Chromium (total)
Terra Bella Irrigation District - Tbt
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 | 3 | 0 | ND |
| 2019 | ND | 9 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 5 | 0 | ND |
| 2023 | 4.50 ppb | 4 | 1 | ND - 18.0 ppb |
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 |
|---|---|---|
| 2018-09-17 | CA5410038_001_001-201809171140 | ND |
| 2018-09-24 | CA5410038_027_027-201809241445 | ND |
| 2018-09-24 | CA5410038_032_032-201809241300 | ND |
| 2019-08-29 | CA5410038_014_014-201908291125 | ND |
| 2019-08-29 | CA5410038_004_004-201908291114 | ND |
| 2019-08-29 | CA5410038_013_013-201908291108 | ND |
| 2019-08-29 | CA5410038_025_025-201908291300 | ND |
| 2019-08-29 | CA5410038_020_020-201908291222 | ND |
| 2019-08-29 | CA5410038_009_009-201908291228 | ND |
| 2019-08-29 | CA5410038_001_001-201908291400 | ND |
| 2019-08-29 | CA5410038_016_016-201908291216 | ND |
| 2019-08-29 | CA5410038_002_002-201908291226 | ND |
| 2020-08-27 | CA5410038_001_001-202008271300 | ND |
| 2020-08-31 | CA5410038_024_024-202008311304 | ND |
| 2020-11-30 | CA5410038_024_024-202011301225 | ND |
| 2020-12-29 | CA5410038_028_028-202012291250 | ND |
| 2021-08-23 | CA5410038_001_001-202108231210 | ND |
| 2021-09-13 | CA5410038_032_032-202109131219 | ND |
| 2021-09-13 | CA5410038_027_027-202109131310 | ND |
| 2022-08-15 | CA5410038_001_001-202208151150 | ND |
| 2022-09-19 | CA5410038_016_016-202209191148 | ND |
| 2022-09-19 | CA5410038_020_020-202209191152 | ND |
| 2022-09-19 | CA5410038_025_025-202209191232 | ND |
| 2022-09-19 | CA5410038_009_009-202209191158 | ND |
| 2023-03-28 | CA5410038_002_002-202303281235 | ND |
| 2023-07-24 | CA5410038_001_001-202307241220 | 18.0 ppb |
| 2023-09-12 | CA5410038_024_024-202309121220 | ND |
| 2023-12-04 | CA5410038_028_028-202312041315 | ND |