewsbury, NJ	300,000	1 of 11	0.05 ppb (0 to 0.5 ppb)
9	Lawrenceville School Lawrence Twp, NJ	1,000	1 of 10	0.04 ppb (0 to 0.42 ppb)

Testing Summary for 1,1-Dichloropropanone

Water suppliers report an average of 0.9 1,1-Dichloropropanone tests per year. 39,540 water suppliers failed to report any 1,1-Dichloropropanone tests at all.

Are tests routinely required for 1,1-Dichloropropanone by federal law? No Water suppliers reporting tests for 1,1-Dichloropropanone (1998-2002): 211 of 39,751 Average testing rate for water supplier reporting tests (1998-2002): 0.9 per year

1,1-Dichloropropanone Violations

Because 1,1-Dichloropropanone 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-Dichloropropanone, and any level is legal in tap water.