Chromium (total)
San Antonio Water Company
Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | ND | 8 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 10 | 0 | ND |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | N/A | 0 | 0 | N/A |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EPA Maximum Contaminant
Level (MCL): 100 ppb
The legal limit for total chromium, established in 1991, was based on a 1958 toxicity study in laboratory animals, and applies to both the less-toxic trivalent chromium and the more-toxic hexavalent chromium forms of this compound. This limit does not protect against the risk of cancer from ingestion of hexavalent chromium.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-07-20 | CA3610085_013_013-201807200900 | ND |
| 2018-07-20 | CA3610085_004_004-201807201135 | ND |
| 2018-07-20 | CA3610085_016_016-201807201030 | ND |
| 2018-07-20 | CA3610085_017_017-201807200920 | ND |
| 2018-07-20 | CA3610085_018_018-201807200946 | ND |
| 2018-07-20 | CA3610085_002_002-201807200951 | ND |
| 2018-07-20 | CA3610085_003_003-201807201156 | ND |
| 2018-07-20 | CA3610085_001_001-201807201100 | ND |
| 2019-01-04 | CA3610085_011_011-201901040953 | ND |
| 2020-04-07 | CA3610085_021_021-202004071020 | ND |
| 2021-07-20 | CA3610085_013_013-202107200954 | ND |
| 2021-07-20 | CA3610085_017_017-202107200943 | ND |
| 2021-07-20 | CA3610085_001_001-202107201036 | ND |
| 2021-07-20 | CA3610085_018_018-202107201130 | ND |
| 2021-07-20 | CA3610085_011_011-202107200842 | ND |
| 2021-07-20 | CA3610085_003_003-202107201013 | ND |
| 2021-07-20 | CA3610085_002_002-202107201124 | ND |
| 2021-07-27 | CA3610085_021_021-202107271245 | ND |
| 2021-07-27 | CA3610085_016_016-202107270810 | ND |
| 2021-07-27 | CA3610085_004_004-202107270908 | ND |