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EWG's Tap Water Database — 2021 UPDATE

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Dichlorodifluoromethane

California Water Service (CWS) - Los Altos Suburban

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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116

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
2014ND150ND
20150.682 ppb191ND - 13.0 ppb
20160.879 ppb71ND - 6.15 ppb
2017ND420ND
2018ND190ND
2019ND140ND

ppb = parts per billion

All test results

Date Lab ID Result
2014-02-055701-024-1427ND
2014-02-265701-002-1423ND
2014-02-265701-010-1456ND
2014-02-265701-018-1055ND
2014-03-255701-011-1305ND
2014-03-255701-028-1530ND
2014-03-255701-030-1555ND
2014-04-225701-020-1340ND
2014-04-225701-021-1140ND
2014-04-225701-022-1238ND
2014-06-245701-028-0945ND
2014-07-225701-024-0923ND
2014-09-245701-028-1050ND
2014-10-215701-024-1545ND
2014-12-165701-028-1230ND
2015-01-215701-024-0905ND
2015-02-185701-002-1340ND
2015-02-185701-013-1145ND
2015-02-185701-016-0950ND
2015-02-185701-018-1315ND
2015-03-039590-057-1012ND
2015-03-185701-028-1100ND
2015-04-215701-024-1025ND
2015-06-165701-028-1117ND
2015-06-239590-013-1140ND
2015-06-239590-030-1030ND
2015-06-239590-057-1100ND
2015-07-205701-024-1145ND
2015-07-205701-029-1125ND
2015-08-245701-023-1130ND
2015-09-225701-028-110013.0 ppb
2015-09-225701-057-1130ND
2015-12-105701-008-1525ND
2015-12-175701-028-1115ND
2016-03-215701-028-0952ND
2016-06-015701-028-1014ND
2016-07-265701-037-1320ND
2016-09-215701-028-10466.15 ppb
2016-09-215701-032-1146ND
2016-09-215701-035-1130ND
2016-12-135810-028-1140ND
2017-01-119590-010-0930ND
2017-01-119590-011-0955ND
2017-01-185701-010-1045ND
2017-01-185701-011-1123ND
2017-02-079590-023-1255ND
2017-02-089590-021-1300ND
2017-02-145701-020-1546ND
2017-02-149590-020-1547ND
2017-02-145701-021-1624ND
2017-03-065701-022-1038ND
2017-03-159590-024-0915ND
2017-03-159590-028-1208ND
2017-03-155701-028-1234ND
2017-03-155701-030-1245ND
2017-04-049590-010-1400ND
2017-04-059590-016-1200ND
2017-04-069590-011-1110ND
2017-05-049590-020-1245ND
2017-05-049590-023-1200ND
2017-05-099590-021-1130ND
2017-06-139590-024-1142ND
2017-06-139590-028-1315ND
2017-06-265701-028-1420ND
2017-07-069590-002-1115ND
2017-07-069590-016-1145ND
2017-07-199590-008-1030ND
2017-08-099590-022-1150ND
2017-08-099590-037-1220ND
2017-08-235701-022-1315ND
2017-09-069590-029-1500ND
2017-09-069590-032-1230ND
2017-09-069590-035-1301ND
2017-09-265701-028-1430ND
2017-10-119590-002-1030ND
2017-10-119590-008-1345ND
2017-11-139590-037-1300ND
2017-11-149590-022-1300ND
2017-12-069590-035-1200ND
2017-12-129590-029-1045ND
2017-12-129590-032-1115ND
2017-12-135701-028-1520ND
2017-12-209590-018-1345ND
2018-02-069590-013-1015ND
2018-02-205701-013-1225ND
2018-02-205701-018-1215ND
2018-03-079590-030-1145ND
2018-03-215701-016-1245ND
2018-03-215701-028-1350ND
2018-04-259590-013-1030ND
2018-05-085701-023-1310ND
2018-06-069590-030-0930ND
2018-06-215701-024-0930ND
2018-06-215701-028-1131ND
2018-07-185701-029-0900ND
2018-09-189590-057-1234ND
2018-09-185701-057-1305ND
2018-09-245701-028-1200ND
2018-12-059590-057-1100ND
2018-12-129590-002-1400ND
2018-12-125810-008-1117ND
2018-12-125810-028-1535ND
2019-02-205701-002-1245ND
2019-06-185701-028-1510ND
2019-07-115701-024-1130ND
2019-07-245701-024-1800ND
2019-07-295701-024-1530ND
2019-08-065701-024-1145ND
2019-08-135701-024-1125ND
2019-08-195701-024-1325ND
2019-08-205810-037-1115ND
2019-08-265810-024-1355ND
2019-09-175701-028-1520ND
2019-09-175701-032-1530ND
2019-09-175701-035-1540ND
2019-12-165701-028-1330ND