Bromodichloromethane
Watertown City
Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | 5.16 ppb | 34 | 33 | ND - 11.0 ppb |
2015 | 4.35 ppb | 48 | 48 | 1.20 ppb - 7.70 ppb |
2016 | 4.92 ppb | 49 | 49 | 2.10 ppb - 11.0 ppb |
2017 | 4.89 ppb | 50 | 48 | ND - 10.00 ppb |
2018 | 3.99 ppb | 48 | 48 | 1.60 ppb - 8.40 ppb |
2019 | 4.38 ppb | 48 | 48 | 1.70 ppb - 10.00 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.06 ppb
The EWG Health Guideline of 0.06 ppb for bromodichloromethane was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
ppb = parts per billion
All test results
Date | Lab ID | Result |
---|---|---|
2014-02-05 | 1401657-012 | 1.90 ppb |
2014-02-05 | 1401657-011 | 1.90 ppb |
2014-02-05 | 1401657-010 | 2.20 ppb |
2014-02-05 | 1401657-007 | 3.20 ppb |
2014-02-05 | 1401657-013 | ND |
2014-04-02 | 1404398-009 | 3.70 ppb |
2014-05-07 | 1406257-011 | 5.20 ppb |
2014-05-07 | 1406257-012 | 5.50 ppb |
2014-05-07 | 1406257-001 | 6.40 ppb |
2014-05-07 | 1406257-004 | 5.30 ppb |
2014-07-16 | 1410755-011 | 8.30 ppb |
2014-07-16 | 1410755-012 | 7.40 ppb |
2014-07-16 | 1410755-010 | 8.60 ppb |
2014-07-16 | 1410755-007 | 11.0 ppb |
2014-08-06 | 1412351-007 | 8.70 ppb |
2014-08-06 | 1412351-012 | 6.50 ppb |
2014-08-06 | 1412351-011 | 6.50 ppb |
2014-08-06 | 1412351-010 | 7.10 ppb |
2014-09-10 | 1414832-009 | 6.90 ppb |
2014-09-10 | 1414832-011 | 5.40 ppb |
2014-09-10 | 1414832-008 | 5.80 ppb |
2014-09-10 | 1414832-012 | 5.70 ppb |
2014-10-08 | 1416618-012 | 4.70 ppb |
2014-10-08 | 1416618-010 | 4.40 ppb |
2014-10-08 | 1416618-011 | 4.30 ppb |
2014-10-08 | 1416618-007 | 6.00 ppb |
2014-11-05 | 1418303-010 | 4.80 ppb |
2014-11-05 | 1418303-007 | 6.20 ppb |
2014-11-05 | 1418303-011 | 3.80 ppb |
2014-11-05 | 1418303-012 | 4.30 ppb |
2014-12-03 | 1419724-012 | 3.40 ppb |
2014-12-03 | 1419724-011 | 2.70 ppb |
2014-12-03 | 1419724-008 | 3.00 ppb |
2014-12-03 | 1419724-009 | 4.80 ppb |
2015-01-14 | 1500772-010 | 2.70 ppb |
2015-01-14 | 1500772-012 | 2.00 ppb |
2015-01-15 | 1500772-011 | 1.80 ppb |
2015-01-15 | 1500772-007 | 3.30 ppb |
2015-02-04 | 1501522-011 | 1.70 ppb |
2015-02-04 | 1501522-008 | 2.80 ppb |
2015-02-04 | 1501522-012 | 1.80 ppb |
2015-02-04 | 1501522-009 | 2.90 ppb |
2015-03-04 | 1502825-010 | 2.10 ppb |
2015-03-04 | 1502825-011 | 1.40 ppb |
2015-03-04 | 1502825-012 | 1.20 ppb |
2015-03-04 | 1502825-007 | 2.80 ppb |
2015-04-08 | 1504564-012 | 3.50 ppb |
2015-04-08 | 1504564-010 | 3.90 ppb |
2015-04-08 | 1504564-011 | 3.30 ppb |
2015-04-08 | 1504564-007 | 3.90 ppb |
2015-05-06 | 1506084-012 | 5.80 ppb |
2015-05-06 | 1506084-010 | 5.80 ppb |
2015-05-06 | 1506084-007 | 5.70 ppb |
2015-05-06 | 1506084-011 | 5.60 ppb |
2015-06-03 | 1507791-012 | 4.30 ppb |
2015-06-03 | 1507791-010 | 4.50 ppb |
2015-06-03 | 1507791-011 | 6.20 ppb |
2015-06-03 | 1507791-007 | 5.40 ppb |
2015-07-08 | 1510103-011 | 6.80 ppb |
2015-07-08 | 1510103-012 | 6.70 ppb |
2015-07-08 | 1510103-010 | 6.70 ppb |
2015-07-08 | 1510103-007 | 6.80 ppb |
2015-08-05 | 1511980-012 | 5.90 ppb |
2015-08-05 | 1511980-011 | 3.40 ppb |
2015-08-05 | 1511980-007 | 7.20 ppb |
2015-08-05 | 1511980-010 | 6.00 ppb |
2015-09-09 | 1514301-010 | 7.70 ppb |
2015-09-09 | 1514301-012 | 6.30 ppb |
2015-09-09 | 1514301-011 | 6.00 ppb |
2015-09-09 | 1514301-007 | 7.40 ppb |
2015-10-07 | 1516030-012 | 3.70 ppb |
2015-10-07 | 1516030-011 | 3.30 ppb |
2015-10-07 | 1516030-006 | 3.80 ppb |
2015-10-07 | 1516030-009 | 4.60 ppb |
2015-11-04 | 1517576-010 | 5.20 ppb |
2015-11-04 | 1517576-011 | 3.20 ppb |
2015-11-04 | 1517576-007 | 4.80 ppb |
2015-11-04 | 1517576-012 | 3.60 ppb |
2015-12-02 | 1519086-011 | 2.90 ppb |
2015-12-02 | 1519086-012 | 3.40 ppb |
2015-12-02 | 1519086-007 | 4.30 ppb |
2015-12-02 | 1519086-010 | 4.60 ppb |
2016-01-06 | 1600312-011 | 2.40 ppb |
2016-01-06 | 1600312-012 | 2.80 ppb |
2016-01-06 | 1600312-010 | 3.70 ppb |
2016-01-06 | 1600312-007 | 3.70 ppb |
2016-02-03 | 1601638-010 | 3.00 ppb |
2016-02-03 | 1601638-011 | 2.50 ppb |
2016-02-03 | 1601638-007 | 4.00 ppb |
2016-02-03 | 1601638-012 | 2.70 ppb |
2016-03-02 | 1602966-010 | 2.30 ppb |
2016-03-02 | 1602966-012 | 2.30 ppb |
2016-03-02 | 1602966-011 | 2.10 ppb |
2016-03-02 | 1602966-007 | 3.40 ppb |
2016-04-06 | 1604789-011 | 3.70 ppb |
2016-04-06 | 1604789-010 | 4.80 ppb |
2016-04-06 | 1604789-012 | 3.50 ppb |
2016-04-06 | 1604789-007 | 4.40 ppb |
2016-05-04 | 1606613-012 | 4.60 ppb |
2016-05-04 | 1606613-007 | 7.60 ppb |
2016-05-04 | 1606613-011 | 5.00 ppb |
2016-05-04 | 1606613-010 | 6.50 ppb |
2016-06-08 | 1608681-006 | 6.20 ppb |
2016-06-08 | 1608681-013 | 5.30 ppb |
2016-06-08 | 1608681-014 | 5.00 ppb |
2016-06-08 | 1608681-012 | 5.90 ppb |
2016-06-08 | 1608681-009 | 5.90 ppb |
2016-07-06 | 1610588-007 | 10.00 ppb |
2016-07-06 | 1610588-010 | 11.0 ppb |
2016-07-06 | 1610588-012 | 9.00 ppb |
2016-07-06 | 1610588-011 | 9.20 ppb |
2016-08-03 | 1612539-007 | 11.0 ppb |
2016-08-03 | 1612539-012 | 9.30 ppb |
2016-08-03 | 1612539-009 | 7.80 ppb |
2016-08-03 | 1612539-010 | 7.70 ppb |
2016-09-07 | 1614875-011 | 3.40 ppb |
2016-09-07 | 1614875-007 | 5.40 ppb |
2016-09-07 | 1614875-012 | 3.60 ppb |
2016-09-07 | 1614875-010 | 4.80 ppb |
2016-10-05 | 1616823-012 | 3.40 ppb |
2016-10-05 | 1616823-002 | 4.20 ppb |
2016-10-05 | 1616823-009 | 6.20 ppb |
2016-10-05 | 1616823-011 | 3.40 ppb |
2016-11-02 | 1618348-010 | 3.40 ppb |
2016-11-02 | 1618348-007 | 5.20 ppb |
2016-11-02 | 1618348-012 | 3.20 ppb |
2016-11-02 | 1618348-011 | 2.80 ppb |
2016-12-07 | 1620270-009 | 5.50 ppb |
2016-12-07 | 1620270-002 | 3.40 ppb |
2016-12-07 | 1620270-012 | 2.60 ppb |
2016-12-07 | 1620270-011 | 2.50 ppb |
2017-01-04 | 1700403-003 | 2.40 ppb |
2017-01-04 | 1700403-011 | 4.20 ppb |
2017-01-04 | 1700403-004 | 2.60 ppb |
2017-01-04 | 1700403-002 | 3.20 ppb |
2017-02-01 | 1701549-003 | 4.80 ppb |
2017-02-01 | 1701549-004 | 3.60 ppb |
2017-02-01 | 1701549-001 | 2.50 ppb |
2017-02-01 | 1701549-002 | 2.80 ppb |
2017-03-01 | 1702919-001 | 2.20 ppb |
2017-03-01 | 1702919-004 | 2.60 ppb |
2017-03-01 | 1702919-002 | 2.40 ppb |
2017-03-01 | 1702919-003 | 4.40 ppb |
2017-04-05 | 1704744-004 | 2.70 ppb |
2017-04-05 | 1704744-003 | 2.70 ppb |
2017-04-05 | 1704744-001 | 3.40 ppb |
2017-04-05 | 1704744-002 | 4.00 ppb |
2017-05-03 | 1706368-004 | 6.20 ppb |
2017-05-03 | 1706368-002 | 5.30 ppb |
2017-05-03 | 1706368-003 | 5.40 ppb |
2017-05-03 | 1706368-001 | 6.80 ppb |
2017-05-31 | 1800236-005 | ND |
2017-05-31 | 1801970-005 | ND |
2017-06-07 | 1708525-001 | 5.70 ppb |
2017-06-07 | 1708525-002 | 6.30 ppb |
2017-06-07 | 1708525-003 | 4.00 ppb |
2017-06-07 | 1708525-004 | 4.00 ppb |
2017-07-05 | 1710148-001 | 7.10 ppb |
2017-07-05 | 1710148-002 | 6.60 ppb |
2017-07-05 | 1710148-004 | 6.50 ppb |
2017-07-05 | 1710148-003 | 7.80 ppb |
2017-08-02 | 1712271-004 | 9.20 ppb |
2017-08-02 | 1712271-002 | 9.00 ppb |
2017-08-02 | 1712271-003 | 10.00 ppb |
2017-08-02 | 1712271-001 | 10.00 ppb |
2017-09-06 | 1717647-004 | 6.00 ppb |
2017-09-06 | 1714647-001 | 7.00 ppb |
2017-09-06 | 1714647-002 | 6.10 ppb |
2017-09-06 | 1714647-003 | 7.60 ppb |
2017-10-04 | 1716498-001 | 6.50 ppb |
2017-10-04 | 1716498-003 | 6.40 ppb |
2017-10-04 | 1716498-002 | 4.80 ppb |
2017-10-04 | 1716498-004 | 4.30 ppb |
2017-11-01 | 1718017-004 | 4.60 ppb |
2017-11-01 | 1718017-001 | 6.50 ppb |
2017-11-01 | 1718017-003 | 4.50 ppb |
2017-11-01 | 1718017-0025 | 6.40 ppb |
2017-12-06 | 1719921-001 | 2.60 ppb |
2017-12-06 | 1719921-004 | 3.00 ppb |
2017-12-06 | 1719921-003 | 4.80 ppb |
2017-12-06 | 1719921-002 | 3.00 ppb |
2018-01-03 | 1800236-004 | 1.70 ppb |
2018-01-03 | 1800236-003 | 1.90 ppb |
2018-01-03 | 1800236-002 | 1.60 ppb |
2018-01-03 | 1800236-001 | 2.80 ppb |
2018-02-07 | 1801970-001 | 2.90 ppb |
2018-02-07 | 1801970-002 | 1.60 ppb |
2018-02-07 | 1801970-004 | 1.60 ppb |
2018-02-07 | 1801970-003 | 1.60 ppb |
2018-03-07 | 1803438-004 | 2.00 ppb |
2018-03-07 | 1803438-001 | 3.00 ppb |
2018-03-07 | 1803438-003 | 1.70 ppb |
2018-03-07 | 1803438-002 | 2.20 ppb |
2018-04-04 | 1804899-002 | 2.30 ppb |
2018-04-04 | 1804899-004 | 2.50 ppb |
2018-04-04 | 1804899-003 | 2.00 ppb |
2018-04-04 | 1804899-001 | 3.50 ppb |
2018-05-02 | 1806564-004 | 4.20 ppb |
2018-05-02 | 1806564-003 | 3.50 ppb |
2018-05-02 | 1806564-001 | 6.30 ppb |
2018-05-02 | 1806564-002 | 3.90 ppb |
2018-06-06 | 1808768-004 | 5.60 ppb |
2018-06-06 | 1808768-002 | 5.30 ppb |
2018-06-06 | 1808768-003 | 5.50 ppb |
2018-06-06 | 1808768-001 | 7.30 ppb |
2018-07-11 | 1811277-004 | 6.70 ppb |
2018-07-11 | 1811277-002 | 6.50 ppb |
2018-07-11 | 1811277-003 | 6.60 ppb |
2018-07-11 | 1811277-001 | 7.70 ppb |
2018-08-01 | 1812785-003 | 5.10 ppb |
2018-08-01 | 1812785-002 | 5.30 ppb |
2018-08-01 | 1812785-001 | 7.40 ppb |
2018-08-01 | 1812785-004 | 5.60 ppb |
2018-09-05 | 1815311-003 | 4.90 ppb |
2018-09-05 | 1815311-002 | 4.90 ppb |
2018-09-05 | 1815311-001 | 6.30 ppb |
2018-09-05 | 1815311-004 | 5.40 ppb |
2018-10-03 | 1817320-004 | 4.90 ppb |
2018-10-03 | 1817320-002 | 4.80 ppb |
2018-10-03 | 1817320-003 | 4.70 ppb |
2018-10-03 | 1817320-001 | 8.40 ppb |
2018-11-07 | 1819262-003 | 1.90 ppb |
2018-11-07 | 1819262-004 | 2.20 ppb |
2018-11-07 | 1819262-001 | 3.00 ppb |
2018-11-07 | 1819262-002 | 2.00 ppb |
2018-12-05 | 1820706-001 | 3.60 ppb |
2018-12-05 | 1820706-003 | 2.20 ppb |
2018-12-05 | 1820706-002 | 2.40 ppb |
2018-12-05 | 1820706-004 | 2.50 ppb |
2019-01-09 | 1900591-003 | 1.90 ppb |
2019-01-09 | 1900591-001 | 4.10 ppb |
2019-01-09 | 1900591-002 | 2.10 ppb |
2019-01-09 | 1900591-004 | 2.40 ppb |
2019-02-06 | 1901746-003 | 1.70 ppb |
2019-02-06 | 1901746-004 | 2.20 ppb |
2019-02-06 | 1901746-002 | 1.90 ppb |
2019-02-06 | 1901746-001 | 2.90 ppb |
2019-03-06 | 1903127-001 | 4.30 ppb |
2019-03-06 | 1903127-003 | 2.20 ppb |
2019-03-06 | 1903127-004 | 2.60 ppb |
2019-03-06 | 1903127-002 | 2.50 ppb |
2019-04-03 | 1904663-001 | 4.00 ppb |
2019-04-03 | 1904663-004 | 3.30 ppb |
2019-04-03 | 1904663-003 | 2.50 ppb |
2019-04-03 | 1904663-002 | 2.80 ppb |
2019-05-01 | 1906163-001 | 3.60 ppb |
2019-05-01 | 1906163-004 | 3.70 ppb |
2019-05-01 | 1906163-003 | 4.70 ppb |
2019-05-01 | 1906163-002 | 4.00 ppb |
2019-06-05 | 1908563-002 | 5.30 ppb |
2019-06-05 | 1908563-003 | 5.00 ppb |
2019-06-05 | 1908563-001 | 6.50 ppb |
2019-06-05 | 1908563-004 | 5.50 ppb |
2019-07-10 | 1911002-004 | 8.80 ppb |
2019-07-10 | 1911002-003 | 8.10 ppb |
2019-07-10 | 1911002-001 | 10.00 ppb |
2019-07-10 | 1911002-002 | 8.00 ppb |
2019-08-07 | 1912989-001 | 6.20 ppb |
2019-08-07 | 1912989-004 | 6.00 ppb |
2019-08-07 | 1912989-002 | 6.30 ppb |
2019-08-07 | 1912989-003 | 8.00 ppb |
2019-09-04 | 1914985-003 | 5.00 ppb |
2019-09-04 | 1914985-001 | 6.10 ppb |
2019-09-04 | 1914985-002 | 4.70 ppb |
2019-09-04 | 1914985-004 | 5.10 ppb |
2019-10-02 | 1916930-004 | 3.90 ppb |
2019-10-02 | 1916930-001 | 4.50 ppb |
2019-10-02 | 1916930-003 | 5.20 ppb |
2019-10-02 | 1916930-002 | 4.10 ppb |
2019-11-06 | 1918840-003 | 5.80 ppb |
2019-11-06 | 1918840-004 | 3.30 ppb |
2019-11-06 | 1918840-002 | 4.00 ppb |
2019-11-06 | 1918840-001 | 3.70 ppb |
2019-12-04 | 1920288-002 | 2.80 ppb |
2019-12-04 | 1920288-004 | 2.30 ppb |
2019-12-04 | 1920288-001 | 2.00 ppb |
2019-12-04 | 1920288-003 | 4.40 ppb |