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EWG's Tap Water Database — 2021 UPDATE

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Chromium (hexavalent)

California Water Service - Stockton

Chromium (hexavalent) is a carcinogen that commonly contaminates American drinking water. Chromium (hexavalent) in drinking water may be due to industrial pollution or natural occurrences in mineral deposits and groundwater. Read more about chromium (hexavalent).

MORE ABOUT THIS CONTAMINANT

 

72

Samples

0

Samples exceeding legal limit (MCL)

52

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.03 ppb5440ND - 7.00 ppb
20151.71 ppb118ND - 5.30 ppb
2016ND10ND
20172.87 ppb64ND - 7.90 ppb
2018N/A00N/A
2019N/A00N/A

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.02 ppb

The EWG Health Guideline of 0.02 ppb for chromium (hexavalent) 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.

ppb = parts per billion

All test results

Date Lab ID Result
2014-01-09201401100155AM1.40 ppb
2014-01-09201401100146AM0.0300 ppb
2014-01-09201401100108AMND
2014-01-09201401100114AM0.990 ppb
2014-01-14201401150484AM0.1000 ppb
2014-01-14201401150352AM0.0360 ppb
2014-01-14201401150371AM1.50 ppb
2014-01-14201401150647AM0.0710 ppb
2014-01-14201401150320AM0.780 ppb
2014-01-14201401150330AM0.0450 ppb
2014-01-16201401170405AM2.00 ppb
2014-01-16201401170450AM0.0480 ppb
2014-01-16201401170463AM2.50 ppb
2014-01-22201401230165AM1.20 ppb
2014-04-21201404220359AM0.0320 ppb
2014-04-21201404220223AM0.0490 ppb
2014-04-21201404220288AM0.0390 ppb
2014-04-21201404220218AM0.0930 ppb
2014-07-07201407090854AM0.740 ppb
2014-07-08201407090751AM1.20 ppb
2014-07-08201407090777AM0.0370 ppb
2014-07-08201407090757AM0.300 ppb
2014-07-08201407090788AM2.40 ppb
2014-07-08201407090768AM0.0420 ppb
2014-07-08201407090707AM0.720 ppb
2014-07-14201407150354AM4.90 ppb
2014-07-14201407150429AM2.30 ppb
2014-07-15201407160581AM0.110 ppb
2014-07-15201407160592AM0.0330 ppb
2014-07-15201407160564AM2.40 ppb
2014-07-23201407240449AM0.540 ppb
2014-08-069590-028-1433ND
2014-08-069590-130-14201.20 ppb
2014-08-069590-132-09452.30 ppb
2014-08-069590-015-1128ND
2014-08-069590-045-1446ND
2014-08-069590-013-11062.40 ppb
2014-08-069590-007-10432.50 ppb
2014-09-111610-055-1530ND
2014-09-111610-050-1256ND
2014-09-111610-052-0918ND
2014-09-111610-056-1236ND
2014-09-111610-053-1110ND
2014-10-08201410090299AMND
2014-10-08201410090373AMND
2014-10-08201410090336AMND
2014-10-08201410090327AM0.730 ppb
2014-10-091610-062-10313.90 ppb
2014-10-091610-058-10571.80 ppb
2014-10-091610-063-09002.50 ppb
2014-10-091610-064-0955ND
2014-10-091610-065-09374.70 ppb
2014-11-061610-067-11237.00 ppb
2014-12-041610-029-0828ND
2015-01-07201501080581AM0.0350 ppb
2015-01-08201501090539AM1.10 ppb
2015-01-225810-054-1306ND
2015-03-119590-018-13005.30 ppb
2015-04-089590-051-12201.40 ppb
2015-06-03201506040495AM0.860 ppb
2015-08-161610-133-19003.60 ppb
2015-09-16201509170572AM1.40 ppb
2015-10-155810-060-1250ND
2015-11-195810-059-1016ND
2015-12-095810-018-05275.10 ppb
2016-02-235810-061-1155ND
2017-08-011610-064-1122ND
2017-08-081610-063-11324.60 ppb
2017-08-081610-132-14453.40 ppb
2017-08-081610-029-1510ND
2017-08-081610-028-14201.30 ppb
2017-10-161610-067-10407.90 ppb