Monochloroacetic acid

Lafayette Utilities Water System

Monochloroacetic 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

288

Samples

Samples exceeding legal limit (MCL)

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	4.50 ppb	48	24	ND - 18.0 ppb
2015	0.138 ppb	48	4	ND - 1.70 ppb
2016	0.553 ppb	48	14	ND - 4.80 ppb
2017	ND	48	0	ND
2018	ND	48	0	ND
2019	ND	48	0	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 53 ppb

The EWG Health Guideline of 53 ppb for monochloroacetic 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.. This health guideline protects against system toxicity.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-01-10	L0038767-02	14.0 ppb
2014-01-10	L0038767-03	18.0 ppb
2014-01-10	L0038767-04	11.0 ppb
2014-01-10	L0038767-05	15.0 ppb
2014-01-10	L0038767-06	12.0 ppb
2014-01-10	L0038767-02	14.0 ppb
2014-01-10	L0038767-03	18.0 ppb
2014-01-10	L0038767-04	11.0 ppb
2014-01-10	L0038767-05	15.0 ppb
2014-01-10	L0038767-06	12.0 ppb
2014-01-11	L0038767-01	11.0 ppb
2014-01-11	L0038767-01	11.0 ppb
2014-04-07	L0041834-01	6.50 ppb
2014-04-07	L0041834-02	2.60 ppb
2014-04-07	L0041834-03	3.10 ppb
2014-04-07	L0041834-04	4.00 ppb
2014-04-07	L0041834-05	5.20 ppb
2014-04-07	L0041834-06	5.60 ppb
2014-04-07	L0041834-01	6.50 ppb
2014-04-07	L0041834-02	2.60 ppb
2014-04-07	L0041834-03	3.10 ppb
2014-04-07	L0041834-04	4.00 ppb
2014-04-07	L0041834-05	5.20 ppb
2014-04-07	L0041834-06	5.60 ppb
2014-07-09	L0045851-01	ND
2014-07-09	L0045851-02	ND
2014-07-09	L0045851-03	ND
2014-07-09	L0045851-04	ND
2014-07-09	L0045851-05	ND
2014-07-09	L0045851-06	ND
2014-07-09	L0045851-01	ND
2014-07-09	L0045851-02	ND
2014-07-09	L0045851-03	ND
2014-07-09	L0045851-04	ND
2014-07-09	L0045851-05	ND
2014-07-09	L0045851-06	ND
2014-10-10	L0049360-01	ND
2014-10-10	L0049360-02	ND
2014-10-10	L0049360-03	ND
2014-10-10	L0049360-05	ND
2014-10-10	L0049360-06	ND
2014-10-10	L0049360-01	ND
2014-10-10	L0049360-02	ND
2014-10-10	L0049360-03	ND
2014-10-10	L0049360-05	ND
2014-10-10	L0049360-06	ND
2014-10-11	L0049360-04	ND
2014-10-11	L0049360-04	ND
2015-01-09	L0052948-01	ND
2015-01-09	L0052948-04	ND
2015-01-09	L0052948-06	ND
2015-01-09	L0052948-01	ND
2015-01-09	L0052948-04	ND
2015-01-09	L0052948-06	ND
2015-01-10	L0052948-02	ND
2015-01-10	L0052948-03	ND
2015-01-10	L0052948-05	ND
2015-01-10	L0052948-02	ND
2015-01-10	L0052948-03	ND
2015-01-10	L0052948-05	ND
2015-04-10	LA5900-3	ND
2015-04-10	LA5900-4	ND
2015-04-10	LA5900-5	ND
2015-04-10	LA5900-6	ND
2015-04-10	LA5900-3	ND
2015-04-10	LA5900-4	ND
2015-04-10	LA5900-5	ND
2015-04-10	LA5900-6	ND
2015-04-11	LA5900-1	ND
2015-04-11	LA5900-2	ND
2015-04-11	LA5900-1	ND
2015-04-11	LA5900-2	ND
2015-07-14	LA9484-1	ND
2015-07-14	LA9484-2	ND
2015-07-14	LA9484-3	ND
2015-07-14	LA9484-4	ND
2015-07-14	LA9484-5	ND
2015-07-14	LA9484-6	ND
2015-07-14	LA9484-1	ND
2015-07-14	LA9484-2	ND
2015-07-14	LA9484-3	ND
2015-07-14	LA9484-4	ND
2015-07-14	LA9484-5	ND
2015-07-14	LA9484-6	ND
2015-10-12	LA12747-1	ND
2015-10-12	LA12747-2	ND
2015-10-12	LA12747-3	ND
2015-10-12	LA12747-4	1.60 ppb
2015-10-12	LA12747-5	ND
2015-10-12	LA12747-6	1.70 ppb
2015-10-12	LA12747-1	ND
2015-10-12	LA12747-2	ND
2015-10-12	LA12747-3	ND
2015-10-12	LA12747-4	1.60 ppb
2015-10-12	LA12747-5	ND
2015-10-12	LA12747-6	1.70 ppb
2016-01-11	LA16317-1	ND
2016-01-11	LA16317-2	ND
2016-01-11	LA16317-3	1.10 ppb
2016-01-11	LA16317-4	1.30 ppb
2016-01-11	LA16317-5	ND
2016-01-11	LA16317-6	0.870 ppb
2016-01-11	LA16317-1	ND
2016-01-11	LA16317-2	ND
2016-01-11	LA16317-3	1.10 ppb
2016-01-11	LA16317-4	1.30 ppb
2016-01-11	LA16317-5	ND
2016-01-11	LA16317-6	0.870 ppb
2016-04-11	LA19308-1	ND
2016-04-11	LA19308-2	1.20 ppb
2016-04-11	LA19308-3	ND
2016-04-11	LA19308-4	ND
2016-04-11	LA19308-5	ND
2016-04-11	LA19308-6	ND
2016-04-11	LA19308-1	ND
2016-04-11	LA19308-2	1.20 ppb
2016-04-11	LA19308-3	ND
2016-04-11	LA19308-4	ND
2016-04-11	LA19308-5	ND
2016-04-11	LA19308-6	ND
2016-07-12	LA22986-1	ND
2016-07-12	LA22986-2	ND
2016-07-12	LA22986-3	0.910 ppb
2016-07-12	LA22986-4	ND
2016-07-12	LA22986-5	4.80 ppb
2016-07-12	LA22986-6	ND
2016-07-12	LA22986-1	ND
2016-07-12	LA22986-2	ND
2016-07-12	LA22986-3	0.910 ppb
2016-07-12	LA22986-4	ND
2016-07-12	LA22986-5	4.80 ppb
2016-07-12	LA22986-6	ND
2016-10-12	LA26681-1	ND
2016-10-12	LA26681-2	ND
2016-10-12	LA26681-3	ND
2016-10-12	LA26681-4	ND
2016-10-12	LA26681-5	3.10 ppb
2016-10-12	LA26681-6	ND
2016-10-12	LA26681-1	ND
2016-10-12	LA26681-2	ND
2016-10-12	LA26681-3	ND
2016-10-12	LA26681-4	ND
2016-10-12	LA26681-5	3.10 ppb
2016-10-12	LA26681-6	ND
2017-01-12	35289032001	ND
2017-01-12	35289032002	ND
2017-01-12	35289032003	ND
2017-01-12	35289032004	ND
2017-01-12	35289032001	ND
2017-01-12	35289032002	ND
2017-01-12	35289032003	ND
2017-01-12	35289032004	ND
2017-01-13	35289034001	ND
2017-01-13	35289034002	ND
2017-01-13	35289034001	ND
2017-01-13	35289034002	ND
2017-04-13	35306502001	ND
2017-04-13	35306502002	ND
2017-04-13	35306502003	ND
2017-04-13	35306502004	ND
2017-04-13	35306502005	ND
2017-04-13	35306502006	ND
2017-04-13	35306502001	ND
2017-04-13	35306502002	ND
2017-04-13	35306502003	ND
2017-04-13	35306502004	ND
2017-04-13	35306502005	ND
2017-04-13	35306502006	ND
2017-07-13	35324177015	ND
2017-07-13	35324177016	ND
2017-07-13	35324177017	ND
2017-07-13	35324177018	ND
2017-07-13	35324177019	ND
2017-07-13	35324177020	ND
2017-07-13	35324177015	ND
2017-07-13	35324177016	ND
2017-07-13	35324177017	ND
2017-07-13	35324177018	ND
2017-07-13	35324177019	ND
2017-07-13	35324177020	ND
2017-10-06	35340512001	ND
2017-10-06	35340512002	ND
2017-10-06	35340512003	ND
2017-10-06	35340512004	ND
2017-10-06	35340512005	ND
2017-10-06	35340512006	ND
2017-10-06	35340512001	ND
2017-10-06	35340512002	ND
2017-10-06	35340512003	ND
2017-10-06	35340512004	ND
2017-10-06	35340512005	ND
2017-10-06	35340512006	ND
2018-01-12	35368396001	ND
2018-01-12	35368396002	ND
2018-01-12	35368396003	ND
2018-01-12	35368396004	ND
2018-01-12	35368396005	ND
2018-01-12	35368396006	ND
2018-01-12	35368396001	ND
2018-01-12	35368396002	ND
2018-01-12	35368396003	ND
2018-01-12	35368396004	ND
2018-01-12	35368396005	ND
2018-01-12	35368396006	ND
2018-04-05	35384677001	ND
2018-04-05	35384677002	ND
2018-04-05	35384677003	ND
2018-04-05	35384677004	ND
2018-04-05	35384677005	ND
2018-04-05	35384677006	ND
2018-04-05	35384677001	ND
2018-04-05	35384677002	ND
2018-04-05	35384677003	ND
2018-04-05	35384677004	ND
2018-04-05	35384677005	ND
2018-04-05	35384677006	ND
2018-07-31	35407898001	ND
2018-07-31	35407898002	ND
2018-07-31	35407898003	ND
2018-07-31	35407898004	ND
2018-07-31	35407898005	ND
2018-07-31	35407898006	ND
2018-07-31	35407898001	ND
2018-07-31	35407898002	ND
2018-07-31	35407898003	ND
2018-07-31	35407898004	ND
2018-07-31	35407898005	ND
2018-07-31	35407898006	ND
2018-10-18	35425428001	ND
2018-10-18	35425428002	ND
2018-10-18	35425428003	ND
2018-10-18	35425428004	ND
2018-10-18	35425428005	ND
2018-10-18	35425428006	ND
2018-10-18	35425428001	ND
2018-10-18	35425428002	ND
2018-10-18	35425428003	ND
2018-10-18	35425428004	ND
2018-10-18	35425428005	ND
2018-10-18	35425428006	ND
2019-01-10	35441863001	ND
2019-01-10	35441863002	ND
2019-01-10	35441863003	ND
2019-01-10	35441863004	ND
2019-01-10	35441863005	ND
2019-01-10	35441863006	ND
2019-01-10	35441863001	ND
2019-01-10	35441863002	ND
2019-01-10	35441863003	ND
2019-01-10	35441863004	ND
2019-01-10	35441863005	ND
2019-01-10	35441863006	ND
2019-04-11	35461551001	ND
2019-04-11	35461551002	ND
2019-04-11	35461551003	ND
2019-04-11	35461551004	ND
2019-04-11	35461551005	ND
2019-04-11	35461551006	ND
2019-04-11	35461551001	ND
2019-04-11	35461551002	ND
2019-04-11	35461551003	ND
2019-04-11	35461551004	ND
2019-04-11	35461551005	ND
2019-04-11	35461551006	ND
2019-07-19	35483795001	ND
2019-07-19	35483795002	ND
2019-07-19	35483795003	ND
2019-07-19	35483795004	ND
2019-07-19	35483795005	ND
2019-07-19	35483795006	ND
2019-07-19	35483795001	ND
2019-07-19	35483795002	ND
2019-07-19	35483795003	ND
2019-07-19	35483795004	ND
2019-07-19	35483795005	ND
2019-07-19	35483795006	ND
2019-10-18	35506260001	ND
2019-10-18	35506260002	ND
2019-10-18	35506260003	ND
2019-10-18	35506260004	ND
2019-10-18	35506260005	ND
2019-10-18	35506260006	ND
2019-10-18	35506260001	ND
2019-10-18	35506260002	ND
2019-10-18	35506260003	ND
2019-10-18	35506260004	ND
2019-10-18	35506260005	ND
2019-10-18	35506260006	ND