Chromium (hexavalent)
California Water Service Company Las Lomas
Chromium (hexavalent) is a carcinogen that commonly contaminates American drinking water. Chromium (hexavalent) in drinking water may be due to industrial pollution or natural occurrences in mineral deposits and groundwater. Read more about chromium (hexavalent).
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 | 12.3 ppb | 41 | 41 | 1.70 ppb - 33.0 ppb |
| 2019 | 13.1 ppb | 40 | 40 | 2.00 ppb - 36.0 ppb |
| 2020 | 11.7 ppb | 36 | 36 | 2.40 ppb - 34.0 ppb |
| 2021 | 11.1 ppb | 41 | 40 | ND - 27.0 ppb |
| 2022 | 11.3 ppb | 40 | 40 | 1.90 ppb - 38.0 ppb |
| 2023 | 11.1 ppb | 40 | 40 | 1.90 ppb - 27.0 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.02 ppb
The EWG Health Guideline of 0.02 ppb for chromium (hexavalent) was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-01-03 | CA2710013_003_003-201801031043 | 25.0 ppb |
| 2018-01-03 | CA2710013_009_009-201801031020 | 3.60 ppb |
| 2018-01-03 | CA2710013_010_010-201801031044 | 4.90 ppb |
| 2018-01-03 | CA2710013_009_009-201801031019 | 3.60 ppb |
| 2018-02-13 | CA2710013_004_004-201802131118 | 22.0 ppb |
| 2018-02-13 | CA2710013_009_009-201802131117 | 2.40 ppb |
| 2018-02-13 | CA2710013_010_010-201802131039 | 5.10 ppb |
| 2018-02-13 | CA2710013_003_003-201802131038 | 22.0 ppb |
| 2018-03-05 | CA2710013_003_003-201803051015 | 33.0 ppb |
| 2018-03-05 | CA2710013_009_009-201803050944 | 1.70 ppb |
| 2018-03-05 | CA2710013_010_010-201803051016 | 3.80 ppb |
| 2018-04-02 | CA2710013_009_009-201804020926 | 2.70 ppb |
| 2018-04-02 | CA2710013_010_010-201804020948 | 2.60 ppb |
| 2018-04-02 | CA2710013_003_003-201804020947 | 28.0 ppb |
| 2018-05-08 | CA2710013_004_004-201805081352 | 25.0 ppb |
| 2018-05-08 | CA2710013_009_009-201805081354 | 3.00 ppb |
| 2018-05-08 | CA2710013_003_003-201805081420 | 29.0 ppb |
| 2018-05-08 | CA2710013_010_010-201805081422 | 3.20 ppb |
| 2018-06-05 | CA2710013_010_010-201806051114 | 3.20 ppb |
| 2018-06-05 | CA2710013_009_009-201806051043 | 2.30 ppb |
| 2018-06-05 | CA2710013_003_003-201806051113 | 22.0 ppb |
| 2018-07-05 | CA2710013_009_009-201807050929 | 2.50 ppb |
| 2018-07-05 | CA2710013_003_003-201807050949 | 24.0 ppb |
| 2018-07-05 | CA2710013_010_010-201807050950 | 3.70 ppb |
| 2018-08-07 | CA2710013_003_003-201808071303 | 31.0 ppb |
| 2018-08-07 | CA2710013_004_004-201808071243 | 24.0 ppb |
| 2018-08-07 | CA2710013_009_009-201808071244 | 3.10 ppb |
| 2018-08-07 | CA2710013_010_010-201808071304 | 4.40 ppb |
| 2018-09-04 | CA2710013_009_009-201809041031 | 3.90 ppb |
| 2018-09-04 | CA2710013_010_010-201809041040 | 4.20 ppb |
| 2018-09-04 | CA2710013_003_003-201809041039 | 32.0 ppb |
| 2018-10-02 | CA2710013_009_009-201810021049 | 2.00 ppb |
| 2018-10-02 | CA2710013_010_010-201810021103 | 6.10 ppb |
| 2018-10-02 | CA2710013_003_003-201810021102 | 22.0 ppb |
| 2018-11-05 | CA2710013_009_009-201811051046 | 3.50 ppb |
| 2018-11-05 | CA2710013_004_004-201811051045 | 23.0 ppb |
| 2018-11-05 | CA2710013_003_003-201811051100 | 30.0 ppb |
| 2018-11-05 | CA2710013_010_010-201811051101 | 5.00 ppb |
| 2018-12-05 | CA2710013_003_003-201812050953 | 21.0 ppb |
| 2018-12-05 | CA2710013_009_009-201812051010 | 3.90 ppb |
| 2018-12-05 | CA2710013_010_010-201812050954 | 5.80 ppb |
| 2019-01-09 | CA2710013_009_009-201901091211 | 2.90 ppb |
| 2019-01-09 | CA2710013_010_010-201901091140 | 5.60 ppb |
| 2019-01-09 | CA2710013_003_003-201901091139 | 22.0 ppb |
| 2019-02-05 | CA2710013_009_009-201902051020 | 2.90 ppb |
| 2019-02-05 | CA2710013_010_010-201902051045 | 5.30 ppb |
| 2019-02-05 | CA2710013_003_003-201902051044 | 22.0 ppb |
| 2019-02-05 | CA2710013_004_004-201902051019 | 36.0 ppb |
| 2019-03-04 | CA2710013_003_003-201903041114 | 22.0 ppb |
| 2019-03-04 | CA2710013_009_009-201903041140 | 2.40 ppb |
| 2019-03-04 | CA2710013_010_010-201903041115 | 5.40 ppb |
| 2019-04-09 | CA2710013_003_003-201904091228 | 22.0 ppb |
| 2019-04-09 | CA2710013_009_009-201904091006 | 2.30 ppb |
| 2019-04-09 | CA2710013_010_010-201904091229 | 6.10 ppb |
| 2019-05-07 | CA2710013_003_003-201905071117 | 22.0 ppb |
| 2019-05-07 | CA2710013_004_004-201905071033 | 23.0 ppb |
| 2019-05-07 | CA2710013_009_009-201905071035 | 2.00 ppb |
| 2019-05-07 | CA2710013_010_010-201905071118 | 6.90 ppb |
| 2019-06-05 | CA2710013_009_009-201906051158 | 3.40 ppb |
| 2019-06-05 | CA2710013_003_003-201906051036 | 30.0 ppb |
| 2019-06-05 | CA2710013_010_010-201906051041 | 9.00 ppb |
| 2019-07-09 | CA2710013_009_009-201907091118 | 5.00 ppb |
| 2019-07-09 | CA2710013_003_003-201907091038 | 23.0 ppb |
| 2019-07-23 | CA2710013_010_010-201907231350 | 10.00 ppb |
| 2019-08-06 | CA2710013_004_004-201908061333 | 28.0 ppb |
| 2019-08-06 | CA2710013_003_003-201908061303 | 24.0 ppb |
| 2019-08-06 | CA2710013_010_010-201908061305 | 10.00 ppb |
| 2019-08-06 | CA2710013_009_009-201908061334 | 3.70 ppb |
| 2019-09-04 | CA2710013_003_003-201909041022 | 23.0 ppb |
| 2019-09-04 | CA2710013_010_010-201909041023 | 9.20 ppb |
| 2019-09-04 | CA2710013_009_009-201909040950 | 3.70 ppb |
| 2019-10-07 | CA2710013_003_003-201910071154 | 23.0 ppb |
| 2019-10-07 | CA2710013_009_009-201910071139 | 2.40 ppb |
| 2019-10-07 | CA2710013_010_010-201910071155 | 9.20 ppb |
| 2019-11-05 | CA2710013_010_010-201911051045 | 6.60 ppb |
| 2019-11-05 | CA2710013_003_003-201911051044 | 23.0 ppb |
| 2019-11-05 | CA2710013_009_009-201911051031 | 2.50 ppb |
| 2019-11-05 | CA2710013_004_004-201911051030 | 27.0 ppb |
| 2019-12-05 | CA2710013_010_010-201912051203 | 7.70 ppb |
| 2019-12-05 | CA2710013_003_003-201912051202 | 25.0 ppb |
| 2019-12-05 | CA2710013_009_009-201912051140 | 4.20 ppb |
| 2020-01-08 | CA2710013_009_009-202001081050 | 3.60 ppb |
| 2020-01-08 | CA2710013_010_010-202001081038 | 7.10 ppb |
| 2020-01-08 | CA2710013_003_003-202001081039 | 23.0 ppb |
| 2020-02-04 | CA2710013_010_010-202002041325 | 6.20 ppb |
| 2020-02-04 | CA2710013_004_004-202002041247 | 24.0 ppb |
| 2020-02-04 | CA2710013_003_003-202002041326 | 34.0 ppb |
| 2020-02-04 | CA2710013_009_009-202002041251 | 2.40 ppb |
| 2020-03-04 | CA2710013_003_003-202003041040 | 22.0 ppb |
| 2020-03-04 | CA2710013_009_009-202003041031 | 3.60 ppb |
| 2020-03-04 | CA2710013_010_010-202003041043 | 6.70 ppb |
| 2020-04-08 | CA2710013_003_003-202004081223 | 23.0 ppb |
| 2020-04-08 | CA2710013_009_009-202004081246 | 2.50 ppb |
| 2020-04-08 | CA2710013_010_010-202004081224 | 6.30 ppb |
| 2020-05-06 | CA2710013_003_003-202005061033 | 22.0 ppb |
| 2020-05-06 | CA2710013_009_009-202005061102 | 4.20 ppb |
| 2020-05-06 | CA2710013_010_010-202005061032 | 4.00 ppb |
| 2020-05-06 | CA2710013_004_004-202005061059 | 23.0 ppb |
| 2020-06-02 | CA2710013_003_003-202006021349 | 23.0 ppb |
| 2020-06-02 | CA2710013_009_009-202006021351 | 4.10 ppb |
| 2020-06-02 | CA2710013_010_010-202006021350 | 5.10 ppb |
| 2020-07-30 | CA2710013_009_009-202007300919 | 2.80 ppb |
| 2020-07-30 | CA2710013_010_010-202007300927 | 4.20 ppb |
| 2020-07-30 | CA2710013_003_003-202007300926 | 23.0 ppb |
| 2020-09-16 | CA2710013_009_009-202009161044 | 2.60 ppb |
| 2020-09-16 | CA2710013_010_010-202009161105 | 3.80 ppb |
| 2020-09-16 | CA2710013_003_003-202009161104 | 23.0 ppb |
| 2020-10-07 | CA2710013_003_003-202010071026 | 23.0 ppb |
| 2020-10-07 | CA2710013_010_010-202010071029 | 3.30 ppb |
| 2020-10-07 | CA2710013_009_009-202010071019 | 3.60 ppb |
| 2020-11-05 | CA2710013_009_009-202011051353 | 2.90 ppb |
| 2020-11-05 | CA2710013_010_010-202011051333 | 4.10 ppb |
| 2020-11-05 | CA2710013_004_004-202011051351 | 22.0 ppb |
| 2020-11-05 | CA2710013_003_003-202011051332 | 22.0 ppb |
| 2020-12-03 | CA2710013_009_009-202012030932 | 3.50 ppb |
| 2020-12-15 | CA2710013_010_010-202012151206 | 3.90 ppb |
| 2020-12-15 | CA2710013_003_003-202012151205 | 23.0 ppb |
| 2021-01-04 | CA2710013_003_003-202101040926 | 23.0 ppb |
| 2021-01-04 | CA2710013_010_010-202101040927 | 3.00 ppb |
| 2021-01-26 | CA2710013_009_009-202101261448 | 3.30 ppb |
| 2021-02-11 | CA2710013_009_009-202102110945 | 3.00 ppb |
| 2021-02-11 | CA2710013_003_003-202102110909 | 26.0 ppb |
| 2021-02-11 | CA2710013_004_004-202102110944 | 24.0 ppb |
| 2021-02-11 | CA2710013_010_010-202102110911 | 2.90 ppb |
| 2021-03-02 | CA2710013_003_003-202103021216 | 23.0 ppb |
| 2021-03-02 | CA2710013_009_009-202103021200 | 3.50 ppb |
| 2021-03-02 | CA2710013_010_010-202103021217 | 2.80 ppb |
| 2021-04-13 | CA2710013_009_009-202104131150 | 3.30 ppb |
| 2021-04-13 | CA2710013_003_003-202104131212 | 23.0 ppb |
| 2021-04-13 | CA2710013_010_010-202104131213 | 3.40 ppb |
| 2021-05-11 | CA2710013_003_003-202105111327 | 22.0 ppb |
| 2021-05-11 | CA2710013_009_009-202105111314 | 3.40 ppb |
| 2021-05-11 | CA2710013_004_004-202105111313 | 24.0 ppb |
| 2021-05-11 | CA2710013_010_010-202105111328 | 3.70 ppb |
| 2021-06-03 | CA2710013_010_010-202106031255 | 3.90 ppb |
| 2021-06-03 | CA2710013_003_003-202106031256 | 25.0 ppb |
| 2021-06-03 | CA2710013_009_009-202106031054 | ND |
| 2021-07-13 | CA2710013_003_003-202107131031 | 22.0 ppb |
| 2021-07-13 | CA2710013_010_010-202107131033 | 3.30 ppb |
| 2021-07-14 | CA2710013_009_009-202107140916 | 7.20 ppb |
| 2021-08-11 | CA2710013_003_003-202108111017 | 19.0 ppb |
| 2021-08-11 | CA2710013_009_009-202108110959 | 4.90 ppb |
| 2021-08-11 | CA2710013_004_004-202108110958 | 21.0 ppb |
| 2021-08-11 | CA2710013_010_010-202108111018 | 3.80 ppb |
| 2021-09-14 | CA2710013_010_010-202109141231 | 3.90 ppb |
| 2021-09-14 | CA2710013_003_003-202109141230 | 22.0 ppb |
| 2021-09-14 | CA2710013_009_009-202109141242 | 1.70 ppb |
| 2021-09-21 | CA2710013_001_001-202109211223 | 7.70 ppb |
| 2021-10-12 | CA2710013_009_009-202110121132 | 4.00 ppb |
| 2021-10-12 | CA2710013_010_010-202110121151 | 3.10 ppb |
| 2021-10-12 | CA2710013_003_003-202110121150 | 22.0 ppb |
| 2021-11-18 | CA2710013_004_004-202111181114 | 20.0 ppb |
| 2021-11-18 | CA2710013_009_009-202111181115 | 1.80 ppb |
| 2021-11-18 | CA2710013_010_010-202111181142 | 3.80 ppb |
| 2021-11-18 | CA2710013_003_003-202111181140 | 22.0 ppb |
| 2021-12-13 | CA2710013_010_010-202112131102 | 4.30 ppb |
| 2021-12-13 | CA2710013_003_003-202112131100 | 27.0 ppb |
| 2021-12-13 | CA2710013_009_009-202112131044 | 3.50 ppb |
| 2022-01-13 | CA2710013_009_009-202201131249 | 3.50 ppb |
| 2022-01-13 | CA2710013_003_003-202201131315 | 21.0 ppb |
| 2022-01-13 | CA2710013_010_010-202201131316 | 4.50 ppb |
| 2022-02-01 | CA2710013_003_003-202202010951 | 21.0 ppb |
| 2022-02-01 | CA2710013_004_004-202202010938 | 22.0 ppb |
| 2022-02-01 | CA2710013_009_009-202202010939 | 2.50 ppb |
| 2022-02-01 | CA2710013_010_010-202202010952 | 5.20 ppb |
| 2022-03-08 | CA2710013_009_009-202203081000 | 5.00 ppb |
| 2022-03-08 | CA2710013_010_010-202203081015 | 3.80 ppb |
| 2022-03-08 | CA2710013_003_003-202203081014 | 21.0 ppb |
| 2022-04-07 | CA2710013_009_009-202204071206 | 2.80 ppb |
| 2022-04-07 | CA2710013_003_003-202204071229 | 23.0 ppb |
| 2022-04-07 | CA2710013_010_010-202204071230 | 5.00 ppb |
| 2022-05-03 | CA2710013_003_003-202205031115 | 21.0 ppb |
| 2022-05-03 | CA2710013_009_009-202205031057 | 4.90 ppb |
| 2022-05-03 | CA2710013_004_004-202205031055 | 22.0 ppb |
| 2022-05-03 | CA2710013_010_010-202205031116 | 3.20 ppb |
| 2022-06-29 | CA2710013_003_003-202206291317 | 23.0 ppb |
| 2022-06-29 | CA2710013_009_009-202206291306 | 4.30 ppb |
| 2022-06-29 | CA2710013_010_010-202206291320 | 2.20 ppb |
| 2022-07-12 | CA2710013_009_009-202207121136 | 2.70 ppb |
| 2022-07-12 | CA2710013_010_010-202207121151 | 3.10 ppb |
| 2022-07-12 | CA2710013_003_003-202207121149 | 22.0 ppb |
| 2022-08-03 | CA2710013_003_003-202208031400 | 23.0 ppb |
| 2022-08-03 | CA2710013_004_004-202208031340 | 11.0 ppb |
| 2022-08-03 | CA2710013_010_010-202208031401 | 2.90 ppb |
| 2022-08-03 | CA2710013_009_009-202208031341 | 2.10 ppb |
| 2022-09-07 | CA2710013_003_003-202209071029 | 24.0 ppb |
| 2022-09-07 | CA2710013_009_009-202209071013 | 6.20 ppb |
| 2022-09-07 | CA2710013_010_010-202209071030 | 3.80 ppb |
| 2022-10-06 | CA2710013_003_003-202210061231 | 24.0 ppb |
| 2022-10-06 | CA2710013_009_009-202210061218 | 14.0 ppb |
| 2022-10-06 | CA2710013_010_010-202210061232 | 2.80 ppb |
| 2022-11-03 | CA2710013_010_010-202211031324 | 2.20 ppb |
| 2022-11-03 | CA2710013_003_003-202211031326 | 23.0 ppb |
| 2022-11-03 | CA2710013_004_004-202211031314 | 18.0 ppb |
| 2022-11-03 | CA2710013_009_009-202211031315 | 4.50 ppb |
| 2022-12-13 | CA2710013_010_010-202212131022 | 3.10 ppb |
| 2022-12-13 | CA2710013_009_009-202212131002 | 1.90 ppb |
| 2022-12-13 | CA2710013_003_003-202212131021 | 38.0 ppb |
| 2023-01-04 | CA2710013_003_003-202301041346 | 24.0 ppb |
| 2023-01-04 | CA2710013_010_010-202301041347 | 2.40 ppb |
| 2023-01-04 | CA2710013_009_009-202301041318 | 2.30 ppb |
| 2023-02-07 | CA2710013_010_010-202302071416 | 2.20 ppb |
| 2023-02-07 | CA2710013_004_004-202302071430 | 12.0 ppb |
| 2023-02-07 | CA2710013_009_009-202302071431 | 5.10 ppb |
| 2023-02-07 | CA2710013_003_003-202302071415 | 24.0 ppb |
| 2023-03-08 | CA2710013_009_009-202303081138 | 3.30 ppb |
| 2023-03-08 | CA2710013_010_010-202303081201 | 2.50 ppb |
| 2023-03-08 | CA2710013_003_003-202303081200 | 23.0 ppb |
| 2023-04-11 | CA2710013_009_009-202304111041 | 2.40 ppb |
| 2023-04-11 | CA2710013_003_003-202304111103 | 23.0 ppb |
| 2023-04-11 | CA2710013_010_010-202304111104 | 3.00 ppb |
| 2023-05-02 | CA2710013_003_003-202305021046 | 25.0 ppb |
| 2023-05-02 | CA2710013_009_009-202305021022 | 2.20 ppb |
| 2023-05-02 | CA2710013_004_004-202305021021 | 26.0 ppb |
| 2023-05-02 | CA2710013_010_010-202305021047 | 1.90 ppb |
| 2023-06-12 | CA2710013_003_003-202306121031 | 24.0 ppb |
| 2023-06-12 | CA2710013_009_009-202306121016 | 2.30 ppb |
| 2023-06-12 | CA2710013_010_010-202306121032 | 2.20 ppb |
| 2023-07-10 | CA2710013_003_003-202307101156 | 26.0 ppb |
| 2023-07-10 | CA2710013_010_010-202307101157 | 3.10 ppb |
| 2023-07-10 | CA2710013_009_009-202307101131 | 3.30 ppb |
| 2023-08-10 | CA2710013_004_004-202308101043 | 27.0 ppb |
| 2023-08-10 | CA2710013_003_003-202308101012 | 23.0 ppb |
| 2023-08-10 | CA2710013_009_009-202308101044 | 3.40 ppb |
| 2023-08-10 | CA2710013_010_010-202308101013 | 2.90 ppb |
| 2023-09-13 | CA2710013_009_009-202309131044 | 3.00 ppb |
| 2023-09-18 | CA2710013_003_003-202309181418 | 24.0 ppb |
| 2023-09-18 | CA2710013_010_010-202309181419 | 2.30 ppb |
| 2023-10-19 | CA2710013_003_003-202310190959 | 23.0 ppb |
| 2023-10-19 | CA2710013_009_009-202310191020 | 3.30 ppb |
| 2023-10-19 | CA2710013_010_010-202310191000 | 3.10 ppb |
| 2023-11-07 | CA2710013_009_009-202311071027 | 3.90 ppb |
| 2023-11-07 | CA2710013_003_003-202311071042 | 23.0 ppb |
| 2023-11-07 | CA2710013_010_010-202311071043 | 2.80 ppb |
| 2023-11-07 | CA2710013_004_004-202311071026 | 26.0 ppb |
| 2023-12-14 | CA2710013_010_010-202312141347 | 2.70 ppb |
| 2023-12-14 | CA2710013_003_003-202312141346 | 23.0 ppb |
| 2023-12-14 | CA2710013_009_009-202312141329 | 3.20 ppb |