EWG's Tap Water Database — 2019 UPDATE


Chromium (hexavalent)

City of Manteca

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).





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20131.55 ppb30300.0430 ppb - 4.50 ppb
20142.59 ppb1715ND - 4.40 ppb
20152.20 ppb221.20 ppb - 3.20 ppb
20162.40 ppb32ND - 3.80 ppb

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
2013-05-14A3E1304-04A0.0600 ppb
2013-05-14A3E1304-01A0.0470 ppb
2013-05-22A3E1910-05A1.60 ppb
2013-05-22A3E1910-01A1.50 ppb
2013-05-22A3E1910-22A1.50 ppb
2013-05-22A3E1910-24A2.80 ppb
2013-05-22A3E1910-26A3.70 ppb
2013-05-22A3E1910-03A4.50 ppb
2013-05-22A3E1910-08A2.40 ppb
2013-05-22A3E1910-17A1.80 ppb
2013-05-22A3E1910-12A1.50 ppb
2013-05-22A3E1910-19A0.0970 ppb
2013-05-22A3E1910-15A1.60 ppb
2013-05-22A3E1910-10A0.650 ppb
2013-08-14A3H0730-01A0.0550 ppb
2013-08-14A3H0730-04A0.0780 ppb
2013-11-18A3J2218-15A1.40 ppb
2013-11-19A3J2218-21A3.80 ppb
2013-11-19A3J2218-17A3.70 ppb
2013-11-19A3J2218-23A2.30 ppb
2013-11-19A3J2230-03A0.0700 ppb
2013-11-19A3J2218-05A0.0430 ppb
2013-11-19A3J2218-19A1.50 ppb
2013-11-19A3J2218-01A3.30 ppb
2013-11-19A3J2230-01A0.0500 ppb
2013-11-19A3J2218-07A1.20 ppb
2013-11-19A3J2218-09A1.50 ppb
2013-11-19A3J2218-03A2.10 ppb
2013-11-19A3J2218-13A0.0800 ppb
2013-11-19A3J2218-11A1.60 ppb
2014-02-26A4B0701-03A1.60 ppb
2014-04-23A4D1242-01A0.0530 ppb
2014-12-095810-028-06452.30 ppb
2014-12-095810-012-07503.90 ppb
2014-12-095810-013-05302.30 ppb
2014-12-095810-015-09202.60 ppb
2014-12-095810-030-07004.20 ppb
2014-12-095810-032-05454.40 ppb
2014-12-095810-034-07254.00 ppb
2014-12-095810-036-08372.70 ppb
2014-12-095810-038-05562.70 ppb
2014-12-095810-040-08403.70 ppb
2014-12-095810-042-07454.00 ppb
2014-12-095810-049-07303.90 ppb
2014-12-165810-044-08051.60 ppb
2015-07-215810-034-08121.20 ppb
2015-12-095810-036-08403.20 ppb
2016-04-195810-012-09203.80 ppb
2016-07-125810-032-06303.40 ppb