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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Cal-water Service Company - Chico

Chloromethane is an industrial solvent, aerosol propellant and a refrigerant. It also forms as a byproduct of water disinfection. The EPA classifies chloromethane as possibly carcinogenic to humans.

MORE ABOUT THIS CONTAMINANT

 

229

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND230ND
2014ND550ND
2015ND260ND
2016ND130ND
2017ND280ND
2018ND390ND
2019ND450ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 2.69 ppb

The EWG Health Guideline of 2.69 ppb for chloromethane was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against cancer.

ppb = parts per billion

All test results

Date Lab ID Result
2013-07-08201307090268AMND
2013-07-10201307110723AMND
2013-07-10201307110714AMND
2013-07-23201307240454AMND
2013-07-24201307250299AMND
2013-08-05201308060209AMND
2013-08-05201308060174AMND
2013-08-07201308080297AMND
2013-08-14201308150419AMND
2013-08-14201308150376AMND
2013-08-14201308150519AMND
2013-08-20201308210545AMND
2013-08-20201308210531AMND
2013-08-21201308220191AMND
2013-08-21201308220228AMND
2013-09-17201309180770AMND
2013-09-17201309180760AMND
2013-09-18201309200057AMND
2013-09-18201309200197AMND
2013-10-08201310090466AMND
2013-10-08201310090663AMND
2013-10-08201310090475AMND
2013-10-15201310160276AMND
2014-01-07201401080521AMND
2014-01-07201401080502AMND
2014-01-08201401090455AMND
2014-01-14201401150423AMND
2014-01-21201401220301AMND
2014-01-22201401230438AMND
2014-01-28201401290592AMND
2014-02-11201402120765AMND
2014-02-11201402120783AMND
2014-02-11201402120774AMND
2014-02-12201402130422AMND
2014-02-12201402130413AMND
2014-02-12201402130403AMND
2014-02-19201402200383AMND
2014-02-26201402270253AMND
2014-02-26201402270202AMND
2014-02-28201403010102AMND
2014-03-04201403050602AMND
2014-03-04201403050448AMND
2014-03-04201403050469AMND
2014-03-05201403060269AMND
2014-03-17201403180359AMND
2014-03-17201403180308AMND
2014-03-18201403190842AMND
2014-03-18201403190857AMND
2014-04-08201404090691AMND
2014-04-09201404100733AMND
2014-04-09201404100816AMND
2014-04-09201404100717AMND
2014-04-09201404100762AMND
2014-04-22201404230616AMND
2014-04-22201404230451AMND
2014-04-23201404240395AMND
2014-04-23201404240503AMND
2014-05-275810-068-1008ND
2014-06-115810-068-0846ND
2014-06-18201406190418AMND
2014-07-09201407100538AMND
2014-07-14201407150436AMND
2014-08-05201408060371AMND
2014-08-05201408060337AMND
2014-08-06201408070479AMND
2014-08-125810-068-0630ND
2014-08-275810-068-1130ND
2014-09-09201409110339AMND
2014-09-09201409110319AMND
2014-09-105810-068-0921ND
2014-09-23201409240606AMND
2014-09-24201409250613AMND
2014-10-075810-068-0927ND
2014-10-08201410090312AMND
2014-10-15201410160402AMND
2014-10-27201410290061AMND
2014-11-045810-068-1018ND
2014-12-09201412100746AMND
2015-01-13201501140878AMND
2015-02-055810-068-0630ND
2015-02-239590-068-0635ND
2015-03-045810-068-1033ND
2015-04-289590-068-1355ND
2015-05-069590-046-0757ND
2015-05-069590-071-0827ND
2015-05-119590-068-1318ND
2015-05-129590-007-0815ND
2015-05-139590-017-0950ND
2015-05-139590-139-1026ND
2015-06-109590-068-1318ND
2015-07-145810-052-0700ND
2015-07-239590-068-1009ND
2015-08-069590-068-1008ND
2015-09-239590-068-0955ND
2015-09-299590-052-1315ND
2015-10-079590-068-0855ND
2015-10-219590-136-0950ND
2015-10-219590-143-0756ND
2015-10-299590-029-1047ND
2015-11-169590-068-1309ND
2015-12-019590-036-1310ND
2015-12-019590-037-1027ND
2015-12-019590-052-0900ND
2015-12-089590-068-0918ND
2016-01-129590-068-0918ND
2016-02-039590-068-1152ND
2016-03-039590-068-1200ND
2016-04-079590-068-0940ND
2016-04-269590-068-1400ND
2016-05-039590-068-0818ND
2016-07-069590-068-1300ND
2016-08-039590-068-1010ND
2016-10-059590-068-0810ND
2016-11-079590-068-1100ND
2016-12-085810-071-0547ND
2016-12-165810-019-1520ND
2016-12-195810-018-0832ND
2017-01-119590-068-1326ND
2017-01-195810-065-1239ND
2017-02-039590-068-1350ND
2017-02-079590-007-0824ND
2017-02-079590-017-1059ND
2017-03-065810-071-0850ND
2017-03-075810-007-0826ND
2017-03-075810-017-1101ND
2017-03-075810-143-1045ND
2017-03-085810-046-1101ND
2017-03-085810-074-0837ND
2017-03-159590-068-1220ND
2017-04-059590-068-0833ND
2017-05-099590-068-1252ND
2017-07-109590-068-0917ND
2017-07-249590-010-1310ND
2017-07-249590-023-0728ND
2017-08-149590-068-0831ND
2017-09-291677-068-1506ND
2017-10-169590-068-0856ND
2017-11-045810-007-0648ND
2017-11-065810-017-1114ND
2017-11-065810-052-0800ND
2017-11-065810-071-0906ND
2017-11-065810-091-0810ND
2017-11-079590-068-0940ND
2017-11-205810-134-1110ND
2017-12-119590-068-1253ND
2018-01-119590-068-0908ND
2018-02-059590-068-0840ND
2018-03-089590-068-0855ND
2018-04-035810-017-1040ND
2018-04-035810-071-0829ND
2018-04-095810-046-1252ND
2018-04-095810-052-0844ND
2018-04-099590-068-0925ND
2018-04-095810-091-0835ND
2018-04-125810-075-1152ND
2018-04-165810-029-0913ND
2018-04-169590-074-0845ND
2018-04-175810-038-1104ND
2018-05-039590-068-0826ND
2018-06-065810-007-0930ND
2018-06-139590-068-1015ND
2018-07-095810-046-0925ND
2018-07-095810-052-1154ND
2018-07-095810-071-0910ND
2018-07-095810-091-1200ND
2018-07-105810-074-0839ND
2018-07-115810-007-0952ND
2018-07-115810-143-0847ND
2018-09-139590-068-0933ND
2018-09-185810-052-1410ND
2018-09-185810-091-1414ND
2018-10-109590-068-0927ND
2018-10-165810-029-0754ND
2018-10-165810-056-0927ND
2018-11-209590-068-1006ND
2018-12-035810-071-0835ND
2018-12-045810-007-0815ND
2018-12-045810-017-0952ND
2018-12-045810-036-1022ND
2018-12-045810-037-0841ND
2018-12-055810-046-0924ND
2018-12-055810-052-0817ND
2018-12-055810-091-0808ND
2018-12-109590-068-1040ND
2019-01-085810-071-0836ND
2019-01-095810-017-1340ND
2019-01-095810-052-0910ND
2019-01-095810-091-0912ND
2019-01-105810-007-1109ND
2019-01-145810-046-0910ND
2019-01-149590-068-1023ND
2019-01-229590-029-0912ND
2019-01-229590-077-1100ND
2019-01-235810-900-1249ND
2019-01-235810-901-1152ND
2019-01-235810-902-1312ND
2019-01-235810-903-1336ND
2019-01-235810-904-1114ND
2019-01-235810-905-1131ND
2019-01-309590-074-0938ND
2019-02-075810-068-0828ND
2019-02-215810-134-1110ND
2019-03-045810-052-0900ND
2019-03-045810-091-0902ND
2019-03-205810-033-1120ND
2019-03-205810-136-0955ND
2019-03-229590-068-0535ND
2019-03-289590-068-0621ND
2019-04-109590-068-0941ND
2019-04-155810-029-0845ND
2019-05-075810-046-1325ND
2019-05-075810-052-1245ND
2019-05-075810-091-1255ND
2019-05-289590-068-0856ND
2019-06-109590-068-0853ND
2019-07-089590-068-0756ND
2019-08-069590-068-0921ND
2019-08-205810-020-0928ND
2019-08-205810-062-0751ND
2019-08-225810-052-1605ND
2019-08-225810-091-1607ND
2019-09-119590-068-0803ND
2019-10-169590-068-0827ND
2019-11-209590-068-0942ND
2019-12-049590-068-0851ND
2019-12-099590-068-0841ND
2019-12-179590-068-0933ND
2019-12-269590-068-1137ND
2019-12-309590-068-1050ND