Know Your Environment. Protect Your Health.

Chromium (total)

Regional Water Authority

Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.

 

131

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND250ND
20190.0800 ppb252ND - 1.000 ppb
20200.0417 ppb241ND - 1.000 ppb
20210.0357 ppb281ND - 1.000 ppb
20220.200 ppb153ND - 1.000 ppb
20230.214 ppb142ND - 2.00 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EPA Maximum Contaminant
Level (MCL): 100 ppb

The legal limit for total chromium, established in 1991, was based on a 1958 toxicity study in laboratory animals, and applies to both the less-toxic trivalent chromium and the more-toxic hexavalent chromium forms of this compound. This limit does not protect against the risk of cancer from ingestion of hexavalent chromium.

ppb = parts per billion

All test results

Date Lab ID Result
2018-03-12IOC1 200489766ND
2018-03-12IOCR 200489760ND
2018-03-12IOCR 200489758ND
2018-03-12IOCR 200489759ND
2018-03-12IOCR 200489767ND
2018-03-14IOCR 200489911ND
2018-03-14IOC1 200489867ND
2018-03-14IOC1 200489870ND
2018-03-14IOC1 200489868ND
2018-03-14IOC1 200489884ND
2018-03-14IOC1 200489885ND
2018-03-14IOC1 200489871ND
2018-03-14IOC1 200489913ND
2018-03-14IOC1 200489914ND
2018-03-14IOCR 200489898ND
2018-03-14IOCR 200489900ND
2018-03-14IOCR 200489896ND
2018-03-14IOCR 200489912ND
2018-03-14IOCR 200489886ND
2018-03-14IOCR 200489887ND
2018-03-14IOCR 200489872ND
2018-03-14IOCR 200489897ND
2018-03-15IOCR 200490063ND
2018-11-29IOC1 200514112ND
2018-11-29IOCR 200514114ND
2019-03-18IOC1 200524895ND
2019-03-18IOCR 200524903ND
2019-03-18IOCR 200524901ND
2019-03-18IOCR 2005249021.000 ppb
2019-03-18IOCR 200524905ND
2019-03-18IOCR 200524900ND
2019-03-19IOCR 200525095ND
2019-03-19IOC1 200525057ND
2019-03-19IOC1 200525060ND
2019-03-19IOC1 200525058ND
2019-03-19IOC1 200525059ND
2019-03-19IOC1 200525077ND
2019-03-19IOC1 200525078ND
2019-03-19IOC1 200525061ND
2019-03-19IOC1 200525097ND
2019-03-19IOC1 200525098ND
2019-03-19IOCR 200525065ND
2019-03-19IOCR 2005250661.000 ppb
2019-03-19IOCR 200525064ND
2019-03-19IOCR 200525096ND
2019-03-19IOCR 200525079ND
2019-03-19IOCR 200525080ND
2019-03-19IOCR 200525062ND
2019-05-08IOC1 200531297ND
2019-05-08IOCR 200531303ND
2020-02-10IOC1 200565460ND
2020-02-10IOCR 200565469ND
2020-02-10IOCR 200565466ND
2020-02-10IOCR 200565467ND
2020-02-10IOCR 200565470ND
2020-02-11IOC1 2005656241.000 ppb
2020-02-11IOC1 200565627ND
2020-02-11IOC1 200565626ND
2020-02-11IOC1 200565593ND
2020-02-11IOC1 200565625ND
2020-02-11IOC1 200565594ND
2020-02-11IOC1 200565628AND
2020-02-11IOCR 200565632ND
2020-02-11IOCR 200565633ND
2020-02-11IOCR 200565631ND
2020-02-11IOC1 200565628ND
2020-02-11IOCR 200565595ND
2020-02-11IOCR 200565596ND
2020-02-11IOCR 200565629ND
2020-02-12IOCR 200565847ND
2020-02-12IOCR 200565848ND
2020-08-10IOCR 200585597ND
2020-08-11IOCR 200585735ND
2020-08-11IOCR 200585736ND
2021-02-08IOCR 200605854ND
2021-02-08IOCR 200605856ND
2021-02-08IOCR 200605852ND
2021-02-08IOCR 200605855ND
2021-02-09IOC1 2006061141.000 ppb
2021-02-09IOC1 200606111ND
2021-02-09IOC1 200606110ND
2021-02-09IOC1 200606109ND
2021-02-09IOC1 200605956ND
2021-02-09IOC1 200605886ND
2021-02-09IOC1 200605888ND
2021-02-09IOC1 200606116ND
2021-02-09IOC1 200605959ND
2021-02-09IOC1 200605933ND
2021-02-09IOCR 200606115ND
2021-02-09IOCR 200606112ND
2021-02-09IOCR 200606113ND
2021-02-09IOCR 200605957ND
2021-02-09IOCR 200605958ND
2021-02-09IOCR 200605931ND
2021-02-09IOCR 200605887ND
2021-02-09IOCR 200605960ND
2021-02-09IOCR 200605889ND
2021-02-09IOCR 200606117ND
2021-02-10IOCR 200606359ND
2021-02-10IOCR 200606356ND
2021-02-17IOCR 200606910ND
2021-02-17IOC1 200606909ND
2022-02-15E300145541 3001455451.000 ppb
2022-02-15E300145532 300145536ND
2022-02-15E300145523 300145527ND
2022-02-15E300145514 3001455181.000 ppb
2022-02-15E300146276 3001462801.000 ppb
2022-02-15E300145647 300145651ND
2022-02-15E300145667 300145671ND
2022-02-15E300145550 300145554ND
2022-02-15E300145575 300145579ND
2022-02-15E300145699 300145703ND
2022-02-15E300145718 300145722ND
2022-02-15I300145657 300145662ND
2022-02-15I300145585 300145590ND
2022-02-15I300145677 300145682ND
2022-02-15I300145560 300145565ND
2023-02-06E300305466 3003054961.000 ppb
2023-02-07E300305797 300305801ND
2023-02-07I300305807 300305812ND
2023-02-14E300309461 3003094652.00 ppb
2023-02-14E300309762 300309766ND
2023-02-14E300309452 300309456ND
2023-02-14E300309097 300309101ND
2023-02-14E300309470 300309474ND
2023-02-14E300309495 300309499ND
2023-02-14E300309531 300309535ND
2023-02-14E300309550 300309554ND
2023-02-14I300309505 300309510ND
2023-02-14I300309107 300309112ND
2023-02-14I300309480 300309485ND