Know Your Environment. Protect Your Health.

Perchlorate

Gleanings For The Hungry

Perchlorate, a component of rocket fuel, occurs both naturally and as a synthetic chemical. Ingested perchlorate interferes with thyroid function. Exposure to perchlorate during pregnancy and childhood can impair cognitive development. Read More.

According to the EPA, perchlorate likely contaminates the water of more than 16 million Americans. Perchlorate interferes with iodine uptake in the thyroid, which can result in reduced thyroid hormones and an impact on metabolism, physical development and cognitive development. Children and developing fetuses are the most at risk from perchlorate contamination.

Perchlorate is the only unregulated contaminant for which the EPA has attempted to set a federal drinking water standard since 1996. However, the agency has yet to propose a draft limit for this contaminant. Perchlorate in drinking water is regulated in Arizona, California, Massachusetts, New Jersey, New York and Texas. California set a public health goal of 1 part per billion for perchlorate in 2015.

Click here to read more about perchlorate.

 

234

Samples

0

Samples exceeding legal limit (MCL)

72

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20183.43 ppb3412ND - 11.0 ppb
20193.87 ppb3112ND - 12.0 ppb
20203.66 ppb3211ND - 14.0 ppb
20212.89 ppb4812ND - 22.0 ppb
20222.87 ppb4915ND - 12.0 ppb
20232.20 ppb4011ND - 12.0 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 1 ppb

The EWG Health Guideline of 1 ppb for perchlorate 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 hormone disruption.

ppb = parts per billion

All test results

Date Lab ID Result
2018-01-18CA5402047_018_018-20180118110011.0 ppb
2018-01-18CA5402047_021_021-201801181105ND
2018-01-18CA5402047_017_017-201801181050ND
2018-02-08CA5402047_018_018-2018020814307.10 ppb
2018-02-08CA5402047_021_021-201802081435ND
2018-03-20CA5402047_018_018-20180320115011.0 ppb
2018-03-20CA5402047_021_021-201803201350ND
2018-03-20CA5402047_017_017-201803201110ND
2018-04-24CA5402047_017_017-201804241230ND
2018-04-24CA5402047_018_018-20180424133511.0 ppb
2018-04-24CA5402047_021_021-201804241340ND
2018-05-11CA5402047_018_018-20180511080010.00 ppb
2018-05-11CA5402047_017_017-201805110750ND
2018-05-11CA5402047_021_021-201805110930ND
2018-06-22CA5402047_018_018-2018062214009.70 ppb
2018-06-22CA5402047_021_021-201806221405ND
2018-07-04CA5402047_021_021-201807041039ND
2018-07-04CA5402047_018_018-2018070410169.10 ppb
2018-07-04CA5402047_017_017-201807041010ND
2018-08-09CA5402047_018_018-2018080911138.00 ppb
2018-08-09CA5402047_021_021-201808091127ND
2018-08-09CA5402047_017_017-201808091102ND
2018-09-20CA5402047_017_017-201809201015ND
2018-09-20CA5402047_021_021-201809201025ND
2018-09-20CA5402047_018_018-20180920102011.0 ppb
2018-10-09CA5402047_021_021-201810091343ND
2018-10-09CA5402047_018_018-2018100913369.80 ppb
2018-10-09CA5402047_017_017-201810091329ND
2018-11-05CA5402047_018_018-2018110513279.60 ppb
2018-11-05CA5402047_021_021-201811051459ND
2018-11-05CA5402047_017_017-201811051339ND
2018-12-05CA5402047_017_017-201812051046ND
2018-12-05CA5402047_018_018-2018120510379.40 ppb
2018-12-05CA5402047_021_021-201812051053ND
2019-01-08CA5402047_017_017-201901080950ND
2019-01-08CA5402047_018_018-20190108094511.0 ppb
2019-01-08CA5402047_021_021-201901081000ND
2019-02-05CA5402047_017_017-201902051334ND
2019-02-05CA5402047_018_018-20190205132010.00 ppb
2019-03-11CA5402047_018_018-20190311133511.0 ppb
2019-03-11CA5402047_017_017-201903111342ND
2019-03-11CA5402047_021_021-201903111347ND
2019-04-11CA5402047_017_017-201904111145ND
2019-04-11CA5402047_018_018-2019041111508.70 ppb
2019-04-11CA5402047_021_021-201904111200ND
2019-05-08CA5402047_017_017-201905081605ND
2019-05-08CA5402047_018_018-20190508161010.00 ppb
2019-06-11CA5402047_017_017-201906111430ND
2019-06-11CA5402047_018_018-20190611140011.0 ppb
2019-07-12CA5402047_017_017-201907121010ND
2019-07-12CA5402047_018_018-20190712101510.00 ppb
2019-07-12CA5402047_021_021-201907121020ND
2019-08-19CA5402047_021_021-201908191345ND
2019-08-19CA5402047_017_017-201908191335ND
2019-08-19CA5402047_018_018-20190819134010.00 ppb
2019-09-26CA5402047_017_017-201909261044ND
2019-09-26CA5402047_021_021-201909261100ND
2019-09-26CA5402047_018_018-2019092610508.90 ppb
2019-10-31CA5402047_017_017-201910311145ND
2019-10-31CA5402047_018_018-20191031115012.0 ppb
2019-10-31CA5402047_021_021-201910311305ND
2019-11-27CA5402047_017_017-201911271440ND
2019-11-27CA5402047_018_018-2019112714458.90 ppb
2019-12-19CA5402047_017_017-201912191500ND
2019-12-19CA5402047_018_018-2019121915108.50 ppb
2020-01-29CA5402047_017_017-202001291020ND
2020-01-29CA5402047_018_018-2020012910307.30 ppb
2020-03-23CA5402047_017_017-202003231120ND
2020-03-23CA5402047_018_018-2020032311308.90 ppb
2020-04-15CA5402047_017_017-202004151030ND
2020-04-15CA5402047_018_018-20200415104011.0 ppb
2020-05-15CA5402047_018_018-20200515082011.0 ppb
2020-05-15CA5402047_022_022-202005150935ND
2020-05-15CA5402047_017_017-202005150815ND
2020-05-22CA5402047_022_022-202005221445ND
2020-06-15CA5402047_017_017-202006151455ND
2020-06-15CA5402047_018_018-2020061515009.20 ppb
2020-06-15CA5402047_022_022-202006151510ND
2020-07-15CA5402047_017_017-202007151400ND
2020-07-15CA5402047_022_022-202007151415ND
2020-07-15CA5402047_018_018-20200715140514.0 ppb
2020-08-05CA5402047_017_017-202008051330ND
2020-08-05CA5402047_018_018-20200805134013.0 ppb
2020-08-05CA5402047_022_022-202008051350ND
2020-09-22CA5402047_018_018-20200922102012.0 ppb
2020-09-22CA5402047_022_022-202009221035ND
2020-09-22CA5402047_017_017-202009221015ND
2020-10-19CA5402047_022_022-202010191420ND
2020-10-19CA5402047_017_017-202010191400ND
2020-10-19CA5402047_018_018-20201019140511.0 ppb
2020-11-10CA5402047_018_018-2020111013359.80 ppb
2020-11-10CA5402047_021_021-202011101345ND
2020-11-10CA5402047_017_017-202011101330ND
2020-11-10CA5402047_022_022-202011101340ND
2020-12-17CA5402047_018_018-20201217142510.00 ppb
2020-12-17CA5402047_017_017-202012171420ND
2020-12-17CA5402047_022_022-202012171435ND
2021-01-19CA5402047_017_017-202101191330ND
2021-01-19CA5402047_021_021-202101191340ND
2021-01-19CA5402047_018_018-2021011913359.50 ppb
2021-01-19CA5402047_022_022-202101191345ND
2021-02-17CA5402047_021_021-202102171600ND
2021-02-17CA5402047_022_022-202102171605ND
2021-02-17CA5402047_017_017-202102171550ND
2021-02-17CA5402047_018_018-20210217155511.0 ppb
2021-03-16CA5402047_017_017-202103161300ND
2021-03-16CA5402047_018_018-20210316130510.00 ppb
2021-03-16CA5402047_021_021-202103161310ND
2021-03-16CA5402047_022_022-202103161315ND
2021-04-21CA5402047_018_018-202104211405ND
2021-04-21CA5402047_021_021-202104211410ND
2021-04-21CA5402047_022_022-202104211415ND
2021-04-21CA5402047_017_017-202104211400ND
2021-05-07CA5402047_017_017-202105071330ND
2021-05-07CA5402047_018_018-20210507133511.0 ppb
2021-05-07CA5402047_022_022-202105071340ND
2021-05-07CA5402047_021_021-202105071345ND
2021-06-24CA5402047_017_017-202106241425ND
2021-06-24CA5402047_022_022-20210624144022.0 ppb
2021-06-24CA5402047_018_018-20210624143012.0 ppb
2021-06-24CA5402047_021_021-202106241435ND
2021-07-21CA5402047_018_018-20210721140510.00 ppb
2021-07-21CA5402047_021_021-202107211410ND
2021-07-21CA5402047_022_022-202107211415ND
2021-07-21CA5402047_017_017-202107211400ND
2021-08-30CA5402047_017_017-202108301130ND
2021-08-30CA5402047_021_021-202108301140ND
2021-08-30CA5402047_018_018-2021083011359.60 ppb
2021-08-30CA5402047_022_022-202108301145ND
2021-09-20CA5402047_017_017-202109201510ND
2021-09-20CA5402047_021_021-202109201500ND
2021-09-20CA5402047_022_022-202109201455ND
2021-09-20CA5402047_018_018-2021092015159.50 ppb
2021-10-27CA5402047_018_018-2021102711359.90 ppb
2021-10-27CA5402047_022_022-202110271145ND
2021-10-27CA5402047_017_017-202110271130ND
2021-10-27CA5402047_021_021-202110271140ND
2021-11-10CA5402047_018_018-20211110140512.0 ppb
2021-11-10CA5402047_017_017-202111101400ND
2021-11-10CA5402047_021_021-202111101410ND
2021-11-10CA5402047_022_022-202111101415ND
2021-12-23CA5402047_017_017-202112230900ND
2021-12-23CA5402047_021_021-202112230915ND
2021-12-23CA5402047_022_022-202112230910ND
2021-12-23CA5402047_018_018-20211223090512.0 ppb
2022-01-25CA5402047_017_017-202201251400ND
2022-01-25CA5402047_018_018-20220125140512.0 ppb
2022-01-25CA5402047_021_021-202201251410ND
2022-01-25CA5402047_022_022-202201251415ND
2022-02-23CA5402047_022_022-202202231430ND
2022-02-23CA5402047_017_017-202202231400ND
2022-02-23CA5402047_018_018-2022022314108.60 ppb
2022-02-23CA5402047_021_021-202202231440ND
2022-03-17CA5402047_021_021-202203171020ND
2022-03-17CA5402047_022_022-202203171010ND
2022-03-17CA5402047_018_018-20220317100511.0 ppb
2022-03-17CA5402047_017_017-202203171000ND
2022-04-12CA5402047_021_021-202204121410ND
2022-04-12CA5402047_022_022-202204121415ND
2022-04-12CA5402047_018_018-20220412140511.0 ppb
2022-04-12CA5402047_017_017-202204121400ND
2022-05-27CA5402047_018_018-20220527130511.0 ppb
2022-05-27CA5402047_017_017-202205271300ND
2022-05-27CA5402047_022_022-202205271315ND
2022-05-27CA5402047_021_021-202205271310ND
2022-06-29CA5402047_018_018-20220629094511.0 ppb
2022-06-29CA5402047_017_017-202206290940ND
2022-06-29CA5402047_022_022-202206290955ND
2022-06-29CA5402047_021_021-202206290950ND
2022-07-25CA5402047_018_018-20220725133512.0 ppb
2022-07-25CA5402047_021_021-202207251340ND
2022-07-25CA5402047_022_022-202207251345ND
2022-07-25CA5402047_017_017-202207251330ND
2022-08-23CA5402047_018_018-20220823130510.00 ppb
2022-08-23CA5402047_021_021-202208231315ND
2022-08-23CA5402047_017_017-202208231300ND
2022-08-23CA5402047_022_022-202208231310ND
2022-09-28CA5402047_017_017-202209281130ND
2022-09-28CA5402047_018_018-20220928113511.0 ppb
2022-09-28CA5402047_021_021-202209281430ND
2022-09-28CA5402047_022_022-2022092815002.20 ppb
2022-10-05CA5402047_022_022-202210051010ND
2022-10-31CA5402047_017_017-202210310700ND
2022-10-31CA5402047_021_021-202210310730ND
2022-10-31CA5402047_022_022-202210310735ND
2022-10-31CA5402047_018_018-20221031070511.0 ppb
2022-11-21CA5402047_022_022-202211211440ND
2022-11-21CA5402047_017_017-2022112114308.50 ppb
2022-11-21CA5402047_018_018-2022112114359.20 ppb
2022-11-21CA5402047_021_021-202211211445ND
2022-12-19CA5402047_018_018-20221219140511.0 ppb
2022-12-19CA5402047_022_022-202212191410ND
2022-12-19CA5402047_017_017-2022121914001.30 ppb
2022-12-19CA5402047_021_021-202212191415ND
2023-01-27CA5402047_017_017-2023012710001.000 ppb
2023-01-27CA5402047_018_018-2023012710059.50 ppb
2023-01-27CA5402047_021_021-202301271010ND
2023-01-27CA5402047_022_022-202301271015ND
2023-02-22CA5402047_018_018-2023022214059.00 ppb
2023-02-22CA5402047_021_021-202302221415ND
2023-02-22CA5402047_022_022-202302221410ND
2023-02-22CA5402047_017_017-202302221400ND
2023-03-31CA5402047_021_021-202303311315ND
2023-03-31CA5402047_017_017-2023033113001.10 ppb
2023-03-31CA5402047_018_018-20230331130512.0 ppb
2023-03-31CA5402047_022_022-202303311310ND
2023-04-24CA5402047_021_021-202304241020ND
2023-04-24CA5402047_022_022-202304241030ND
2023-04-24CA5402047_017_017-202304241000ND
2023-04-24CA5402047_018_018-20230424101010.00 ppb
2023-05-30CA5402047_022_022-202305301055ND
2023-05-30CA5402047_021_021-202305301100ND
2023-05-30CA5402047_017_017-202305301045ND
2023-05-30CA5402047_018_018-2023053010509.40 ppb
2023-06-19CA5402047_017_017-202306191415ND
2023-06-19CA5402047_021_021-202306191430ND
2023-06-19CA5402047_018_018-2023061914209.90 ppb
2023-06-19CA5402047_022_022-202306191425ND
2023-07-27CA5402047_017_017-202307271040ND
2023-07-27CA5402047_022_022-2023072710506.20 ppb
2023-07-27CA5402047_021_021-202307271055ND
2023-07-27CA5402047_018_018-202307271045ND
2023-08-23CA5402047_018_018-20230823140510.00 ppb
2023-08-23CA5402047_021_021-202308231410ND
2023-08-23CA5402047_022_022-202308231415ND
2023-08-23CA5402047_017_017-202308231400ND
2023-09-28CA5402047_021_021-202309281010ND
2023-09-28CA5402047_018_018-20230928100510.00 ppb
2023-09-28CA5402047_017_017-202309281000ND
2023-09-28CA5402047_022_022-202309281015ND
2023-11-27CA5402047_021_021-202311271450ND
2023-11-27CA5402047_022_022-202311271500ND
2023-12-27CA5402047_021_021-202312271305ND
2023-12-27CA5402047_022_022-202312271310ND