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EWG's Tap Water Database — 2021 UPDATE

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Dichlorodifluoromethane

San Lorenzo Valley Water District

Dichlorodifluoromethane (Freon-12) is a refrigerant, solvent and aerosol propellant banned in 2000 under the Montreal Protocol because of its ozone-depleting properties. Freons can cause heart, nervous system and liver damage.

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45

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND70ND
2015ND170ND
2016ND10ND
2017ND20ND
2018ND170ND
2019ND10ND

ppb = parts per billion

All test results

Date Lab ID Result
2014-03-199590-034-1300ND
2014-05-219590-034-1530ND
2014-08-279590-034-1140ND
2014-08-279590-034-1140ND
2014-09-109590-025-1100ND
2014-11-189590-034-1200ND
2014-11-189590-034-1200ND
2015-02-109590-034-1130ND
2015-02-109590-034-1130ND
2015-05-209590-034-1445ND
2015-05-209590-034-1445ND
2015-06-179590-023-1230ND
2015-06-179590-024-1215ND
2015-06-239590-010-1430ND
2015-06-239590-026-1515ND
2015-06-309590-025-1400ND
2015-07-279590-022-1500ND
2015-08-059590-034-1445ND
2015-08-059590-024-1500ND
2015-08-059590-023-1430ND
2015-08-199590-026-1500ND
2015-08-199590-010-1400ND
2015-08-199590-022-1415ND
2015-08-199590-025-1445ND
2016-07-149590-025-1055ND
2017-07-119590-025-0845ND
2017-08-029590-025-0900ND
2018-02-129590-034-0900ND
2018-03-019590-025-0945ND
2018-03-019590-026-0910ND
2018-03-069590-024-1045ND
2018-04-179590-022-1400ND
2018-05-079590-034-0900ND
2018-06-129590-025-1015ND
2018-06-129590-010-1659ND
2018-06-129590-026-0945ND
2018-07-059590-025-1030ND
2018-07-059590-034-0915ND
2018-07-059590-026-1000ND
2018-07-179590-022-1400ND
2018-07-189590-022-1045ND
2018-07-189590-010-1030ND
2018-08-149590-024-0830ND
2018-09-049590-010-0900ND
2019-12-129590-025-0940ND