Chloroform
Cal-water Service Company - Marysville
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | 0.0639 ppb | 70 | 4 | ND - 2.80 ppb |
2015 | 0.0691 ppb | 58 | 4 | ND - 1.41 ppb |
2016 | 0.127 ppb | 48 | 9 | ND - 0.850 ppb |
2017 | 0.0425 ppb | 48 | 3 | ND - 0.830 ppb |
2018 | 0.0598 ppb | 52 | 5 | ND - 0.650 ppb |
2019 | 0.0121 ppb | 48 | 1 | ND - 0.580 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 |
---|---|---|
2014-01-06 | 5701-011-0952 | ND |
2014-01-06 | 5701-011-0956 | ND |
2014-01-06 | 5701-023-1004 | ND |
2014-01-13 | 5701-011-1327 | ND |
2014-01-22 | 5701-013-1140 | ND |
2014-02-11 | 5701-011-0914 | ND |
2014-02-18 | 5701-010-1045 | ND |
2014-02-26 | 5701-015-1006 | ND |
2014-03-03 | 5701-011-1530 | ND |
2014-03-04 | 5701-027-1448 | 0.530 ppb |
2014-03-04 | 5701-028-1516 | ND |
2014-03-04 | 5701-029-1438 | ND |
2014-04-07 | 5701-011-1521 | ND |
2014-04-15 | 5701-013-1501 | ND |
2014-05-01 | 5810-011-1115 | ND |
2014-05-01 | 5810-023-1123 | ND |
2014-05-06 | 5701-011-0938 | ND |
2014-05-12 | 5701-011-0950 | ND |
2014-05-19 | 5701-011-0852 | ND |
2014-05-19 | 5701-015-1117 | ND |
2014-05-27 | 5701-011-1156 | ND |
2014-06-02 | 5701-011-0847 | ND |
2014-06-02 | 5701-027-1426 | ND |
2014-06-02 | 5701-028-1414 | ND |
2014-06-02 | 5701-029-1442 | ND |
2014-06-10 | 5701-011-0905 | ND |
2014-06-16 | 5701-011-0904 | ND |
2014-06-23 | 5701-011-1421 | ND |
2014-06-23 | 5810-011-1436 | ND |
2014-06-23 | 5810-023-1427 | 2.80 ppb |
2014-07-01 | 5701-011-1312 | ND |
2014-07-07 | 5701-011-1344 | ND |
2014-07-14 | 5701-011-0832 | ND |
2014-07-21 | 5701-011-0913 | ND |
2014-07-22 | 5701-013-1033 | ND |
2014-07-22 | 5701-016-1145 | ND |
2014-07-28 | 5701-011-0912 | ND |
2014-08-04 | 5701-011-1003 | ND |
2014-08-11 | 5810-011-0941 | ND |
2014-08-11 | 5810-023-0946 | ND |
2014-08-18 | 5701-011-0913 | ND |
2014-08-26 | 5701-011-0935 | ND |
2014-09-02 | 5701-011-0900 | ND |
2014-09-03 | 5701-027-1510 | ND |
2014-09-03 | 5701-028-1457 | ND |
2014-09-03 | 5701-029-1546 | ND |
2014-09-08 | 5701-011-0959 | ND |
2014-09-15 | 5701-011-0951 | ND |
2014-09-22 | 5701-011-0943 | ND |
2014-09-29 | 5701-011-0904 | ND |
2014-10-06 | 5701-011-0907 | ND |
2014-10-13 | 5701-011-0901 | ND |
2014-10-20 | 9590-011-0916 | ND |
2014-10-20 | 9590-013-1403 | ND |
2014-10-27 | 5701-011-0930 | ND |
2014-11-03 | 5701-011-1458 | ND |
2014-11-12 | 5701-011-0848 | ND |
2014-11-16 | 5701-015-1042 | ND |
2014-11-17 | 5701-011-1029 | ND |
2014-11-24 | 5701-011-1009 | ND |
2014-12-01 | 5701-011-0934 | ND |
2014-12-03 | 5701-027-1257 | 0.610 ppb |
2014-12-03 | 5701-028-1316 | 0.530 ppb |
2014-12-03 | 5701-029-1239 | ND |
2014-12-03 | 5701-030-1226 | ND |
2014-12-08 | 5701-011-1032 | ND |
2014-12-15 | 5701-011-1011 | ND |
2014-12-22 | 9590-011-0954 | ND |
2014-12-30 | 9590-011-1043 | ND |
2014-12-30 | 9590-023-1046 | ND |
2015-01-05 | 5701-011-0947 | ND |
2015-01-05 | 5701-023-0950 | ND |
2015-01-13 | 5701-011-1003 | ND |
2015-01-13 | 5701-023-1007 | ND |
2015-01-20 | 5701-011-1311 | ND |
2015-01-20 | 5701-023-1315 | ND |
2015-01-22 | 5701-009-1339 | ND |
2015-01-22 | 5701-013-1356 | ND |
2015-01-26 | 5701-011-1402 | ND |
2015-01-26 | 5701-023-1408 | ND |
2015-02-02 | 5701-011-0945 | ND |
2015-02-02 | 5701-023-0948 | ND |
2015-02-18 | 5701-015-1032 | ND |
2015-03-02 | 5701-011-1316 | ND |
2015-03-02 | 5701-023-1319 | ND |
2015-03-02 | 5701-027-0820 | 1.35 ppb |
2015-03-02 | 5701-028-0820 | 0.670 ppb |
2015-03-02 | 5701-029-0820 | 1.41 ppb |
2015-03-02 | 5701-030-0820 | ND |
2015-04-06 | 5701-011-1025 | ND |
2015-04-06 | 5701-023-1014 | ND |
2015-04-20 | 5701-013-1509 | ND |
2015-05-04 | 9590-011-0841 | ND |
2015-05-04 | 9590-023-0846 | ND |
2015-05-18 | 5701-015-1615 | ND |
2015-06-01 | 5701-011-0843 | ND |
2015-06-01 | 5701-023-0847 | ND |
2015-06-02 | 5701-027-0847 | ND |
2015-06-02 | 5701-028-0847 | ND |
2015-06-02 | 5701-029-0847 | ND |
2015-06-02 | 5701-030-0847 | ND |
2015-07-01 | 5701-011-0905 | ND |
2015-07-01 | 5701-023-0857 | ND |
2015-07-22 | 5701-012-1020 | ND |
2015-07-22 | 5701-013-0947 | ND |
2015-07-22 | 5701-016-1631 | ND |
2015-08-04 | 5701-011-1110 | ND |
2015-08-04 | 5701-023-1113 | ND |
2015-08-19 | 5701-015-1102 | ND |
2015-09-08 | 5701-011-0822 | ND |
2015-09-08 | 5701-023-0815 | ND |
2015-09-09 | 5701-027-0753 | 0.580 ppb |
2015-09-09 | 5701-028-0752 | ND |
2015-09-09 | 5701-029-0754 | ND |
2015-09-09 | 5701-030-0754 | ND |
2015-10-05 | 5701-011-0823 | ND |
2015-10-05 | 5701-023-0813 | ND |
2015-10-19 | 5701-008-1318 | ND |
2015-10-19 | 5701-013-1308 | ND |
2015-11-02 | 5701-011-1110 | ND |
2015-11-02 | 5701-023-1113 | ND |
2015-11-16 | 5701-015-1017 | ND |
2015-12-01 | 5701-011-1317 | ND |
2015-12-01 | 5701-023-1321 | ND |
2015-12-09 | 5810-027-1427 | ND |
2015-12-09 | 5810-028-1408 | ND |
2015-12-09 | 5810-029-1319 | ND |
2015-12-09 | 5810-030-1349 | ND |
2016-01-04 | 5701-011-0840 | ND |
2016-01-04 | 5701-023-0844 | ND |
2016-01-21 | 5701-013-1306 | ND |
2016-02-01 | 5701-011-0904 | ND |
2016-02-01 | 5701-023-0910 | ND |
2016-03-02 | 5701-011-1016 | ND |
2016-03-02 | 5701-023-1018 | ND |
2016-03-07 | 5701-027-1452 | 0.620 ppb |
2016-03-07 | 5701-028-1438 | ND |
2016-03-07 | 5701-029-1509 | 0.720 ppb |
2016-03-07 | 5701-030-1525 | 0.510 ppb |
2016-04-04 | 5701-011-0833 | ND |
2016-04-04 | 5701-023-0843 | ND |
2016-04-18 | 5701-013-1258 | ND |
2016-05-02 | 5701-011-0858 | ND |
2016-05-02 | 5701-023-0901 | ND |
2016-06-06 | 5701-011-0829 | ND |
2016-06-06 | 5701-023-0814 | ND |
2016-06-08 | 5701-027-0906 | 0.850 ppb |
2016-06-08 | 5701-028-0906 | 0.570 ppb |
2016-06-08 | 5701-029-0906 | ND |
2016-06-08 | 5701-030-0906 | ND |
2016-06-22 | 5701-015-1333 | ND |
2016-07-05 | 5701-011-1326 | ND |
2016-07-05 | 5701-023-1329 | ND |
2016-07-19 | 5701-013-1606 | ND |
2016-07-20 | 5701-015-1043 | ND |
2016-07-20 | 5701-016-1007 | ND |
2016-08-01 | 5701-011-0931 | ND |
2016-08-01 | 5701-023-0936 | ND |
2016-09-07 | 5701-027-0834 | ND |
2016-09-07 | 5701-028-0834 | 0.710 ppb |
2016-09-07 | 5701-029-0834 | ND |
2016-09-07 | 5701-030-0834 | ND |
2016-09-12 | 5701-011-0904 | ND |
2016-09-12 | 5701-023-0907 | ND |
2016-10-03 | 5701-011-1109 | ND |
2016-10-03 | 5701-023-1100 | ND |
2016-10-19 | 5701-013-1209 | ND |
2016-11-07 | 5701-011-0940 | ND |
2016-11-07 | 5701-023-0943 | ND |
2016-11-15 | 5701-015-1310 | ND |
2016-12-05 | 5701-011-0826 | ND |
2016-12-05 | 5701-023-0829 | ND |
2016-12-05 | 5701-027-1254 | 0.790 ppb |
2016-12-05 | 5701-028-1254 | 0.580 ppb |
2016-12-05 | 5701-029-1254 | 0.750 ppb |
2016-12-05 | 5701-030-1254 | ND |
2017-01-05 | 5701-011-1017 | ND |
2017-01-05 | 5701-023-1023 | ND |
2017-01-19 | 5701-010-0931 | ND |
2017-01-25 | 5701-013-1003 | ND |
2017-02-06 | 5701-011-1002 | ND |
2017-02-06 | 5701-023-1006 | ND |
2017-03-06 | 5701-011-1112 | ND |
2017-03-06 | 5701-023-1115 | ND |
2017-03-08 | 5701-027-0917 | 0.830 ppb |
2017-03-08 | 5701-028-0917 | 0.530 ppb |
2017-03-08 | 5701-029-0917 | ND |
2017-03-08 | 5701-030-0917 | ND |
2017-04-03 | 5701-011-1022 | ND |
2017-04-03 | 5701-023-1026 | ND |
2017-04-13 | 5701-013-1120 | ND |
2017-05-01 | 5701-011-1020 | ND |
2017-05-01 | 5701-023-1022 | ND |
2017-05-25 | 5701-015-1409 | ND |
2017-06-05 | 5701-011-0937 | ND |
2017-06-05 | 5701-023-0940 | ND |
2017-06-05 | 5701-027-0916 | ND |
2017-06-05 | 5701-028-0916 | ND |
2017-06-05 | 5701-029-0916 | ND |
2017-06-05 | 5701-030-0916 | ND |
2017-07-06 | 5701-011-1030 | ND |
2017-07-06 | 5701-023-1034 | ND |
2017-07-18 | 9590-013-1410 | ND |
2017-07-18 | 9590-016-1350 | ND |
2017-08-07 | 5701-011-1051 | ND |
2017-08-07 | 5701-023-1043 | ND |
2017-08-14 | 5701-015-1420 | ND |
2017-09-05 | 5701-027-0835 | 0.680 ppb |
2017-09-05 | 5701-028-0835 | ND |
2017-09-05 | 5701-029-0835 | ND |
2017-09-05 | 5701-030-0835 | ND |
2017-09-11 | 5701-011-0928 | ND |
2017-09-11 | 5701-023-0930 | ND |
2017-10-02 | 5701-011-1018 | ND |
2017-10-02 | 5701-023-1021 | ND |
2017-10-17 | 5701-013-1130 | ND |
2017-11-06 | 5701-011-0907 | ND |
2017-11-06 | 5701-023-0911 | ND |
2017-12-04 | 5701-011-1108 | ND |
2017-12-04 | 5701-023-1112 | ND |
2017-12-06 | 5810-027-1411 | ND |
2017-12-06 | 5810-028-1358 | ND |
2017-12-06 | 5810-029-1504 | ND |
2017-12-06 | 5810-030-1447 | ND |
2018-01-02 | 5701-011-0934 | ND |
2018-01-02 | 5701-023-0934 | ND |
2018-01-21 | 5810-013-0830 | ND |
2018-02-06 | 5701-011-1325 | ND |
2018-02-06 | 5701-023-1328 | ND |
2018-02-14 | 5701-009-1448 | ND |
2018-03-05 | 5701-011-1053 | ND |
2018-03-05 | 5701-023-1103 | ND |
2018-03-07 | 5810-027-1456 | ND |
2018-03-07 | 5810-028-1511 | ND |
2018-03-07 | 5810-029-1439 | ND |
2018-03-07 | 5810-030-1422 | ND |
2018-03-14 | 5701-015-1442 | ND |
2018-04-09 | 5810-011-1019 | ND |
2018-04-09 | 5810-023-1026 | ND |
2018-04-16 | 9590-013-1006 | ND |
2018-05-07 | 5701-011-1116 | ND |
2018-05-07 | 5701-023-1119 | ND |
2018-05-14 | 5701-015-1451 | ND |
2018-06-04 | 5701-027-1425 | 0.650 ppb |
2018-06-04 | 5701-028-1406 | ND |
2018-06-04 | 5701-029-1453 | ND |
2018-06-04 | 5701-030-1442 | ND |
2018-06-05 | 5810-011-1347 | ND |
2018-06-05 | 5810-023-1356 | ND |
2018-07-02 | 5810-011-0927 | ND |
2018-07-02 | 5810-023-0934 | ND |
2018-08-06 | 5701-011-1107 | ND |
2018-08-06 | 5701-013-1321 | ND |
2018-08-06 | 5701-015-0948 | ND |
2018-08-06 | 5701-016-1554 | ND |
2018-08-06 | 5701-023-1114 | ND |
2018-08-08 | 5701-012-1344 | ND |
2018-09-04 | 5701-027-0656 | 0.630 ppb |
2018-09-04 | 5701-028-0656 | ND |
2018-09-04 | 5701-029-0656 | ND |
2018-09-04 | 5701-030-0656 | ND |
2018-09-10 | 5701-011-1010 | ND |
2018-09-10 | 5701-023-1014 | ND |
2018-10-01 | 5701-011-1350 | ND |
2018-10-01 | 5701-023-1357 | ND |
2018-11-05 | 5701-011-0840 | ND |
2018-11-05 | 5701-023-0844 | ND |
2018-11-19 | 5701-008-1515 | ND |
2018-11-19 | 5701-013-1528 | ND |
2018-11-26 | 5810-015-1134 | ND |
2018-12-03 | 5810-011-1010 | ND |
2018-12-03 | 5810-023-1015 | ND |
2018-12-06 | 5701-027-0813 | 0.640 ppb |
2018-12-06 | 5701-028-0813 | 0.640 ppb |
2018-12-06 | 5701-029-0813 | ND |
2018-12-06 | 5701-030-0813 | 0.550 ppb |
2019-01-08 | 5810-011-1358 | ND |
2019-01-08 | 5810-023-1410 | ND |
2019-01-21 | 9590-013-1050 | ND |
2019-02-04 | 5701-011-1358 | ND |
2019-02-04 | 5701-023-1408 | ND |
2019-03-04 | 5810-011-1323 | ND |
2019-03-04 | 5810-023-1315 | ND |
2019-03-04 | 5701-027-1500 | ND |
2019-03-04 | 5701-028-1446 | 0.580 ppb |
2019-03-04 | 5701-029-1545 | ND |
2019-03-04 | 5701-030-1536 | ND |
2019-04-02 | 5701-011-1325 | ND |
2019-04-02 | 5701-023-1335 | ND |
2019-04-11 | 5810-013-1602 | ND |
2019-05-06 | 5810-011-0944 | ND |
2019-05-06 | 5810-023-0948 | ND |
2019-05-16 | 5701-015-0900 | ND |
2019-06-03 | 5701-011-1435 | ND |
2019-06-03 | 5701-023-1439 | ND |
2019-06-04 | 5701-027-0925 | ND |
2019-06-04 | 5701-028-0925 | ND |
2019-06-04 | 5701-029-0925 | ND |
2019-06-04 | 5701-030-0925 | ND |
2019-07-01 | 5701-011-1106 | ND |
2019-07-01 | 5701-023-1110 | ND |
2019-07-16 | 5701-013-1343 | ND |
2019-07-23 | 5701-016-1435 | ND |
2019-08-05 | 5701-011-0922 | ND |
2019-08-05 | 5701-023-0925 | ND |
2019-08-19 | 5701-015-1353 | ND |
2019-09-04 | 5701-011-1357 | ND |
2019-09-04 | 5701-023-1400 | ND |
2019-09-04 | 5701-027-1154 | ND |
2019-09-04 | 5701-028-1142 | ND |
2019-09-04 | 5701-029-1448 | ND |
2019-09-04 | 5701-030-1522 | ND |
2019-10-02 | 5701-011-1609 | ND |
2019-10-02 | 5701-023-1602 | ND |
2019-10-16 | 5701-013-1024 | ND |
2019-11-03 | 5701-011-1055 | ND |
2019-11-03 | 5701-023-1101 | ND |
2019-11-18 | 5701-015-0924 | ND |
2019-12-02 | 5701-011-1100 | ND |
2019-12-02 | 5701-023-1108 | ND |
2019-12-04 | 5701-027-1419 | ND |
2019-12-04 | 5701-028-1355 | ND |
2019-12-04 | 5701-029-1513 | ND |
2019-12-04 | 5701-030-1456 | ND |