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EWG's Tap Water Database — 2019 UPDATE

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1,2-Dibromo-3-chloropropane (DBCP)

Three Valleys Municipal Water District

1,2-Dibromo-3-chloropropane is a pesticide fumigant banned in the 1970s after scientists discovered it caused sterility in men who worked with it. The chemical causes cancer in laboratory animals and may cause cancer in people. Read More.

This pesticide breaks down very slowly in the environment. It remains in groundwater and drinking water wells in the agricultural areas where it was sprayed in the past. Men exposed to this pesticide in the fields suffered from infertility and testicular damage, and tended to have fewer male babies.

 

22

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.0346 ppb52ND - 0.0950 ppb
2013ND30ND
20140.0730 ppb330.0430 ppb - 0.120 ppb
20150.0250 ppb21ND - 0.0500 ppb
20160.0148 ppb51ND - 0.0740 ppb
20170.00275 ppb41ND - 0.0110 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.0017 ppb

The EWG Health Guideline of 0.0017 ppb for 1,2-dibromo-3-chloropropane was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL) 0.2 ppb

The legal limit for 1,2-dibromo-3-chloropropane, established in 1991, was based on analytical detection limits at the time that the standard was set. This limit does not fully protect against the risk of cancer due to 1,2-dibromo-3-chloropropane exposure.

ppb = parts per billion

All test results

Date Lab ID Result
2012-04-173761-002-1100ND
2012-05-153761-002-1100ND
2012-06-133761-004-12000.0950 ppb
2012-09-113761-004-08000.0780 ppb
2012-09-113761-002-0000ND
2013-03-053761-002-1040ND
2013-06-113761-002-0830ND
2013-12-173761-002-1000ND
2014-06-103761-004-10300.0430 ppb
2014-09-163761-004-11010.0560 ppb
2014-10-143761-004-10100.120 ppb
2015-03-103761-002-0930ND
2015-06-093761-004-09400.0500 ppb
2016-03-153761-002-0900ND
2016-06-213761-004-10060.0740 ppb
2016-06-213761-002-1030ND
2016-09-133761-002-1000ND
2016-12-133761-002-1020ND
2017-03-213761-004-1040ND
2017-06-213761-004-11000.0110 ppb
2017-06-213761-002-1000ND
2017-09-123761-002-0900ND