Chromium (total)
Cws-split Mountain Water System
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 | 5 | 0 | ND |
| 2020 | ND | 13 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | 2.81 ppb | 18 | 16 | ND - 7.00 ppb |
| 2023 | 1.61 ppb | 21 | 18 | ND - 2.80 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 |
|---|---|---|
| 2018-01-23 | CA1500407_005_005-201801231010 | ND |
| 2018-01-23 | CA1500407_006_006-201801230950 | ND |
| 2018-02-07 | CA1500407_005_005-201802071345 | ND |
| 2018-02-07 | CA1500407_006_006-201802071430 | ND |
| 2018-05-02 | CA1500407_005_005-201805020835 | ND |
| 2018-05-02 | CA1500407_006_006-201805020935 | ND |
| 2019-01-15 | CA1500407_005_005-201901151150 | ND |
| 2019-01-15 | CA1500407_006_006-201901151132 | ND |
| 2019-05-08 | CA1500407_006_006-201905081138 | ND |
| 2019-05-08 | CA1500407_005_005-201905081111 | ND |
| 2019-05-13 | CA1500407_002_002-201905130958 | ND |
| 2020-01-22 | CA1500407_005_005-202001221450 | ND |
| 2020-01-22 | CA1500407_006_006-202001221438 | ND |
| 2020-02-11 | CA1500407_007_007-202002111247 | ND |
| 2020-05-06 | CA1500407_005_005-202005061335 | ND |
| 2020-05-06 | CA1500407_006_006-202005061329 | ND |
| 2020-06-09 | CA1500407_006_006-202006090834 | ND |
| 2020-06-09 | CA1500407_005_005-202006090820 | ND |
| 2020-08-05 | CA1500407_006_006-202008051023 | ND |
| 2020-08-05 | CA1500407_005_005-202008051050 | ND |
| 2020-10-21 | CA1500407_006_006-202010211345 | ND |
| 2020-10-21 | CA1500407_005_005-202010211339 | ND |
| 2020-11-19 | CA1500407_005_005-202011191234 | ND |
| 2020-11-19 | CA1500407_006_006-202011191213 | ND |
| 2021-01-26 | CA1500407_006_006-202101261336 | ND |
| 2021-01-26 | CA1500407_006_006-202101261336 | ND |
| 2021-01-26 | CA1500407_005_005-202101261344 | ND |
| 2022-01-18 | CA1500407_005_005-202201181056 | ND |
| 2022-01-18 | CA1500407_006_006-202201181111 | ND |
| 2022-04-07 | CA1500407_006_006-202204071005 | 3.00 ppb |
| 2022-04-07 | CA1500407_005_005-202204071013 | 2.70 ppb |
| 2022-05-03 | CA1500407_006_006-202205031110 | 2.60 ppb |
| 2022-05-03 | CA1500407_005_005-202205031106 | 2.70 ppb |
| 2022-06-15 | CA1500407_005_005-202206151412 | 6.00 ppb |
| 2022-06-15 | CA1500407_006_006-202206151416 | 7.00 ppb |
| 2022-07-13 | CA1500407_005_005-202207130916 | 4.50 ppb |
| 2022-07-13 | CA1500407_006_006-202207130925 | 3.90 ppb |
| 2022-08-11 | CA1500407_006_006-202208110933 | 2.10 ppb |
| 2022-08-11 | CA1500407_005_005-202208110938 | 2.00 ppb |
| 2022-10-06 | CA1500407_006_006-202210060825 | 2.70 ppb |
| 2022-10-06 | CA1500407_005_005-202210060815 | 2.70 ppb |
| 2022-11-15 | CA1500407_006_006-202211151132 | 2.30 ppb |
| 2022-11-15 | CA1500407_005_005-202211151123 | 2.00 ppb |
| 2022-12-15 | CA1500407_005_005-202212151057 | 2.30 ppb |
| 2022-12-15 | CA1500407_006_006-202212151103 | 2.10 ppb |
| 2023-01-12 | CA1500407_005_005-202301121113 | 2.30 ppb |
| 2023-01-12 | CA1500407_006_006-202301121110 | 2.80 ppb |
| 2023-01-26 | CA1500407_006_006-202301260934 | ND |
| 2023-01-26 | CA1500407_005_005-202301260926 | ND |
| 2023-02-07 | CA1500407_006_006-202302071432 | 1.90 ppb |
| 2023-02-07 | CA1500407_005_005-202302071417 | 1.80 ppb |
| 2023-02-23 | CA1500407_007_007-202302231300 | ND |
| 2023-03-13 | CA1500407_005_005-202303131005 | 1.30 ppb |
| 2023-03-13 | CA1500407_006_006-202303130955 | 1.30 ppb |
| 2023-04-12 | CA1500407_005_005-202304121340 | 1.30 ppb |
| 2023-04-12 | CA1500407_006_006-202304121344 | 1.50 ppb |
| 2023-05-18 | CA1500407_006_006-202305180914 | 1.60 ppb |
| 2023-05-18 | CA1500407_005_005-202305180908 | 1.40 ppb |
| 2023-06-08 | CA1500407_006_006-202306081135 | 2.60 ppb |
| 2023-06-08 | CA1500407_005_005-202306081113 | 2.50 ppb |
| 2023-07-12 | CA1500407_005_005-202307120930 | 1.80 ppb |
| 2023-07-12 | CA1500407_006_006-202307120920 | 1.90 ppb |
| 2023-08-15 | CA1500407_005_005-202308151425 | 1.50 ppb |
| 2023-08-15 | CA1500407_006_006-202308151420 | 1.70 ppb |
| 2023-10-10 | CA1500407_005_005-202310101147 | 2.30 ppb |
| 2023-10-10 | CA1500407_006_006-202310101143 | 2.30 ppb |