Arsenic
Cws - Upper Bodfish Water System
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 | 11.8 ppb | 35 | 20 | ND - 31.6 ppb |
| 2019 | 13.2 ppb | 38 | 23 | ND - 33.1 ppb |
| 2020 | 12.4 ppb | 36 | 23 | ND - 30.8 ppb |
| 2021 | 10.9 ppb | 32 | 20 | ND - 33.0 ppb |
| 2022 | 13.9 ppb | 52 | 37 | ND - 28.7 ppb |
| 2023 | 11.2 ppb | 35 | 25 | ND - 28.0 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 |
|---|---|---|
| 2018-01-17 | CA1510026_007_007-201801171059 | ND |
| 2018-01-17 | CA1510026_006_006-201801171104 | 14.2 ppb |
| 2018-02-21 | CA1510026_004_004-201802211334 | 8.58 ppb |
| 2018-02-21 | CA1510026_006_006-201802211314 | 14.4 ppb |
| 2018-02-21 | CA1510026_007_007-201802211325 | ND |
| 2018-02-21 | CA1510026_005_005-201802211343 | 24.0 ppb |
| 2018-03-13 | CA1510026_006_006-201803131300 | 27.4 ppb |
| 2018-03-13 | CA1510026_007_007-201803131316 | ND |
| 2018-04-04 | CA1510026_007_007-201804041042 | ND |
| 2018-04-04 | CA1510026_006_006-201804041017 | 20.9 ppb |
| 2018-05-31 | CA1510026_005_005-201805311327 | 31.6 ppb |
| 2018-05-31 | CA1510026_006_006-201805311303 | 22.9 ppb |
| 2018-05-31 | CA1510026_004_004-201805311322 | 12.0 ppb |
| 2018-05-31 | CA1510026_007_007-201805311333 | ND |
| 2018-06-12 | CA1510026_006_006-201806121422 | 21.7 ppb |
| 2018-06-12 | CA1510026_007_007-201806121429 | ND |
| 2018-07-16 | CA1510026_006_006-201807161306 | 21.2 ppb |
| 2018-07-16 | CA1510026_007_007-201807161325 | ND |
| 2018-08-01 | CA1510026_004_004-201808011356 | 22.7 ppb |
| 2018-08-01 | CA1510026_006_006-201808011225 | 19.5 ppb |
| 2018-08-01 | CA1510026_005_005-201808011401 | 27.2 ppb |
| 2018-08-01 | CA1510026_007_007-201808011408 | ND |
| 2018-08-08 | CA1510026_007_007-201808081446 | ND |
| 2018-08-13 | CA1510026_DST_902-201808131227 | ND |
| 2018-08-13 | CA1510026_DST_901-201808131219 | ND |
| 2018-09-06 | CA1510026_006_006-201809061331 | 18.1 ppb |
| 2018-09-06 | CA1510026_007_007-201809061336 | ND |
| 2018-10-08 | CA1510026_006_006-201810081229 | 16.4 ppb |
| 2018-10-08 | CA1510026_007_007-201810081224 | ND |
| 2018-11-14 | CA1510026_005_005-201811141328 | 28.6 ppb |
| 2018-11-14 | CA1510026_006_006-201811141335 | 29.5 ppb |
| 2018-11-14 | CA1510026_004_004-201811141322 | 7.90 ppb |
| 2018-11-14 | CA1510026_007_007-201811141347 | ND |
| 2018-12-10 | CA1510026_006_006-201812101105 | 23.5 ppb |
| 2018-12-10 | CA1510026_007_007-201812101100 | ND |
| 2019-01-22 | CA1510026_006_006-201901221102 | 21.8 ppb |
| 2019-01-22 | CA1510026_007_007-201901221110 | ND |
| 2019-02-06 | CA1510026_007_007-201902061227 | ND |
| 2019-02-06 | CA1510026_006_006-201902061236 | 22.5 ppb |
| 2019-02-06 | CA1510026_005_005-201902061255 | 27.8 ppb |
| 2019-02-06 | CA1510026_004_004-201902061245 | 9.87 ppb |
| 2019-02-25 | CA1510026_005_005-201902251210 | 26.0 ppb |
| 2019-02-25 | CA1510026_004_004-201902251200 | 11.0 ppb |
| 2019-03-06 | CA1510026_007_007-201903061455 | ND |
| 2019-03-27 | CA1510026_007_007-201903271045 | ND |
| 2019-04-09 | CA1510026_007_007-201904091343 | ND |
| 2019-04-09 | CA1510026_006_006-201904091320 | 24.1 ppb |
| 2019-05-06 | CA1510026_006_006-201905061128 | 21.1 ppb |
| 2019-05-06 | CA1510026_007_007-201905061133 | ND |
| 2019-05-06 | CA1510026_004_004-201905061120 | 8.60 ppb |
| 2019-05-06 | CA1510026_005_005-201905061125 | 27.0 ppb |
| 2019-06-05 | CA1510026_006_006-201906051200 | 26.8 ppb |
| 2019-06-05 | CA1510026_007_007-201906051153 | ND |
| 2019-07-22 | CA1510026_006_006-201907221115 | 26.9 ppb |
| 2019-07-22 | CA1510026_007_007-201907221120 | ND |
| 2019-08-07 | CA1510026_005_005-201908071340 | 27.9 ppb |
| 2019-08-07 | CA1510026_007_007-201908071345 | ND |
| 2019-08-07 | CA1510026_006_006-201908071333 | 29.2 ppb |
| 2019-09-11 | CA1510026_006_006-201909110940 | 16.0 ppb |
| 2019-09-11 | CA1510026_007_007-201909110950 | ND |
| 2019-10-15 | CA1510026_007_007-201910151215 | ND |
| 2019-10-16 | CA1510026_006_006-201910161245 | 19.7 ppb |
| 2019-10-16 | CA1510026_007_007-201910161248 | ND |
| 2019-11-13 | CA1510026_007_007-201911130945 | ND |
| 2019-11-13 | CA1510026_004_004-201911130939 | 10.1 ppb |
| 2019-11-13 | CA1510026_005_005-201911130941 | 33.1 ppb |
| 2019-11-13 | CA1510026_006_006-201911130936 | 30.7 ppb |
| 2019-11-19 | CA1510026_007_007-201911191352 | ND |
| 2019-11-19 | CA1510026_005_005-201911191348 | 29.7 ppb |
| 2019-11-19 | CA1510026_004_004-201911191345 | 9.08 ppb |
| 2019-11-19 | CA1510026_006_006-201911191350 | 16.7 ppb |
| 2019-12-04 | CA1510026_007_007-201912041240 | ND |
| 2019-12-04 | CA1510026_006_006-201912041246 | 26.8 ppb |
| 2020-01-13 | CA1510026_007_007-202001131200 | ND |
| 2020-01-13 | CA1510026_006_006-202001131205 | 23.5 ppb |
| 2020-02-04 | CA1510026_007_007-202002041250 | ND |
| 2020-02-04 | CA1510026_004_004-202002041303 | 9.57 ppb |
| 2020-02-04 | CA1510026_006_006-202002041257 | 18.9 ppb |
| 2020-02-04 | CA1510026_005_005-202002041310 | 29.6 ppb |
| 2020-03-11 | CA1510026_006_006-202003111429 | 17.8 ppb |
| 2020-03-11 | CA1510026_007_007-202003111424 | ND |
| 2020-04-01 | CA1510026_006_006-202004011345 | 16.8 ppb |
| 2020-04-01 | CA1510026_007_007-202004011333 | ND |
| 2020-05-06 | CA1510026_006_006-202005060759 | 22.0 ppb |
| 2020-05-06 | CA1510026_004_004-202005060811 | 8.11 ppb |
| 2020-05-06 | CA1510026_005_005-202005060816 | 29.0 ppb |
| 2020-05-06 | CA1510026_007_007-202005060748 | ND |
| 2020-06-08 | CA1510026_007_007-202006081115 | ND |
| 2020-06-08 | CA1510026_006_006-202006081125 | 18.6 ppb |
| 2020-07-20 | CA1510026_007_007-202007201303 | ND |
| 2020-07-20 | CA1510026_006_006-202007201255 | 17.1 ppb |
| 2020-08-05 | CA1510026_005_005-202008051201 | 28.7 ppb |
| 2020-08-05 | CA1510026_007_007-202008051121 | ND |
| 2020-08-05 | CA1510026_004_004-202008051155 | 9.00 ppb |
| 2020-08-05 | CA1510026_006_006-202008051150 | 18.2 ppb |
| 2020-08-18 | CA1510026_005_005-202008181011 | 29.3 ppb |
| 2020-08-18 | CA1510026_004_004-202008181007 | 7.60 ppb |
| 2020-08-18 | CA1510026_006_006-202008181002 | 18.5 ppb |
| 2020-08-18 | CA1510026_007_007-202008180955 | ND |
| 2020-09-02 | CA1510026_006_006-202009021209 | 21.0 ppb |
| 2020-09-02 | CA1510026_007_007-202009021202 | ND |
| 2020-10-20 | CA1510026_006_006-202010201129 | 22.8 ppb |
| 2020-10-20 | CA1510026_007_007-202010201139 | ND |
| 2020-11-12 | CA1510026_004_004-202011121142 | 11.3 ppb |
| 2020-11-12 | CA1510026_005_005-202011121213 | 30.8 ppb |
| 2020-11-12 | CA1510026_006_006-202011121136 | 18.8 ppb |
| 2020-11-12 | CA1510026_007_007-202011121218 | ND |
| 2020-12-09 | CA1510026_006_006-202012091112 | 20.1 ppb |
| 2020-12-09 | CA1510026_007_007-202012091118 | ND |
| 2021-01-12 | CA1510026_006_006-202101120931 | 16.1 ppb |
| 2021-01-12 | CA1510026_007_007-202101120942 | ND |
| 2021-02-04 | CA1510026_004_004-202102041214 | 8.80 ppb |
| 2021-02-04 | CA1510026_005_005-202102041218 | 26.0 ppb |
| 2021-02-04 | CA1510026_007_007-202102041207 | ND |
| 2021-02-04 | CA1510026_006_006-202102041152 | 14.0 ppb |
| 2021-03-02 | CA1510026_006_006-202103020823 | 15.0 ppb |
| 2021-03-02 | CA1510026_007_007-202103020814 | ND |
| 2021-04-06 | CA1510026_007_007-202104061252 | ND |
| 2021-04-06 | CA1510026_006_006-202104061155 | 19.0 ppb |
| 2021-05-04 | CA1510026_006_006-202105041349 | 20.0 ppb |
| 2021-05-04 | CA1510026_004_004-202105041400 | 2.40 ppb |
| 2021-05-04 | CA1510026_005_005-202105041405 | 33.0 ppb |
| 2021-05-04 | CA1510026_007_007-202105041342 | ND |
| 2021-06-01 | CA1510026_007_007-202106011343 | ND |
| 2021-06-01 | CA1510026_006_006-202106011349 | 21.0 ppb |
| 2021-07-13 | CA1510026_006_006-202107131143 | 16.0 ppb |
| 2021-07-13 | CA1510026_007_007-202107131158 | ND |
| 2021-08-05 | CA1510026_004_004-202108051342 | 8.80 ppb |
| 2021-08-05 | CA1510026_005_005-202108051347 | 26.0 ppb |
| 2021-08-05 | CA1510026_006_006-202108051331 | 17.0 ppb |
| 2021-08-05 | CA1510026_007_007-202108051336 | ND |
| 2021-09-23 | CA1510026_007_007-202109231341 | ND |
| 2021-09-23 | CA1510026_006_006-202109231334 | 15.0 ppb |
| 2021-10-07 | CA1510026_006_006-202110071442 | 18.0 ppb |
| 2021-10-07 | CA1510026_007_007-202110071434 | ND |
| 2021-11-18 | CA1510026_004_004-202111181138 | 11.0 ppb |
| 2021-11-18 | CA1510026_005_005-202111181143 | 28.0 ppb |
| 2021-11-18 | CA1510026_006_006-202111181121 | 17.0 ppb |
| 2021-11-18 | CA1510026_007_007-202111181126 | ND |
| 2021-12-07 | CA1510026_007_007-202112071327 | ND |
| 2021-12-07 | CA1510026_006_006-202112071321 | 16.0 ppb |
| 2022-01-11 | CA1510026_004_004-202201111011 | 10.00 ppb |
| 2022-01-11 | CA1510026_005_005-202201111017 | 28.0 ppb |
| 2022-01-18 | CA1510026_006_006-202201181339 | 16.0 ppb |
| 2022-01-18 | CA1510026_007_007-202201181324 | ND |
| 2022-02-17 | CA1510026_004_004-202202170920 | 8.70 ppb |
| 2022-02-17 | CA1510026_006_006-202202170932 | 17.0 ppb |
| 2022-02-17 | CA1510026_007_007-202202170956 | ND |
| 2022-02-17 | CA1510026_004_004-202202170920 | 9.40 ppb |
| 2022-02-17 | CA1510026_005_005-202202170950 | 26.0 ppb |
| 2022-02-24 | CA1510026_005_005-202202241144 | 27.0 ppb |
| 2022-03-08 | CA1510026_004_004-202203081120 | 10.00 ppb |
| 2022-03-08 | CA1510026_006_006-202203081116 | 16.0 ppb |
| 2022-03-08 | CA1510026_005_005-202203081123 | 27.0 ppb |
| 2022-03-08 | CA1510026_007_007-202203081107 | ND |
| 2022-03-15 | CA1510026_006_006-202203150927 | 15.0 ppb |
| 2022-03-15 | CA1510026_007_007-202203150932 | 1.80 ppb |
| 2022-04-06 | CA1510026_006_006-202204061420 | 21.5 ppb |
| 2022-04-06 | CA1510026_007_007-202204061425 | ND |
| 2022-04-19 | CA1510026_005_005-202204191306 | 26.0 ppb |
| 2022-04-19 | CA1510026_006_006-202204191317 | 18.9 ppb |
| 2022-04-19 | CA1510026_004_004-202204191302 | 9.80 ppb |
| 2022-04-19 | CA1510026_007_007-202204191312 | ND |
| 2022-05-03 | CA1510026_004_004-202205031159 | 10.4 ppb |
| 2022-05-03 | CA1510026_005_005-202205031204 | 27.2 ppb |
| 2022-05-03 | CA1510026_006_006-202205031153 | 25.0 ppb |
| 2022-05-03 | CA1510026_006_006-202205031153 | 25.6 ppb |
| 2022-05-03 | CA1510026_005_005-202205031204 | 27.1 ppb |
| 2022-05-03 | CA1510026_004_004-202205031159 | 9.90 ppb |
| 2022-05-03 | CA1510026_007_007-202205031143 | ND |
| 2022-05-03 | CA1510026_007_007-202205031143 | ND |
| 2022-06-01 | CA1510026_006_006-202206011149 | 25.1 ppb |
| 2022-06-01 | CA1510026_007_007-202206011143 | ND |
| 2022-06-01 | CA1510026_006_006-202206011149 | 24.9 ppb |
| 2022-07-13 | CA1510026_006_006-202207131349 | 25.9 ppb |
| 2022-07-13 | CA1510026_007_007-202207131404 | ND |
| 2022-07-13 | CA1510026_006_006-202207131349 | 28.7 ppb |
| 2022-08-10 | CA1510026_006_006-202208101400 | 25.4 ppb |
| 2022-08-10 | CA1510026_005_005-202208101411 | 25.2 ppb |
| 2022-08-10 | CA1510026_007_007-202208101424 | ND |
| 2022-08-10 | CA1510026_004_004-202208101406 | 7.50 ppb |
| 2022-08-10 | CA1510026_006_006-202208101400 | 25.6 ppb |
| 2022-09-14 | CA1510026_006_006-202209140902 | 23.0 ppb |
| 2022-09-14 | CA1510026_007_007-202209140910 | ND |
| 2022-10-06 | CA1510026_007_007-202210061047 | ND |
| 2022-10-11 | CA1510026_006_006-202210111327 | 20.8 ppb |
| 2022-10-11 | CA1510026_007_007-202210111320 | ND |
| 2022-11-08 | CA1510026_004_004-202211081309 | 7.40 ppb |
| 2022-11-08 | CA1510026_007_007-202211081254 | ND |
| 2022-11-08 | CA1510026_005_005-202211081315 | 24.0 ppb |
| 2022-11-08 | CA1510026_006_006-202211081301 | 19.0 ppb |
| 2022-12-06 | CA1510026_007_007-202212061115 | ND |
| 2022-12-06 | CA1510026_006_006-202212061122 | 24.4 ppb |
| 2023-01-17 | CA1510026_007_007-202301171100 | ND |
| 2023-01-18 | CA1510026_006_006-202301181052 | 23.0 ppb |
| 2023-02-01 | CA1510026_007_007-202302011515 | ND |
| 2023-02-06 | CA1510026_005_005-202302061217 | 26.0 ppb |
| 2023-02-06 | CA1510026_005_005-202302061217 | 26.2 ppb |
| 2023-02-06 | CA1510026_006_006-202302061206 | 20.8 ppb |
| 2023-02-06 | CA1510026_006_006-202302061206 | 20.8 ppb |
| 2023-02-06 | CA1510026_004_004-202302061217 | 9.60 ppb |
| 2023-02-06 | CA1510026_007_007-202302061158 | ND |
| 2023-03-06 | CA1510026_006_006-202303060954 | 13.9 ppb |
| 2023-03-06 | CA1510026_007_007-202303061010 | ND |
| 2023-04-11 | CA1510026_006_006-202304111356 | 12.8 ppb |
| 2023-04-12 | CA1510026_007_007-202304121220 | ND |
| 2023-05-08 | CA1510026_005_005-202305081144 | 23.9 ppb |
| 2023-05-08 | CA1510026_006_006-202305081127 | 14.0 ppb |
| 2023-05-08 | CA1510026_004_004-202305081140 | 8.80 ppb |
| 2023-05-08 | CA1510026_007_007-202305081135 | ND |
| 2023-06-06 | CA1510026_006_006-202306061147 | 15.8 ppb |
| 2023-06-06 | CA1510026_007_007-202306061152 | ND |
| 2023-07-11 | CA1510026_007_007-202307111418 | ND |
| 2023-07-12 | CA1510026_006_006-202307121145 | 13.8 ppb |
| 2023-08-09 | CA1510026_004_004-202308091333 | 11.0 ppb |
| 2023-08-09 | CA1510026_005_005-202308091336 | 23.4 ppb |
| 2023-08-09 | CA1510026_006_006-202308091323 | 15.4 ppb |
| 2023-08-09 | CA1510026_007_007-202308091347 | 1.10 ppb |
| 2023-09-05 | CA1510026_007_007-202309051311 | ND |
| 2023-09-05 | CA1510026_006_006-202309051303 | 16.0 ppb |
| 2023-10-03 | CA1510026_007_007-202310031050 | 2.10 ppb |
| 2023-10-03 | CA1510026_006_006-202310031055 | 17.0 ppb |
| 2023-11-06 | CA1510026_006_006-202311061436 | 18.7 ppb |
| 2023-11-13 | CA1510026_004_004-202311131135 | 10.3 ppb |
| 2023-11-13 | CA1510026_005_005-202311131140 | 28.0 ppb |
| 2023-11-13 | CA1510026_007_007-202311131130 | 1.80 ppb |
| 2023-12-13 | CA1510026_007_007-202312131400 | ND |
| 2023-12-13 | CA1510026_006_006-202312131410 | 17.0 ppb |