Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Chloroform

Carmichael Water District

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

 

172

Samples

0

Samples exceeding legal limit (MCL)

90

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20144.69 ppb2611ND - 30.0 ppb
20156.35 ppb3318ND - 29.0 ppb
20168.19 ppb3319ND - 32.0 ppb
20176.31 ppb2311ND - 32.0 ppb
20189.16 ppb3115ND - 37.0 ppb
20199.35 ppb2616ND - 30.0 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
2014-01-035810-901-113712.0 ppb
2014-01-035810-902-11206.90 ppb
2014-01-035810-903-10585.40 ppb
2014-01-035810-904-10396.20 ppb
2014-02-205810-022-0953ND
2014-02-205810-023-09328.90 ppb
2014-03-065810-006-1017ND
2014-04-025810-901-125830.0 ppb
2014-04-025810-902-124320.0 ppb
2014-04-025810-903-122413.0 ppb
2014-04-025810-904-120814.0 ppb
2014-06-055810-006-0856ND
2014-06-055810-009-0916ND
2014-06-115810-016-0918ND
2014-07-025810-901-1253ND
2014-07-025810-902-12344.20 ppb
2014-07-025810-903-1215ND
2014-07-025810-904-11551.40 ppb
2014-08-205810-016-0840ND
2014-09-045810-006-0940ND
2014-09-045810-009-0921ND
2014-09-045810-016-1015ND
2014-09-045810-021-0900ND
2014-12-045810-006-0910ND
2014-12-045810-009-0955ND
2014-12-045810-021-1029ND
2015-01-075810-901-121729.0 ppb
2015-01-075810-902-120018.0 ppb
2015-01-075810-903-114013.0 ppb
2015-01-075810-904-111217.0 ppb
2015-03-055810-006-0956ND
2015-03-055810-009-0935ND
2015-03-055810-021-1033ND
2015-03-125810-022-0916ND
2015-03-125810-023-08357.20 ppb
2015-04-015810-901-124424.0 ppb
2015-04-015810-902-122813.0 ppb
2015-04-015810-903-12069.90 ppb
2015-04-015810-904-114513.0 ppb
2015-06-045810-006-1039ND
2015-06-045810-009-1108ND
2015-06-045810-016-09541.10 ppb
2015-06-045810-020-09211.60 ppb
2015-06-045810-021-1146ND
2015-07-025810-901-11311.40 ppb
2015-07-025810-902-1114ND
2015-07-025810-903-10598.60 ppb
2015-07-025810-904-10421.20 ppb
2015-09-035810-006-1020ND
2015-09-035810-009-0959ND
2015-09-035810-016-0901ND
2015-09-035810-021-0938ND
2015-10-085810-901-142022.0 ppb
2015-10-085810-902-140716.0 ppb
2015-10-085810-903-135111.0 ppb
2015-10-085810-904-13362.60 ppb
2015-12-035810-006-0948ND
2015-12-035810-009-1031ND
2015-12-035810-021-0910ND
2016-01-135810-901-140926.0 ppb
2016-01-135810-902-135613.0 ppb
2016-01-135810-903-13398.90 ppb
2016-01-135810-904-131817.0 ppb
2016-03-035810-006-1036ND
2016-03-035810-009-1104ND
2016-03-035810-016-09481.000 ppb
2016-03-035810-020-09031.60 ppb
2016-03-035810-021-1140ND
2016-03-105810-022-0905ND
2016-03-105810-023-092015.0 ppb
2016-04-065810-901-115728.0 ppb
2016-04-065810-902-113815.0 ppb
2016-04-065810-903-111612.0 ppb
2016-04-065810-904-105916.0 ppb
2016-06-025810-006-1015ND
2016-06-025810-009-0930ND
2016-06-025810-021-0905ND
2016-07-075810-901-123032.0 ppb
2016-07-075810-902-120721.0 ppb
2016-07-075810-903-114415.0 ppb
2016-07-075810-904-1123ND
2016-09-015810-006-0851ND
2016-09-015810-009-0912ND
2016-09-015810-020-10181.40 ppb
2016-09-015810-021-0933ND
2016-10-075810-901-094219.0 ppb
2016-10-075810-902-092811.0 ppb
2016-10-075810-903-09108.00 ppb
2016-10-075810-904-08549.30 ppb
2016-12-015810-006-0929ND
2016-12-015810-009-0901ND
2016-12-015810-021-0959ND
2017-03-025810-006-0910ND
2017-03-025810-009-0944ND
2017-03-025810-016-1125ND
2017-03-025810-020-10521.40 ppb
2017-03-025810-021-1005ND
2017-03-215810-022-1100ND
2017-03-215810-023-10408.70 ppb
2017-06-015810-016-1220ND
2017-06-015810-020-11301.30 ppb
2017-06-015810-021-0947ND
2017-06-075810-006-0920ND
2017-06-075810-009-0910ND
2017-07-075810-901-104032.0 ppb
2017-07-075810-902-102318.0 ppb
2017-07-075810-903-110014.0 ppb
2017-07-075810-904-11211.20 ppb
2017-09-075810-006-0849ND
2017-09-075810-009-0905ND
2017-09-075810-021-0927ND
2017-10-045810-901-124729.0 ppb
2017-10-045810-902-122216.0 ppb
2017-10-045810-903-133316.0 ppb
2017-10-045810-904-14347.60 ppb
2018-01-189590-901-112036.0 ppb
2018-01-189590-902-115820.0 ppb
2018-01-189590-903-121910.00 ppb
2018-01-189590-904-123325.0 ppb
2018-03-019590-006-0945ND
2018-03-019590-009-0918ND
2018-03-019590-021-1039ND
2018-04-045810-901-124637.0 ppb
2018-04-045810-902-121426.0 ppb
2018-04-045810-903-135021.0 ppb
2018-04-045810-904-15033.60 ppb
2018-04-185810-022-1233ND
2018-06-075810-006-0928ND
2018-06-075810-009-0906ND
2018-06-075810-016-1110ND
2018-06-075810-020-1040ND
2018-06-075810-021-0845ND
2018-07-065810-901-103226.0 ppb
2018-07-065810-902-101715.0 ppb
2018-07-065810-903-105211.0 ppb
2018-07-065810-904-1109ND
2018-09-065810-006-0916ND
2018-09-065810-009-0940ND
2018-09-065810-021-1007ND
2018-10-245810-901-125926.0 ppb
2018-10-245810-902-124016.0 ppb
2018-10-245810-903-121710.00 ppb
2018-10-245810-904-11581.30 ppb
2018-12-065810-006-0915ND
2018-12-065810-009-0852ND
2018-12-065810-021-0942ND
2019-01-165810-901-131023.0 ppb
2019-01-165810-902-124211.0 ppb
2019-01-165810-903-12208.50 ppb
2019-01-165810-904-115113.0 ppb
2019-03-075810-006-0928ND
2019-03-075810-009-0850ND
2019-03-075810-021-1010ND
2019-03-145810-022-0850ND
2019-04-095810-901-101830.0 ppb
2019-04-095810-902-095616.0 ppb
2019-04-095810-903-093611.0 ppb
2019-04-095810-904-091818.0 ppb
2019-06-065810-006-0934ND
2019-06-065810-009-0909ND
2019-06-065810-021-0845ND
2019-07-105810-901-104226.0 ppb
2019-07-105810-902-094715.0 ppb
2019-07-105810-903-114712.0 ppb
2019-07-105810-904-13301.10 ppb
2019-09-055810-006-0940ND
2019-09-055810-009-0926ND
2019-09-055810-021-0908ND
2019-10-035810-901-120629.0 ppb
2019-10-035810-902-122216.0 ppb
2019-10-035810-903-125112.0 ppb
2019-10-035810-904-13141.60 ppb