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EWG's Tap Water Database — 2021 UPDATE

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Dichlorodifluoromethane

San Francisco City Water System

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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21

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014N/A00N/A
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018ND210ND
2019N/A00N/A

ppb = parts per billion

All test results

Date Lab ID Result
2018-01-119590-007-1115ND
2018-03-069590-004-1031ND
2018-03-069590-008-0914ND
2018-03-089590-006-0925ND
2018-03-089590-006-0925ND
2018-04-179590-007-1055ND
2018-04-179590-007-1055ND
2018-06-129590-004-1058ND
2018-06-129590-008-0930ND
2018-06-129590-008-0930ND
2018-06-129590-006-1012ND
2018-06-129590-004-1058ND
2018-07-179590-007-0519ND
2018-07-179590-007-0519ND
2018-09-189590-006-0945ND
2018-09-189590-004-0855ND
2018-09-189590-008-1025ND
2018-10-179590-007-0730ND
2018-12-119590-006-0915ND
2018-12-119590-004-0845ND
2018-12-119590-008-1045ND