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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

California Water Service - Bear Gulch

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

 

221

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
20141.48 ppb3116ND - 5.30 ppb
20150.376 ppb376ND - 2.50 ppb
20160.951 ppb3915ND - 3.20 ppb
20170.477 ppb398ND - 2.60 ppb
20180.543 ppb379ND - 2.60 ppb
20190.674 ppb3810ND - 3.10 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
2014-03-105810-908-1139ND
2014-03-105810-909-1210ND
2014-03-125810-900-1003ND
2014-03-125810-904-1052ND
2014-06-115810-900-11183.20 ppb
2014-06-115810-901-11582.70 ppb
2014-06-115810-902-10313.00 ppb
2014-06-115810-903-11402.90 ppb
2014-06-115810-903-12203.20 ppb
2014-06-115810-904-09443.10 ppb
2014-06-115810-905-10093.10 ppb
2014-06-115810-908-11375.30 ppb
2014-06-115810-909-11084.10 ppb
2014-09-085810-900-1247ND
2014-09-085810-901-1047ND
2014-09-085810-902-1517ND
2014-09-085810-903-1014ND
2014-09-085810-908-11452.20 ppb
2014-09-085810-909-12432.30 ppb
2014-09-105810-904-1203ND
2014-09-105810-905-1023ND
2014-09-105810-906-1010ND
2014-12-085810-900-1040ND
2014-12-085810-901-0950ND
2014-12-085810-902-1135ND
2014-12-085810-903-09362.20 ppb
2014-12-085810-903-10002.10 ppb
2014-12-085810-904-11432.10 ppb
2014-12-085810-905-12082.20 ppb
2014-12-085810-908-1035ND
2014-12-085810-909-10152.30 ppb
2015-03-105810-900-1214ND
2015-03-105810-901-10402.40 ppb
2015-03-105810-902-1152ND
2015-03-105810-903-10252.50 ppb
2015-03-105810-904-11162.40 ppb
2015-03-105810-905-10562.10 ppb
2015-03-105810-906-12592.10 ppb
2015-03-105810-907-09252.40 ppb
2015-03-105810-908-1449ND
2015-03-105810-909-1314ND
2015-06-105810-900-0945ND
2015-06-105810-901-1030ND
2015-06-105810-902-1000ND
2015-06-105810-903-1049ND
2015-06-105810-904-0951ND
2015-06-105810-905-1000ND
2015-06-105810-906-1015ND
2015-06-105810-908-1115ND
2015-06-105810-909-1055ND
2015-09-165810-900-1152ND
2015-09-165810-901-0922ND
2015-09-165810-902-1205ND
2015-09-165810-903-1050ND
2015-09-165810-904-1220ND
2015-09-165810-905-1303ND
2015-09-165810-906-0957ND
2015-09-165810-908-1044ND
2015-09-165810-909-0916ND
2015-12-145810-900-1118ND
2015-12-145810-901-1055ND
2015-12-145810-902-1151ND
2015-12-145810-903-1020ND
2015-12-145810-904-1222ND
2015-12-145810-905-1243ND
2015-12-145810-906-1110ND
2015-12-145810-908-1140ND
2015-12-145810-909-1125ND
2016-03-165810-900-1140ND
2016-03-165810-901-12132.70 ppb
2016-03-165810-902-12003.20 ppb
2016-03-165810-903-12332.70 ppb
2016-03-165810-904-1313ND
2016-03-165810-905-1406ND
2016-03-165810-906-11583.00 ppb
2016-03-165810-907-13433.00 ppb
2016-03-165810-908-10582.00 ppb
2016-03-165810-909-11002.20 ppb
2016-04-125810-907-1412ND
2016-06-145810-908-1125ND
2016-06-145810-909-13492.80 ppb
2016-06-165810-900-1458ND
2016-06-165810-901-12362.30 ppb
2016-06-165810-902-15252.20 ppb
2016-06-165810-903-11052.10 ppb
2016-06-165810-904-1602ND
2016-06-165810-905-1622ND
2016-06-165810-906-12552.30 ppb
2016-06-165810-907-1412ND
2016-09-145810-900-12022.30 ppb
2016-09-145810-901-1030ND
2016-09-145810-902-1311ND
2016-09-145810-903-1055ND
2016-09-145810-904-1034ND
2016-09-145810-905-1406ND
2016-09-145810-906-1043ND
2016-09-145810-908-1130ND
2016-09-145810-909-1202ND
2016-12-145810-900-1346ND
2016-12-145810-901-1217ND
2016-12-145810-902-1404ND
2016-12-145810-903-1313ND
2016-12-145810-904-1257ND
2016-12-145810-905-11452.00 ppb
2016-12-145810-906-1206ND
2016-12-145810-908-1108ND
2016-12-145810-909-11522.30 ppb
2017-03-135810-900-1344ND
2017-03-135810-901-1312ND
2017-03-135810-902-1358ND
2017-03-135810-903-1247ND
2017-03-135810-904-1425ND
2017-03-135810-905-1443ND
2017-03-135810-906-1325ND
2017-03-135810-907-1520ND
2017-03-135810-908-1139ND
2017-03-135810-909-1229ND
2017-06-165810-900-1254ND
2017-06-165810-901-12482.50 ppb
2017-06-165810-902-13262.10 ppb
2017-06-165810-903-1136ND
2017-06-165810-904-13552.20 ppb
2017-06-165810-905-14292.60 ppb
2017-06-165810-906-13062.30 ppb
2017-06-165810-907-10312.50 ppb
2017-06-165810-908-1451ND
2017-06-165810-909-15332.20 ppb
2017-09-115810-900-1330ND
2017-09-115810-901-1036ND
2017-09-115810-902-1215ND
2017-09-115810-903-0950ND
2017-09-115810-904-1434ND
2017-09-115810-905-1518ND
2017-09-115810-906-1050ND
2017-09-115810-908-1201ND
2017-09-115810-909-1300ND
2017-12-125810-900-1325ND
2017-12-125810-901-1112ND
2017-12-125810-902-1303ND
2017-12-125810-903-1052ND
2017-12-125810-904-1243ND
2017-12-125810-905-12182.20 ppb
2017-12-125810-906-1126ND
2017-12-125810-907-1338ND
2017-12-125810-908-1454ND
2017-12-125810-909-1423ND
2018-02-225810-907-0929ND
2018-03-145810-900-1059ND
2018-03-145810-901-1218ND
2018-03-145810-902-1125ND
2018-03-145810-903-1059ND
2018-03-145810-904-1206ND
2018-03-145810-905-1244ND
2018-03-145810-906-1243ND
2018-03-145810-908-1327ND
2018-03-145810-909-1255ND
2018-06-115810-900-1219ND
2018-06-115810-901-09512.30 ppb
2018-06-115810-902-1409ND
2018-06-115810-903-09212.00 ppb
2018-06-115810-904-13142.20 ppb
2018-06-115810-905-12552.60 ppb
2018-06-115810-906-10072.10 ppb
2018-06-115810-908-12512.20 ppb
2018-06-115810-909-12212.30 ppb
2018-09-135810-900-12332.00 ppb
2018-09-135810-901-1219ND
2018-09-135810-902-1253ND
2018-09-135810-903-1134ND
2018-09-135810-904-1343ND
2018-09-135810-905-1402ND
2018-09-135810-906-12022.40 ppb
2018-09-175810-908-1250ND
2018-09-175810-909-1318ND
2018-12-105810-900-1241ND
2018-12-105810-901-1054ND
2018-12-105810-902-1301ND
2018-12-105810-903-1020ND
2018-12-105810-904-1359ND
2018-12-105810-905-1415ND
2018-12-105810-906-1106ND
2018-12-105810-908-1151ND
2018-12-105810-909-1126ND
2019-03-135810-900-11552.50 ppb
2019-03-135810-901-1255ND
2019-03-135810-902-1218ND
2019-03-135810-903-1035ND
2019-03-135810-904-1432ND
2019-03-135810-905-1101ND
2019-03-135810-906-1306ND
2019-03-135810-908-1348ND
2019-03-135810-909-1326ND
2019-03-185810-907-13442.80 ppb
2019-06-105810-900-11482.70 ppb
2019-06-105810-901-1009ND
2019-06-105810-902-12242.70 ppb
2019-06-105810-903-09482.70 ppb
2019-06-105810-904-12363.10 ppb
2019-06-105810-905-13032.90 ppb
2019-06-105810-906-1024ND
2019-06-105810-908-1100ND
2019-06-105810-909-1038ND
2019-06-185810-910-1201ND
2019-09-095810-900-1232ND
2019-09-095810-901-1057ND
2019-09-095810-902-1257ND
2019-09-095810-903-1022ND
2019-09-095810-904-1405ND
2019-09-095810-905-1315ND
2019-09-095810-906-1120ND
2019-09-105810-908-1150ND
2019-09-105810-909-11142.10 ppb
2019-12-095810-900-1154ND
2019-12-095810-901-1111ND
2019-12-095810-902-12202.00 ppb
2019-12-095810-903-1319ND
2019-12-095810-904-1229ND
2019-12-095810-905-12422.10 ppb
2019-12-095810-906-1101ND
2019-12-095810-908-1033ND
2019-12-095810-909-1048ND