Chromium (hexavalent)
North Alamo Water Supply Company
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).
46
Samples
0
Samples exceeding legal limit (MCL)
19
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | 0.0277 ppb | 46 | 19 | ND - 0.171 ppb |
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/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 |
|---|---|---|
| 2013-03-18 | 3C22016-10 | 0.119 ppb |
| 2013-03-18 | 3C22016-06 | 0.0330 ppb |
| 2013-03-18 | 3C22016-12 | 0.0471 ppb |
| 2013-03-18 | 3C22016-01 | 0.0845 ppb |
| 2013-03-18 | 3C22016-04 | 0.171 ppb |
| 2013-03-18 | 3C22016-02 | ND |
| 2013-03-18 | 3C22016-05 | 0.0559 ppb |
| 2013-03-18 | 3C22016-11 | 0.0351 ppb |
| 2013-03-18 | 3C22016-13 | ND |
| 2013-03-18 | 3C22016-07 | ND |
| 2013-03-18 | 3C22016-08 | 0.101 ppb |
| 2013-03-18 | 3C22016-09 | ND |
| 2013-06-17 | 3F21005-11A | ND |
| 2013-06-17 | 3F21005-12A | ND |
| 2013-06-17 | 3F21005-04A | 0.0852 ppb |
| 2013-06-17 | 3F21005-10A | 0.0341 ppb |
| 2013-06-17 | 3F21005-03A | 0.0303 ppb |
| 2013-06-17 | 3F21005-01A | ND |
| 2013-06-17 | 3F21005-06A | ND |
| 2013-06-17 | 3F21005-02A | 0.0849 ppb |
| 2013-06-17 | 3F21005-05A | ND |
| 2013-06-17 | 3F21005-09A | 0.0888 ppb |
| 2013-06-17 | 3F21005-07A | 0.0614 ppb |
| 2013-09-19 | 3I27015-09A | ND |
| 2013-09-19 | 3I27015-12A | ND |
| 2013-09-19 | 3I27015-06A | ND |
| 2013-09-19 | 3I27015-04A | ND |
| 2013-09-19 | 3I27015-07A | ND |
| 2013-09-19 | 3I27015-10A | ND |
| 2013-09-19 | 3I27015-08A | 0.0870 ppb |
| 2013-09-19 | 3I27015-13A | ND |
| 2013-09-19 | 3I27015-11A | ND |
| 2013-09-19 | 3I27015-02A | ND |
| 2013-09-19 | 3I27015-01A | ND |
| 2013-09-19 | 3I27015-05A | ND |
| 2013-12-10 | 3L17035-04 | 0.0432 ppb |
| 2013-12-10 | 3L17035-07 | ND |
| 2013-12-10 | 3L17035-05 | 0.0408 ppb |
| 2013-12-10 | 3L17035-02 | 0.0331 ppb |
| 2013-12-10 | 3L17035-01 | ND |
| 2013-12-10 | 3L17035-06 | ND |
| 2013-12-10 | 3L17035-09 | ND |
| 2013-12-10 | 3L17035-11 | ND |
| 2013-12-10 | 3L17035-08 | ND |
| 2013-12-10 | 3L17035-10 | 0.0382 ppb |
| 2013-12-10 | 3L17035-12 | ND |