Chromium (hexavalent)
City of Santa Clara
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).
90
Samples
0
Samples exceeding legal limit (MCL)
71
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | 1.33 ppb | 18 | 16 | ND - 2.50 ppb |
| 2014 | 0.710 ppb | 33 | 25 | ND - 3.30 ppb |
| 2015 | 1.49 ppb | 12 | 12 | 0.0300 ppb - 4.10 ppb |
| 2016 | ND | 1 | 0 | ND |
| 2017 | 1.11 ppb | 8 | 5 | ND - 2.30 ppb |
| 2018 | 1.18 ppb | 9 | 5 | ND - 3.70 ppb |
| 2019 | 1.47 ppb | 9 | 8 | ND - 2.50 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 |
|---|---|---|
| 2013-02-13 | 201302140617AM | 2.50 ppb |
| 2013-02-13 | 201302140616AM | 2.10 ppb |
| 2013-02-13 | 201302140618AM | 2.50 ppb |
| 2013-02-14 | 201302150361AM | 1.20 ppb |
| 2013-02-14 | 201302150364AM | 1.30 ppb |
| 2013-02-20 | 201302210565AM | 0.940 ppb |
| 2013-02-25 | 201302260057AM | ND |
| 2013-02-25 | 201302260061AM | 0.250 ppb |
| 2013-02-25 | 201302260063AM | 1.90 ppb |
| 2013-08-12 | 201308130009AM | 0.210 ppb |
| 2013-08-13 | 201308140243AM | 1.20 ppb |
| 2013-08-14 | 201308150316AM | ND |
| 2013-08-15 | 201308160366AM | 1.90 ppb |
| 2013-08-19 | 201308200176AM | 2.40 ppb |
| 2013-08-21 | 201308220117AM | 1.10 ppb |
| 2013-08-21 | 201308220115AM | 2.30 ppb |
| 2013-09-04 | 201309050302AM | 1.10 ppb |
| 2013-09-04 | 201309050304AM | 0.960 ppb |
| 2014-02-19 | 9590-036-1035 | ND |
| 2014-02-20 | 201402210198AM | 0.390 ppb |
| 2014-02-20 | 201402210206AM | 0.0730 ppb |
| 2014-02-20 | 201402210200AM | 0.200 ppb |
| 2014-02-20 | 201402210202AM | 0.140 ppb |
| 2014-02-20 | 201402210204AM | 0.0360 ppb |
| 2014-02-27 | 201403030004AM | 1.90 ppb |
| 2014-05-14 | 201405150020AM | 1.80 ppb |
| 2014-05-14 | 201405150113AM | 0.1000 ppb |
| 2014-05-14 | 201405150111AM | ND |
| 2014-05-14 | 201405150018AM | 0.300 ppb |
| 2014-08-26 | 201408270667AM | 1.80 ppb |
| 2014-08-26 | 201408270669AM | 3.30 ppb |
| 2014-08-27 | 9590-036-1115 | ND |
| 2014-08-28 | 201408290716AM | 0.0460 ppb |
| 2014-08-28 | 201408290712AM | 2.00 ppb |
| 2014-08-28 | 201408290710AM | 0.310 ppb |
| 2014-08-28 | 201408290714AM | 0.0490 ppb |
| 2014-08-29 | 201409030582AM | 0.190 ppb |
| 2014-11-13 | 201411150105AM | 0.770 ppb |
| 2014-11-13 | 201411150193AM | 0.0320 ppb |
| 2014-11-13 | 201411150195AM | 0.0820 ppb |
| 2014-11-13 | 201411150107AM | 0.210 ppb |
| 2014-11-20 | 9590-031-1350 | ND |
| 2014-11-20 | 9590-019-1123 | ND |
| 2014-11-20 | 9590-007-1111 | 1.30 ppb |
| 2014-11-21 | 9590-013-1133 | ND |
| 2014-11-21 | 9590-026-1058 | ND |
| 2014-11-21 | 9590-025-1043 | 2.10 ppb |
| 2014-11-21 | 9590-014-1020 | 3.20 ppb |
| 2014-12-01 | 9590-004-1234 | 1.80 ppb |
| 2014-12-01 | 9590-030-1348 | 1.30 ppb |
| 2014-12-01 | 9590-015-1249 | ND |
| 2015-02-18 | 201502190872AM | 3.20 ppb |
| 2015-02-18 | 201502190876AM | 0.280 ppb |
| 2015-02-18 | 201502190868AM | 4.10 ppb |
| 2015-02-18 | 201502190874AM | 0.0380 ppb |
| 2015-03-12 | 201503140127AM | 0.0820 ppb |
| 2015-03-12 | 201503140128AM | 2.00 ppb |
| 2015-08-17 | 201508180073AM | 0.270 ppb |
| 2015-08-17 | 201508180071AM | 1.90 ppb |
| 2015-08-19 | 201508200616AM | 3.90 ppb |
| 2015-08-19 | 201508200775AM | 0.0300 ppb |
| 2015-08-20 | 201508220219AM | 0.0920 ppb |
| 2015-08-24 | 201508250632AM | 2.00 ppb |
| 2016-09-28 | 9590-026-0855 | ND |
| 2017-04-24 | 9590-030-1120 | 1.50 ppb |
| 2017-08-14 | 9590-031-0853 | ND |
| 2017-08-14 | 9590-025-0926 | 2.30 ppb |
| 2017-08-16 | 9590-011-0901 | 2.10 ppb |
| 2017-08-16 | 9590-027-1012 | 1.80 ppb |
| 2017-08-17 | 9590-036-1055 | ND |
| 2017-08-17 | 9590-007-1209 | 1.20 ppb |
| 2017-08-23 | 9590-019-0955 | ND |
| 2018-01-23 | 9590-022-1010 | ND |
| 2018-08-13 | 9590-026-1047 | ND |
| 2018-08-13 | 9590-004-0908 | 2.20 ppb |
| 2018-08-15 | 9590-007-0942 | 1.70 ppb |
| 2018-08-16 | 9590-002-1000 | 3.70 ppb |
| 2018-08-16 | 9590-031-0900 | ND |
| 2018-08-20 | 9590-019-1042 | ND |
| 2018-08-20 | 9590-014-0840 | 1.90 ppb |
| 2018-08-20 | 9590-013-1005 | 1.10 ppb |
| 2019-08-14 | 9590-022-0905 | ND |
| 2019-08-14 | 9590-030-1002 | 1.20 ppb |
| 2019-08-20 | 9590-023-1200 | 1.90 ppb |
| 2019-08-20 | 9590-008-0945 | 1.20 ppb |
| 2019-08-20 | 9590-018-1115 | 1.40 ppb |
| 2019-08-21 | 9590-029-0905 | 2.50 ppb |
| 2019-08-21 | 9590-016-1009 | 1.30 ppb |
| 2019-08-22 | 9590-010-0920 | 1.50 ppb |
| 2019-10-01 | 9590-012-1031 | 2.20 ppb |