Chromium (total)
Hawkins Water Co-cal Water Service (puc)
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 | 6 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | 3.36 ppb | 16 | 16 | 2.20 ppb - 6.60 ppb |
| 2023 | 1.96 ppb | 19 | 18 | ND - 3.10 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 |
|---|---|---|
| 2018-02-08 | CA4900546_003_003-201802080930 | ND |
| 2018-02-08 | CA4900546_001_001-201802080925 | ND |
| 2018-03-14 | CA4900546_001_001-201803141255 | ND |
| 2018-03-14 | CA4900546_003_003-201803141250 | ND |
| 2018-04-12 | CA4900546_001_001-201804121120 | ND |
| 2018-04-12 | CA4900546_003_003-201804121115 | ND |
| 2019-03-19 | CA4900546_001_001-201903191110 | ND |
| 2019-03-19 | CA4900546_003_003-201903191115 | ND |
| 2020-07-20 | CA4900546_001_001-202007201205 | ND |
| 2020-07-20 | CA4900546_003_003-202007201215 | ND |
| 2020-08-18 | CA4900546_001_001-202008181240 | ND |
| 2022-04-12 | CA4900546_003_003-202204120810 | 3.70 ppb |
| 2022-04-12 | CA4900546_001_001-202204120815 | 4.00 ppb |
| 2022-05-09 | CA4900546_001_001-202205090815 | 2.50 ppb |
| 2022-05-09 | CA4900546_003_003-202205090800 | 3.90 ppb |
| 2022-06-13 | CA4900546_001_001-202206130810 | 6.60 ppb |
| 2022-06-13 | CA4900546_003_003-202206130815 | 5.60 ppb |
| 2022-07-12 | CA4900546_003_003-202207120840 | 3.10 ppb |
| 2022-07-12 | CA4900546_001_001-202207120830 | 3.10 ppb |
| 2022-08-09 | CA4900546_001_001-202208090815 | 3.10 ppb |
| 2022-08-09 | CA4900546_003_003-202208090820 | 3.10 ppb |
| 2022-10-05 | CA4900546_003_003-202210050810 | 2.70 ppb |
| 2022-10-05 | CA4900546_001_001-202210050815 | 2.70 ppb |
| 2022-11-16 | CA4900546_001_001-202211160830 | 2.30 ppb |
| 2022-11-16 | CA4900546_003_003-202211160830 | 2.20 ppb |
| 2022-12-13 | CA4900546_003_003-202212130825 | 2.60 ppb |
| 2022-12-13 | CA4900546_001_001-202212130830 | 2.60 ppb |
| 2023-01-12 | CA4900546_003_003-202301121405 | 2.10 ppb |
| 2023-01-12 | CA4900546_001_001-202301121400 | 2.40 ppb |
| 2023-02-14 | CA4900546_003_003-202302140815 | 2.40 ppb |
| 2023-02-14 | CA4900546_001_001-202302140830 | 2.50 ppb |
| 2023-03-16 | CA4900546_001_001-202303160755 | 1.30 ppb |
| 2023-03-16 | CA4900546_003_003-202303160750 | 1.10 ppb |
| 2023-04-10 | CA4900546_001_001-202304100745 | 1.000 ppb |
| 2023-04-10 | CA4900546_003_003-202304100740 | 1.10 ppb |
| 2023-05-16 | CA4900546_001_001-202305160810 | 2.80 ppb |
| 2023-05-16 | CA4900546_003_003-202305160805 | 2.90 ppb |
| 2023-06-15 | CA4900546_001_001-202306150750 | 2.40 ppb |
| 2023-06-15 | CA4900546_003_003-202306150755 | 2.40 ppb |
| 2023-07-16 | CA4900546_001_001-202307160810 | 2.10 ppb |
| 2023-07-16 | CA4900546_003_003-202307160815 | 3.10 ppb |
| 2023-08-29 | CA4900546_001_001-202308290810 | ND |
| 2023-09-13 | CA4900546_003_003-202309130810 | 1.50 ppb |
| 2023-09-13 | CA4900546_001_001-202309130805 | 1.80 ppb |
| 2023-10-09 | CA4900546_003_003-202310090750 | 2.20 ppb |
| 2023-10-09 | CA4900546_001_001-202310090755 | 2.10 ppb |