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EWG's Tap Water Database — 2021 UPDATE

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Dichlorodifluoromethane

Montara Water and Sanitary 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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107

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND170ND
2015ND120ND
2016ND150ND
2017ND360ND
2018ND170ND
2019ND100ND

ppb = parts per billion

All test results

Date Lab ID Result
2014-01-201233-030-1150ND
2014-01-201233-031-1140ND
2014-01-201233-032-1110ND
2014-04-211233-030-1050ND
2014-04-211233-031-1030ND
2014-04-211233-032-1100ND
2014-05-135810-003-1000ND
2014-08-275810-001-1140ND
2014-08-275810-008-0845ND
2014-08-275810-011-0900ND
2014-08-275810-012-1200ND
2014-08-275810-014-1020ND
2014-08-275810-015-1120ND
2014-09-035810-010-1400ND
2014-10-201233-030-1020ND
2014-10-201233-031-1010ND
2014-10-201233-032-1025ND
2015-01-191233-030-1055ND
2015-01-191233-031-1110ND
2015-01-191233-032-1000ND
2015-04-201233-031-1035ND
2015-04-201233-032-1045ND
2015-05-181233-030-1040ND
2015-07-201233-030-1110ND
2015-07-201233-031-1100ND
2015-07-201233-032-1120ND
2015-10-191233-030-0850ND
2015-10-191233-031-1050ND
2015-10-191233-032-1015ND
2016-01-181233-030-1020ND
2016-01-181233-031-1110ND
2016-01-181233-032-1030ND
2016-01-285810-011-0930ND
2016-05-185810-030-1200ND
2016-05-185810-031-1150ND
2016-05-185810-032-1215ND
2016-09-155810-030-1035ND
2016-09-155810-031-1015ND
2016-09-155810-032-1045ND
2016-12-015810-031-1015ND
2016-12-015810-032-1035ND
2016-12-135810-030-1158ND
2016-12-191233-809-1100ND
2016-12-191233-811-1105ND
2017-01-255810-030-0915ND
2017-01-255810-031-0900ND
2017-01-255810-032-0930ND
2017-02-135810-809-1121ND
2017-02-135810-811-1122ND
2017-03-205810-809-1020ND
2017-03-205810-811-1027ND
2017-04-135810-003-1020ND
2017-04-135810-030-1020ND
2017-04-135810-031-1000ND
2017-04-135810-032-1040ND
2017-04-195810-809-1049ND
2017-04-195810-811-1059ND
2017-05-085810-809-1200ND
2017-05-085810-811-1200ND
2017-06-065810-809-1150ND
2017-06-065810-811-1150ND
2017-07-055810-809-1145ND
2017-07-055810-811-1145ND
2017-07-205810-003-1120ND
2017-08-075810-001-0900ND
2017-08-075810-008-1010ND
2017-08-075810-010-0915ND
2017-08-075810-012-1000ND
2017-08-075810-014-0930ND
2017-08-075810-015-0915ND
2017-08-075810-809-1100ND
2017-08-075810-811-1100ND
2017-09-065810-030-1110ND
2017-11-085810-001-1105ND
2017-11-085810-014-0920ND
2017-11-095810-030-1120ND
2017-11-095810-031-1040ND
2017-11-095810-032-1130ND
2017-11-095810-809-1100ND
2017-11-095810-811-1100ND
2018-02-075810-030-1315ND
2018-02-075810-031-1305ND
2018-02-075810-032-1400ND
2018-02-085810-014-0845ND
2018-02-085810-809-0930ND
2018-02-085810-811-0933ND
2018-06-185810-809-1210ND
2018-06-185810-811-1215ND
2018-07-265810-030-1100ND
2018-07-265810-031-1140ND
2018-07-265810-032-1110ND
2018-10-155810-809-0920ND
2018-10-155810-811-0920ND
2018-11-135810-015-0840ND
2018-11-155810-030-0900ND
2018-11-155810-031-0815ND
2018-11-155810-032-0835ND
2019-02-055810-809-1115ND
2019-02-055810-811-1110ND
2019-02-125810-015-0935ND
2019-02-195810-030-0940ND
2019-02-195810-031-0910ND
2019-02-195810-032-1000ND
2019-07-095810-809-1140ND
2019-07-095810-811-1140ND
2019-12-035810-809-0909ND
2019-12-035810-811-0913ND