Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Chloroform

City of Clovis

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

 

303

Samples

0

Samples exceeding legal limit (MCL)

186

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201410.4 ppb5433ND - 34.0 ppb
201517.1 ppb4132ND - 36.0 ppb
20169.12 ppb6121ND - 75.0 ppb
201720.6 ppb4634ND - 65.0 ppb
201831.0 ppb4034ND - 75.0 ppb
201915.5 ppb6132ND - 63.0 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
2014-03-075810-046-0927ND
2014-03-105810-900-094321.0 ppb
2014-03-105810-901-095723.0 ppb
2014-03-105810-902-090515.0 ppb
2014-03-105810-903-092820.0 ppb
2014-03-105810-904-091817.0 ppb
2014-03-105810-905-082734.0 ppb
2014-03-105810-906-084125.0 ppb
2014-03-105810-907-085117.0 ppb
2014-03-135810-020-10251.10 ppb
2014-03-285810-033-1306ND
2014-03-315810-034-1017ND
2014-06-055810-046-0932ND
2014-06-095810-900-093710.00 ppb
2014-06-095810-901-095010.00 ppb
2014-06-095810-902-09038.10 ppb
2014-06-095810-903-092523.0 ppb
2014-06-095810-904-09158.60 ppb
2014-06-095810-905-083810.00 ppb
2014-06-095810-906-08537.80 ppb
2014-06-095810-907-08063.80 ppb
2014-06-125810-020-1051ND
2014-06-125810-026-1039ND
2014-06-125810-052-1010ND
2014-06-125810-082-0806ND
2014-06-135810-054-1057ND
2014-06-165810-034-0924ND
2014-06-185810-033-0845ND
2014-09-085810-033-0840ND
2014-09-085810-034-0930ND
2014-09-105810-900-103917.0 ppb
2014-09-105810-901-105219.0 ppb
2014-09-105810-902-100716.0 ppb
2014-09-105810-903-102723.0 ppb
2014-09-105810-904-101822.0 ppb
2014-09-105810-905-092931.0 ppb
2014-09-105810-906-094219.0 ppb
2014-09-105810-907-095131.0 ppb
2014-09-175810-046-0834ND
2014-09-185810-026-0954ND
2014-09-235810-020-1106ND
2014-12-035810-033-0945ND
2014-12-035810-034-0910ND
2014-12-055810-020-1011ND
2014-12-055810-046-0822ND
2014-12-085810-026-1000ND
2014-12-105810-900-093718.0 ppb
2014-12-105810-901-094818.0 ppb
2014-12-105810-902-085918.0 ppb
2014-12-105810-903-092121.0 ppb
2014-12-105810-904-091018.0 ppb
2014-12-105810-905-08351.20 ppb
2014-12-105810-906-084912.0 ppb
2014-12-105810-907-101023.0 ppb
2015-03-055810-020-0830ND
2015-03-055810-032-1115ND
2015-03-115810-034-0930ND
2015-03-115810-900-085427.0 ppb
2015-03-115810-901-082928.0 ppb
2015-03-115810-902-103320.0 ppb
2015-03-115810-903-105636.0 ppb
2015-03-115810-904-104528.0 ppb
2015-03-115810-905-095834.0 ppb
2015-03-115810-906-101213.0 ppb
2015-03-115810-907-102415.0 ppb
2015-06-095810-034-0900ND
2015-06-105810-900-091433.0 ppb
2015-06-105810-901-092631.0 ppb
2015-06-105810-902-084111.0 ppb
2015-06-105810-903-090234.0 ppb
2015-06-105810-904-085317.0 ppb
2015-06-105810-905-080733.0 ppb
2015-06-105810-906-08288.30 ppb
2015-06-105810-907-07514.30 ppb
2015-06-155810-020-1105ND
2015-09-095810-034-0822ND
2015-09-095810-900-090220.0 ppb
2015-09-095810-901-091420.0 ppb
2015-09-095810-902-08309.50 ppb
2015-09-095810-903-085111.0 ppb
2015-09-095810-904-084113.0 ppb
2015-09-095810-905-080129.0 ppb
2015-09-095810-906-081928.0 ppb
2015-09-095810-907-074423.0 ppb
2015-09-115810-020-0955ND
2015-12-025810-034-1104ND
2015-12-045810-020-1143ND
2015-12-095810-900-094123.0 ppb
2015-12-095810-901-095322.0 ppb
2015-12-095810-902-082318.0 ppb
2015-12-095810-903-084925.0 ppb
2015-12-095810-904-083922.0 ppb
2015-12-095810-905-075831.0 ppb
2015-12-095810-906-081223.0 ppb
2015-12-095810-907-101010.00 ppb
2016-03-025810-034-1010ND
2016-03-035810-024-1152ND
2016-03-035810-048-1221ND
2016-03-035810-077-1141ND
2016-03-045810-020-1224ND
2016-03-045810-049-1253ND
2016-03-095810-005-0837ND
2016-03-095810-019-0856ND
2016-03-165810-900-0955ND
2016-03-165810-901-1006ND
2016-03-165810-902-0908ND
2016-03-165810-903-0846ND
2016-03-165810-904-0920ND
2016-03-165810-905-0928ND
2016-03-165810-906-0854ND
2016-03-165810-907-081818.0 ppb
2016-03-185810-025-1018ND
2016-06-065810-018-0836ND
2016-06-085810-034-0910ND
2016-06-135810-900-094127.0 ppb
2016-06-135810-901-100731.0 ppb
2016-06-135810-902-090026.0 ppb
2016-06-135810-903-094875.0 ppb
2016-06-135810-904-093547.0 ppb
2016-06-135810-905-090054.0 ppb
2016-06-135810-906-094028.0 ppb
2016-06-135810-907-091937.0 ppb
2016-06-225810-020-07381.60 ppb
2016-09-085810-014-0800ND
2016-09-085810-040-0900ND
2016-09-085810-068-0928ND
2016-09-095810-012-0950ND
2016-09-095810-031-0847ND
2016-09-095810-034-0753ND
2016-09-095810-035-1038ND
2016-09-095810-076-0925ND
2016-09-125810-036-0859ND
2016-09-125810-050-0955ND
2016-09-125810-074-1103ND
2016-09-145810-016-0923ND
2016-09-145810-020-08051.30 ppb
2016-09-145810-900-100821.0 ppb
2016-09-145810-901-080822.0 ppb
2016-09-145810-902-093118.0 ppb
2016-09-145810-903-084937.0 ppb
2016-09-145810-904-094417.0 ppb
2016-09-145810-905-095322.0 ppb
2016-09-145810-906-092027.0 ppb
2016-09-145810-907-090744.0 ppb
2016-09-215810-072-1100ND
2016-12-025810-070-0740ND
2016-12-075810-020-0815ND
2016-12-075810-034-10351.000 ppb
2016-12-125810-900-09001.40 ppb
2016-12-125810-901-0840ND
2016-12-125810-902-0930ND
2016-12-125810-903-0846ND
2016-12-125810-904-0911ND
2016-12-125810-905-0947ND
2016-12-125810-906-0915ND
2016-12-125810-907-0854ND
2017-03-155810-900-094353.0 ppb
2017-03-155810-901-100056.0 ppb
2017-03-155810-902-085740.0 ppb
2017-03-155810-903-092853.0 ppb
2017-03-155810-904-091451.0 ppb
2017-03-155810-905-080565.0 ppb
2017-03-155810-906-082855.0 ppb
2017-03-155810-907-08422.20 ppb
2017-03-165810-020-0850ND
2017-03-165810-034-0838ND
2017-06-055810-054-1023ND
2017-06-065810-020-0708ND
2017-06-065810-052-0815ND
2017-06-065810-082-0755ND
2017-06-075810-034-0800ND
2017-06-125810-900-102927.0 ppb
2017-06-125810-901-104931.0 ppb
2017-06-125810-902-092319.0 ppb
2017-06-125810-903-100534.0 ppb
2017-06-125810-904-094621.0 ppb
2017-06-125810-905-081634.0 ppb
2017-06-125810-906-084126.0 ppb
2017-06-125810-907-090336.0 ppb
2017-09-115810-900-085917.0 ppb
2017-09-115810-901-091618.0 ppb
2017-09-115810-902-080410.00 ppb
2017-09-115810-903-084017.0 ppb
2017-09-115810-904-082316.0 ppb
2017-09-115810-905-071126.0 ppb
2017-09-115810-906-073112.0 ppb
2017-09-115810-907-074944.0 ppb
2017-09-125810-020-0642ND
2017-09-125810-033-0745ND
2017-09-125810-034-08101.000 ppb
2017-10-095810-026-0905ND
2017-10-095810-046-0945ND
2017-11-275810-900-124617.0 ppb
2017-11-275810-901-130422.0 ppb
2017-11-275810-902-115415.0 ppb
2017-11-275810-903-122817.0 ppb
2017-11-275810-904-121418.0 ppb
2017-11-275810-905-111532.0 ppb
2017-11-275810-906-112419.0 ppb
2017-11-275810-907-105640.0 ppb
2017-12-125810-020-0857ND
2017-12-125810-034-10501.10 ppb
2018-03-085810-032-0755ND
2018-03-145810-900-101334.0 ppb
2018-03-145810-901-102938.0 ppb
2018-03-145810-902-092126.0 ppb
2018-03-145810-903-095541.0 ppb
2018-03-145810-904-094129.0 ppb
2018-03-145810-905-084342.0 ppb
2018-03-145810-906-090049.0 ppb
2018-03-145810-907-081429.0 ppb
2018-03-165810-034-11451.10 ppb
2018-03-205810-020-10106.50 ppb
2018-06-055810-034-1025ND
2018-06-065810-020-1015ND
2018-06-135810-900-083639.0 ppb
2018-06-135810-901-085433.0 ppb
2018-06-135810-902-074425.0 ppb
2018-06-135810-903-081733.0 ppb
2018-06-135810-904-080424.0 ppb
2018-06-135810-905-070951.0 ppb
2018-06-135810-906-072657.0 ppb
2018-06-135810-907-064860.0 ppb
2018-09-075810-034-0740ND
2018-09-115810-900-083122.0 ppb
2018-09-115810-901-084624.0 ppb
2018-09-115810-902-074315.0 ppb
2018-09-115810-903-081226.0 ppb
2018-09-115810-904-080017.0 ppb
2018-09-115810-905-071129.0 ppb
2018-09-115810-906-072724.0 ppb
2018-09-115810-907-065252.0 ppb
2018-10-175810-020-0815ND
2018-10-175810-034-0940ND
2018-10-245810-900-092164.0 ppb
2018-10-245810-901-093657.0 ppb
2018-10-245810-902-083731.0 ppb
2018-10-245810-903-090642.0 ppb
2018-10-245810-904-085531.0 ppb
2018-10-245810-905-080258.0 ppb
2018-10-245810-906-082155.0 ppb
2018-10-245810-907-074275.0 ppb
2019-01-025810-024-0735ND
2019-01-095810-034-1025ND
2019-01-095810-049-1220ND
2019-01-105810-005-1015ND
2019-01-105810-019-0730ND
2019-01-105810-020-0947ND
2019-01-105810-025-0940ND
2019-01-105810-048-0830ND
2019-01-115810-077-1000ND
2019-03-135810-900-100048.0 ppb
2019-03-135810-901-101853.0 ppb
2019-03-135810-902-091343.0 ppb
2019-03-135810-903-094153.0 ppb
2019-03-135810-904-093045.0 ppb
2019-03-135810-905-0839ND
2019-03-135810-906-085743.0 ppb
2019-03-135810-907-082018.0 ppb
2019-04-055810-034-0910ND
2019-04-085810-020-0905ND
2019-04-105810-018-1050ND
2019-06-055810-900-083838.0 ppb
2019-06-055810-901-085544.0 ppb
2019-06-055810-902-074629.0 ppb
2019-06-055810-903-082039.0 ppb
2019-06-055810-904-080631.0 ppb
2019-06-055810-905-07079.20 ppb
2019-06-055810-906-072741.0 ppb
2019-06-055810-907-064463.0 ppb
2019-07-035810-040-1005ND
2019-07-055810-014-0814ND
2019-07-055810-035-0733ND
2019-07-055810-050-0653ND
2019-07-055810-074-0715ND
2019-07-095810-016-0951ND
2019-07-095810-076-0700ND
2019-07-105810-012-0724ND
2019-07-105810-031-0655ND
2019-07-165810-068-0830ND
2019-07-175810-034-0935ND
2019-07-185810-036-0820ND
2019-07-185810-072-0945ND
2019-07-265810-020-0832ND
2019-09-115810-900-082720.0 ppb
2019-09-115810-901-102019.0 ppb
2019-09-115810-902-074015.0 ppb
2019-09-115810-903-081214.0 ppb
2019-09-115810-904-075918.0 ppb
2019-09-115810-905-070633.0 ppb
2019-09-115810-906-072431.0 ppb
2019-09-115810-907-064645.0 ppb
2019-10-115810-070-0818ND
2019-10-185810-900-092014.0 ppb
2019-10-185810-901-094211.0 ppb
2019-10-185810-902-083111.0 ppb
2019-10-185810-903-090317.0 ppb
2019-10-185810-904-085111.0 ppb
2019-10-185810-905-075619.0 ppb
2019-10-185810-906-081527.0 ppb
2019-10-185810-907-073439.0 ppb
2019-10-215810-020-1146ND
2019-10-215810-034-11051.30 ppb