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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

California Water Service - Livermore

Chloroform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Chloroform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Read More.

In addition to tap water disinfection, chloroform pollution in the environment also comes from industrial discharges from pulp and paper mills, and from urban wastewater effluent. Human studies show that chloroform damages the kidneys, liver and central nervous system. In animals, chloroform causes infertility, birth defects and cancer.

Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

499

Samples

0

Samples exceeding legal limit (MCL)

111

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND720ND
20150.00893 ppb561ND - 0.500 ppb
20161.91 ppb9227ND - 15.2 ppb
20172.27 ppb7427ND - 10.3 ppb
20180.986 ppb10726ND - 9.03 ppb
20192.11 ppb9830ND - 15.5 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as 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
2014-01-225701-010-1405ND
2014-01-225701-024-1415ND
2014-01-225701-025-1410ND
2014-01-235701-006-1303ND
2014-01-235701-007-1020ND
2014-02-255701-010-1032ND
2014-02-255701-024-1047ND
2014-02-255701-025-1045ND
2014-03-165701-010-1352ND
2014-03-165701-024-1400ND
2014-03-165701-025-1405ND
2014-04-215701-008-1025ND
2014-04-215701-022-1035ND
2014-04-215701-023-1040ND
2014-04-235701-010-1125ND
2014-04-235701-024-1120ND
2014-04-235701-025-1123ND
2014-04-245701-006-1625ND
2014-04-245701-021-1420ND
2014-05-135701-010-1343ND
2014-05-135701-024-1344ND
2014-05-135701-025-1336ND
2014-05-275701-008-1010ND
2014-05-275701-022-1017ND
2014-05-275701-023-1025ND
2014-06-105701-010-1117ND
2014-06-105701-024-1138ND
2014-06-105701-025-1133ND
2014-06-125701-008-1231ND
2014-06-125701-022-1248ND
2014-06-125701-023-1239ND
2014-07-105701-008-0959ND
2014-07-105701-010-1127ND
2014-07-105701-022-1016ND
2014-07-105701-023-1008ND
2014-07-105701-024-1141ND
2014-07-105701-025-1132ND
2014-07-235701-006-1545ND
2014-07-235701-021-1526ND
2014-08-065701-008-1042ND
2014-08-069590-010-1120ND
2014-08-065701-022-1055ND
2014-08-065701-023-1049ND
2014-08-069590-024-1135ND
2014-08-069590-025-1127ND
2014-09-115701-008-1131ND
2014-09-115701-010-1545ND
2014-09-115701-022-1139ND
2014-09-115701-023-1135ND
2014-09-115701-024-1554ND
2014-09-115701-025-1550ND
2014-10-159590-008-1035ND
2014-10-155701-010-0949ND
2014-10-159590-022-1044ND
2014-10-159590-023-1039ND
2014-10-155701-024-0956ND
2014-10-155701-025-1000ND
2014-10-275701-021-1418ND
2014-11-055701-008-1011ND
2014-11-055701-010-1242ND
2014-11-055701-022-1000ND
2014-11-055701-023-1005ND
2014-11-055701-024-1251ND
2014-11-055701-025-1257ND
2014-12-105701-010-1220ND
2014-12-105701-024-1229ND
2014-12-105701-025-1224ND
2014-12-155701-006-1650ND
2014-12-175701-008-1208ND
2014-12-175701-022-1212ND
2014-12-175701-023-1218ND
2014-12-189590-009-1355ND
2015-01-135701-008-1425ND
2015-01-135701-022-1400ND
2015-01-135701-023-1405ND
2015-01-215701-010-1320ND
2015-01-215701-024-1327ND
2015-01-215701-025-1328ND
2015-01-275701-006-1602ND
2015-01-275701-021-1426ND
2015-02-185701-008-1650ND
2015-02-185701-022-1653ND
2015-02-185701-023-1652ND
2015-02-245701-010-1324ND
2015-02-245701-024-1350ND
2015-02-245701-025-1345ND
2015-03-165701-008-1523ND
2015-03-165701-010-16000.500 ppb
2015-03-165701-022-1530ND
2015-03-165701-023-1535ND
2015-03-165701-024-1611ND
2015-03-165701-025-1605ND
2015-04-145701-008-1040ND
2015-04-145701-010-1420ND
2015-04-145701-022-1112ND
2015-04-145701-023-1107ND
2015-04-145701-024-1437ND
2015-04-145701-025-1429ND
2015-04-275701-006-1341ND
2015-05-129590-008-1215ND
2015-05-129590-022-1226ND
2015-05-129590-023-1221ND
2015-05-185701-009-1105ND
2015-06-085701-008-1100ND
2015-06-085701-022-1110ND
2015-06-085701-023-1106ND
2015-07-075701-008-1248ND
2015-07-075701-022-1259ND
2015-07-075701-023-1303ND
2015-07-215701-006-1050ND
2015-08-105701-008-1259ND
2015-08-105701-022-1308ND
2015-08-105701-023-1304ND
2015-09-095701-008-1205ND
2015-09-095701-022-1216ND
2015-09-095701-023-1213ND
2015-10-145701-008-0930ND
2015-10-145701-022-0950ND
2015-10-145701-023-0944ND
2015-10-195701-006-1115ND
2015-10-195701-021-1016ND
2015-11-095701-008-1142ND
2015-11-095701-022-1151ND
2015-11-095701-023-1150ND
2015-12-095701-014-1120ND
2015-12-155701-008-1535ND
2015-12-155701-022-1515ND
2015-12-155701-023-1520ND
2016-01-135701-008-1100ND
2016-01-135701-022-1110ND
2016-01-135701-023-1112ND
2016-01-205701-021-0905ND
2016-02-115701-008-1400ND
2016-02-115701-022-1403ND
2016-02-115701-023-1402ND
2016-02-185701-801-08253.29 ppb
2016-02-185701-802-0825ND
2016-02-185701-803-08255.17 ppb
2016-02-185701-804-08256.72 ppb
2016-02-185701-805-08254.92 ppb
2016-02-185701-806-0825ND
2016-02-185701-807-08253.40 ppb
2016-02-185701-808-08252.52 ppb
2016-03-155701-008-1015ND
2016-03-155701-022-1010ND
2016-03-155701-023-1005ND
2016-04-045701-008-0950ND
2016-04-045701-022-0958ND
2016-04-045701-023-0956ND
2016-04-185701-021-1141ND
2016-05-045701-008-1430ND
2016-05-045701-022-1441ND
2016-05-045701-023-1447ND
2016-05-165701-801-09105.93 ppb
2016-05-165701-802-0910ND
2016-05-165701-803-09105.29 ppb
2016-05-165701-804-09109.37 ppb
2016-05-165701-805-09105.51 ppb
2016-05-165701-806-09106.11 ppb
2016-05-165701-807-09106.10 ppb
2016-05-165701-808-09105.39 ppb
2016-05-235701-010-1102ND
2016-05-235701-024-1059ND
2016-05-235701-025-1100ND
2016-07-065701-010-1317ND
2016-07-065701-024-1328ND
2016-07-065701-025-1323ND
2016-07-135701-008-1530ND
2016-07-135701-022-1535ND
2016-07-135701-023-1545ND
2016-07-205701-006-1135ND
2016-07-205701-015-1120ND
2016-07-205701-021-1105ND
2016-08-035701-008-1417ND
2016-08-035701-010-1440ND
2016-08-035701-022-1415ND
2016-08-035701-023-1416ND
2016-08-035701-024-1442ND
2016-08-035701-025-1441ND
2016-08-175810-801-10254.40 ppb
2016-08-175810-802-0928ND
2016-08-175810-803-11233.20 ppb
2016-08-175810-804-09113.00 ppb
2016-08-175810-805-09573.10 ppb
2016-08-175810-806-09434.00 ppb
2016-08-175810-807-11082.80 ppb
2016-08-175810-808-10482.50 ppb
2016-09-135701-008-1355ND
2016-09-135701-010-1115ND
2016-09-135701-022-1347ND
2016-09-135701-023-1350ND
2016-09-135701-024-1130ND
2016-09-135701-025-1118ND
2016-10-135701-008-1520ND
2016-10-135701-010-1042ND
2016-10-135701-022-1530ND
2016-10-135701-023-1529ND
2016-10-135701-024-1050ND
2016-10-135701-025-1055ND
2016-10-255701-021-1527ND
2016-11-155701-008-1540ND
2016-11-155701-010-1415ND
2016-11-155701-022-1515ND
2016-11-155701-023-1525ND
2016-11-155701-024-1357ND
2016-11-155701-025-1351ND
2016-11-215701-801-083211.9 ppb
2016-11-215701-802-0832ND
2016-11-215701-803-08326.12 ppb
2016-11-215701-804-083215.2 ppb
2016-11-215701-805-083214.2 ppb
2016-11-215701-806-083215.0 ppb
2016-11-215701-807-083213.1 ppb
2016-11-215701-808-08327.18 ppb
2016-12-135701-008-1119ND
2016-12-135810-010-1305ND
2016-12-135701-022-1117ND
2016-12-135701-023-1118ND
2016-12-135810-024-1307ND
2016-12-135810-025-1306ND
2017-01-175701-008-1007ND
2017-01-175701-022-1009ND
2017-01-175701-023-1008ND
2017-01-255701-021-1140ND
2017-02-079590-008-1412ND
2017-02-079590-022-1411ND
2017-02-079590-023-1411ND
2017-02-225701-801-08188.40 ppb
2017-02-225701-802-0818ND
2017-02-225701-803-08189.70 ppb
2017-02-225701-804-08189.62 ppb
2017-02-225701-805-081810.3 ppb
2017-02-225701-806-081810.0 ppb
2017-02-225701-807-08189.71 ppb
2017-02-225701-808-08188.55 ppb
2017-03-075701-008-1420ND
2017-03-075701-022-1407ND
2017-03-075701-023-1412ND
2017-04-195701-008-1532ND
2017-04-195701-021-1547ND
2017-04-195701-022-1530ND
2017-04-195701-023-1532ND
2017-05-095701-008-1542ND
2017-05-095701-022-1529ND
2017-05-095701-023-1525ND
2017-05-155701-008-1450ND
2017-05-155701-022-1455ND
2017-05-175701-801-08435.29 ppb
2017-05-175701-802-0843ND
2017-05-175701-803-08434.76 ppb
2017-05-175701-805-08435.12 ppb
2017-05-175701-806-08434.50 ppb
2017-05-175701-807-08436.04 ppb
2017-05-175701-808-08434.30 ppb
2017-05-185701-804-08439.27 ppb
2017-06-145701-008-1046ND
2017-06-145701-022-1042ND
2017-06-145701-023-1043ND
2017-07-115701-008-1031ND
2017-07-115701-022-1028ND
2017-07-115701-023-1029ND
2017-07-255701-021-1344ND
2017-08-095701-008-1520ND
2017-08-095701-022-1510ND
2017-08-095701-023-1515ND
2017-08-225810-801-13045.50 ppb
2017-08-225810-802-11404.60 ppb
2017-08-225810-803-10085.50 ppb
2017-08-225810-804-10305.60 ppb
2017-08-225810-805-12475.50 ppb
2017-08-225810-806-14085.20 ppb
2017-08-225810-807-13345.30 ppb
2017-08-225810-808-13504.70 ppb
2017-09-125701-008-1013ND
2017-09-125701-022-1011ND
2017-09-125701-023-1012ND
2017-10-105701-008-1231ND
2017-10-105701-022-1229ND
2017-10-105701-023-1230ND
2017-10-235701-021-1310ND
2017-11-145810-008-1305ND
2017-11-145810-022-1315ND
2017-11-145810-023-1310ND
2017-11-205810-801-11454.80 ppb
2017-11-205810-802-1318ND
2017-11-205810-803-10053.10 ppb
2017-11-205810-805-14153.30 ppb
2017-11-205810-806-1424ND
2017-11-205810-807-14324.80 ppb
2017-11-205810-808-14484.30 ppb
2017-12-125701-008-0948ND
2017-12-125701-022-0946ND
2017-12-125701-023-0947ND
2017-12-189590-007-1359ND
2018-01-055701-010-1350ND
2018-01-055701-024-1351ND
2018-01-055701-025-1350ND
2018-01-245701-021-1312ND
2018-01-295701-022-1045ND
2018-01-295701-023-1046ND
2018-02-135701-008-1117ND
2018-02-135701-022-1115ND
2018-02-135701-023-1116ND
2018-02-205810-801-13155.90 ppb
2018-02-205810-802-1137ND
2018-02-205810-803-10361.10 ppb
2018-02-205810-805-12466.20 ppb
2018-02-205810-806-1508ND
2018-02-205810-807-14256.20 ppb
2018-02-205810-808-14385.90 ppb
2018-02-215701-010-1750ND
2018-02-215701-024-1800ND
2018-02-215701-025-1755ND
2018-03-065701-008-0930ND
2018-03-065701-010-1150ND
2018-03-065701-022-0929ND
2018-03-065701-023-0927ND
2018-03-065701-024-1200ND
2018-03-065701-025-1155ND
2018-03-225701-008-0950ND
2018-03-225701-022-0940ND
2018-03-225701-023-0930ND
2018-04-125810-008-1330ND
2018-04-125810-010-1301ND
2018-04-125810-022-1336ND
2018-04-125810-023-1333ND
2018-04-125810-024-1305ND
2018-04-125810-025-1303ND
2018-05-019590-021-1438ND
2018-05-175701-008-0926ND
2018-05-175701-022-0932ND
2018-05-175701-023-0930ND
2018-05-235701-805-09566.95 ppb
2018-05-235701-806-09564.13 ppb
2018-05-235701-807-09567.82 ppb
2018-05-235701-808-09567.27 ppb
2018-05-255701-801-11487.02 ppb
2018-05-255701-802-1149ND
2018-05-255701-803-11495.04 ppb
2018-05-255701-804-11509.03 ppb
2018-06-115701-008-1600ND
2018-06-115701-010-1548ND
2018-06-115701-022-1557ND
2018-06-115701-023-1558ND
2018-06-115701-024-1549ND
2018-06-115701-025-1546ND
2018-07-025810-008-1134ND
2018-07-025810-022-1136ND
2018-07-025810-023-1140ND
2018-07-115810-010-1356ND
2018-07-115810-024-1400ND
2018-07-115810-025-1402ND
2018-07-245701-014-0917ND
2018-07-245701-021-0850ND
2018-08-135701-008-1420ND
2018-08-135701-022-1426ND
2018-08-135701-023-1423ND
2018-08-145701-010-1016ND
2018-08-145701-024-1020ND
2018-08-145701-025-1022ND
2018-08-225701-801-08193.65 ppb
2018-08-225701-802-08192.36 ppb
2018-08-225701-803-08192.98 ppb
2018-08-225701-804-08194.00 ppb
2018-08-225701-805-08193.49 ppb
2018-08-225701-806-0819ND
2018-08-225701-807-08193.36 ppb
2018-08-225701-808-08193.16 ppb
2018-09-115701-008-1002ND
2018-09-115701-022-1009ND
2018-09-115701-023-1006ND
2018-09-125701-010-1418ND
2018-09-125701-024-1422ND
2018-09-125701-025-1424ND
2018-10-115701-008-1315ND
2018-10-115701-010-1340ND
2018-10-115701-022-1321ND
2018-10-115701-023-1319ND
2018-10-115701-024-1344ND
2018-10-115701-025-1346ND
2018-10-165810-021-1337ND
2018-11-155701-008-1500ND
2018-11-155701-010-0900ND
2018-11-155701-022-1506ND
2018-11-155701-023-1504ND
2018-11-155701-024-0904ND
2018-11-155701-025-0906ND
2018-11-205701-801-07541.53 ppb
2018-11-205701-802-07540.530 ppb
2018-11-205701-803-07541.49 ppb
2018-11-205701-804-07541.54 ppb
2018-11-205701-805-07541.48 ppb
2018-11-205701-806-0754ND
2018-11-205701-807-07541.53 ppb
2018-11-205701-808-07541.88 ppb
2018-12-115810-008-1515ND
2018-12-115810-022-1452ND
2018-12-115810-023-1458ND
2018-12-125810-010-1314ND
2018-12-125810-024-1326ND
2018-12-125810-025-1329ND
2019-01-085810-008-1345ND
2019-01-085810-010-0955ND
2019-01-085810-022-1405ND
2019-01-085810-023-1400ND
2019-01-085810-024-1010ND
2019-01-085810-025-1005ND
2019-01-239590-021-1150ND
2019-02-135701-008-1358ND
2019-02-135701-010-1325ND
2019-02-135701-022-1406ND
2019-02-135701-023-1404ND
2019-02-135701-024-1331ND
2019-02-135701-025-1329ND
2019-02-205701-801-10036.25 ppb
2019-02-205701-802-10031.50 ppb
2019-02-205701-803-10037.15 ppb
2019-02-205701-805-10038.85 ppb
2019-02-205701-806-10038.31 ppb
2019-02-205701-807-10038.56 ppb
2019-02-205701-808-10036.47 ppb
2019-03-125701-008-1439ND
2019-03-125701-022-1449ND
2019-03-125701-023-1444ND
2019-04-045810-013-1250ND
2019-04-165701-008-1233ND
2019-04-165701-022-1240ND
2019-04-165701-023-1237ND
2019-04-295701-021-0928ND
2019-05-155701-008-1458ND
2019-05-155701-010-1233ND
2019-05-155701-022-1506ND
2019-05-155701-023-1502ND
2019-05-155701-024-1238ND
2019-05-155701-025-1235ND
2019-05-215701-801-090215.5 ppb
2019-05-215701-802-09024.32 ppb
2019-05-215701-803-090212.1 ppb
2019-05-215701-804-09029.07 ppb
2019-05-215701-805-090210.8 ppb
2019-05-215701-806-090211.8 ppb
2019-05-215701-807-090214.8 ppb
2019-05-215701-808-090215.5 ppb
2019-06-125701-008-0949ND
2019-06-125701-022-1056ND
2019-06-125701-023-1053ND
2019-07-025701-010-1550ND
2019-07-025701-024-1611ND
2019-07-025701-025-1559ND
2019-07-115701-008-1412ND
2019-07-115701-010-0958ND
2019-07-115701-022-1417ND
2019-07-115701-023-1419ND
2019-07-115701-024-1010ND
2019-07-115701-025-1006ND
2019-07-245701-021-1452ND
2019-08-155701-008-1432ND
2019-08-155701-010-1409ND
2019-08-155701-022-1443ND
2019-08-155701-023-1439ND
2019-08-155701-024-1416ND
2019-08-155701-025-1420ND
2019-08-205701-801-11304.65 ppb
2019-08-205701-802-12574.58 ppb
2019-08-205701-803-14106.39 ppb
2019-08-205701-804-14285.10 ppb
2019-08-205701-805-09464.78 ppb
2019-08-205701-806-09124.98 ppb
2019-08-205701-807-10025.69 ppb
2019-08-205701-808-10324.63 ppb
2019-09-125701-008-1400ND
2019-09-125701-010-1120ND
2019-09-125701-022-1330ND
2019-09-125701-023-1333ND
2019-09-125701-024-1128ND
2019-09-125701-025-1125ND
2019-10-025701-008-0955ND
2019-10-025701-010-0901ND
2019-10-025701-022-1004ND
2019-10-025701-023-0958ND
2019-10-025701-024-0908ND
2019-10-025701-025-0905ND
2019-10-165701-021-1024ND
2019-10-305701-015-1151ND
2019-11-135701-010-1109ND
2019-11-135701-024-1114ND
2019-11-135701-025-1111ND
2019-11-195701-801-14183.54 ppb
2019-11-195701-802-1059ND
2019-11-195701-803-12344.34 ppb
2019-11-195701-804-12485.79 ppb
2019-11-195701-805-13411.79 ppb
2019-11-195701-806-13251.47 ppb
2019-11-195701-807-13574.37 ppb
2019-11-195701-808-14333.44 ppb
2019-12-105701-015-1320ND
2019-12-185701-010-1148ND
2019-12-185701-024-1152ND
2019-12-185701-025-1155ND