Chromium (total)
California Water Service Company Las Lomas
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 | 12.2 ppb | 20 | 8 | ND - 41.5 ppb |
| 2019 | 13.1 ppb | 21 | 9 | ND - 40.2 ppb |
| 2020 | 12.5 ppb | 21 | 10 | ND - 39.4 ppb |
| 2021 | 10.3 ppb | 21 | 13 | ND - 27.0 ppb |
| 2022 | 15.2 ppb | 21 | 21 | 1.30 ppb - 31.6 ppb |
| 2023 | 12.6 ppb | 21 | 18 | ND - 27.8 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 |
|---|---|---|
| 2018-01-04 | CA2710013_009_009-201801041052 | ND |
| 2018-02-06 | CA2710013_003_003-201802061402 | 24.8 ppb |
| 2018-02-06 | CA2710013_009_009-201802061346 | ND |
| 2018-02-06 | CA2710013_004_004-201802061348 | 28.4 ppb |
| 2018-03-15 | CA2710013_009_009-201803151008 | ND |
| 2018-04-02 | CA2710013_009_009-201804020927 | ND |
| 2018-05-01 | CA2710013_004_004-201805011348 | 32.9 ppb |
| 2018-05-01 | CA2710013_009_009-201805011347 | ND |
| 2018-05-01 | CA2710013_003_003-201805011410 | 41.5 ppb |
| 2018-06-21 | CA2710013_009_009-201806211112 | ND |
| 2018-07-05 | CA2710013_009_009-201807051010 | ND |
| 2018-08-02 | CA2710013_003_003-201808021003 | 29.6 ppb |
| 2018-08-02 | CA2710013_004_004-201808020939 | 33.2 ppb |
| 2018-08-02 | CA2710013_009_009-201808020940 | ND |
| 2018-09-18 | CA2710013_009_009-201809181013 | ND |
| 2018-10-03 | CA2710013_009_009-201810031003 | ND |
| 2018-11-08 | CA2710013_003_003-201811081106 | 24.0 ppb |
| 2018-11-08 | CA2710013_009_009-201811081127 | ND |
| 2018-11-08 | CA2710013_004_004-201811081125 | 29.0 ppb |
| 2018-12-18 | CA2710013_009_009-201812181204 | ND |
| 2019-01-08 | CA2710013_009_009-201901081339 | ND |
| 2019-02-05 | CA2710013_003_003-201902051043 | 27.6 ppb |
| 2019-02-05 | CA2710013_004_004-201902051018 | 40.2 ppb |
| 2019-02-05 | CA2710013_009_009-201902051021 | ND |
| 2019-03-05 | CA2710013_009_009-201903051031 | ND |
| 2019-04-09 | CA2710013_009_009-201904091005 | ND |
| 2019-05-07 | CA2710013_003_003-201905071117 | 31.2 ppb |
| 2019-05-07 | CA2710013_004_004-201905071034 | 30.9 ppb |
| 2019-05-07 | CA2710013_009_009-201905071036 | ND |
| 2019-06-05 | CA2710013_009_009-201906051157 | ND |
| 2019-07-16 | CA2710013_009_009-201907161000 | ND |
| 2019-08-06 | CA2710013_003_003-201908061306 | 29.9 ppb |
| 2019-08-06 | CA2710013_004_004-201908061331 | 32.3 ppb |
| 2019-08-06 | CA2710013_009_009-201908061332 | ND |
| 2019-08-07 | CA2710013_003_003-201908071410 | 22.0 ppb |
| 2019-09-09 | CA2710013_009_009-201909091216 | ND |
| 2019-10-07 | CA2710013_009_009-201910071140 | ND |
| 2019-11-15 | CA2710013_004_004-201911151421 | 33.1 ppb |
| 2019-11-15 | CA2710013_003_003-201911151349 | 27.5 ppb |
| 2019-11-15 | CA2710013_009_009-201911151423 | ND |
| 2019-12-05 | CA2710013_009_009-201912051141 | ND |
| 2020-01-14 | CA2710013_009_009-202001141159 | ND |
| 2020-02-04 | CA2710013_003_003-202002041326 | 39.4 ppb |
| 2020-02-04 | CA2710013_009_009-202002041250 | ND |
| 2020-02-04 | CA2710013_004_004-202002041246 | 29.9 ppb |
| 2020-03-24 | CA2710013_009_009-202003241514 | ND |
| 2020-04-07 | CA2710013_009_009-202004071342 | ND |
| 2020-05-06 | CA2710013_003_003-202005061034 | 23.8 ppb |
| 2020-05-06 | CA2710013_009_009-202005061103 | ND |
| 2020-05-06 | CA2710013_004_004-202005061100 | 25.6 ppb |
| 2020-06-02 | CA2710013_009_009-202006021330 | 11.1 ppb |
| 2020-07-13 | CA2710013_009_009-202007131020 | ND |
| 2020-08-12 | CA2710013_004_004-202008121414 | 26.0 ppb |
| 2020-08-13 | CA2710013_003_003-202008131024 | 25.6 ppb |
| 2020-08-13 | CA2710013_009_009-202008131032 | ND |
| 2020-08-13 | CA2710013_004_004-202008131031 | 26.7 ppb |
| 2020-09-16 | CA2710013_009_009-202009161044 | ND |
| 2020-10-07 | CA2710013_009_009-202010071018 | ND |
| 2020-11-05 | CA2710013_004_004-202011051152 | 28.6 ppb |
| 2020-11-05 | CA2710013_003_003-202011051331 | 25.6 ppb |
| 2020-11-05 | CA2710013_009_009-202011051154 | ND |
| 2020-12-15 | CA2710013_009_009-202012151147 | ND |
| 2021-01-12 | CA2710013_009_009-202101120941 | ND |
| 2021-02-11 | CA2710013_003_003-202102110914 | ND |
| 2021-02-11 | CA2710013_004_004-202102110939 | 27.0 ppb |
| 2021-02-11 | CA2710013_009_009-202102110941 | 26.0 ppb |
| 2021-03-15 | CA2710013_009_009-202103151144 | ND |
| 2021-04-13 | CA2710013_009_009-202104131147 | ND |
| 2021-05-11 | CA2710013_003_003-202105111330 | 23.0 ppb |
| 2021-05-11 | CA2710013_004_004-202105111316 | 25.0 ppb |
| 2021-05-11 | CA2710013_009_009-202105111317 | ND |
| 2021-06-29 | CA2710013_009_009-202106290956 | ND |
| 2021-07-14 | CA2710013_009_009-202107140919 | ND |
| 2021-08-11 | CA2710013_003_003-202108111016 | 18.0 ppb |
| 2021-08-11 | CA2710013_004_004-202108111001 | 24.0 ppb |
| 2021-08-11 | CA2710013_009_009-202108111002 | 4.10 ppb |
| 2021-09-14 | CA2710013_009_009-202109141243 | 2.00 ppb |
| 2021-09-21 | CA2710013_001_001-202109211255 | 18.0 ppb |
| 2021-10-12 | CA2710013_009_009-202110121130 | 5.00 ppb |
| 2021-11-18 | CA2710013_003_003-202111181139 | 20.0 ppb |
| 2021-11-18 | CA2710013_009_009-202111181116 | ND |
| 2021-11-18 | CA2710013_004_004-202111181113 | 23.0 ppb |
| 2021-12-13 | CA2710013_009_009-202112131046 | 2.00 ppb |
| 2022-01-20 | CA2710013_009_009-202201201230 | 1.30 ppb |
| 2022-02-01 | CA2710013_003_003-202202010953 | 20.0 ppb |
| 2022-02-01 | CA2710013_004_004-202202010934 | 23.0 ppb |
| 2022-02-01 | CA2710013_009_009-202202010935 | 1.80 ppb |
| 2022-03-08 | CA2710013_009_009-202203081001 | 5.50 ppb |
| 2022-04-18 | CA2710013_009_009-202204181001 | 8.30 ppb |
| 2022-05-03 | CA2710013_004_004-202205031056 | 30.0 ppb |
| 2022-05-03 | CA2710013_003_003-202205031114 | 26.3 ppb |
| 2022-05-03 | CA2710013_009_009-202205031058 | 9.20 ppb |
| 2022-06-01 | CA2710013_009_009-202206011014 | 11.5 ppb |
| 2022-07-12 | CA2710013_009_009-202207121135 | 7.50 ppb |
| 2022-08-03 | CA2710013_003_003-202208031410 | 24.8 ppb |
| 2022-08-03 | CA2710013_003_003-202208031403 | 25.0 ppb |
| 2022-08-03 | CA2710013_009_009-202208031346 | 5.40 ppb |
| 2022-08-03 | CA2710013_004_004-202208031345 | 25.8 ppb |
| 2022-09-21 | CA2710013_009_009-202209211356 | 13.0 ppb |
| 2022-10-14 | CA2710013_009_009-202210141022 | 7.20 ppb |
| 2022-11-28 | CA2710013_009_009-202211281206 | 5.80 ppb |
| 2022-11-28 | CA2710013_004_004-202211281205 | 28.4 ppb |
| 2022-11-30 | CA2710013_003_003-202211301020 | 31.6 ppb |
| 2022-12-08 | CA2710013_009_009-202212081144 | 7.10 ppb |
| 2023-01-24 | CA2710013_009_009-202301241040 | ND |
| 2023-02-07 | CA2710013_003_003-202302071401 | 24.7 ppb |
| 2023-02-07 | CA2710013_009_009-202302071436 | 7.90 ppb |
| 2023-02-07 | CA2710013_004_004-202302071435 | 14.4 ppb |
| 2023-03-08 | CA2710013_009_009-202303081137 | 6.40 ppb |
| 2023-04-14 | CA2710013_009_009-202304141505 | 4.40 ppb |
| 2023-05-02 | CA2710013_003_003-202305021048 | 25.8 ppb |
| 2023-05-02 | CA2710013_004_004-202305021021 | 27.4 ppb |
| 2023-05-02 | CA2710013_009_009-202305021022 | 5.80 ppb |
| 2023-06-15 | CA2710013_009_009-202306151209 | 4.30 ppb |
| 2023-07-20 | CA2710013_009_009-202307201313 | ND |
| 2023-08-10 | CA2710013_004_004-202308101036 | 24.5 ppb |
| 2023-08-10 | CA2710013_003_003-202308101014 | 19.2 ppb |
| 2023-08-10 | CA2710013_009_009-202308101037 | 6.10 ppb |
| 2023-08-23 | CA2710013_004_004-202308231314 | 26.0 ppb |
| 2023-09-13 | CA2710013_009_009-202309131043 | 5.50 ppb |
| 2023-10-24 | CA2710013_009_009-202310241310 | 5.50 ppb |
| 2023-11-07 | CA2710013_009_009-202311071030 | 5.30 ppb |
| 2023-11-07 | CA2710013_003_003-202311071041 | 24.5 ppb |
| 2023-11-07 | CA2710013_004_004-202311071029 | 27.8 ppb |
| 2023-12-14 | CA2710013_009_009-202312141330 | ND |