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EWG's Tap Water Database — 2021 UPDATE

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Vinyl chloride

Harris County Municipal Utility District 158

NOTE: Harris County Municipal Utility District 158 purchases water from City of Houston which is required to test for vinyl chloride. Sample information shown below was taken by City of Houston.

Vinyl chloride is a known human carcinogen used for production of polyvinyl chloride (PVC) plastics. Discharges from plastics manufacturing can contaminate drinking water with vinyl chloride. Read More.

Exposure to vinyl chloride increases the risk of cancer and can damage the liver and nervous system. The California public health goal of 0.05 parts per billion, set to protect against cancer, is 40 times lower than the amount allowed by the federal government, which is a Maximum Contaminant Level of 2 parts per billion.

Plastic pipes made of polyvinyl chloride (PVC) and chlorinated PVC (CPVC) are widely used for drinking water distribution lines and internal plumbing, raising concern about vinyl chloride contamination of drinking water. A study published in 2011 by Ryan Walter of Cornell University School of Civil and Environmental Engineering suggested that small amounts of vinyl chloride can leach from PVC pipes. Vinyl chloride can also form in the pipes as a result of water disinfection with chlorine.

In an assessment completed in 2000, California Office of Environmental Health Hazard Assessment stated that drinking water is not a significant source of exposure to vinyl chloride for the general population.

Click here to read more about carcinogenic VOCs.

 

226

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.05 ppb

The EWG Health Guideline of 0.05 ppb for vinyl chloride 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) 2 ppb

The legal limit for vinyl chloride, established in 1987, was based on analytical detection limits at the time that the standard was set. This limit may not fully protect against the risk of cancer due to vinyl chloride exposure.

ppb = parts per billion

All test results

NOTE: Harris County Municipal Utility District 158 purchases water from City of Houston which is required to test for vinyl chloride. Sample information shown below was taken by City of Houston.

Date Lab ID Result
2014-04-16AC50842ND
2014-04-16AC50844ND
2014-04-17AC51090ND
2014-04-17AC51078ND
2014-04-17AC51084ND
2014-04-17AC51082ND
2014-06-03AC55801ND
2014-07-15AC59698ND
2014-07-15AC59690ND
2014-07-15AC59692ND
2014-07-15AC59694ND
2014-07-15AC59688ND
2014-07-16AC59835ND
2014-07-16AC59831ND
2014-07-16AC59839ND
2014-07-16AC59849ND
2014-07-16AC59837ND
2014-07-16AC59845ND
2014-10-08AC69209ND
2014-10-09AC69350ND
2014-10-09AC69348ND
2014-12-09AC74196ND
2014-12-09AC74204ND
2014-12-18AC75459ND
2014-12-18AC75455ND
2015-03-04AC82952ND
2015-03-05AC82914ND
2015-03-24AC85888ND
2015-06-04AC94641ND
2015-06-04AC94645ND
2015-06-04AC94639ND
2015-06-04AC94643ND
2015-06-04AC94647ND
2015-07-21AD00437ND
2015-07-21AD00441ND
2015-07-21AD00429ND
2015-07-21AD00435ND
2015-07-21AD00443ND
2015-07-21AD00433ND
2015-07-21AD00405ND
2015-07-21AD00407ND
2015-07-22AD00630ND
2015-07-22AD00628ND
2015-07-22AD00632ND
2015-07-22AD00626ND
2015-07-22AD00624ND
2015-07-22AD00638ND
2015-09-17AD07597ND
2015-09-17AD07599ND
2015-10-22AD11558ND
2015-10-22AD11536ND
2015-10-22AD11542ND
2015-10-22AD11532ND
2015-10-22AD11548ND
2015-10-22AD11550ND
2015-11-12AD13376ND
2015-11-12AD13378ND
2015-11-12AD13382ND
2015-11-12AD13386ND
2015-11-12AD13372ND
2015-11-12AD13380ND
2015-11-12AD13390ND
2015-12-08AD15973ND
2015-12-08AD15967ND
2016-02-18AD24361ND
2016-02-18AD24331ND
2016-02-18AD24299ND
2016-02-18AD24379ND
2016-03-03AD26927ND
2016-03-17AD29381ND
2016-03-17AD29379ND
2016-03-23AD30127ND
2016-03-23AD30131ND
2016-03-23AD30129ND
2016-03-23AD30155ND
2016-06-03AD39456ND
2016-06-08AD39810ND
2016-06-08AD39818ND
2016-06-08AD39806ND
2016-06-08AD39802ND
2016-06-08AD39794ND
2016-06-08AD39808ND
2016-06-16AD41019ND
2016-06-16AD41015ND
2016-06-16AD41013ND
2016-09-20AD50395ND
2016-09-20AD50391ND
2016-09-20AD50373ND
2016-09-20AD50375ND
2016-09-20AD50381ND
2016-09-21AD50831ND
2016-09-21AD50829ND
2016-09-21AD50809ND
2016-09-21AD50825ND
2016-09-22AD50815ND
2016-10-06AD52680ND
2016-10-06AD52682ND
2016-10-06AD52678ND
2016-10-06AD52676ND
2016-10-06AD52674ND
2016-11-18AD58909ND
2016-11-18AD58877ND
2016-11-21AD58875ND
2016-11-21AD58903ND
2016-11-21AD58897ND
2016-11-21AD58879ND
2016-11-21AD58871ND
2017-01-26AD67193ND
2017-01-26AD67205ND
2017-01-26AD67203ND
2017-03-01AD72767ND
2017-03-02AD73096ND
2017-03-02AD73124ND
2017-03-28AD77142ND
2017-03-28AD77184ND
2017-03-28AD77180ND
2017-03-28AD77186ND
2017-03-28AD77178ND
2017-03-29AD77428ND
2017-03-29AD77430ND
2017-03-29AD77444ND
2017-03-29AD77424ND
2017-04-26AD81177ND
2017-04-27AD81524ND
2017-04-27AD81528ND
2017-07-06AD88484ND
2017-07-06AD88482ND
2017-07-25AD90637ND
2017-07-25AD90641ND
2017-07-25AD90639ND
2017-07-26AD90867ND
2017-07-26AD90845ND
2017-08-15AD93122ND
2017-08-15AD93098ND
2017-08-15AD93120ND
2017-08-15AD93104ND
2017-09-11AD95487ND
2017-09-11AD95493ND
2017-09-11AD95485ND
2017-09-26AD98055ND
2017-09-26AD98057ND
2017-11-07AE03895ND
2017-11-07AE03877ND
2017-11-07AE03875ND
2017-11-07AE03897ND
2017-11-07AE03883ND
2017-11-07AE03881ND
2017-11-14AE04773ND
2017-12-04AE06600ND
2017-12-04AE06598ND
2018-01-18AE09269ND
2018-01-18AE09263ND
2018-01-18AE09267ND
2018-01-23AE09888ND
2018-01-23AE09890ND
2018-01-23AE09892ND
2018-01-23AE09882ND
2018-03-29AE20616ND
2018-03-29AE20660ND
2018-03-29AE20620ND
2018-03-29AE20668ND
2018-03-29AE20614ND
2018-03-29AE20626ND
2018-04-26AE24174ND
2018-04-26AE24170ND
2018-04-26AE24160ND
2018-04-26AE24178ND
2018-04-26AE24176ND
2018-04-26AE24184ND
2018-05-22AE27250ND
2018-05-22AE27262ND
2018-05-22AE27246ND
2018-05-22AE27268ND
2018-07-19AE33955ND
2018-07-19AE33951ND
2018-07-19AE33949ND
2018-07-19AE33947ND
2018-07-19AE33953ND
2018-07-19AE33975ND
2018-08-03AE35862ND
2018-08-03AE35866ND
2018-08-15AE37202ND
2018-08-15AE37200ND
2018-08-15AE37218ND
2018-08-15AE37214ND
2018-08-28AE38811ND
2018-09-26AE41760ND
2018-09-26AE41766ND
2018-09-26AE41768ND
2018-09-26AE41758ND
2018-11-14AE46111ND
2019-01-16AE50170ND
2019-03-06AE57367ND
2019-03-06AE57365ND
2019-03-06AE57369ND
2019-03-06AE57359ND
2019-03-06AE57361ND
2019-03-06AE57363ND
2019-04-10AE62068ND
2019-04-11AE62064ND
2019-04-11AE62066ND
2019-06-25AE72013ND
2019-06-25AE72015ND
2019-06-25AE72011ND
2019-07-24AE76001ND
2019-07-24AE75999ND
2019-07-24AE75989ND
2019-07-25AE75991ND
2019-07-25AE75993ND
2019-09-23AE84256ND
2019-09-23AE84250ND
2019-09-23AE84254ND
2019-11-18AE89561ND
2019-11-18AE89557ND
2019-11-18AE89559ND
2019-11-22AE90418ND
2019-11-22AE90420ND
2019-11-22AE90414ND
2019-11-22AE90412ND
2019-12-02AE90836ND
2019-12-02AE90844ND
2019-12-02AE90842ND
2019-12-02AE90838ND
2019-12-02AE90840ND
2019-12-02AE90846ND
2019-12-02AE90834ND