Arsenic
Rio Cosumnes Correctional Center [sws]
Arsenic is a potent carcinogen and common contaminant in drinking water. Arsenic causes thousands of cases of cancer each year in the U.S. Click here to read more about arsenic.
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 | 21.5 ppb | 25 | 25 | 3.10 ppb - 49.0 ppb |
| 2019 | 21.0 ppb | 25 | 25 | 4.00 ppb - 50.0 ppb |
| 2020 | 21.6 ppb | 42 | 40 | ND - 48.0 ppb |
| 2021 | 24.6 ppb | 29 | 28 | ND - 50.0 ppb |
| 2022 | 26.6 ppb | 33 | 27 | ND - 50.0 ppb |
| 2023 | 26.6 ppb | 33 | 32 | ND - 50.0 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.004 ppb
The EWG Health Guideline of 0.004 ppb for arsenic 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.
EPA Maximum Contaminant
Level (MCL): 10 ppb
The legal limit for arsenic, established in 2001, was based on costs for arsenic removal, as calculated at the time that the standard was set. This limit does not fully protect against the risk of cancer due to arsenic exposure.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-01-16 | CA3400229_008_008-201801160928 | 4.90 ppb |
| 2018-01-16 | CA3400229_011_011-201801160929 | 37.0 ppb |
| 2018-02-13 | CA3400229_008_008-201802130858 | 7.00 ppb |
| 2018-02-13 | CA3400229_011_011-201802130900 | 35.0 ppb |
| 2018-03-26 | CA3400229_008_008-201803260858 | 4.30 ppb |
| 2018-03-26 | CA3400229_011_011-201803260857 | 39.0 ppb |
| 2018-04-16 | CA3400229_008_008-201804161204 | 4.10 ppb |
| 2018-04-16 | CA3400229_011_011-201804161206 | 35.0 ppb |
| 2018-05-14 | CA3400229_008_008-201805140940 | 4.20 ppb |
| 2018-05-14 | CA3400229_011_011-201805140935 | 35.0 ppb |
| 2018-06-19 | CA3400229_011_011-201806191324 | 33.0 ppb |
| 2018-06-19 | CA3400229_008_008-201806191326 | 3.10 ppb |
| 2018-07-18 | CA3400229_011_011-201807181211 | 33.0 ppb |
| 2018-07-18 | CA3400229_008_008-201807181204 | 3.90 ppb |
| 2018-08-21 | CA3400229_003_003-201808211058 | 44.0 ppb |
| 2018-08-27 | CA3400229_011_011-201808270852 | 49.0 ppb |
| 2018-08-27 | CA3400229_008_008-201808270854 | 5.00 ppb |
| 2018-09-17 | CA3400229_008_008-201809170810 | 5.80 ppb |
| 2018-09-17 | CA3400229_011_011-201809170809 | 47.0 ppb |
| 2018-10-17 | CA3400229_008_008-201810171047 | 4.70 ppb |
| 2018-10-17 | CA3400229_011_011-201810171048 | 30.0 ppb |
| 2018-11-21 | CA3400229_008_008-201811210757 | 4.60 ppb |
| 2018-11-21 | CA3400229_011_011-201811210756 | 31.0 ppb |
| 2018-12-19 | CA3400229_011_011-201812190745 | 33.0 ppb |
| 2018-12-19 | CA3400229_008_008-201812190746 | 5.30 ppb |
| 2019-01-29 | CA3400229_008_008-201901290905 | 5.50 ppb |
| 2019-01-29 | CA3400229_011_011-201901290901 | 13.0 ppb |
| 2019-02-14 | CA3400229_001_001-201902140809 | 50.0 ppb |
| 2019-02-19 | CA3400229_011_011-201902191036 | 34.0 ppb |
| 2019-02-19 | CA3400229_008_008-201902191034 | 6.20 ppb |
| 2019-03-19 | CA3400229_008_008-201903191340 | 5.90 ppb |
| 2019-03-19 | CA3400229_011_011-201903191336 | 32.0 ppb |
| 2019-04-18 | CA3400229_008_008-201904181003 | 7.20 ppb |
| 2019-04-18 | CA3400229_011_011-201904181001 | 34.0 ppb |
| 2019-05-21 | CA3400229_011_011-201905210908 | 33.0 ppb |
| 2019-05-21 | CA3400229_008_008-201905210905 | 5.40 ppb |
| 2019-06-17 | CA3400229_008_008-201906171314 | 5.60 ppb |
| 2019-06-17 | CA3400229_011_011-201906171315 | 32.0 ppb |
| 2019-07-09 | CA3400229_011_011-201907091312 | 33.0 ppb |
| 2019-07-09 | CA3400229_008_008-201907091317 | 5.30 ppb |
| 2019-08-22 | CA3400229_008_008-201908221211 | 5.10 ppb |
| 2019-08-22 | CA3400229_011_011-201908221222 | 32.0 ppb |
| 2019-09-09 | CA3400229_011_011-201909090938 | 33.0 ppb |
| 2019-09-09 | CA3400229_008_008-201909090936 | 5.80 ppb |
| 2019-10-01 | CA3400229_011_011-201910011213 | 35.0 ppb |
| 2019-10-01 | CA3400229_008_008-201910011215 | 4.60 ppb |
| 2019-12-11 | CA3400229_008_008-201912111215 | 7.20 ppb |
| 2019-12-11 | CA3400229_008_008-201912111213 | 4.00 ppb |
| 2019-12-11 | CA3400229_001_001-201912111212 | 50.0 ppb |
| 2019-12-11 | CA3400229_001_001-201912111217 | 46.0 ppb |
| 2020-01-07 | CA3400229_001_001-202001070930 | 34.0 ppb |
| 2020-01-07 | CA3400229_008_008-202001070938 | 4.90 ppb |
| 2020-01-07 | CA3400229_008_008-202001070945 | 6.20 ppb |
| 2020-02-20 | CA3400229_008_008-202002200939 | 3.30 ppb |
| 2020-02-20 | CA3400229_011_011-202002200939 | 33.0 ppb |
| 2020-02-20 | CA3400229_008_008-202002200949 | 8.30 ppb |
| 2020-02-20 | CA3400229_011_011-202002200947 | 48.0 ppb |
| 2020-03-25 | CA3400229_008_008-202003250720 | 2.50 ppb |
| 2020-03-25 | CA3400229_011_011-202003250716 | 37.0 ppb |
| 2020-04-13 | CA3400229_008_008-202004130910 | 3.20 ppb |
| 2020-04-13 | CA3400229_011_011-202004130910 | 41.0 ppb |
| 2020-05-18 | CA3400229_011_011-202005181430 | 40.0 ppb |
| 2020-05-18 | CA3400229_008_008-202005181435 | 2.50 ppb |
| 2020-05-18 | CA3400229_011_011-202005181435 | 42.0 ppb |
| 2020-05-18 | CA3400229_008_008-202005181430 | 2.90 ppb |
| 2020-06-11 | CA3400229_011_011-202006111018 | 36.0 ppb |
| 2020-06-11 | CA3400229_008_008-202006111018 | 3.10 ppb |
| 2020-06-11 | CA3400229_011_011-202006111020 | 38.0 ppb |
| 2020-06-11 | CA3400229_008_008-202006111020 | ND |
| 2020-07-15 | CA3400229_011_011-202007150856 | 42.0 ppb |
| 2020-07-15 | CA3400229_008_008-202007150852 | 3.40 ppb |
| 2020-08-25 | CA3400229_011_011-202008251318 | 41.0 ppb |
| 2020-08-25 | CA3400229_011_011-202008251320 | 44.0 ppb |
| 2020-08-25 | CA3400229_008_008-202008251318 | 4.30 ppb |
| 2020-08-25 | CA3400229_008_008-202008251320 | 3.70 ppb |
| 2020-09-17 | CA3400229_008_008-202009171150 | 4.70 ppb |
| 2020-09-17 | CA3400229_008_008-202009171155 | 4.10 ppb |
| 2020-09-17 | CA3400229_011_011-202009171148 | 43.0 ppb |
| 2020-09-17 | CA3400229_011_011-202009171153 | 40.0 ppb |
| 2020-10-20 | CA3400229_008_008-202010201036 | 2.80 ppb |
| 2020-10-20 | CA3400229_011_011-202010201035 | 38.0 ppb |
| 2020-10-20 | CA3400229_011_011-202010201053 | 40.0 ppb |
| 2020-10-20 | CA3400229_008_008-202010201055 | ND |
| 2020-11-03 | CA3400229_008_008-202011030925 | 2.30 ppb |
| 2020-11-03 | CA3400229_008_008-202011031018 | 3.60 ppb |
| 2020-11-03 | CA3400229_011_011-202011030925 | 42.0 ppb |
| 2020-11-03 | CA3400229_011_011-202011031018 | 41.0 ppb |
| 2020-11-09 | CA3400229_002_002-202011091503 | 27.0 ppb |
| 2020-12-09 | CA3400229_011_011-202012090930 | 47.0 ppb |
| 2020-12-09 | CA3400229_008_008-202012090930 | 2.70 ppb |
| 2020-12-09 | CA3400229_008_008-202012090933 | 3.70 ppb |
| 2020-12-09 | CA3400229_011_011-202012090933 | 42.0 ppb |
| 2021-01-07 | CA3400229_011_011-202101071110 | 44.0 ppb |
| 2021-01-07 | CA3400229_008_008-202101071108 | 4.00 ppb |
| 2021-01-07 | CA3400229_008_008-202101071111 | 4.80 ppb |
| 2021-01-07 | CA3400229_011_011-202101071107 | 46.0 ppb |
| 2021-02-03 | CA3400229_008_008-202102031114 | 3.00 ppb |
| 2021-02-03 | CA3400229_008_008-202102031110 | 3.50 ppb |
| 2021-02-03 | CA3400229_011_011-202102031112 | 42.0 ppb |
| 2021-02-03 | CA3400229_011_011-202102031109 | 50.0 ppb |
| 2021-03-15 | CA3400229_011_011-202103151032 | 44.0 ppb |
| 2021-03-15 | CA3400229_008_008-202103151120 | 5.20 ppb |
| 2021-04-21 | CA3400229_008_008-202104211302 | 2.80 ppb |
| 2021-04-21 | CA3400229_011_011-202104211301 | 42.0 ppb |
| 2021-04-21 | CA3400229_008_008-202104211258 | 4.40 ppb |
| 2021-04-21 | CA3400229_011_011-202104211202 | 46.0 ppb |
| 2021-05-17 | CA3400229_011_011-202105171510 | 38.0 ppb |
| 2021-05-17 | CA3400229_011_011-202105171516 | 41.0 ppb |
| 2021-05-17 | CA3400229_008_008-202105171509 | 3.00 ppb |
| 2021-05-17 | CA3400229_008_008-202105171515 | 7.10 ppb |
| 2021-06-14 | CA3400229_008_008-202106141019 | 3.20 ppb |
| 2021-06-14 | CA3400229_011_011-202106141017 | 47.0 ppb |
| 2021-06-14 | CA3400229_008_008-202106141011 | 9.70 ppb |
| 2021-06-14 | CA3400229_011_011-202106141010 | 43.0 ppb |
| 2021-08-02 | CA3400229_003_003-202108021227 | 42.0 ppb |
| 2021-08-12 | CA3400229_011_011-202108120952 | 39.0 ppb |
| 2021-08-12 | CA3400229_008_008-202108120952 | 4.80 ppb |
| 2021-10-19 | CA3400229_008_008-202110191325 | ND |
| 2021-11-15 | CA3400229_011_011-202111151143 | 42.0 ppb |
| 2021-11-15 | CA3400229_005_005-202111151138 | 48.0 ppb |
| 2021-12-16 | CA3400229_008_008-202112160944 | 5.10 ppb |
| 2022-01-25 | CA3400229_005_005-202201251235 | 42.0 ppb |
| 2022-01-25 | CA3400229_008_008-202201251235 | ND |
| 2022-01-25 | CA3400229_011_011-202201251251 | 50.0 ppb |
| 2022-02-15 | CA3400229_005_005-202202151122 | 42.0 ppb |
| 2022-02-15 | CA3400229_008_008-202202151122 | ND |
| 2022-03-21 | CA3400229_005_005-202203211118 | 42.0 ppb |
| 2022-03-21 | CA3400229_008_008-202203211118 | ND |
| 2022-04-20 | CA3400229_005_005-202204201100 | 45.0 ppb |
| 2022-04-20 | CA3400229_008_008-202204201100 | 3.60 ppb |
| 2022-05-18 | CA3400229_005_005-202205180835 | 41.0 ppb |
| 2022-05-18 | CA3400229_011_011-202205180835 | 44.0 ppb |
| 2022-05-18 | CA3400229_008_008-202205180835 | ND |
| 2022-06-27 | CA3400229_005_005-202206271124 | 42.0 ppb |
| 2022-06-27 | CA3400229_008_008-202206271125 | 2.00 ppb |
| 2022-06-27 | CA3400229_011_011-202206271121 | 40.0 ppb |
| 2022-07-11 | CA3400229_005_005-202207110945 | 47.0 ppb |
| 2022-07-11 | CA3400229_008_008-202207110945 | 2.40 ppb |
| 2022-07-11 | CA3400229_011_011-202207110945 | 41.0 ppb |
| 2022-08-09 | CA3400229_005_005-202208091113 | 45.0 ppb |
| 2022-08-09 | CA3400229_008_008-202208091113 | 2.90 ppb |
| 2022-08-09 | CA3400229_011_011-202208091110 | 45.0 ppb |
| 2022-09-13 | CA3400229_008_008-202209130937 | 2.30 ppb |
| 2022-09-13 | CA3400229_011_011-202209130935 | 41.0 ppb |
| 2022-09-13 | CA3400229_005_005-202209130937 | 43.0 ppb |
| 2022-10-11 | CA3400229_008_008-202210111105 | ND |
| 2022-10-11 | CA3400229_011_011-202210111100 | 43.0 ppb |
| 2022-10-11 | CA3400229_005_005-202210111105 | 38.0 ppb |
| 2022-11-07 | CA3400229_008_008-202211071210 | 3.90 ppb |
| 2022-11-17 | CA3400229_008_008-202211171352 | ND |
| 2022-11-17 | CA3400229_005_005-202211171350 | 43.0 ppb |
| 2022-11-17 | CA3400229_011_011-202211171355 | 48.0 ppb |
| 2022-12-15 | CA3400229_005_005-202212151024 | 37.0 ppb |
| 2022-12-15 | CA3400229_008_008-202212151025 | 3.30 ppb |
| 2023-01-11 | CA3400229_008_008-202301111015 | ND |
| 2023-01-11 | CA3400229_005_005-202301111015 | 34.0 ppb |
| 2023-01-11 | CA3400229_011_011-202301111010 | 49.0 ppb |
| 2023-02-14 | CA3400229_008_008-202302141100 | 3.40 ppb |
| 2023-02-14 | CA3400229_005_005-202302141100 | 38.0 ppb |
| 2023-03-28 | CA3400229_005_005-202303280935 | 40.0 ppb |
| 2023-03-28 | CA3400229_008_008-202303280935 | 3.00 ppb |
| 2023-04-11 | CA3400229_005_005-202304111006 | 37.0 ppb |
| 2023-04-11 | CA3400229_008_008-202304111006 | 4.80 ppb |
| 2023-04-11 | CA3400229_011_011-202304111005 | 50.0 ppb |
| 2023-05-11 | CA3400229_005_005-202305111305 | 38.0 ppb |
| 2023-05-11 | CA3400229_008_008-202305111300 | 5.00 ppb |
| 2023-06-06 | CA3400229_008_008-202306060750 | 3.20 ppb |
| 2023-06-06 | CA3400229_011_011-202306060915 | 47.0 ppb |
| 2023-06-06 | CA3400229_005_005-202306060750 | 36.0 ppb |
| 2023-07-12 | CA3400229_005_005-202307121323 | 35.0 ppb |
| 2023-07-12 | CA3400229_008_008-202307121325 | 4.10 ppb |
| 2023-07-12 | CA3400229_011_011-202307121321 | 33.0 ppb |
| 2023-08-07 | CA3400229_008_008-202308070925 | 3.10 ppb |
| 2023-08-07 | CA3400229_011_011-202308070910 | 40.0 ppb |
| 2023-09-11 | CA3400229_005_005-202309111133 | 35.0 ppb |
| 2023-09-11 | CA3400229_008_008-202309111138 | 3.50 ppb |
| 2023-09-11 | CA3400229_011_011-202309111130 | 42.0 ppb |
| 2023-10-18 | CA3400229_011_011-202310181208 | 45.0 ppb |
| 2023-10-18 | CA3400229_005_005-202310181211 | 33.0 ppb |
| 2023-10-18 | CA3400229_008_008-202310181211 | 3.50 ppb |
| 2023-11-07 | CA3400229_002_002-202311070840 | 39.0 ppb |
| 2023-11-16 | CA3400229_005_005-202311160920 | 39.0 ppb |
| 2023-11-16 | CA3400229_008_008-202311160925 | 4.00 ppb |
| 2023-11-16 | CA3400229_011_011-202311160940 | 44.0 ppb |
| 2023-12-18 | CA3400229_005_005-202312181150 | 34.0 ppb |
| 2023-12-18 | CA3400229_008_008-202312181159 | 2.90 ppb |
| 2023-12-18 | CA3400229_011_011-202312181142 | 48.0 ppb |