Dichloroacetic acid

Cal American Water Company

Dichloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids 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

184

Samples

Samples exceeding legal limit (MCL)

158

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	2.39 ppb	24	23	ND - 6.40 ppb
2015	1.93 ppb	32	28	ND - 3.70 ppb
2016	0.997 ppb	32	17	ND - 2.90 ppb
2017	3.08 ppb	32	32	1.20 ppb - 4.80 ppb
2018	2.34 ppb	32	31	ND - 3.70 ppb
2019	1.88 ppb	32	27	ND - 3.90 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.2 ppb

The EWG Health Guideline of 0.2 ppb for dichloroacetic acid was proposed in 2020 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.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
2014-05-07	1225-006-1330	2.10 ppb
2014-05-07	1225-007-1415	2.80 ppb
2014-05-07	1225-008-0945	2.60 ppb
2014-05-07	1225-009-1510	2.80 ppb
2014-05-07	1225-010-1030	2.40 ppb
2014-05-07	1225-011-1105	2.60 ppb
2014-05-07	1225-012-1225	6.40 ppb
2014-05-07	1225-013-1150	2.40 ppb
2014-08-12	1225-006-1135	3.60 ppb
2014-08-12	1225-007-1410	1.90 ppb
2014-08-12	1225-008-1350	1.60 ppb
2014-08-12	1225-009-1425	2.30 ppb
2014-08-12	1225-010-1315	1.60 ppb
2014-08-12	1225-011-1210	2.70 ppb
2014-08-12	1225-012-1000	3.00 ppb
2014-08-12	1225-013-1055	2.60 ppb
2014-11-11	1225-006-1500	1.90 ppb
2014-11-11	1225-007-1400	2.60 ppb
2014-11-11	1225-008-1320	2.20 ppb
2014-11-11	1225-009-1430	1.40 ppb
2014-11-11	1225-010-1250	1.70 ppb
2014-11-11	1225-011-1230	2.10 ppb
2014-11-11	1225-012-1545	ND
2014-11-11	1225-013-1520	2.00 ppb
2015-02-10	1225-006-1450	1.70 ppb
2015-02-10	1225-007-0933	1.50 ppb
2015-02-10	1225-008-1015	ND
2015-02-10	1225-009-1515	1.50 ppb
2015-02-10	1225-010-1047	ND
2015-02-10	1225-011-1120	ND
2015-02-10	1225-012-1425	ND
2015-02-10	1225-013-1350	1.40 ppb
2015-05-12	1225-006-1355	2.60 ppb
2015-05-12	1225-007-1150	2.30 ppb
2015-05-12	1225-008-1120	2.00 ppb
2015-05-12	1225-009-1420	2.30 ppb
2015-05-12	1225-010-1042	2.20 ppb
2015-05-12	1225-011-1000	2.20 ppb
2015-05-12	1225-012-1332	2.30 ppb
2015-05-12	1225-013-1300	2.30 ppb
2015-08-10	1225-006-1350	2.70 ppb
2015-08-10	1225-007-1325	2.90 ppb
2015-08-10	1225-008-1050	1.70 ppb
2015-08-10	1225-009-1410	2.50 ppb
2015-08-10	1225-010-1120	1.50 ppb
2015-08-10	1225-011-1200	2.00 ppb
2015-08-10	1225-012-0945	3.10 ppb
2015-08-10	1225-013-1015	2.30 ppb
2015-11-10	1225-006-1100	3.20 ppb
2015-11-10	1225-007-1200	1.50 ppb
2015-11-10	1225-008-1140	1.60 ppb
2015-11-10	1225-009-0930	3.00 ppb
2015-11-10	1225-010-1055	1.30 ppb
2015-11-10	1225-011-0950	1.60 ppb
2015-11-10	1225-012-1300	3.70 ppb
2015-11-10	1225-013-1200	2.70 ppb
2016-02-09	1225-006-1000	1.000 ppb
2016-02-09	1225-007-1150	2.90 ppb
2016-02-09	1225-008-0950	ND
2016-02-09	1225-009-1210	ND
2016-02-09	1225-010-1035	ND
2016-02-09	1225-011-1120	ND
2016-02-09	1225-012-1040	ND
2016-02-09	1225-013-1305	1.80 ppb
2016-05-10	1225-006-0930	ND
2016-05-10	1225-007-1030	ND
2016-05-10	1225-008-0950	ND
2016-05-10	1225-009-1155	ND
2016-05-10	1225-010-1030	ND
2016-05-10	1225-011-1055	ND
2016-05-10	1225-012-1130	ND
2016-05-10	1225-013-1100	ND
2016-08-09	1225-006-1130	1.20 ppb
2016-08-09	1225-007-1100	1.20 ppb
2016-08-09	1225-008-1045	1.20 ppb
2016-08-09	1225-009-1000	1.20 ppb
2016-08-09	1225-010-1120	1.10 ppb
2016-08-09	1225-011-0950	1.10 ppb
2016-08-09	1225-012-1300	ND
2016-08-09	1225-013-1208	ND
2016-11-09	1225-006-1200	2.50 ppb
2016-11-09	1225-007-1445	2.70 ppb
2016-11-09	1225-008-1355	2.40 ppb
2016-11-09	1225-009-1315	2.40 ppb
2016-11-09	1225-010-1340	2.30 ppb
2016-11-09	1225-012-1045	2.20 ppb
2016-11-09	1225-013-1130	2.20 ppb
2016-11-11	1225-011-1010	2.50 ppb
2017-02-08	1225-006-1000	1.90 ppb
2017-02-08	1225-007-1300	1.20 ppb
2017-02-08	1225-008-1040	2.50 ppb
2017-02-08	1225-009-1050	2.10 ppb
2017-02-08	1225-010-1100	2.20 ppb
2017-02-08	1225-011-1200	2.60 ppb
2017-02-08	1225-012-1100	2.20 ppb
2017-02-08	1225-013-1315	2.60 ppb
2017-05-09	1225-006-1110	3.80 ppb
2017-05-09	1225-007-1330	2.10 ppb
2017-05-09	1225-008-1300	3.10 ppb
2017-05-09	1225-009-1200	3.80 ppb
2017-05-09	1225-010-1150	3.20 ppb
2017-05-09	1225-011-1115	3.00 ppb
2017-05-09	1225-012-1030	3.20 ppb
2017-05-09	1225-013-1030	1.70 ppb
2017-08-08	1225-006-1100	2.60 ppb
2017-08-08	1225-007-1130	2.90 ppb
2017-08-08	1225-008-1300	2.50 ppb
2017-08-08	1225-009-1030	3.10 ppb
2017-08-08	1225-010-1145	2.60 ppb
2017-08-08	1225-011-1100	2.40 ppb
2017-08-08	1225-012-1200	2.20 ppb
2017-08-08	1225-013-1000	2.40 ppb
2017-11-09	1225-006-1245	4.80 ppb
2017-11-09	1225-007-1435	4.50 ppb
2017-11-09	1225-008-1409	4.30 ppb
2017-11-09	1225-009-1300	4.60 ppb
2017-11-09	1225-010-1352	4.80 ppb
2017-11-09	1225-011-1337	4.10 ppb
2017-11-09	1225-012-1317	4.60 ppb
2017-11-09	1225-013-1315	4.80 ppb
2018-02-06	1225-006-1000	3.40 ppb
2018-02-06	1225-007-1100	3.70 ppb
2018-02-06	1225-008-1130	2.90 ppb
2018-02-06	1225-009-1030	3.30 ppb
2018-02-06	1225-010-1100	3.10 ppb
2018-02-06	1225-011-1200	3.10 ppb
2018-02-06	1225-012-1200	3.50 ppb
2018-02-06	1225-013-1015	2.70 ppb
2018-05-08	1225-006-0900	3.20 ppb
2018-05-08	1225-007-1100	1.30 ppb
2018-05-08	1225-008-1100	2.80 ppb
2018-05-08	1225-009-0930	2.80 ppb
2018-05-08	1225-010-1040	2.80 ppb
2018-05-08	1225-011-1012	2.60 ppb
2018-05-08	1225-012-1130	2.30 ppb
2018-05-08	1225-013-0950	2.40 ppb
2018-08-08	1225-006-1030	2.20 ppb
2018-08-08	1225-007-1130	2.80 ppb
2018-08-08	1225-008-1110	1.70 ppb
2018-08-08	1225-009-1100	2.40 ppb
2018-08-08	1225-010-1135	2.20 ppb
2018-08-08	1225-011-1155	ND
2018-08-08	1225-012-1300	2.30 ppb
2018-08-08	1225-013-1040	2.10 ppb
2018-11-14	1225-006-1355	1.60 ppb
2018-11-14	1225-007-1455	1.50 ppb
2018-11-14	1225-008-1520	1.70 ppb
2018-11-14	1225-009-1425	1.40 ppb
2018-11-14	1225-010-1540	1.70 ppb
2018-11-14	1225-011-1555	1.70 ppb
2018-11-14	1225-012-1250	2.00 ppb
2018-11-14	1225-013-1320	1.60 ppb
2019-02-12	1225-006-1400	1.90 ppb
2019-02-12	1225-007-1500	3.90 ppb
2019-02-12	1225-008-1420	1.80 ppb
2019-02-12	1225-009-1430	1.70 ppb
2019-02-12	1225-010-1500	2.30 ppb
2019-02-12	1225-011-1440	1.70 ppb
2019-02-12	1225-012-1600	1.70 ppb
2019-02-12	1225-013-1600	1.80 ppb
2019-05-14	1225-006-1230	2.20 ppb
2019-05-14	1225-007-1330	ND
2019-05-14	1225-008-1600	2.30 ppb
2019-05-14	1225-009-1300	2.40 ppb
2019-05-14	1225-010-1630	2.10 ppb
2019-05-14	1225-011-1530	2.40 ppb
2019-05-14	1225-012-1430	2.60 ppb
2019-05-14	1225-013-1400	ND
2019-08-14	1225-006-1200	2.10 ppb
2019-08-14	1225-007-1300	2.50 ppb
2019-08-14	1225-008-1350	2.50 ppb
2019-08-14	1225-009-1230	2.50 ppb
2019-08-14	1225-010-1330	2.80 ppb
2019-08-14	1225-011-1300	2.80 ppb
2019-08-14	1225-012-1400	2.10 ppb
2019-08-14	1225-013-1230	2.70 ppb
2019-11-13	1225-006-1615	2.30 ppb
2019-11-13	1225-007-1749	ND
2019-11-13	1225-009-1645	2.30 ppb
2019-11-13	1225-010-1707	ND
2019-11-13	1225-011-1725	ND
2019-11-13	1225-012-1409	1.60 ppb
2019-11-13	1225-013-1510	1.20 ppb
2019-11-21	1225-008-1108	2.10 ppb