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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

City of Modesto

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

 

197

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.156 ppb321ND - 5.00 ppb
20150.806 ppb328ND - 5.30 ppb
20160.672 ppb326ND - 4.20 ppb
20170.0811 ppb371ND - 3.00 ppb
20180.359 ppb324ND - 3.50 ppb
20190.178 ppb322ND - 2.90 ppb

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
2014-03-111610-901-0825ND
2014-03-111610-906-1100ND
2014-03-181610-902-1156ND
2014-03-181610-903-1320ND
2014-03-181610-905-1247ND
2014-03-181610-907-0840ND
2014-03-251610-900-1035ND
2014-03-251610-904-0820ND
2014-06-101610-901-1225ND
2014-06-101610-906-1235ND
2014-06-171610-902-1140ND
2014-06-171610-903-1325ND
2014-06-171610-905-1255ND
2014-06-241610-900-1030ND
2014-06-241610-904-1050ND
2014-07-021610-907-0740ND
2014-09-091610-901-0745ND
2014-09-091610-906-1010ND
2014-09-161610-902-08165.00 ppb
2014-09-161610-903-1000ND
2014-09-161610-905-0735ND
2014-09-161610-907-0920ND
2014-09-231610-900-1013ND
2014-09-231610-904-0815ND
2014-12-091610-901-1030ND
2014-12-091610-906-1105ND
2014-12-161610-902-1110ND
2014-12-161610-903-1150ND
2014-12-161610-905-1300ND
2014-12-161610-907-1021ND
2014-12-221610-904-1026ND
2014-12-231610-900-1250ND
2015-03-101610-901-1119ND
2015-03-101610-906-1015ND
2015-03-171610-902-09152.70 ppb
2015-03-171610-903-1130ND
2015-03-171610-905-0750ND
2015-03-171610-907-1100ND
2015-03-241610-904-0705ND
2015-03-251610-900-0930ND
2015-06-091610-901-09202.80 ppb
2015-06-091610-906-1200ND
2015-06-161610-902-09405.30 ppb
2015-06-161610-903-1020ND
2015-06-161610-905-1005ND
2015-06-161610-907-1123ND
2015-06-231610-900-0925ND
2015-06-231610-904-10102.40 ppb
2015-09-081610-901-08023.70 ppb
2015-09-081610-906-09502.80 ppb
2015-09-151610-902-1032ND
2015-09-151610-903-1410ND
2015-09-151610-905-11302.30 ppb
2015-09-151610-907-1050ND
2015-09-221610-900-0924ND
2015-09-221610-904-09103.80 ppb
2015-12-081610-901-0910ND
2015-12-081610-906-1005ND
2015-12-151610-003-1020ND
2015-12-151610-902-1055ND
2015-12-151610-905-1130ND
2015-12-151610-907-0935ND
2015-12-221610-900-0930ND
2015-12-221610-904-1105ND
2016-03-081610-901-1322ND
2016-03-081610-906-0845ND
2016-03-151610-902-1307ND
2016-03-151610-903-1100ND
2016-03-151610-905-0740ND
2016-03-151610-907-1010ND
2016-03-221610-900-1010ND
2016-03-221610-904-0848ND
2016-06-141610-901-1015ND
2016-06-141610-906-0925ND
2016-06-211610-902-07554.10 ppb
2016-06-211610-903-1255ND
2016-06-211610-905-07304.20 ppb
2016-06-211610-907-10404.00 ppb
2016-06-281610-900-0830ND
2016-06-281610-904-11293.70 ppb
2016-09-131610-901-1430ND
2016-09-131610-906-0930ND
2016-09-201610-902-12103.00 ppb
2016-09-201610-903-1050ND
2016-09-201610-905-1300ND
2016-09-201610-907-10152.50 ppb
2016-09-271610-904-0853ND
2016-09-291610-900-1008ND
2016-12-135867-901-0955ND
2016-12-205867-902-1313ND
2016-12-205867-903-1155ND
2016-12-205867-905-0730ND
2016-12-205867-907-1025ND
2016-12-271610-900-0855ND
2016-12-271610-904-0844ND
2016-12-281610-906-0810ND
2017-03-031644-245-1300ND
2017-03-141610-900-1147ND
2017-03-141610-901-1415ND
2017-03-141610-902-0950ND
2017-03-141610-903-1213ND
2017-03-141610-904-0931ND
2017-03-141610-905-0912ND
2017-03-141610-906-0750ND
2017-03-141610-907-1122ND
2017-03-215867-902-11553.00 ppb
2017-03-215867-903-0945ND
2017-03-215867-905-1230ND
2017-03-215867-907-0735ND
2017-06-131610-901-0940ND
2017-06-131610-906-0920ND
2017-06-205867-902-1058ND
2017-06-205867-903-1200ND
2017-06-205867-905-0730ND
2017-06-205867-907-0915ND
2017-06-271610-900-1020ND
2017-06-271610-904-1051ND
2017-09-121610-901-1035ND
2017-09-121610-906-0750ND
2017-09-191610-900-1003ND
2017-09-191610-902-1133ND
2017-09-191610-903-1146ND
2017-09-191610-904-1255ND
2017-09-191610-905-1206ND
2017-09-191610-907-1301ND
2017-12-125867-901-0937ND
2017-12-125867-906-0940ND
2017-12-195867-902-0822ND
2017-12-195867-903-0930ND
2017-12-195867-905-0755ND
2017-12-195867-907-1100ND
2017-12-271610-900-0855ND
2017-12-271610-904-0839ND
2018-03-131610-901-0720ND
2018-03-131610-906-1130ND
2018-03-201610-902-0943ND
2018-03-201610-903-0935ND
2018-03-201610-905-10153.50 ppb
2018-03-201610-907-07302.90 ppb
2018-03-271610-900-0830ND
2018-03-271610-904-1020ND
2018-06-121610-901-0940ND
2018-06-121610-906-0915ND
2018-06-191610-902-0745ND
2018-06-191610-903-0945ND
2018-06-191610-905-0720ND
2018-06-191610-907-1010ND
2018-06-261610-900-0855ND
2018-06-261610-904-0830ND
2018-09-111610-901-1410ND
2018-09-111610-906-0850ND
2018-09-181610-902-0825ND
2018-09-181610-903-1045ND
2018-09-181610-905-0730ND
2018-09-181610-907-0820ND
2018-09-251610-900-0945ND
2018-09-251610-904-0840ND
2018-12-111610-901-0920ND
2018-12-111610-906-0950ND
2018-12-181610-902-08132.00 ppb
2018-12-181610-903-1255ND
2018-12-181610-905-0733ND
2018-12-181610-907-1020ND
2018-12-271610-900-09003.10 ppb
2018-12-271610-904-0851ND
2019-03-121610-901-0712ND
2019-03-121610-906-1230ND
2019-03-191610-902-09052.80 ppb
2019-03-191610-903-1010ND
2019-03-191610-905-0820ND
2019-03-191610-907-07252.90 ppb
2019-03-261610-900-1120ND
2019-03-261610-904-1050ND
2019-06-111610-901-0920ND
2019-06-111610-906-0855ND
2019-06-181610-902-0758ND
2019-06-181610-903-1010ND
2019-06-181610-905-0725ND
2019-06-181610-907-0810ND
2019-06-251610-900-0820ND
2019-06-251610-904-0845ND
2019-09-101610-901-0758ND
2019-09-101610-906-0920ND
2019-09-171610-902-1200ND
2019-09-171610-903-1055ND
2019-09-171610-905-1245ND
2019-09-171610-907-0725ND
2019-09-241610-900-0925ND
2019-09-241610-904-1105ND
2019-12-101610-901-1030ND
2019-12-101610-906-0803ND
2019-12-171610-902-1024ND
2019-12-171610-903-1035ND
2019-12-171610-905-1050ND
2019-12-171610-907-0752ND
2019-12-231610-900-0832ND
2019-12-231610-904-1100ND