Chromium (hexavalent)
Cal Am - Dunnigan
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 | 25.9 ppb | 6 | 4 | ND - 42.1 ppb |
| 2019 | 4.90 ppb | 31 | 4 | ND - 50.0 ppb |
| 2020 | 5.99 ppb | 35 | 9 | ND - 55.0 ppb |
| 2021 | 3.15 ppb | 49 | 12 | ND - 40.0 ppb |
| 2022 | 3.92 ppb | 49 | 6 | ND - 47.0 ppb |
| 2023 | 7.43 ppb | 61 | 15 | ND - 52.5 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 |
|---|---|---|
| 2018-02-14 | CA5700712_001_001-201802140900 | 36.8 ppb |
| 2018-05-01 | CA5700712_001_001-201805011110 | 37.8 ppb |
| 2018-08-14 | CA5700712_001_001-201808141005 | 39.0 ppb |
| 2018-11-06 | CA5700712_001_001-201811061030 | 42.1 ppb |
| 2018-12-11 | CA5700712_004_005-201812111128 | ND |
| 2018-12-11 | CA5700712_004_007-201812111134 | ND |
| 2019-01-08 | CA5700712_004_007-201901080921 | ND |
| 2019-01-08 | CA5700712_004_005-201901080913 | ND |
| 2019-01-08 | CA5700712_011_011-201901080925 | ND |
| 2019-02-19 | CA5700712_001_001-201902191130 | 50.0 ppb |
| 2019-03-13 | CA5700712_004_007-201903131210 | ND |
| 2019-03-13 | CA5700712_004_005-201903131200 | ND |
| 2019-05-08 | CA5700712_001_001-201905080926 | 39.0 ppb |
| 2019-05-08 | CA5700712_004_004-201905081124 | ND |
| 2019-05-08 | CA5700712_004_005-201905081128 | ND |
| 2019-05-08 | CA5700712_004_004-201905080940 | 17.0 ppb |
| 2019-05-08 | CA5700712_004_006-201905081133 | ND |
| 2019-05-08 | CA5700712_004_007-201905081137 | ND |
| 2019-05-08 | CA5700712_011_011-201905081143 | ND |
| 2019-06-12 | CA5700712_004_005-201906121303 | ND |
| 2019-06-12 | CA5700712_004_007-201906121312 | ND |
| 2019-06-12 | CA5700712_011_011-201906121316 | ND |
| 2019-07-17 | CA5700712_004_005-201907171057 | ND |
| 2019-07-17 | CA5700712_004_007-201907171105 | ND |
| 2019-07-17 | CA5700712_011_011-201907171110 | ND |
| 2019-09-10 | CA5700712_004_005-201909101156 | ND |
| 2019-09-10 | CA5700712_004_007-201909101203 | ND |
| 2019-10-15 | CA5700712_011_011-201910151158 | ND |
| 2019-11-26 | CA5700712_001_001-201911261010 | 46.0 ppb |
| 2019-11-26 | CA5700712_004_006-201911261102 | ND |
| 2019-11-26 | CA5700712_004_007-201911261105 | ND |
| 2019-11-26 | CA5700712_004_004-201911261055 | ND |
| 2019-11-26 | CA5700712_004_005-201911261058 | ND |
| 2019-11-26 | CA5700712_011_011-201911261108 | ND |
| 2019-12-18 | CA5700712_004_007-201912181120 | ND |
| 2019-12-18 | CA5700712_011_011-201912181125 | ND |
| 2019-12-18 | CA5700712_004_005-201912181113 | ND |
| 2020-01-22 | CA5700712_004_005-202001220900 | ND |
| 2020-01-22 | CA5700712_004_007-202001220910 | ND |
| 2020-01-22 | CA5700712_011_011-202001220915 | ND |
| 2020-02-12 | CA5700712_004_006-202002121020 | 7.70 ppb |
| 2020-02-12 | CA5700712_001_001-202002121015 | 55.0 ppb |
| 2020-02-12 | CA5700712_004_007-202002121023 | ND |
| 2020-02-12 | CA5700712_011_011-202002121025 | ND |
| 2020-02-12 | CA5700712_004_004-202002121015 | 5.60 ppb |
| 2020-02-12 | CA5700712_004_005-202002121018 | ND |
| 2020-04-16 | CA5700712_004_005-202004160850 | ND |
| 2020-04-16 | CA5700712_004_007-202004160900 | ND |
| 2020-05-14 | CA5700712_004_007-202005141016 | ND |
| 2020-05-14 | CA5700712_004_004-202005141010 | 19.0 ppb |
| 2020-05-14 | CA5700712_004_005-202005141012 | ND |
| 2020-05-14 | CA5700712_001_001-202005140905 | 48.0 ppb |
| 2020-05-14 | CA5700712_004_006-202005141014 | 19.0 ppb |
| 2020-05-14 | CA5700712_011_011-202005141018 | ND |
| 2020-06-10 | CA5700712_011_011-202006100930 | ND |
| 2020-06-10 | CA5700712_004_005-202006100915 | ND |
| 2020-06-10 | CA5700712_004_007-202006100924 | ND |
| 2020-07-16 | CA5700712_011_011-202007161015 | ND |
| 2020-07-16 | CA5700712_004_005-202007160958 | ND |
| 2020-07-16 | CA5700712_004_007-202007161008 | 1.90 ppb |
| 2020-08-18 | CA5700712_004_004-202008181020 | ND |
| 2020-08-18 | CA5700712_004_005-202008181023 | ND |
| 2020-08-18 | CA5700712_004_006-202008181027 | ND |
| 2020-08-18 | CA5700712_004_007-202008181030 | ND |
| 2020-08-18 | CA5700712_001_001-202008180910 | 52.0 ppb |
| 2020-08-18 | CA5700712_011_011-202008181033 | ND |
| 2020-10-07 | CA5700712_004_005-202010071000 | ND |
| 2020-10-07 | CA5700712_004_007-202010071010 | ND |
| 2020-10-07 | CA5700712_011_011-202010071015 | ND |
| 2020-12-09 | CA5700712_004_007-202012090945 | 1.50 ppb |
| 2020-12-09 | CA5700712_011_011-202012090950 | ND |
| 2020-12-09 | CA5700712_004_005-202012090935 | ND |
| 2021-01-21 | CA5700712_004_005-202101211120 | ND |
| 2021-01-21 | CA5700712_004_007-202101211130 | ND |
| 2021-01-21 | CA5700712_011_011-202101211135 | ND |
| 2021-02-10 | CA5700712_004_007-202102101005 | 1.60 ppb |
| 2021-02-10 | CA5700712_001_001-202102100930 | 39.0 ppb |
| 2021-02-10 | CA5700712_011_011-202102101010 | ND |
| 2021-02-10 | CA5700712_004_004-202102100950 | ND |
| 2021-02-10 | CA5700712_004_005-202102100955 | ND |
| 2021-02-10 | CA5700712_004_006-202102101000 | ND |
| 2021-03-09 | CA5700712_004_005-202103091035 | ND |
| 2021-03-09 | CA5700712_011_011-202103091050 | ND |
| 2021-03-09 | CA5700712_004_007-202103091045 | ND |
| 2021-04-14 | CA5700712_004_005-202104141235 | ND |
| 2021-04-14 | CA5700712_011_011-202104141250 | ND |
| 2021-04-14 | CA5700712_004_007-202104141245 | 2.20 ppb |
| 2021-05-12 | CA5700712_004_007-202105121050 | 2.40 ppb |
| 2021-05-12 | CA5700712_011_011-202105121055 | 1.70 ppb |
| 2021-05-12 | CA5700712_001_001-202105120900 | 40.0 ppb |
| 2021-05-12 | CA5700712_004_005-202105121040 | ND |
| 2021-05-12 | CA5700712_004_004-202105121035 | ND |
| 2021-05-12 | CA5700712_004_006-202105121045 | ND |
| 2021-05-20 | CA5700712_011_011-202105201045 | ND |
| 2021-06-10 | CA5700712_004_005-202106100955 | ND |
| 2021-06-10 | CA5700712_004_007-202106101005 | 2.20 ppb |
| 2021-06-10 | CA5700712_011_011-202106101010 | ND |
| 2021-07-08 | CA5700712_004_007-202107081005 | 2.20 ppb |
| 2021-07-08 | CA5700712_004_005-202107080955 | 2.20 ppb |
| 2021-07-08 | CA5700712_011_011-202107081010 | 1.90 ppb |
| 2021-08-12 | CA5700712_004_006-202108121025 | ND |
| 2021-08-12 | CA5700712_004_004-202108121015 | ND |
| 2021-08-12 | CA5700712_004_005-202108121020 | ND |
| 2021-08-12 | CA5700712_004_007-202108121030 | ND |
| 2021-08-12 | CA5700712_011_011-202108121035 | ND |
| 2021-08-18 | CA5700712_001_001-202108181115 | 38.0 ppb |
| 2021-09-21 | CA5700712_004_007-202109210955 | ND |
| 2021-09-21 | CA5700712_004_005-202109210945 | ND |
| 2021-09-21 | CA5700712_011_011-202109211000 | ND |
| 2021-10-18 | CA5700712_004_005-202110181135 | ND |
| 2021-10-18 | CA5700712_004_007-202110181145 | ND |
| 2021-10-18 | CA5700712_011_011-202110181150 | ND |
| 2021-11-10 | CA5700712_001_001-202111100900 | 21.0 ppb |
| 2021-11-10 | CA5700712_004_007-202111101150 | ND |
| 2021-11-10 | CA5700712_011_011-202111101155 | ND |
| 2021-11-10 | CA5700712_004_004-202111101130 | ND |
| 2021-11-10 | CA5700712_004_005-202111101135 | ND |
| 2021-11-10 | CA5700712_004_006-202111101140 | ND |
| 2021-12-21 | CA5700712_004_007-202112211155 | ND |
| 2021-12-21 | CA5700712_011_011-202112211200 | ND |
| 2021-12-21 | CA5700712_004_005-202112211145 | ND |
| 2022-01-20 | CA5700712_004_005-202201201000 | ND |
| 2022-01-20 | CA5700712_004_007-202201201004 | ND |
| 2022-01-20 | CA5700712_011_011-202201201006 | ND |
| 2022-02-15 | CA5700712_001_001-202202151055 | 40.0 ppb |
| 2022-02-15 | CA5700712_004_005-202202151110 | ND |
| 2022-02-15 | CA5700712_004_004-202202151105 | ND |
| 2022-02-15 | CA5700712_004_006-202202151115 | ND |
| 2022-02-15 | CA5700712_004_007-202202151120 | ND |
| 2022-02-15 | CA5700712_011_011-202202151125 | ND |
| 2022-03-17 | CA5700712_004_007-202203171225 | ND |
| 2022-03-17 | CA5700712_004_005-202203171215 | ND |
| 2022-03-17 | CA5700712_011_011-202203171230 | ND |
| 2022-04-13 | CA5700712_004_007-202204131021 | ND |
| 2022-04-13 | CA5700712_004_005-202204131017 | ND |
| 2022-04-13 | CA5700712_011_011-202204131025 | ND |
| 2022-05-18 | CA5700712_011_011-202205181300 | ND |
| 2022-05-18 | CA5700712_001_001-202205181130 | 47.0 ppb |
| 2022-05-18 | CA5700712_004_005-202205181245 | ND |
| 2022-05-18 | CA5700712_004_004-202205181240 | ND |
| 2022-05-18 | CA5700712_004_006-202205181250 | ND |
| 2022-05-18 | CA5700712_004_007-202205181255 | ND |
| 2022-06-07 | CA5700712_004_005-202206071135 | ND |
| 2022-06-07 | CA5700712_004_007-202206071150 | ND |
| 2022-06-07 | CA5700712_011_011-202206071155 | ND |
| 2022-07-12 | CA5700712_004_005-202207120920 | ND |
| 2022-07-12 | CA5700712_004_007-202207120930 | ND |
| 2022-07-12 | CA5700712_011_011-202207120935 | ND |
| 2022-08-17 | CA5700712_004_004-202208170910 | ND |
| 2022-08-17 | CA5700712_004_005-202208170915 | ND |
| 2022-08-17 | CA5700712_004_007-202208170925 | ND |
| 2022-08-17 | CA5700712_001_001-202208170830 | 25.0 ppb |
| 2022-08-17 | CA5700712_011_011-202208170930 | ND |
| 2022-08-17 | CA5700712_004_006-202208170920 | ND |
| 2022-08-23 | CA5700712_050_050-202208230900 | 31.0 ppb |
| 2022-09-21 | CA5700712_004_005-202209211245 | ND |
| 2022-09-21 | CA5700712_004_007-202209211255 | 1.90 ppb |
| 2022-09-21 | CA5700712_011_011-202209211300 | ND |
| 2022-10-11 | CA5700712_004_005-202210111012 | ND |
| 2022-10-11 | CA5700712_004_007-202210111016 | ND |
| 2022-10-11 | CA5700712_011_011-202210111018 | ND |
| 2022-11-09 | CA5700712_011_011-202211091043 | ND |
| 2022-11-09 | CA5700712_004_007-202211091040 | ND |
| 2022-11-09 | CA5700712_004_005-202211091035 | ND |
| 2022-11-09 | CA5700712_004_006-202211091037 | ND |
| 2022-11-09 | CA5700712_001_001-202211091015 | 47.0 ppb |
| 2022-11-09 | CA5700712_004_004-202211091032 | ND |
| 2022-12-13 | CA5700712_004_007-202212131107 | ND |
| 2022-12-13 | CA5700712_004_005-202212131103 | ND |
| 2022-12-13 | CA5700712_011_011-202212131110 | ND |
| 2023-01-17 | CA5700712_050_050-202301171100 | 26.0 ppb |
| 2023-01-19 | CA5700712_011_011-202301191125 | ND |
| 2023-01-19 | CA5700712_004_005-202301191117 | ND |
| 2023-01-19 | CA5700712_004_007-202301191122 | ND |
| 2023-02-07 | CA5700712_001_001-202302070948 | 39.0 ppb |
| 2023-02-07 | CA5700712_004_007-202302071306 | ND |
| 2023-02-07 | CA5700712_011_011-202302071325 | ND |
| 2023-02-07 | CA5700712_004_005-202302071303 | ND |
| 2023-02-07 | CA5700712_050_050-202302071235 | 52.5 ppb |
| 2023-02-07 | CA5700712_050_050-202302071235 | 52.0 ppb |
| 2023-02-07 | CA5700712_004_004-202302071300 | ND |
| 2023-02-07 | CA5700712_004_006-202302071308 | ND |
| 2023-02-14 | CA5700712_004_004-202302140820 | ND |
| 2023-02-14 | CA5700712_004_005-202302140822 | ND |
| 2023-02-14 | CA5700712_004_006-202302140828 | ND |
| 2023-02-14 | CA5700712_004_007-202302140825 | ND |
| 2023-02-20 | CA5700712_004_004-202302200812 | ND |
| 2023-02-20 | CA5700712_004_006-202302200818 | ND |
| 2023-02-20 | CA5700712_004_007-202302200816 | ND |
| 2023-02-20 | CA5700712_004_005-202302200814 | ND |
| 2023-02-28 | CA5700712_004_005-202302280930 | ND |
| 2023-02-28 | CA5700712_004_006-202302280940 | ND |
| 2023-02-28 | CA5700712_004_004-202302280925 | ND |
| 2023-02-28 | CA5700712_004_007-202302280935 | ND |
| 2023-03-20 | CA5700712_004_005-202303201242 | ND |
| 2023-03-20 | CA5700712_004_006-202303201246 | ND |
| 2023-03-20 | CA5700712_011_011-202303201252 | ND |
| 2023-04-12 | CA5700712_004_005-202304120935 | ND |
| 2023-04-12 | CA5700712_004_006-202304120945 | ND |
| 2023-04-12 | CA5700712_011_011-202304120950 | ND |
| 2023-05-08 | CA5700712_011_011-202305081045 | ND |
| 2023-05-08 | CA5700712_001_001-202305080900 | 36.0 ppb |
| 2023-05-08 | CA5700712_004_004-202305081035 | 4.10 ppb |
| 2023-05-08 | CA5700712_004_006-202305081041 | ND |
| 2023-05-08 | CA5700712_004_007-202305081039 | 4.50 ppb |
| 2023-05-08 | CA5700712_004_005-202305081037 | ND |
| 2023-05-08 | CA5700712_050_050-202305081020 | 51.6 ppb |
| 2023-06-13 | CA5700712_004_006-202306130932 | ND |
| 2023-06-13 | CA5700712_004_005-202306130927 | ND |
| 2023-06-13 | CA5700712_011_011-202306130934 | ND |
| 2023-07-11 | CA5700712_004_005-202307110928 | ND |
| 2023-07-11 | CA5700712_011_011-202307110937 | ND |
| 2023-07-11 | CA5700712_004_006-202307110933 | 5.30 ppb |
| 2023-08-03 | CA5700712_050_050-202308031050 | 51.0 ppb |
| 2023-08-07 | CA5700712_001_001-202308070900 | 34.0 ppb |
| 2023-09-07 | CA5700712_004_006-202309071203 | ND |
| 2023-09-07 | CA5700712_011_011-202309071206 | ND |
| 2023-09-07 | CA5700712_004_005-202309071157 | ND |
| 2023-10-11 | CA5700712_004_005-202310111026 | ND |
| 2023-10-11 | CA5700712_004_007-202310111030 | ND |
| 2023-10-11 | CA5700712_011_011-202310111033 | ND |
| 2023-11-08 | CA5700712_001_001-202311080850 | 35.0 ppb |
| 2023-11-08 | CA5700712_004_004-202311081028 | 4.60 ppb |
| 2023-11-08 | CA5700712_050_050-202311080940 | 52.0 ppb |
| 2023-11-08 | CA5700712_011_011-202311081050 | ND |
| 2023-11-08 | CA5700712_004_005-202311081030 | ND |
| 2023-11-08 | CA5700712_004_006-202311081040 | ND |
| 2023-11-08 | CA5700712_004_007-202311081034 | 5.40 ppb |
| 2023-12-06 | CA5700712_004_007-202312060917 | ND |
| 2023-12-06 | CA5700712_011_011-202312060925 | ND |
| 2023-12-06 | CA5700712_004_005-202312060911 | ND |