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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

North Marin Water District

Trichloroacetic 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

 

233

Samples

0

Samples exceeding legal limit (MCL)

206

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.50 ppb3826ND - 16.1 ppb
20153.49 ppb4036ND - 10.9 ppb
20163.30 ppb3936ND - 7.50 ppb
20173.06 ppb3936ND - 8.50 ppb
20183.60 ppb38381.50 ppb - 26.8 ppb
20194.11 ppb3934ND - 8.80 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for trichloroacetic 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
2014-02-051610-001-1409ND
2014-02-051610-005-121316.1 ppb
2014-02-051610-006-11421.30 ppb
2014-02-051610-007-13152.30 ppb
2014-02-051610-008-1223ND
2014-02-051610-009-1135ND
2014-02-051610-014-1156ND
2014-02-051610-015-1336ND
2014-02-051610-017-13491.40 ppb
2014-05-071610-001-1343ND
2014-05-071610-004-14541.40 ppb
2014-05-071610-005-15072.10 ppb
2014-05-071610-006-13235.40 ppb
2014-05-071610-007-11565.10 ppb
2014-05-071610-008-1517ND
2014-05-071610-009-13164.70 ppb
2014-05-071610-014-13324.20 ppb
2014-05-071610-015-12484.60 ppb
2014-05-071610-017-13002.90 ppb
2014-08-061610-001-14121.70 ppb
2014-08-061610-004-12461.70 ppb
2014-08-061610-005-14261.90 ppb
2014-08-061610-006-11573.80 ppb
2014-08-061610-007-13424.40 ppb
2014-08-061610-008-13011.90 ppb
2014-08-061610-009-11484.80 ppb
2014-08-061610-014-12074.00 ppb
2014-08-061610-015-13254.30 ppb
2014-08-061610-017-13122.80 ppb
2014-11-051610-001-1345ND
2014-11-051610-005-12053.50 ppb
2014-11-051610-006-11422.80 ppb
2014-11-051610-007-13173.00 ppb
2014-11-051610-008-1240ND
2014-11-051610-009-1135ND
2014-11-051610-014-1152ND
2014-11-051610-015-1301ND
2014-11-051610-017-12522.90 ppb
2015-02-121610-001-13222.40 ppb
2015-02-121610-006-11345.20 ppb
2015-02-121610-007-12075.90 ppb
2015-02-121610-008-12552.10 ppb
2015-02-121610-009-11272.30 ppb
2015-02-121610-014-13117.10 ppb
2015-02-121610-015-12272.40 ppb
2015-02-121610-017-12405.20 ppb
2015-02-131610-004-11488.40 ppb
2015-02-131610-005-120010.9 ppb
2015-05-061610-001-1413ND
2015-05-061610-004-13543.60 ppb
2015-05-061610-005-11463.70 ppb
2015-05-061610-006-12176.40 ppb
2015-05-061610-007-12516.40 ppb
2015-05-061610-008-13385.30 ppb
2015-05-061610-009-12244.90 ppb
2015-05-061610-014-12077.40 ppb
2015-05-061610-015-13095.00 ppb
2015-05-061610-017-13215.80 ppb
2015-08-051610-001-1343ND
2015-08-051610-004-1139ND
2015-08-051610-005-13301.20 ppb
2015-08-051610-006-11061.70 ppb
2015-08-051610-007-12581.80 ppb
2015-08-051610-008-12141.40 ppb
2015-08-051610-009-10491.40 ppb
2015-08-051610-014-11181.30 ppb
2015-08-051610-015-12401.20 ppb
2015-08-051610-017-12271.20 ppb
2015-11-181610-001-1411ND
2015-11-181610-004-11342.80 ppb
2015-11-181610-005-13553.00 ppb
2015-11-181610-006-13184.60 ppb
2015-11-181610-007-12562.80 ppb
2015-11-181610-008-11592.40 ppb
2015-11-181610-009-13243.30 ppb
2015-11-181610-014-13342.90 ppb
2015-11-181610-015-12402.80 ppb
2015-11-181610-017-12123.20 ppb
2016-02-101610-001-13167.50 ppb
2016-02-101610-005-11545.50 ppb
2016-02-101610-006-12543.10 ppb
2016-02-101610-007-11095.50 ppb
2016-02-101610-008-12293.60 ppb
2016-02-101610-009-12475.00 ppb
2016-02-101610-014-13054.00 ppb
2016-02-101610-015-11283.20 ppb
2016-02-101610-017-11393.20 ppb
2016-05-111610-001-14181.20 ppb
2016-05-111610-004-15043.40 ppb
2016-05-111610-005-15165.20 ppb
2016-05-111610-006-13536.60 ppb
2016-05-111610-007-13335.40 ppb
2016-05-111610-008-12484.50 ppb
2016-05-111610-009-14004.70 ppb
2016-05-111610-014-14074.10 ppb
2016-05-111610-015-13124.00 ppb
2016-05-111610-017-13013.80 ppb
2016-08-101610-001-14011.40 ppb
2016-08-101610-004-1301ND
2016-08-101610-005-1315ND
2016-08-101610-006-11161.40 ppb
2016-08-101610-007-11362.20 ppb
2016-08-101610-008-1232ND
2016-08-101610-009-11111.60 ppb
2016-08-101610-014-13521.40 ppb
2016-08-101610-015-11581.40 ppb
2016-08-101610-017-12131.30 ppb
2016-11-091610-001-11541.70 ppb
2016-11-091610-004-12123.00 ppb
2016-11-091610-005-12303.50 ppb
2016-11-091610-006-11324.50 ppb
2016-11-091610-007-13354.40 ppb
2016-11-091610-008-12402.90 ppb
2016-11-091610-009-11154.30 ppb
2016-11-091610-014-11434.10 ppb
2016-11-091610-015-12522.80 ppb
2016-11-091610-017-13593.30 ppb
2017-02-081610-001-14443.50 ppb
2017-02-081610-005-12198.50 ppb
2017-02-081610-006-11395.20 ppb
2017-02-081610-007-14036.20 ppb
2017-02-081610-008-12273.80 ppb
2017-02-081610-009-11324.50 ppb
2017-02-081610-014-11524.30 ppb
2017-02-081610-015-13473.70 ppb
2017-02-081610-017-12465.20 ppb
2017-05-101610-001-12561.60 ppb
2017-05-101610-004-10411.50 ppb
2017-05-101610-005-13111.90 ppb
2017-05-101610-006-09402.80 ppb
2017-05-101610-007-11485.70 ppb
2017-05-101610-008-11071.60 ppb
2017-05-101610-009-09302.90 ppb
2017-05-101610-014-09503.20 ppb
2017-05-101610-015-11343.90 ppb
2017-05-101610-017-11224.20 ppb
2017-08-091610-001-16281.70 ppb
2017-08-091610-004-17013.40 ppb
2017-08-091610-005-17182.70 ppb
2017-08-091610-006-16033.70 ppb
2017-08-091610-007-14253.10 ppb
2017-08-091610-008-15242.60 ppb
2017-08-091610-009-15513.50 ppb
2017-08-091610-014-16163.60 ppb
2017-08-091610-015-14453.40 ppb
2017-08-091610-017-14593.50 ppb
2017-11-081610-001-1028ND
2017-11-081610-004-1046ND
2017-11-081610-005-10591.80 ppb
2017-11-081610-006-10092.10 ppb
2017-11-081610-007-11572.00 ppb
2017-11-081610-008-11082.10 ppb
2017-11-081610-009-10012.00 ppb
2017-11-081610-014-10192.10 ppb
2017-11-081610-015-1135ND
2017-11-081610-017-11212.00 ppb
2018-02-141610-001-13432.30 ppb
2018-02-141610-005-11594.50 ppb
2018-02-141610-006-11223.10 ppb
2018-02-141610-007-12413.30 ppb
2018-02-141610-008-11462.50 ppb
2018-02-141610-009-11153.10 ppb
2018-02-141610-014-11333.70 ppb
2018-02-141610-015-12272.70 ppb
2018-02-141610-017-12133.10 ppb
2018-05-091610-001-15331.60 ppb
2018-05-091610-004-14452.20 ppb
2018-05-091610-005-15112.20 ppb
2018-05-091610-006-14004.10 ppb
2018-05-091610-007-12154.30 ppb
2018-05-091610-008-13142.50 ppb
2018-05-091610-009-13473.70 ppb
2018-05-091610-014-13303.70 ppb
2018-05-091610-015-12352.10 ppb
2018-05-091610-017-12563.80 ppb
2018-08-151610-001-11152.30 ppb
2018-08-151610-005-11435.40 ppb
2018-08-151610-006-10563.50 ppb
2018-08-151610-007-12352.90 ppb
2018-08-151610-008-11511.80 ppb
2018-08-151610-009-10491.90 ppb
2018-08-151610-014-11063.20 ppb
2018-08-151610-015-12202.40 ppb
2018-08-151610-017-12053.00 ppb
2018-08-161610-004-10101.50 ppb
2018-11-161610-001-11391.70 ppb
2018-11-161610-005-152826.8 ppb
2018-11-161610-006-12402.40 ppb
2018-11-161610-007-14213.50 ppb
2018-11-161610-008-13013.10 ppb
2018-11-161610-009-12222.60 ppb
2018-11-161610-014-12031.90 ppb
2018-11-161610-015-13494.30 ppb
2018-11-161610-017-13284.00 ppb
2019-02-201610-001-14595.00 ppb
2019-02-201610-005-1305ND
2019-02-201610-006-12366.90 ppb
2019-02-201610-007-14246.20 ppb
2019-02-201610-008-13355.50 ppb
2019-02-201610-009-12266.60 ppb
2019-02-201610-014-12497.30 ppb
2019-02-201610-015-14055.60 ppb
2019-02-201610-017-13487.30 ppb
2019-05-081610-001-16001.60 ppb
2019-05-081610-004-14453.20 ppb
2019-05-081610-005-15004.40 ppb
2019-05-081610-006-12553.90 ppb
2019-05-081610-007-13308.80 ppb
2019-05-081610-008-15415.70 ppb
2019-05-081610-009-13106.60 ppb
2019-05-081610-014-12378.10 ppb
2019-05-081610-015-13518.40 ppb
2019-05-081610-017-14108.80 ppb
2019-08-141610-001-13422.00 ppb
2019-08-141610-004-1431ND
2019-08-141610-005-1255ND
2019-08-141610-006-11432.20 ppb
2019-08-141610-007-12102.30 ppb
2019-08-141610-008-1304ND
2019-08-141610-009-11332.20 ppb
2019-08-141610-014-11542.20 ppb
2019-08-141610-015-1226ND
2019-08-141610-017-12402.10 ppb
2019-11-131610-001-11552.00 ppb
2019-11-131610-004-12122.60 ppb
2019-11-131610-005-12242.80 ppb
2019-11-131610-006-11345.30 ppb
2019-11-131610-007-13154.30 ppb
2019-11-131610-008-12353.00 ppb
2019-11-131610-009-11254.80 ppb
2019-11-131610-014-11465.00 ppb
2019-11-131610-015-13023.20 ppb
2019-11-131610-017-12494.30 ppb