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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Rowland 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

 

184

Samples

0

Samples exceeding legal limit (MCL)

152

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
201410.5 ppb3229ND - 22.0 ppb
20159.40 ppb3222ND - 24.8 ppb
201611.1 ppb3231ND - 22.5 ppb
201718.0 ppb24241.20 ppb - 33.1 ppb
20184.06 ppb3224ND - 10.5 ppb
20193.15 ppb3222ND - 9.90 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
2014-03-103761-800-082511.4 ppb
2014-03-103761-801-08405.20 ppb
2014-03-103761-802-0925ND
2014-03-103761-803-0940ND
2014-03-103761-804-10008.40 ppb
2014-03-103761-805-08201.20 ppb
2014-03-103761-806-11108.20 ppb
2014-03-103761-807-1110ND
2014-06-093761-800-080011.7 ppb
2014-06-093761-801-11008.30 ppb
2014-06-093761-802-085016.3 ppb
2014-06-093761-803-091013.4 ppb
2014-06-093761-804-093011.7 ppb
2014-06-093761-805-080017.4 ppb
2014-06-093761-806-110011.3 ppb
2014-06-093761-807-104013.2 ppb
2014-09-083761-800-105017.4 ppb
2014-09-083761-801-103015.5 ppb
2014-09-083761-802-075021.2 ppb
2014-09-083761-803-081018.2 ppb
2014-09-083761-804-083016.9 ppb
2014-09-083761-805-083022.0 ppb
2014-09-083761-806-113015.0 ppb
2014-09-083761-807-100018.3 ppb
2014-12-083761-800-07505.50 ppb
2014-12-083761-801-11004.30 ppb
2014-12-083761-802-08507.50 ppb
2014-12-083761-803-09057.10 ppb
2014-12-083761-804-09209.50 ppb
2014-12-083761-805-08457.30 ppb
2014-12-083761-806-10005.80 ppb
2014-12-083761-807-10507.20 ppb
2015-03-023761-800-0750ND
2015-03-023761-801-0800ND
2015-03-023761-802-0840ND
2015-03-023761-803-0850ND
2015-03-023761-804-09208.10 ppb
2015-03-023761-805-09552.30 ppb
2015-03-023761-806-11208.40 ppb
2015-03-023761-807-1150ND
2015-06-083761-800-080010.4 ppb
2015-06-083761-801-081511.0 ppb
2015-06-083761-802-084512.5 ppb
2015-06-083761-803-090011.4 ppb
2015-06-083761-804-100016.1 ppb
2015-06-083761-805-093016.8 ppb
2015-06-083761-806-11008.90 ppb
2015-06-083761-807-114011.1 ppb
2015-09-143761-800-074524.8 ppb
2015-09-143761-801-075522.5 ppb
2015-09-143761-802-082021.9 ppb
2015-09-143761-803-084017.5 ppb
2015-09-143761-804-093013.3 ppb
2015-09-143761-805-090519.0 ppb
2015-09-143761-806-104021.2 ppb
2015-09-143761-807-111518.6 ppb
2015-12-143761-800-0805ND
2015-12-143761-801-0815ND
2015-12-143761-802-0845ND
2015-12-143761-803-0905ND
2015-12-143761-804-10207.50 ppb
2015-12-143761-805-09558.20 ppb
2015-12-143761-806-11209.30 ppb
2015-12-143761-807-1205ND
2016-03-143761-800-08001.10 ppb
2016-03-143761-801-0815ND
2016-03-143761-802-08451.10 ppb
2016-03-143761-803-09001.000 ppb
2016-03-143761-804-10059.80 ppb
2016-03-143761-805-09457.00 ppb
2016-03-143761-806-11205.20 ppb
2016-03-143761-807-12151.40 ppb
2016-06-133761-800-080013.8 ppb
2016-06-133761-801-081012.2 ppb
2016-06-133761-802-084513.2 ppb
2016-06-133761-803-090013.1 ppb
2016-06-133761-804-100512.2 ppb
2016-06-133761-805-093511.3 ppb
2016-06-133761-806-110513.5 ppb
2016-06-133761-807-114013.7 ppb
2016-09-123761-800-080518.0 ppb
2016-09-123761-801-082020.4 ppb
2016-09-123761-802-084521.4 ppb
2016-09-123761-803-074522.5 ppb
2016-09-123761-804-090018.8 ppb
2016-09-123761-805-093021.8 ppb
2016-09-123761-806-103517.4 ppb
2016-09-123761-807-113019.2 ppb
2016-12-123761-800-08008.30 ppb
2016-12-123761-801-08109.30 ppb
2016-12-123761-802-08308.40 ppb
2016-12-123761-803-08508.30 ppb
2016-12-123761-804-09356.00 ppb
2016-12-123761-805-09157.50 ppb
2016-12-123761-806-11008.70 ppb
2016-12-123761-807-11408.10 ppb
2017-03-133761-800-081528.0 ppb
2017-03-133761-801-083027.0 ppb
2017-03-133761-802-090029.6 ppb
2017-03-133761-803-092533.1 ppb
2017-03-133761-804-101532.3 ppb
2017-03-133761-805-095530.4 ppb
2017-03-133761-806-111531.3 ppb
2017-03-133761-807-114531.3 ppb
2017-09-113761-800-080019.1 ppb
2017-09-113761-801-081520.2 ppb
2017-09-113761-802-084018.7 ppb
2017-09-113761-803-085524.5 ppb
2017-09-113761-804-095026.7 ppb
2017-09-113761-805-092026.4 ppb
2017-09-113761-806-110019.0 ppb
2017-09-113761-807-114520.2 ppb
2017-12-113761-800-08001.30 ppb
2017-12-113761-801-08101.30 ppb
2017-12-113761-802-08301.20 ppb
2017-12-113761-803-08451.20 ppb
2017-12-113761-804-09002.20 ppb
2017-12-113761-805-09404.60 ppb
2017-12-113761-806-10402.10 ppb
2017-12-113761-807-11251.30 ppb
2018-03-123761-800-08001.000 ppb
2018-03-123761-801-0810ND
2018-03-123761-802-08351.40 ppb
2018-03-123761-803-08501.20 ppb
2018-03-123761-804-09456.60 ppb
2018-03-123761-805-09205.30 ppb
2018-03-123761-806-10455.60 ppb
2018-03-123761-807-11352.40 ppb
2018-06-113761-800-08001.60 ppb
2018-06-113761-801-08101.70 ppb
2018-06-113761-802-08301.60 ppb
2018-06-113761-803-08401.70 ppb
2018-06-113761-804-09407.10 ppb
2018-06-113761-805-09102.80 ppb
2018-06-113761-806-10358.70 ppb
2018-06-113761-807-11205.10 ppb
2018-09-103761-800-080010.1 ppb
2018-09-103761-801-08159.10 ppb
2018-09-103761-802-08409.10 ppb
2018-09-103761-803-08558.80 ppb
2018-09-103761-804-09455.00 ppb
2018-09-103761-805-092010.5 ppb
2018-09-103761-806-105010.00 ppb
2018-09-103761-807-11309.60 ppb
2018-12-103761-800-0800ND
2018-12-103761-801-0810ND
2018-12-103761-802-0900ND
2018-12-103761-803-0935ND
2018-12-103761-804-1015ND
2018-12-103761-805-0920ND
2018-12-103761-806-11204.00 ppb
2018-12-103761-807-1150ND
2019-03-113761-800-0810ND
2019-03-113761-801-0825ND
2019-03-113761-802-0850ND
2019-03-113761-803-0900ND
2019-03-113761-804-09509.90 ppb
2019-03-113761-805-09255.70 ppb
2019-03-113761-806-10505.60 ppb
2019-03-113761-807-1130ND
2019-06-103761-800-07501.000 ppb
2019-06-103761-801-0800ND
2019-06-103761-802-08301.20 ppb
2019-06-103761-803-08501.10 ppb
2019-06-103761-804-09457.40 ppb
2019-06-103761-805-09201.60 ppb
2019-06-103761-806-11059.40 ppb
2019-06-103761-807-11501.30 ppb
2019-09-093761-800-08265.90 ppb
2019-09-093761-801-08406.50 ppb
2019-09-093761-802-09107.20 ppb
2019-09-093761-803-09255.80 ppb
2019-09-093761-804-10254.80 ppb
2019-09-093761-805-10005.10 ppb
2019-09-093761-806-12057.10 ppb
2019-09-093761-807-12456.20 ppb
2019-12-093761-800-08351.10 ppb
2019-12-093761-801-0855ND
2019-12-093761-802-0925ND
2019-12-093761-803-1000ND
2019-12-093761-804-11052.80 ppb
2019-12-093761-805-10301.90 ppb
2019-12-093761-806-12202.10 ppb
2019-12-093761-807-1255ND