Know Your Environment. Protect Your Health.

Tetrachloroethylene (perchloroethylene)

Hillview Water Company-oakhurst/sierra Lakes

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.

 

91

Samples

1

Samples exceeding legal limit (MCL)

17

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.622 ppb234ND - 8.20 ppb
20190.144 ppb152ND - 1.20 ppb
20200.233 ppb122ND - 1.80 ppb
20210.515 ppb134ND - 3.30 ppb
20220.500 ppb194ND - 3.70 ppb
20230.178 ppb91ND - 1.60 ppb

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
2018-01-02CA2010007_017_017-2018010216118.20 ppb
2018-01-02CA2010007_028_028-201801021622ND
2018-04-03CA2010007_017_017-2018040315102.30 ppb
2018-04-03CA2010007_028_028-201804031523ND
2018-04-30CA2010007_048_048-201804301432ND
2018-04-30CA2010007_047_047-201804301410ND
2018-04-30CA2010007_046_046-201804301410ND
2018-05-23CA2010007_024_024-201805231020ND
2018-05-25CA2010007_046_046-201805251000ND
2018-05-25CA2010007_046_046-201805250932ND
2018-07-10CA2010007_024_024-201807101515ND
2018-07-10CA2010007_017_017-2018071016002.30 ppb
2018-07-10CA2010007_046_046-201807101325ND
2018-07-10CA2010007_048_048-201807101418ND
2018-07-10CA2010007_047_047-201807101445ND
2018-07-25CA2010007_009_009-201807251000ND
2018-07-31CA2010007_028_028-201807311023ND
2018-08-22CA2010007_010_010-201808221022ND
2018-10-09CA2010007_017_017-2018100913101.50 ppb
2018-10-09CA2010007_028_028-201810091323ND
2018-10-10CA2010007_046_046-201810100925ND
2018-10-10CA2010007_047_047-201810101002ND
2018-10-10CA2010007_048_048-201810101041ND
2019-01-08CA2010007_047_047-201901081315ND
2019-01-08CA2010007_046_046-201901081140ND
2019-01-10CA2010007_017_017-2019011009351.20 ppb
2019-01-10CA2010007_028_028-201901100950ND
2019-02-13CA2010007_048_048-201902130910ND
2019-04-10CA2010007_017_017-2019041010090.960 ppb
2019-09-12CA2010007_032_032-201909120832ND
2019-10-29CA2010007_001_001-201910290852ND
2019-10-29CA2010007_032_032-201910290925ND
2019-10-29CA2010007_003_003-201910290903ND
2019-12-23CA2010007_033_033-201912230916ND
2019-12-23CA2010007_034_034-201912230831ND
2019-12-30CA2010007_030_030-201912300837ND
2019-12-30CA2010007_031_031-201912300844ND
2019-12-30CA2010007_007_007-201912300849ND
2020-01-20CA2010007_017_017-2020012010081.000 ppb
2020-02-10CA2010007_048_048-202002100920ND
2020-04-07CA2010007_017_017-2020040709351.80 ppb
2020-06-16CA2010007_002_002-202006160830ND
2020-06-16CA2010007_047_047-202006160805ND
2020-06-16CA2010007_046_046-202006160752ND
2020-08-20CA2010007_047_047-202008201025ND
2020-08-20CA2010007_046_046-202008201005ND
2020-08-20CA2010007_041_041-202008201218ND
2020-08-20CA2010007_039_039-202008200908ND
2020-08-20CA2010007_048_048-202008200950ND
2020-09-14CA2010007_002_002-202009141220ND
2021-02-17CA2010007_040_040-202102171057ND
2021-08-11CA2010007_024_024-202108110908ND
2021-08-16CA2010007_048_048-202108161008ND
2021-08-16CA2010007_010_010-202108160908ND
2021-08-16CA2010007_046_046-202108160908ND
2021-08-16CA2010007_047_047-202108161008ND
2021-08-16CA2010007_009_009-202108160908ND
2021-08-25CA2010007_017_017-2021082511080.800 ppb
2021-08-31CA2010007_028_028-2021083111081.90 ppb
2021-09-10CA2010007_017_017-2021091013093.30 ppb
2021-09-10CA2010007_028_028-202109101309ND
2021-09-24CA2010007_028_028-202109241209ND
2021-11-16CA2010007_017_017-2021111608400.700 ppb
2022-02-07CA2010007_017_017-2022020710120.800 ppb
2022-03-30CA2010007_040_040-202203300948ND
2022-05-11CA2010007_017_017-2022051109403.10 ppb
2022-05-18CA2010007_040_040-202205180950ND
2022-06-06CA2010007_007_007-202206061112ND
2022-06-06CA2010007_034_034-202206061124ND
2022-06-06CA2010007_033_033-202206061214ND
2022-06-06CA2010007_030_030-202206061142ND
2022-06-06CA2010007_031_031-202206061134ND
2022-06-06CA2010007_032_032-202206061202ND
2022-06-07CA2010007_048_048-202206070942ND
2022-06-07CA2010007_001_001-202206070818ND
2022-06-07CA2010007_047_047-202206070932ND
2022-06-07CA2010007_003_003-202206070833ND
2022-06-07CA2010007_046_046-202206070922ND
2022-08-17CA2010007_040_040-202208170845ND
2022-08-17CA2010007_017_017-2022081708163.70 ppb
2022-11-02CA2010007_017_017-2022110208411.90 ppb
2022-11-02CA2010007_040_040-202211021206ND
2023-02-01CA2010007_017_017-202302011336ND
2023-02-01CA2010007_040_040-2023020108301.60 ppb
2023-06-05CA2010007_041_041-202306051012ND
2023-06-06CA2010007_002_002-202306060822ND
2023-06-06CA2010007_051_051-202306060820ND
2023-06-06CA2010007_013_013-202306061000ND
2023-06-20CA2010007_039_039-202306200852ND
2023-07-12CA2010007_028_028-202307120905ND
2023-07-19CA2010007_046_046-202307190909ND