Know Your Environment. Protect Your Health.

Tetrachloroethylene (perchloroethylene)

Las Flores Water Company

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.

 

490

Samples

49

Samples exceeding legal limit (MCL)

383

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.614 ppb10262ND - 2.10 ppb
20190.824 ppb10971ND - 2.60 ppb
20201.36 ppb10697ND - 3.00 ppb
20212.78 ppb10383ND - 11.0 ppb
20225.47 ppb70700.650 ppb - 12.0 ppb
2023N/A00N/A

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2018-01-02CA1910061_003_003-2018010206301.30 ppb
2018-01-02CA1910061_005_005-201801020540ND
2018-01-02CA1910061_006_006-2018010205300.500 ppb
2018-01-08CA1910061_006_006-201801080530ND
2018-01-08CA1910061_003_003-2018010806301.30 ppb
2018-01-16CA1910061_006_006-201801160920ND
2018-01-16CA1910061_003_003-2018011609001.10 ppb
2018-01-22CA1910061_003_003-2018012206301.10 ppb
2018-01-22CA1910061_006_006-201801220540ND
2018-01-29CA1910061_006_006-201801290530ND
2018-01-29CA1910061_003_003-2018012905451.10 ppb
2018-02-05CA1910061_003_003-2018020508051.20 ppb
2018-02-05CA1910061_006_006-2018020508150.600 ppb
2018-02-12CA1910061_003_003-2018021208001.20 ppb
2018-02-12CA1910061_006_006-201802120730ND
2018-02-20CA1910061_003_003-2018022005451.10 ppb
2018-02-20CA1910061_006_006-2018022005300.600 ppb
2018-02-26CA1910061_003_003-2018022607001.000 ppb
2018-02-26CA1910061_006_006-201802260645ND
2018-03-05CA1910061_003_003-2018030509450.800 ppb
2018-03-05CA1910061_006_006-201803050930ND
2018-03-12CA1910061_003_003-2018031209201.30 ppb
2018-03-12CA1910061_006_006-201803120930ND
2018-03-19CA1910061_006_006-2018031909170.500 ppb
2018-03-19CA1910061_003_003-2018031909101.50 ppb
2018-03-26CA1910061_003_003-2018032609451.10 ppb
2018-03-26CA1910061_006_006-2018032610000.500 ppb
2018-04-02CA1910061_003_003-2018040208451.000 ppb
2018-04-02CA1910061_005_005-201804020910ND
2018-04-02CA1910061_006_006-2018040209000.500 ppb
2018-04-09CA1910061_003_003-2018040908001.40 ppb
2018-04-09CA1910061_006_006-2018040908050.700 ppb
2018-04-16CA1910061_006_006-2018041608000.520 ppb
2018-04-16CA1910061_003_003-2018041605301.30 ppb
2018-04-23CA1910061_003_003-2018042305451.20 ppb
2018-04-23CA1910061_006_006-201804230530ND
2018-04-30CA1910061_003_003-201804300540ND
2018-04-30CA1910061_006_006-201804300800ND
2018-05-07CA1910061_006_006-201805070910ND
2018-05-07CA1910061_003_003-2018050708210.780 ppb
2018-05-14CA1910061_003_003-2018051407201.10 ppb
2018-05-14CA1910061_006_006-201805140730ND
2018-05-21CA1910061_006_006-2018052105450.530 ppb
2018-05-21CA1910061_003_003-2018052105301.60 ppb
2018-05-29CA1910061_003_003-2018052905300.960 ppb
2018-05-29CA1910061_006_006-201805290545ND
2018-06-04CA1910061_003_003-2018060409000.760 ppb
2018-06-04CA1910061_006_006-201806040930ND
2018-06-11CA1910061_003_003-2018061107501.60 ppb
2018-06-11CA1910061_006_006-2018061107350.600 ppb
2018-06-18CA1910061_003_003-2018061805451.20 ppb
2018-06-18CA1910061_006_006-201806180645ND
2018-06-25CA1910061_003_003-2018062509000.590 ppb
2018-06-25CA1910061_006_006-201806250930ND
2018-07-03CA1910061_006_006-201807030620ND
2018-07-03CA1910061_003_003-2018070306000.840 ppb
2018-07-09CA1910061_003_003-2018070907002.10 ppb
2018-07-09CA1910061_005_005-201807090800ND
2018-07-09CA1910061_006_006-2018070907150.500 ppb
2018-07-16CA1910061_006_006-201807160830ND
2018-07-16CA1910061_003_003-2018071608001.20 ppb
2018-07-23CA1910061_006_006-201807230900ND
2018-07-23CA1910061_003_003-2018072308301.000 ppb
2018-07-30CA1910061_006_006-201807300900ND
2018-07-30CA1910061_003_003-2018073008451.10 ppb
2018-08-06CA1910061_003_003-2018080609101.30 ppb
2018-08-06CA1910061_006_006-201808060920ND
2018-08-13CA1910061_003_003-2018081308301.60 ppb
2018-08-13CA1910061_006_006-201808130845ND
2018-08-20CA1910061_003_003-2018082008401.60 ppb
2018-08-20CA1910061_006_006-201808200850ND
2018-08-27CA1910061_006_006-201808270845ND
2018-08-27CA1910061_003_003-2018082708301.50 ppb
2018-09-04CA1910061_006_006-201809040920ND
2018-09-04CA1910061_003_003-2018090409000.920 ppb
2018-09-10CA1910061_003_003-2018091008450.590 ppb
2018-09-10CA1910061_006_006-201809100900ND
2018-09-10CA1910061_006_006-201809100920ND
2018-09-10CA1910061_003_003-2018091009000.590 ppb
2018-09-17CA1910061_003_003-2018091707001.20 ppb
2018-09-17CA1910061_006_006-201809170730ND
2018-09-24CA1910061_006_006-2018092408300.580 ppb
2018-09-24CA1910061_003_003-2018092408001.10 ppb
2018-10-01CA1910061_006_006-201810011245ND
2018-10-01CA1910061_003_003-2018100113000.680 ppb
2018-10-15CA1910061_003_003-2018101509300.650 ppb
2018-10-15CA1910061_006_006-201810151000ND
2018-11-12CA1910061_005_005-201811120930ND
2018-11-12CA1910061_006_006-201811120920ND
2018-11-12CA1910061_003_003-2018111209000.970 ppb
2018-11-19CA1910061_003_003-2018111908000.830 ppb
2018-11-19CA1910061_006_006-201811190820ND
2018-11-26CA1910061_003_003-2018112609501.000 ppb
2018-11-26CA1910061_006_006-201811261000ND
2018-12-03CA1910061_003_003-2018120309001.50 ppb
2018-12-03CA1910061_006_006-201812030930ND
2018-12-10CA1910061_003_003-2018121009001.70 ppb
2018-12-10CA1910061_006_006-2018121009200.550 ppb
2018-12-19CA1910061_003_003-2018121909000.940 ppb
2018-12-19CA1910061_006_006-20181219NUL0.500 ppb
2018-12-26CA1910061_003_003-2018122607001.40 ppb
2018-12-26CA1910061_006_006-201812260730ND
2019-01-02CA1910061_006_006-201901020800ND
2019-01-02CA1910061_003_003-2019010207451.000 ppb
2019-01-07CA1910061_006_006-2019010709200.520 ppb
2019-01-07CA1910061_003_003-2019010709001.60 ppb
2019-01-14CA1910061_006_006-201901140920ND
2019-01-14CA1910061_003_003-2019011409000.950 ppb
2019-01-21CA1910061_006_006-201901210945ND
2019-01-21CA1910061_003_003-2019012109300.880 ppb
2019-01-28CA1910061_006_006-201901280930ND
2019-01-28CA1910061_003_003-2019012809001.20 ppb
2019-02-04CA1910061_006_006-201902040945ND
2019-02-04CA1910061_003_003-2019020409300.780 ppb
2019-02-11CA1910061_003_003-2019021109001.30 ppb
2019-02-11CA1910061_006_006-201902110910ND
2019-02-19CA1910061_003_003-2019021908001.000 ppb
2019-02-19CA1910061_006_006-201902190900ND
2019-02-25CA1910061_006_006-201902250920ND
2019-02-25CA1910061_003_003-2019022509000.960 ppb
2019-03-04CA1910061_005_005-201903041040ND
2019-03-04CA1910061_006_006-201903041030ND
2019-03-04CA1910061_003_003-2019030410001.20 ppb
2019-03-12CA1910061_003_003-2019031209260.630 ppb
2019-03-12CA1910061_006_006-201903120935ND
2019-03-18CA1910061_003_003-2019031809401.20 ppb
2019-03-18CA1910061_006_006-201903180950ND
2019-03-25CA1910061_003_003-2019032509350.970 ppb
2019-03-25CA1910061_006_006-201903250950ND
2019-04-01CA1910061_006_006-201904010820ND
2019-04-01CA1910061_003_003-2019040108000.920 ppb
2019-04-08CA1910061_006_006-201904080810ND
2019-04-08CA1910061_003_003-2019040808000.700 ppb
2019-04-15CA1910061_003_003-2019041509001.40 ppb
2019-04-15CA1910061_006_006-201904150920ND
2019-04-22CA1910061_003_003-2019042207301.70 ppb
2019-04-22CA1910061_006_006-201904220740ND
2019-04-29CA1910061_003_003-2019042909150.960 ppb
2019-04-29CA1910061_006_006-201904290925ND
2019-05-06CA1910061_003_003-2019050608001.80 ppb
2019-05-06CA1910061_006_006-2019050608200.730 ppb
2019-05-13CA1910061_003_003-2019051308001.80 ppb
2019-05-13CA1910061_006_006-201905130820ND
2019-05-20CA1910061_003_003-2019052008001.80 ppb
2019-05-20CA1910061_006_006-2019052008400.530 ppb
2019-05-28CA1910061_006_006-201905280845ND
2019-05-28CA1910061_003_003-2019052808301.000 ppb
2019-06-03CA1910061_006_006-2019060306450.600 ppb
2019-06-03CA1910061_003_003-2019060306302.60 ppb
2019-06-10CA1910061_006_006-2019061008000.760 ppb
2019-06-10CA1910061_003_003-2019061007301.80 ppb
2019-06-17CA1910061_006_006-201906170920ND
2019-06-17CA1910061_003_003-2019061709000.910 ppb
2019-06-24CA1910061_003_003-2019062408301.90 ppb
2019-06-24CA1910061_006_006-201906240845ND
2019-07-01CA1910061_006_006-2019070109200.530 ppb
2019-07-01CA1910061_003_003-2019070109002.10 ppb
2019-07-08CA1910061_006_006-2019070807450.640 ppb
2019-07-08CA1910061_003_003-2019070807301.70 ppb
2019-07-15CA1910061_006_006-2019071506200.530 ppb
2019-07-15CA1910061_003_003-2019071506001.90 ppb
2019-07-22CA1910061_003_003-2019072209301.10 ppb
2019-07-22CA1910061_006_006-201907220945ND
2019-07-29CA1910061_003_003-2019072906001.80 ppb
2019-07-29CA1910061_006_006-201907290620ND
2019-07-29CA1910061_005_005-201907290630ND
2019-08-05CA1910061_006_006-2019080508000.600 ppb
2019-08-05CA1910061_003_003-2019080507452.10 ppb
2019-08-12CA1910061_003_003-2019081206001.70 ppb
2019-08-12CA1910061_006_006-201908120615ND
2019-08-19CA1910061_006_006-2019081908150.530 ppb
2019-08-19CA1910061_003_003-2019081908001.80 ppb
2019-08-26CA1910061_003_003-2019082607001.90 ppb
2019-08-26CA1910061_006_006-201908260720ND
2019-09-03CA1910061_003_003-2019090307152.10 ppb
2019-09-03CA1910061_006_006-2019090307300.540 ppb
2019-09-09CA1910061_003_003-2019090909451.40 ppb
2019-09-09CA1910061_006_006-201909090955ND
2019-09-16CA1910061_006_006-201909160730ND
2019-09-16CA1910061_003_003-2019091607151.40 ppb
2019-09-23CA1910061_006_006-201909230945ND
2019-09-23CA1910061_003_003-2019092309301.20 ppb
2019-09-30CA1910061_003_003-2019093009301.000 ppb
2019-09-30CA1910061_006_006-201909300945ND
2019-10-07CA1910061_003_003-2019100707202.40 ppb
2019-10-07CA1910061_006_006-201910070730ND
2019-10-14CA1910061_003_003-2019101407002.10 ppb
2019-10-14CA1910061_006_006-2019101407150.570 ppb
2019-10-21CA1910061_003_003-2019102109301.60 ppb
2019-10-21CA1910061_006_006-201910210945ND
2019-10-28CA1910061_006_006-201910280555ND
2019-10-28CA1910061_003_003-2019102805401.80 ppb
2019-11-04CA1910061_005_005-201911040845ND
2019-11-04CA1910061_003_003-2019110409001.10 ppb
2019-11-04CA1910061_006_006-201911040915ND
2019-11-11CA1910061_003_003-2019111107001.80 ppb
2019-11-11CA1910061_006_006-201911110715ND
2019-11-18CA1910061_003_003-2019111807002.10 ppb
2019-11-18CA1910061_006_006-2019111807200.600 ppb
2019-11-25CA1910061_003_003-2019112506252.10 ppb
2019-11-25CA1910061_006_006-2019112506400.700 ppb
2019-12-02CA1910061_003_003-2019120209001.40 ppb
2019-12-02CA1910061_006_006-2019120209150.500 ppb
2019-12-09CA1910061_003_003-2019120909301.30 ppb
2019-12-09CA1910061_006_006-2019120909450.910 ppb
2019-12-16CA1910061_003_003-2019121608451.60 ppb
2019-12-16CA1910061_006_006-2019121609000.710 ppb
2019-12-23CA1910061_006_006-201912230700ND
2019-12-23CA1910061_003_003-2019122306451.50 ppb
2019-12-30CA1910061_006_006-2019123009300.620 ppb
2019-12-30CA1910061_003_003-2019123009151.70 ppb
2020-01-06CA1910061_003_003-2020010606302.80 ppb
2020-01-06CA1910061_006_006-2020010606400.650 ppb
2020-01-13CA1910061_003_003-2020011309301.60 ppb
2020-01-13CA1910061_006_006-2020011309450.610 ppb
2020-01-20CA1910061_003_003-2020012007002.20 ppb
2020-01-20CA1910061_006_006-202001200720ND
2020-01-27CA1910061_003_003-2020012709002.20 ppb
2020-01-27CA1910061_006_006-2020012709150.740 ppb
2020-02-03CA1910061_006_006-2020020308450.680 ppb
2020-02-03CA1910061_003_003-2020020308302.40 ppb
2020-02-10CA1910061_003_003-2020021008152.60 ppb
2020-02-10CA1910061_006_006-2020021008301.000 ppb
2020-02-18CA1910061_003_003-2020021808002.60 ppb
2020-02-18CA1910061_006_006-202002180820ND
2020-02-24CA1910061_006_006-2020022409300.730 ppb
2020-02-24CA1910061_003_003-2020022409152.00 ppb
2020-03-02CA1910061_006_006-2020030206300.790 ppb
2020-03-02CA1910061_003_003-2020030206452.30 ppb
2020-03-02CA1910061_005_005-202003020635ND
2020-03-09CA1910061_006_006-2020030907300.700 ppb
2020-03-09CA1910061_003_003-2020030907152.10 ppb
2020-03-16CA1910061_003_003-2020031608002.10 ppb
2020-03-16CA1910061_006_006-202003160800ND
2020-03-23CA1910061_003_003-2020032310001.60 ppb
2020-03-23CA1910061_006_006-2020032310000.500 ppb
2020-03-30CA1910061_003_003-2020033010081.90 ppb
2020-03-30CA1910061_006_006-2020033010000.600 ppb
2020-04-06CA1910061_003_003-2020040608302.30 ppb
2020-04-06CA1910061_006_006-2020040608450.800 ppb
2020-04-13CA1910061_003_003-2020041309002.40 ppb
2020-04-13CA1910061_006_006-2020041309000.940 ppb
2020-04-20CA1910061_003_003-2020042009002.00 ppb
2020-04-20CA1910061_006_006-2020042009100.670 ppb
2020-04-27CA1910061_003_003-2020042709452.20 ppb
2020-04-27CA1910061_006_006-2020042710000.790 ppb
2020-05-04CA1910061_003_003-2020050409001.90 ppb
2020-05-04CA1910061_006_006-2020050409100.710 ppb
2020-05-11CA1910061_003_003-2020051107502.40 ppb
2020-05-11CA1910061_006_006-2020051107400.800 ppb
2020-05-11CA1910061_005_005-202005110800ND
2020-05-18CA1910061_003_003-2020051810402.10 ppb
2020-05-18CA1910061_006_006-2020051810300.800 ppb
2020-05-26CA1910061_006_006-2020052609300.500 ppb
2020-05-26CA1910061_003_003-2020052609401.80 ppb
2020-06-01CA1910061_003_003-2020060109402.00 ppb
2020-06-01CA1910061_006_006-2020060109500.700 ppb
2020-06-08CA1910061_006_006-2020060808000.660 ppb
2020-06-08CA1910061_003_003-2020060807502.40 ppb
2020-06-15CA1910061_006_006-2020061509100.590 ppb
2020-06-22CA1910061_003_003-2020062208002.80 ppb
2020-06-22CA1910061_006_006-2020062208300.950 ppb
2020-06-29CA1910061_006_006-2020062909100.690 ppb
2020-06-29CA1910061_003_003-2020062909002.20 ppb
2020-07-06CA1910061_003_003-2020070607402.70 ppb
2020-07-06CA1910061_006_006-2020070607500.650 ppb
2020-07-13CA1910061_006_006-2020071309100.640 ppb
2020-07-13CA1910061_003_003-2020071309002.00 ppb
2020-07-20CA1910061_003_003-2020072009103.00 ppb
2020-07-20CA1910061_006_006-2020072009200.960 ppb
2020-07-27CA1910061_006_006-2020072709100.590 ppb
2020-07-27CA1910061_003_003-2020072709001.90 ppb
2020-08-03CA1910061_003_003-2020080309002.70 ppb
2020-08-03CA1910061_006_006-2020080309100.880 ppb
2020-08-03CA1910061_005_005-202008030920ND
2020-08-10CA1910061_003_003-2020081009502.60 ppb
2020-08-10CA1910061_006_006-2020081010000.900 ppb
2020-08-17CA1910061_006_006-2020081708100.800 ppb
2020-08-17CA1910061_003_003-2020081708002.80 ppb
2020-08-24CA1910061_003_003-2020082409302.70 ppb
2020-08-24CA1910061_006_006-2020082409400.510 ppb
2020-08-31CA1910061_003_003-2020083109401.80 ppb
2020-08-31CA1910061_006_006-2020083109500.610 ppb
2020-09-08CA1910061_003_003-2020090809002.30 ppb
2020-09-08CA1910061_006_006-2020090809100.780 ppb
2020-09-14CA1910061_006_006-2020091409200.810 ppb
2020-09-14CA1910061_003_003-2020091409102.50 ppb
2020-09-21CA1910061_006_006-2020092109450.570 ppb
2020-09-21CA1910061_003_003-2020092109301.90 ppb
2020-09-28CA1910061_006_006-202009280910ND
2020-09-28CA1910061_003_003-2020092809001.50 ppb
2020-10-05CA1910061_006_006-2020100506150.770 ppb
2020-10-05CA1910061_003_003-2020100506002.30 ppb
2020-10-12CA1910061_003_003-2020101208402.40 ppb
2020-10-12CA1910061_006_006-2020101208500.690 ppb
2020-10-19CA1910061_003_003-2020101909002.40 ppb
2020-10-19CA1910061_006_006-2020101909100.800 ppb
2020-10-26CA1910061_006_006-2020102608100.780 ppb
2020-10-26CA1910061_003_003-2020102608002.50 ppb
2020-11-02CA1910061_006_006-2020110209100.520 ppb
2020-11-02CA1910061_003_003-2020110209001.60 ppb
2020-11-09CA1910061_003_003-2020110909001.50 ppb
2020-11-09CA1910061_006_006-202011090910ND
2020-11-16CA1910061_006_006-2020111609200.560 ppb
2020-11-16CA1910061_003_003-2020111609001.70 ppb
2020-11-23CA1910061_003_003-2020112309201.60 ppb
2020-11-23CA1910061_006_006-202011230930ND
2020-11-30CA1910061_003_003-2020113009001.60 ppb
2020-11-30CA1910061_006_006-2020113009100.550 ppb
2020-12-07CA1910061_003_003-2020120708002.90 ppb
2020-12-07CA1910061_006_006-2020120708100.960 ppb
2020-12-14CA1910061_003_003-2020121409001.60 ppb
2020-12-14CA1910061_006_006-2020121409100.500 ppb
2020-12-21CA1910061_003_003-2020122108102.10 ppb
2020-12-21CA1910061_006_006-2020122108000.650 ppb
2020-12-28CA1910061_006_006-2020122809400.510 ppb
2020-12-28CA1910061_003_003-2020122809301.80 ppb
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2021-01-04CA1910061_006_006-2021010408300.820 ppb
2021-01-11CA1910061_005_005-202101110920ND
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2021-01-18CA1910061_006_006-202101180810ND
2021-01-25CA1910061_006_006-202101250910ND
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2021-03-01CA1910061_006_006-202103010910ND
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2021-05-17CA1910061_006_006-202105170545ND
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2021-07-06CA1910061_006_006-202107060730ND
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2022-06-06CA1910061_003_003-2022060607589.30 ppb
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2022-07-05CA1910061_003_003-2022070509006.90 ppb
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2022-09-26CA1910061_003_003-2022092608123.30 ppb
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