Know Your Environment. Protect Your Health.

Chloroform

Meridian Water Department

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.

 

214

Samples

0

Samples exceeding legal limit (MCL)

80

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.315 ppb259ND - 1.20 ppb
20190.427 ppb3213ND - 1.60 ppb
20200.635 ppb2414ND - 1.70 ppb
20210.424 ppb2913ND - 1.30 ppb
20220.420 ppb3415ND - 1.70 ppb
20230.239 ppb7016ND - 1.60 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was based on the California Office of Environmental Health Hazard Assessment's public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer and harm to fetal growth and development.

ppb = parts per billion

All test results

Date Lab ID Result
2018-03-06D201803090744ND
2018-03-06D201803090747ND
2018-03-06D201803090746ND
2018-03-06D201803090745ND
2018-05-23D2018052406880.870 ppb
2018-05-23D2018052406890.540 ppb
2018-05-23D201805240690ND
2018-05-23D2018052406871.10 ppb
2018-07-09D201807111080ND
2018-07-09D2018071110810.850 ppb
2018-07-09D2018071110820.900 ppb
2018-07-09D2018071110790.700 ppb
2018-07-09D201807111078ND
2018-07-09D201807111077ND
2018-07-09D201807111076ND
2018-07-09D201807111074ND
2018-07-09D201807111075ND
2018-11-26D201811270533ND
2018-11-26D201811270532ND
2018-11-26D201811270531ND
2018-11-26D2018112705300.620 ppb
2018-11-26D2018112705291.10 ppb
2018-11-26D2018112705281.20 ppb
2018-11-26201811270591ND
2018-11-26201811270593ND
2019-01-29D2019020103620.930 ppb
2019-01-29D2019020103611.60 ppb
2019-01-29D2019020103601.40 ppb
2019-01-29D201902010365ND
2019-01-29D201902010364ND
2019-01-29D2019020103631.000 ppb
2019-06-03201907080762ND
2019-06-18D201906200380ND
2019-06-18D201906200381ND
2019-06-18D201906200382ND
2019-06-18D201906200383ND
2019-06-18D201906200384ND
2019-06-18D2019062003791.40 ppb
2019-06-182019062003791.40 ppb
2019-06-18201906200380ND
2019-06-18201906200381ND
2019-06-18201906200382ND
2019-06-18201906200383ND
2019-06-18201906200384ND
2019-09-12201909130169ND
2019-09-242019092503591.40 ppb
2019-09-242019092503600.540 ppb
2019-09-242019092503611.30 ppb
2019-09-242019092503620.540 ppb
2019-09-242019092503630.620 ppb
2019-09-24201909250364ND
2019-11-12201911130448ND
2019-11-12201911130449ND
2019-11-122019111304501.000 ppb
2019-11-12201911130451ND
2019-11-122019111304520.530 ppb
2019-11-12201911130453ND
2020-03-03202003040692ND
2020-03-032020030406930.710 ppb
2020-03-032020030406940.880 ppb
2020-03-032020030406951.20 ppb
2020-03-032020030406960.650 ppb
2020-03-03202003040697ND
2020-04-212020042208931.20 ppb
2020-04-21202004220894ND
2020-04-212020042208950.990 ppb
2020-04-212020042208960.940 ppb
2020-04-212020042208970.690 ppb
2020-04-21202004220898ND
2020-07-13202007140428ND
2020-07-132020071404290.680 ppb
2020-07-13202007140430ND
2020-07-29202007300339ND
2020-07-29202007300340ND
2020-07-292020073003411.70 ppb
2020-11-12202011130876ND
2020-11-122020111308771.70 ppb
2020-11-122020111308781.60 ppb
2020-11-122020111308790.990 ppb
2020-11-122020111308801.30 ppb
2020-11-12202011130881ND
2021-01-27202101280244ND
2021-01-27202101280249ND
2021-01-272021012802470.520 ppb
2021-01-27202101280246ND
2021-01-272021012802481.20 ppb
2021-01-27202101280245ND
2021-04-28202104290425ND
2021-04-282021042904230.790 ppb
2021-04-28202104290421ND
2021-04-282021042904221.30 ppb
2021-04-282021042904241.000 ppb
2021-04-28202104290420ND
2021-05-18202105190723ND
2021-07-15202107170079ND
2021-07-21202107220276ND
2021-07-28202107290502ND
2021-07-28202107290506ND
2021-07-28202107290501ND
2021-07-282021072905050.700 ppb
2021-07-282021072905030.610 ppb
2021-07-282021072905041.10 ppb
2021-10-272021102810630.930 ppb
2021-10-27202110281058ND
2021-10-272021102810601.10 ppb
2021-10-272021102810611.000 ppb
2021-10-272021102810591.10 ppb
2021-10-272021102810620.950 ppb
2021-11-16202111170828ND
2021-11-16202111170684ND
2022-02-15202202170046ND
2022-02-15202202160930ND
2022-02-16202202180560ND
2022-02-162022021805611.20 ppb
2022-02-162022021805620.850 ppb
2022-02-162022021805630.520 ppb
2022-02-162022021805640.780 ppb
2022-02-16202202180565ND
2022-02-22202202231265ND
2022-03-01202203030262ND
2022-03-01202203030263ND
2022-03-08202203100069ND
2022-05-10380-1913-2ND
2022-06-30380-7833-1ND
2022-06-30380-7833-2ND
2022-06-30380-7833-30.680 ppb
2022-06-30380-7833-40.540 ppb
2022-06-30380-7833-51.10 ppb
2022-06-30380-7833-6ND
2022-09-20380-21524-1ND
2022-09-20380-21524-2ND
2022-09-20380-21524-30.590 ppb
2022-09-20380-21524-40.710 ppb
2022-09-20380-21524-51.20 ppb
2022-09-20380-21524-60.810 ppb
2022-09-20810-38391-1ND
2022-10-12380-24415-2ND
2022-11-15380-28459-1ND
2022-11-15380-28459-21.70 ppb
2022-11-15380-28459-31.20 ppb
2022-11-15380-28459-4ND
2022-11-15380-28459-51.20 ppb
2022-11-15380-28459-61.20 ppb
2022-11-16380-28732-1ND
2023-01-11380-34262-2ND
2023-01-24380-35453-1ND
2023-01-24380-35453-21.50 ppb
2023-01-24380-35453-31.30 ppb
2023-01-24380-35453-40.580 ppb
2023-01-24380-35453-51.60 ppb
2023-01-24380-35453-6ND
2023-06-05380-49974-4ND
2023-06-05380-49949-1ND
2023-06-05380-49949-2ND
2023-06-05380-49949-31.10 ppb
2023-06-05380-49949-41.10 ppb
2023-06-05380-49949-51.20 ppb
2023-06-05380-49949-6ND
2023-08-01380-57235-1ND
2023-08-02380-57434-1ND
2023-08-02380-57434-5ND
2023-08-02380-57496-1ND
2023-08-02380-57496-2ND
2023-08-02380-57460-1ND
2023-08-02380-57460-2ND
2023-08-02380-57439-1ND
2023-08-02380-57439-5ND
2023-08-02380-57464-1ND
2023-08-02380-57431-1AAND
2023-08-02380-57431-2AAND
2023-08-07380-57977-1ND
2023-08-07380-57977-2ND
2023-08-07380-57957-10.570 ppb
2023-08-07380-57957-2ND
2023-08-07380-57974-1ND
2023-08-07380-57974-2ND
2023-08-07380-57897-1ND
2023-08-07380-57894-1ND
2023-08-07380-57899-1ND
2023-08-09380-58461-1ND
2023-08-09380-58496-1ND
2023-08-10380-58742-1ND
2023-08-10380-58742-2ND
2023-08-10380-58749-1ND
2023-08-10380-58749-2ND
2023-08-10380-58702-1ND
2023-08-10380-58702-2ND
2023-09-05380-61807-1ND
2023-09-05380-61807-20.910 ppb
2023-09-05380-61807-30.810 ppb
2023-09-05380-61807-41.30 ppb
2023-09-05380-61807-51.10 ppb
2023-09-05380-61807-6ND
2023-09-05380-61825-3ND
2023-09-23380-64644-1ND
2023-09-23380-64644-1AND
2023-09-26380-64488-1ND
2023-09-26380-64488-2ND
2023-09-26380-64427-1ND
2023-09-26380-64427-2ND
2023-10-03380-65599-4ND
2023-10-04380-65926-1ND
2023-10-04380-65926-20.880 ppb
2023-10-04380-65926-30.810 ppb
2023-10-04380-65926-40.850 ppb
2023-10-04380-65926-51.10 ppb
2023-10-04380-65926-6ND
2023-11-14380-71156-1ND
2023-11-14380-71156-2ND
2023-11-14380-71138-1ND
2023-11-20380-72055-1ND
2023-11-20380-72055-2ND
2023-11-20380-72055-3ND
2023-11-20380-72055-4ND