Bromodichloromethane

Rochester Water Department

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.

MORE ABOUT THIS CONTAMINANT

187

Samples

Samples exceeding legal limit (MCL)

175

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2013	N/A	0	0	N/A
2014	1.45 ppb	2	1	ND - 2.90 ppb
2015	ND	1	0	ND
2016	6.72 ppb	30	28	ND - 13.0 ppb
2017	4.31 ppb	54	50	ND - 11.0 ppb
2018	4.59 ppb	50	48	ND - 9.50 ppb
2019	5.56 ppb	50	48	ND - 14.0 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
2014-08-20	1408-00732-002	2.90 ppb
2014-08-20	1408-00733-002	ND
2015-08-26	1508-02175-001	ND
2016-02-18	1602-01314-001	6.10 ppb
2016-02-18	1602-01314-002	4.80 ppb
2016-02-18	1602-01314-003	4.20 ppb
2016-02-18	1602-01314-004	6.80 ppb
2016-05-25	1605-02909-001	8.40 ppb
2016-05-25	1605-02909-002	1.20 ppb
2016-05-25	1605-02909-003	6.90 ppb
2016-05-25	1605-02909-004	4.70 ppb
2016-08-24	1608-02769-001	13.0 ppb
2016-08-24	1608-02769-002	13.0 ppb
2016-08-24	1608-02769-003	9.60 ppb
2016-08-24	1608-02769-004	13.0 ppb
2016-08-29	1608-03159-001	13.0 ppb
2016-09-13	1609-01458-001	7.60 ppb
2016-09-21	1609-02232-001	7.80 ppb
2016-09-27	1609-02716-001	8.20 ppb
2016-09-27	1609-02716-002	8.30 ppb
2016-09-27	1609-02716-003	6.40 ppb
2016-10-31	1611-00331-001	7.00 ppb
2016-10-31	1611-00331-002	ND
2016-10-31	1611-00331-003	6.60 ppb
2016-10-31	1611-00331-004	6.10 ppb
2016-11-09	1611-00972-001	6.50 ppb
2016-11-09	1611-00972-002	ND
2016-11-09	1611-00972-003	6.20 ppb
2016-11-09	1611-00972-004	11.0 ppb
2016-12-14	1612-01163-001	4.30 ppb
2016-12-14	1612-01163-002	0.700 ppb
2016-12-14	1612-01163-003	4.30 ppb
2016-12-14	1612-01163-004	5.80 ppb
2017-01-11	1701-00990-001	3.20 ppb
2017-01-11	1701-00990-002	4.20 ppb
2017-01-11	1701-00990-003	3.50 ppb
2017-01-11	1701-00990-004	5.80 ppb
2017-02-08	1702-00813-001	3.10 ppb
2017-02-08	1702-00813-002	3.40 ppb
2017-02-08	1702-00813-003	2.80 ppb
2017-02-08	1702-00813-004	4.80 ppb
2017-03-07	1703-00647-001	3.20 ppb
2017-03-07	1703-00647-002	3.70 ppb
2017-03-07	1703-00647-003	3.00 ppb
2017-03-07	1703-00647-004	4.50 ppb
2017-04-14	1704-01956-001	2.70 ppb
2017-04-14	1704-01956-002	ND
2017-04-14	1704-01956-003	2.50 ppb
2017-04-14	1704-01956-004	2.60 ppb
2017-05-12	1705-02887-001	4.30 ppb
2017-05-12	1705-02887-002	ND
2017-05-12	1705-02887-003	5.10 ppb
2017-05-12	1705-02887-004	4.70 ppb
2017-06-16	1706-02956-001	3.40 ppb
2017-06-16	1706-02956-002	ND
2017-06-16	1706-02956-003	3.60 ppb
2017-06-16	1706-02956-004	1.80 ppb
2017-07-10	1707-02305-001	6.45 ppb
2017-07-10	1707-02305-002	1.07 ppb
2017-07-10	1707-02305-003	5.89 ppb
2017-07-14	1707-02305-004	3.23 ppb
2017-08-03	1708-00610-001	7.35 ppb
2017-08-03	1708-00610-002	8.99 ppb
2017-08-03	1708-00610-003	6.22 ppb
2017-08-03	1708-00610-004	9.32 ppb
2017-08-11	1708-03032-001	9.00 ppb
2017-08-11	1708-03032-002	0.800 ppb
2017-08-11	1708-03032-003	7.40 ppb
2017-08-11	1708-03032-004	11.0 ppb
2017-09-07	1709-00740-001	3.16 ppb
2017-09-07	1709-00744-001	ND
2017-09-28	1709-03242-001	5.87 ppb
2017-09-28	1709-03242-002	0.530 ppb
2017-09-28	1709-03242-003	6.51 ppb
2017-09-28	1709-03242-004	6.31 ppb
2017-10-11	1710-02044-001	8.20 ppb
2017-10-11	1710-02044-002	0.700 ppb
2017-10-11	1710-02044-003	7.00 ppb
2017-10-11	1710-02044-004	8.80 ppb
2017-11-09	1711-01533-001	5.50 ppb
2017-11-09	1711-01533-002	0.800 ppb
2017-11-09	1711-01533-003	4.90 ppb
2017-11-09	1711-01533-004	3.00 ppb
2017-12-14	1712-01903-001	6.00 ppb
2017-12-14	1712-01903-002	1.000 ppb
2017-12-14	1712-01903-003	4.60 ppb
2017-12-14	1712-01903-004	7.00 ppb
2018-01-12	1801-01517-001	5.00 ppb
2018-01-12	1801-01517-002	0.900 ppb
2018-01-12	1801-01517-003	4.40 ppb
2018-01-12	1801-01517-004	2.40 ppb
2018-02-16	1802-01670-001	5.40 ppb
2018-02-16	1802-01670-002	0.900 ppb
2018-02-16	1802-01670-003	4.10 ppb
2018-02-16	1802-01670-004	4.70 ppb
2018-03-16	1803-01835-001	4.30 ppb
2018-03-16	1803-01835-002	0.800 ppb
2018-03-16	1803-01835-003	3.70 ppb
2018-03-16	1803-01835-004	5.70 ppb
2018-04-13	1804-01973-001	4.20 ppb
2018-04-13	1804-01973-002	0.800 ppb
2018-04-13	1804-01973-003	3.80 ppb
2018-04-13	1804-01973-004	4.50 ppb
2018-05-11	1805-02265-001	4.80 ppb
2018-05-11	1805-02265-002	0.800 ppb
2018-05-11	1805-02265-003	4.40 ppb
2018-05-11	1805-02265-004	6.30 ppb
2018-06-15	1806-02666-001	6.70 ppb
2018-06-15	1806-02666-002	ND
2018-06-15	1806-02666-003	6.10 ppb
2018-06-15	1806-02666-004	1.30 ppb
2018-07-09	1807-01566-001	8.40 ppb
2018-07-09	1807-01566-002	9.40 ppb
2018-07-09	1807-01566-003	7.10 ppb
2018-07-09	1807-01566-004	8.90 ppb
2018-08-08	1808-01205-001	9.10 ppb
2018-08-08	1808-01205-002	0.500 ppb
2018-08-08	1808-01205-003	7.80 ppb
2018-08-08	1808-01205-004	3.80 ppb
2018-08-28	1808-04261-001	4.20 ppb
2018-08-29	1808-04255-001	ND
2018-09-14	1809-02457-001	9.20 ppb
2018-09-14	1809-02457-002	0.600 ppb
2018-09-14	1809-02457-003	7.40 ppb
2018-09-14	1809-02457-004	5.00 ppb
2018-10-12	1810-01713-001	9.50 ppb
2018-10-12	1810-01713-002	1.30 ppb
2018-10-12	1810-01713-003	6.70 ppb
2018-10-12	1810-01713-004	9.00 ppb
2018-11-15	1811-01906-001	5.00 ppb
2018-11-15	1811-01906-002	1.40 ppb
2018-11-15	1811-01906-003	5.00 ppb
2018-11-15	1811-01906-004	9.20 ppb
2018-12-14	1812-01819-001	3.40 ppb
2018-12-14	1812-01819-002	0.900 ppb
2018-12-14	1812-01819-003	4.50 ppb
2018-12-14	1812-01819-004	6.30 ppb
2019-01-10	1901-01452-001	3.10 ppb
2019-01-10	1901-01452-002	0.900 ppb
2019-01-10	1901-01452-003	4.20 ppb
2019-01-10	1901-01452-004	4.80 ppb
2019-02-15	1902-01496-001	4.60 ppb
2019-02-15	1902-01496-002	0.800 ppb
2019-02-15	1902-01496-003	3.70 ppb
2019-02-15	1902-01496-004	5.00 ppb
2019-03-12	1903-01076-001	4.40 ppb
2019-03-12	1903-01076-002	1.10 ppb
2019-03-12	1903-01076-003	3.70 ppb
2019-03-12	1903-01076-004	4.90 ppb
2019-04-12	1904-02016-001	4.70 ppb
2019-04-12	1904-02016-002	1.10 ppb
2019-04-12	1904-02016-003	3.90 ppb
2019-04-12	1904-02016-004	5.00 ppb
2019-05-10	1905-02374-001	4.70 ppb
2019-05-10	1905-02374-002	1.10 ppb
2019-05-10	1905-02374-003	4.40 ppb
2019-05-10	1905-02374-004	5.60 ppb
2019-06-13	1906-02600-001	5.70 ppb
2019-06-13	1906-02600-002	1.000 ppb
2019-06-13	1906-02600-003	5.00 ppb
2019-06-13	1906-02600-004	6.40 ppb
2019-07-10	1907-01290-001	6.00 ppb
2019-07-10	1907-01290-002	1.000 ppb
2019-07-10	1907-01290-003	6.10 ppb
2019-07-10	1907-01290-004	7.40 ppb
2019-08-13	1908-02213-001	10.00 ppb
2019-08-13	1908-02213-002	0.800 ppb
2019-08-13	1908-02213-003	9.80 ppb
2019-08-13	1908-02213-004	11.0 ppb
2019-08-28	1908-03980-001	ND
2019-08-28	1908-03984-001	ND
2019-09-13	1909-02349-001	9.20 ppb
2019-09-13	1909-02349-002	14.0 ppb
2019-09-13	1909-02349-003	10.00 ppb
2019-09-13	1909-02349-004	11.0 ppb
2019-10-11	1910-02186-001	6.30 ppb
2019-10-11	1910-02186-002	11.0 ppb
2019-10-11	1910-02186-003	6.60 ppb
2019-10-11	1910-02186-004	9.20 ppb
2019-11-15	1911-02090-001	8.60 ppb
2019-11-15	1911-02090-002	1.20 ppb
2019-11-15	1911-02090-003	7.40 ppb
2019-11-15	1911-02090-004	9.10 ppb
2019-12-13	1912-01747-001	9.00 ppb
2019-12-13	1912-01747-002	9.10 ppb
2019-12-13	1912-01747-003	5.70 ppb
2019-12-13	1912-01747-004	8.50 ppb