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EWG's Tap Water Database — 2021 UPDATE

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Tetrachloroethylene (perchloroethylene)

Crescenta Valley CWD

Dry cleaning chemical tetrachloroethylene, or perc, can cause cancer. It pollutes soil and groundwater due to emissions from dry cleaning facilities, and automotive, metalworking and other industries. Read More.

The EPA considers tetrachloroethylene a likely human carcinogen. It has been linked with increased incidence of lung, breast and colon cancers. Tetrachloroethylene also damages the liver, kidneys and central nervous system. The California public health goal of 0.06 parts per billion, set to protect against cancer, is 80 times lower than the amount allowed by the federal government, which is a Maximum Contaminant Level of 5 parts per billion.

Click here to read more about carcinogenic VOCs.

MORE ABOUT THIS CONTAMINANT

 

308

Samples

0

Samples exceeding legal limit (MCL)

80

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.0531 ppb454ND - 0.680 ppb
20150.0206 ppb522ND - 0.560 ppb
20160.331 ppb5325ND - 1.000 ppb
20170.198 ppb5318ND - 0.700 ppb
20180.179 ppb5214ND - 0.960 ppb
20190.215 ppb5317ND - 0.880 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for tetrachloroethylene was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL) 5 ppb

The legal limit for tetrachloroethylene, established in 1991, was based on analytical detection limits at the time that the standard was set. This limit does not fully protect against the risk of cancer due to tetrachloroethylene exposure.

ppb = parts per billion

All test results

Date Lab ID Result
2014-01-145806-014-1010ND
2014-01-215806-014-1003ND
2014-01-285806-014-1020ND
2014-02-045806-014-1205ND
2014-02-115806-014-1003ND
2014-02-185806-014-1052ND
2014-02-255806-014-1023ND
2014-03-045806-014-11120.570 ppb
2014-03-115806-014-0938ND
2014-03-185806-014-1133ND
2014-03-255806-014-0958ND
2014-04-015806-014-1040ND
2014-04-085806-014-0913ND
2014-04-155806-014-0947ND
2014-04-225806-014-0949ND
2014-05-065806-014-1031ND
2014-05-135806-014-1042ND
2014-05-205806-014-1127ND
2014-05-275806-014-1005ND
2014-06-035806-014-0950ND
2014-06-105806-014-1036ND
2014-06-175806-014-1144ND
2014-06-245806-014-1018ND
2014-07-015806-014-08580.540 ppb
2014-07-085806-014-10360.600 ppb
2014-07-155806-014-1031ND
2014-07-225806-014-0950ND
2014-07-295806-014-0950ND
2014-08-055806-001-1130ND
2014-08-055806-014-1122ND
2014-08-125806-014-0905ND
2014-08-195806-014-0950ND
2014-08-265806-014-1020ND
2014-09-025806-014-1109ND
2014-09-095806-014-1108ND
2014-09-165806-014-1021ND
2014-09-235806-014-1115ND
2014-09-305806-014-0933ND
2014-10-075806-014-1010ND
2014-10-145806-014-1038ND
2014-11-055806-014-1020ND
2014-11-125806-014-0939ND
2014-12-165806-014-10010.680 ppb
2014-12-235806-014-0957ND
2014-12-305806-014-1026ND
2015-01-065806-014-0956ND
2015-01-135806-014-0928ND
2015-01-205806-014-0928ND
2015-01-275806-014-1123ND
2015-02-035806-014-0803ND
2015-02-105806-014-1056ND
2015-02-175806-014-1027ND
2015-02-245806-014-1051ND
2015-03-035806-014-1144ND
2015-03-105806-014-09490.560 ppb
2015-03-175806-014-0944ND
2015-03-245806-014-1200ND
2015-04-075806-014-09470.510 ppb
2015-04-145806-014-0950ND
2015-04-215806-014-1029ND
2015-04-285806-014-0946ND
2015-05-055806-001-1120ND
2015-05-055806-014-0956ND
2015-05-135806-014-0930ND
2015-05-195806-014-1043ND
2015-05-265806-014-1044ND
2015-06-025806-014-0920ND
2015-06-095806-014-0945ND
2015-06-165806-014-1138ND
2015-06-235806-014-1012ND
2015-06-305806-014-0955ND
2015-07-075806-014-1018ND
2015-07-145806-014-0841ND
2015-07-215806-014-0933ND
2015-07-285806-014-1015ND
2015-08-045806-014-1051ND
2015-08-115806-014-0921ND
2015-08-185806-014-1120ND
2015-08-255806-014-0904ND
2015-09-025806-014-1019ND
2015-09-085806-014-1031ND
2015-09-165806-014-0932ND
2015-09-225806-014-0946ND
2015-09-295806-014-1038ND
2015-10-065806-014-1030ND
2015-10-135806-014-0827ND
2015-10-205806-014-0910ND
2015-10-275806-014-0927ND
2015-11-035806-014-1017ND
2015-11-105806-014-0953ND
2015-11-175806-014-1001ND
2015-11-245806-014-1000ND
2015-12-015806-014-0940ND
2015-12-085806-014-1010ND
2015-12-155806-014-1101ND
2015-12-225806-014-0940ND
2015-12-295806-014-0952ND
2016-01-055806-014-10470.510 ppb
2016-01-125806-014-10490.530 ppb
2016-01-195806-014-1004ND
2016-01-265806-014-10080.540 ppb
2016-02-025806-014-10270.600 ppb
2016-02-095806-014-10080.690 ppb
2016-02-165806-014-09540.710 ppb
2016-02-235806-014-00000.680 ppb
2016-03-015806-014-08370.690 ppb
2016-03-085806-014-09581.000 ppb
2016-03-165806-014-09421.000 ppb
2016-03-225806-014-09540.780 ppb
2016-03-295806-014-09390.820 ppb
2016-04-065806-014-09150.920 ppb
2016-04-125806-014-09270.840 ppb
2016-04-195806-014-09300.760 ppb
2016-04-265806-014-10030.990 ppb
2016-05-035806-001-1048ND
2016-05-045806-014-09330.660 ppb
2016-05-105806-014-10140.780 ppb
2016-05-175806-014-10370.650 ppb
2016-05-245806-014-09320.550 ppb
2016-05-315806-014-10030.580 ppb
2016-06-075806-014-09080.620 ppb
2016-06-145806-014-08470.590 ppb
2016-06-215806-014-09280.610 ppb
2016-06-285806-014-1020ND
2016-07-065806-014-1057ND
2016-07-125806-014-1022ND
2016-07-195806-014-1129ND
2016-07-265806-014-0818ND
2016-08-025806-014-1254ND
2016-08-095806-014-0949ND
2016-08-165806-014-1042ND
2016-08-235806-014-1013ND
2016-08-305806-014-0918ND
2016-09-065806-014-1111ND
2016-09-135806-014-1025ND
2016-09-205806-014-09400.420 ppb
2016-09-275806-014-1051ND
2016-10-045806-014-1102ND
2016-10-115806-014-1042ND
2016-10-185806-014-1058ND
2016-10-255806-014-1025ND
2016-11-015806-014-1017ND
2016-11-085806-014-1009ND
2016-11-155806-014-1250ND
2016-11-225806-014-1003ND
2016-11-295806-014-0942ND
2016-12-065806-014-1104ND
2016-12-135806-014-1112ND
2016-12-205806-014-1011ND
2016-12-275806-014-1038ND
2017-01-035806-014-11200.540 ppb
2017-01-105806-014-11210.640 ppb
2017-01-175806-014-09460.610 ppb
2017-01-245806-014-10150.560 ppb
2017-01-315806-014-08580.620 ppb
2017-02-075806-014-10010.590 ppb
2017-02-145806-014-09030.560 ppb
2017-02-215806-001-1125ND
2017-02-215806-014-09590.700 ppb
2017-02-285806-014-10260.700 ppb
2017-03-075806-014-09570.590 ppb
2017-03-145806-014-1033ND
2017-03-215806-014-0835ND
2017-03-285806-014-1051ND
2017-04-045806-014-0850ND
2017-04-115806-014-0948ND
2017-04-185806-014-1043ND
2017-04-255806-014-1050ND
2017-05-025806-014-1024ND
2017-05-095806-014-1011ND
2017-05-165806-014-1103ND
2017-05-235806-014-1008ND
2017-05-305806-014-1035ND
2017-06-065806-014-1315ND
2017-06-135806-014-0921ND
2017-06-205806-014-0956ND
2017-06-275806-014-0747ND
2017-07-055806-014-1146ND
2017-07-115806-014-1017ND
2017-07-185806-014-1123ND
2017-07-255806-014-1311ND
2017-08-015806-014-1150ND
2017-08-085806-014-0950ND
2017-08-155806-014-1112ND
2017-08-225806-014-1200ND
2017-08-295806-014-0925ND
2017-09-055806-014-1125ND
2017-09-125806-014-0921ND
2017-09-195806-014-1121ND
2017-09-265806-014-1100ND
2017-10-035806-014-1041ND
2017-10-105806-014-10040.580 ppb
2017-10-175806-014-0948ND
2017-10-245806-014-09440.500 ppb
2017-10-315806-014-11300.540 ppb
2017-11-075806-014-11300.620 ppb
2017-11-145806-014-10300.610 ppb
2017-11-215806-014-0954ND
2017-11-285806-014-11300.530 ppb
2017-12-065806-014-1133ND
2017-12-125806-014-0918ND
2017-12-195806-014-10210.500 ppb
2017-12-275806-014-11210.500 ppb
2018-01-035806-014-08020.520 ppb
2018-01-105806-014-10000.850 ppb
2018-01-165806-014-09590.920 ppb
2018-01-235806-014-10400.520 ppb
2018-01-305806-014-1106ND
2018-02-065806-014-0950ND
2018-02-135806-014-1004ND
2018-02-205806-014-09090.640 ppb
2018-02-275806-014-10330.530 ppb
2018-03-065806-014-08450.540 ppb
2018-03-135806-014-10020.810 ppb
2018-03-205806-014-10000.720 ppb
2018-03-275806-014-10010.960 ppb
2018-04-035806-014-0901ND
2018-04-105806-014-1035ND
2018-04-175806-014-1000ND
2018-04-245806-014-0953ND
2018-05-015806-014-1112ND
2018-05-085806-014-1042ND
2018-05-155806-014-1126ND
2018-05-225806-014-1033ND
2018-05-305806-014-10290.600 ppb
2018-06-055806-014-08560.580 ppb
2018-06-125806-014-1048ND
2018-06-195806-014-1106ND
2018-06-265806-014-08270.560 ppb
2018-07-035806-014-09460.540 ppb
2018-07-105806-014-1202ND
2018-07-185806-014-1012ND
2018-07-245806-014-0906ND
2018-07-315806-014-0957ND
2018-08-095806-014-0859ND
2018-08-145806-014-0944ND
2018-08-215806-014-1028ND
2018-08-285806-014-1127ND
2018-09-045806-014-1306ND
2018-09-115806-014-1022ND
2018-09-185806-014-1032ND
2018-09-255806-014-0950ND
2018-10-025806-014-0900ND
2018-10-095806-014-1016ND
2018-10-165806-014-0917ND
2018-10-235806-014-0924ND
2018-10-305806-014-1116ND
2018-11-065806-014-1244ND
2018-11-135806-014-1038ND
2018-11-195806-014-0958ND
2018-11-275806-014-1141ND
2018-12-045806-014-1200ND
2018-12-115806-014-1042ND
2018-12-185806-014-1011ND
2018-12-265806-014-1026ND
2019-01-025806-014-1229ND
2019-01-085806-014-0857ND
2019-01-155806-014-0843ND
2019-01-225806-014-11160.550 ppb
2019-01-295806-014-09070.550 ppb
2019-02-055806-014-11460.620 ppb
2019-02-125806-001-1021ND
2019-02-125806-014-10450.880 ppb
2019-02-195806-014-11130.800 ppb
2019-02-265806-014-11210.720 ppb
2019-03-055806-014-11540.580 ppb
2019-03-125806-014-11530.880 ppb
2019-03-195806-014-11310.620 ppb
2019-03-265806-014-11020.770 ppb
2019-04-025806-014-10400.630 ppb
2019-04-095806-014-11030.580 ppb
2019-04-165806-014-1218ND
2019-04-235806-014-10510.740 ppb
2019-04-295806-014-1104ND
2019-05-075806-014-1132ND
2019-05-145806-014-1238ND
2019-05-285806-014-1120ND
2019-06-045806-014-1149ND
2019-06-115806-014-1031ND
2019-06-185806-014-0853ND
2019-06-255806-014-1249ND
2019-07-025806-014-0846ND
2019-07-095806-014-1016ND
2019-07-125806-014-0947ND
2019-07-235806-014-1010ND
2019-07-295806-014-1140ND
2019-08-055806-014-0857ND
2019-08-135806-014-0849ND
2019-08-205806-014-0900ND
2019-08-275806-014-1029ND
2019-09-035806-014-0911ND
2019-09-105806-014-1057ND
2019-09-175806-014-11570.550 ppb
2019-09-245806-014-1107ND
2019-10-015806-014-1021ND
2019-10-085806-014-1018ND
2019-10-155806-014-1106ND
2019-10-225806-014-0847ND
2019-10-305806-014-0913ND
2019-11-045806-014-1015ND
2019-11-125806-014-1047ND
2019-11-195806-014-1215ND
2019-11-255806-014-1144ND
2019-12-035806-014-10580.580 ppb
2019-12-105806-014-10010.630 ppb
2019-12-165806-014-10560.720 ppb
2019-12-235806-014-1116ND
2019-12-305806-014-1010ND