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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

City of Gilroy

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.

 

38

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND90ND
2013N/A00N/A
20140.703 ppb990.330 ppb - 1.10 ppb
20150.550 ppb2010ND - 1.80 ppb
2016N/A00N/A
2017N/A00N/A

ppb = parts per billion

State and national drinking water standards and health guidelines

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
2012-05-215810-006-1315ND
2012-05-215810-004-1045ND
2012-05-215810-002-1135ND
2012-05-215810-001-0850ND
2012-05-225810-009-1035ND
2012-05-225810-008-0955ND
2012-05-225810-007-0745ND
2012-05-225810-010-1115ND
2012-05-225810-011-0835ND
2014-01-14A3L2052-17A0.780 ppb
2014-01-14A3L2052-15A1.10 ppb
2014-01-14A3L2052-03A0.590 ppb
2014-01-14A3L2052-07A0.690 ppb
2014-01-14A3L2052-05A0.490 ppb
2014-03-24A4C1501-01A0.770 ppb
2014-05-27A4C1893-01A0.330 ppb
2014-08-04A4G2633-01A0.690 ppb
2014-09-16A4I0774-01A0.890 ppb
2015-04-22A5D1761-03A0.470 ppb
2015-04-22A5D1761-02AND
2015-04-22A5D1760-05A0.920 ppb
2015-04-22A5D1760-01A1.60 ppb
2015-04-22A5D1761-01A0.720 ppb
2015-04-22A5D1760-03A1.20 ppb
2015-04-22A5D1761-05A1.10 ppb
2015-04-22A5D1761-07A1.20 ppb
2015-05-205810-010-0810ND
2015-05-205810-006-0945ND
2015-05-205810-008-1025ND
2015-05-205810-009-1100ND
2015-05-205810-007-1300ND
2015-05-215810-002-1010ND
2015-05-215810-004-1250ND
2015-05-215810-011-0955ND
2015-05-215810-001-0800ND
2015-08-19A5G2521-01A1.80 ppb
2015-08-19A5G2521-05A0.780 ppb
2015-08-19A5G2521-03A1.20 ppb