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EWG's Tap Water Database — 2021 UPDATE

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Chromium (hexavalent)

Cal-water Service Company - Chico

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

 

136

Samples

0

Samples exceeding legal limit (MCL)

118

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20131.70 ppb27270.510 ppb - 7.30 ppb
20141.99 ppb10486ND - 7.20 ppb
20153.39 ppb220.570 ppb - 6.20 ppb
2016N/A00N/A
20173.00 ppb113.00 ppb
20183.20 ppb113.20 ppb
20193.40 ppb113.40 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
2013-07-08201307090264AM4.40 ppb
2013-07-09201307100959AM1.30 ppb
2013-07-10201307110728AM1.40 ppb
2013-07-10201307110719AM0.710 ppb
2013-07-23201307240450AM7.30 ppb
2013-07-24201307250294AM3.20 ppb
2013-08-05201308060205AM0.670 ppb
2013-08-05201308060170AM1.30 ppb
2013-08-07201308080252AM0.930 ppb
2013-08-07201308080293AM1.10 ppb
2013-08-14201308150415AM1.60 ppb
2013-08-14201308150372AM0.650 ppb
2013-08-14201308150515AM0.560 ppb
2013-08-20201308210541AM1.000 ppb
2013-08-20201308210527AM0.510 ppb
2013-08-21201308220196AM1.50 ppb
2013-08-21201308220224AM0.900 ppb
2013-08-27201308290349AM5.10 ppb
2013-09-17201309180766AM4.00 ppb
2013-09-17201309180756AM0.900 ppb
2013-09-17201309180523AM1.000 ppb
2013-09-18201309200062AM1.60 ppb
2013-10-08201310090471AM0.820 ppb
2013-10-08201310090668AM0.830 ppb
2013-10-08201310090480AM1.20 ppb
2013-10-15201310160272AM0.680 ppb
2013-10-15201310160230AM0.770 ppb
2014-01-07201401080517AM5.90 ppb
2014-01-07201401080498AM3.10 ppb
2014-01-08201401090451AM4.10 ppb
2014-01-14201401150436AM6.20 ppb
2014-01-14201401150419AM7.20 ppb
2014-01-21201401220306AM1.30 ppb
2014-01-22201401230434AM0.830 ppb
2014-01-22201401230386AM0.800 ppb
2014-01-28201401290599AM0.650 ppb
2014-02-11201402120761AM0.940 ppb
2014-02-11201402120779AM0.670 ppb
2014-02-11201402120801AM0.890 ppb
2014-02-11201402120796AM0.860 ppb
2014-02-11201402120770AM1.10 ppb
2014-02-12201402130427AM1.50 ppb
2014-02-12201402130418AM1.20 ppb
2014-02-12201402130408AM0.540 ppb
2014-02-19201402200379AM0.730 ppb
2014-02-26201402270249AM1.50 ppb
2014-02-26201402270198AM0.500 ppb
2014-02-28201403010100AM2.50 ppb
2014-03-04201403050607AM1.40 ppb
2014-03-04201403050444AM1.20 ppb
2014-03-04201403050465AM0.540 ppb
2014-03-04201403050733AM0.810 ppb
2014-03-05201403060274AM4.40 ppb
2014-03-17201403180363AM6.90 ppb
2014-03-17201403180220AM5.00 ppb
2014-03-17201403180312AM5.70 ppb
2014-03-18201403190838AM4.70 ppb
2014-03-18201403190853AM6.00 ppb
2014-04-08201404090696AM0.820 ppb
2014-04-08201404090706AM1.10 ppb
2014-04-08201404090549AM0.390 ppb
2014-04-09201404100812AM1.10 ppb
2014-04-09201404100739AM4.90 ppb
2014-04-09201404100713AM0.720 ppb
2014-04-09201404100767AM0.890 ppb
2014-04-09201404100695AM1.10 ppb
2014-04-22201404230621AM4.00 ppb
2014-04-22201404230456AM1.20 ppb
2014-04-23201404240401AM3.50 ppb
2014-04-23201404240508AM1.20 ppb
2014-06-18201406190415AM3.00 ppb
2014-07-09201407100534AM0.780 ppb
2014-07-09201407100481AM0.750 ppb
2014-07-14201407150441AM0.560 ppb
2014-08-059590-006-1130ND
2014-08-059590-007-09073.00 ppb
2014-08-059590-011-09482.30 ppb
2014-08-059590-013-09234.60 ppb
2014-08-069590-010-09322.40 ppb
2014-08-069590-017-08124.50 ppb
2014-08-139590-018-0806ND
2014-08-139590-019-07454.20 ppb
2014-08-139590-020-1320ND
2014-08-139590-023-09421.50 ppb
2014-08-139590-026-1305ND
2014-08-139590-036-08503.90 ppb
2014-08-189590-027-10124.50 ppb
2014-08-189590-035-1340ND
2014-08-209590-030-08452.20 ppb
2014-08-209590-031-10171.80 ppb
2014-08-209590-032-1005ND
2014-08-209590-034-09301.10 ppb
2014-08-259590-038-0845ND
2014-08-269590-028-0958ND
2014-08-269590-029-10422.50 ppb
2014-08-269590-033-1055ND
2014-08-269590-037-0810ND
2014-09-031610-041-08505.70 ppb
2014-09-031610-043-08451.10 ppb
2014-09-031610-048-10404.40 ppb
2014-09-031610-049-1130ND
2014-09-031610-050-0905ND
2014-09-081610-053-09501.20 ppb
2014-09-081610-061-09051.10 ppb
2014-09-081610-065-09151.20 ppb
2014-09-091610-059-08356.90 ppb
2014-09-091610-062-08401.20 ppb
2014-09-10201409110682AM2.80 ppb
2014-09-10201409110780AM6.00 ppb
2014-09-151610-069-0935ND
2014-09-151610-075-1200ND
2014-09-151610-076-09001.50 ppb
2014-09-151610-136-0910ND
2014-09-151610-140-10001.30 ppb
2014-09-171610-077-08251.40 ppb
2014-09-171610-134-07541.70 ppb
2014-09-23201409240603AM0.630 ppb
2014-09-24201409250610AM1.40 ppb
2014-10-07201410080529AM0.450 ppb
2014-10-07201410080454AM4.60 ppb
2014-10-07201410080399AM1.10 ppb
2014-10-07201410080396AM1.20 ppb
2014-10-08201410090319AM1.20 ppb
2014-10-15201410160407AMND
2014-10-27201410290066AM3.40 ppb
2014-12-09201412100750AM2.70 ppb
2014-12-101610-005-09501.60 ppb
2014-12-101610-074-10243.70 ppb
2014-12-181610-054-0735ND
2014-12-181610-057-06003.30 ppb
2014-12-181610-064-0755ND
2015-01-13201501140883AM0.570 ppb
2015-07-145810-052-07006.20 ppb
2017-06-061610-041-09453.00 ppb
2018-06-055810-041-10413.20 ppb
2019-06-061610-041-08053.40 ppb