Arsenic
Fcwwd #41/shaver Lake
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 | 0.673 ppb | 40 | 4 | ND - 9.90 ppb |
| 2019 | 1.02 ppb | 31 | 6 | ND - 7.60 ppb |
| 2020 | 0.568 ppb | 34 | 4 | ND - 5.40 ppb |
| 2021 | ND | 38 | 0 | ND |
| 2022 | 0.0818 ppb | 33 | 1 | ND - 2.70 ppb |
| 2023 | ND | 26 | 0 | ND |
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 |
|---|---|---|
| 2018-03-12 | CA1010017_001_001-201803121055 | ND |
| 2018-03-12 | CA1010017_015_015-201803121341 | ND |
| 2018-03-12 | CA1010017_005_005-201803121119 | ND |
| 2018-03-12 | CA1010017_008_008-201803121200 | ND |
| 2018-03-12 | CA1010017_014_014-201803121310 | ND |
| 2018-03-12 | CA1010017_033_033-201803121239 | ND |
| 2018-03-14 | CA1010017_004_004-201803141053 | ND |
| 2018-03-14 | CA1010017_034_034-201803140320 | ND |
| 2018-03-14 | CA1010017_062_062-201803141234 | ND |
| 2018-03-16 | CA1010017_011_011-201803161212 | ND |
| 2018-03-16 | CA1010017_012_012-201803161225 | ND |
| 2018-03-16 | CA1010017_036_036-201803161304 | ND |
| 2018-03-16 | CA1010017_006_006-201803161041 | ND |
| 2018-03-16 | CA1010017_035_035-201803161334 | ND |
| 2018-03-19 | CA1010017_044_044-201803191251 | 5.70 ppb |
| 2018-03-19 | CA1010017_009_009-201803191332 | ND |
| 2018-03-19 | CA1010017_042_042-201803191207 | ND |
| 2018-04-04 | CA1010017_044_044-201804041129 | 5.40 ppb |
| 2018-04-09 | CA1010017_033_033-201804091159 | ND |
| 2018-04-09 | CA1010017_001_001-201804091058 | ND |
| 2018-04-09 | CA1010017_004_004-201804091113 | ND |
| 2018-04-09 | CA1010017_005_005-201804091117 | ND |
| 2018-04-11 | CA1010017_008_008-201804111212 | ND |
| 2018-04-11 | CA1010017_006_006-201804111318 | ND |
| 2018-04-13 | CA1010017_062_062-201804131313 | ND |
| 2018-04-13 | CA1010017_034_034-201804131345 | ND |
| 2018-04-13 | CA1010017_014_014-201804131404 | ND |
| 2018-04-13 | CA1010017_015_015-201804131040 | ND |
| 2018-04-18 | CA1010017_011_011-201804181135 | ND |
| 2018-04-18 | CA1010017_012_012-201804181148 | ND |
| 2018-04-18 | CA1010017_036_036-201804181054 | ND |
| 2018-04-18 | CA1010017_035_035-201804181037 | ND |
| 2018-04-20 | CA1010017_009_009-201804201329 | ND |
| 2018-04-20 | CA1010017_042_042-201804201155 | ND |
| 2018-06-18 | CA1010017_044_044-201806180752 | 5.90 ppb |
| 2018-07-11 | CA1010017_070_070-201807111135 | ND |
| 2018-07-11 | CA1010017_071_071-201807111052 | ND |
| 2018-09-12 | CA1010017_044_044-201809121000 | 9.90 ppb |
| 2018-11-06 | CA1010017_070_070-201811061225 | ND |
| 2018-11-06 | CA1010017_071_071-201811061030 | ND |
| 2019-01-09 | CA1010017_071_071-201901091225 | ND |
| 2019-01-09 | CA1010017_070_070-201901091140 | ND |
| 2019-01-15 | CA1010017_037_037-201901151139 | 6.80 ppb |
| 2019-02-13 | CA1010017_070_070-201902131017 | ND |
| 2019-02-13 | CA1010017_071_071-201902131145 | ND |
| 2019-03-27 | CA1010017_044_044-201903271020 | 3.60 ppb |
| 2019-04-03 | CA1010017_071_071-201904030800 | ND |
| 2019-04-03 | CA1010017_070_070-201904030915 | ND |
| 2019-05-08 | CA1010017_070_070-201905081045 | ND |
| 2019-05-08 | CA1010017_071_071-201905081010 | ND |
| 2019-06-11 | CA1010017_070_070-201906111110 | ND |
| 2019-06-11 | CA1010017_071_071-201906111035 | ND |
| 2019-06-19 | CA1010017_040_040-201906191115 | ND |
| 2019-06-19 | CA1010017_037_037-201906191030 | ND |
| 2019-06-19 | CA1010017_041_041-201906191120 | ND |
| 2019-06-19 | CA1010017_044_044-201906191320 | 7.60 ppb |
| 2019-06-19 | CA1010017_046_046-201906191000 | ND |
| 2019-06-19 | CA1010017_058_058-201906190855 | ND |
| 2019-06-19 | CA1010017_065_065-201906190940 | ND |
| 2019-06-19 | CA1010017_059_059-201906190955 | ND |
| 2019-06-19 | CA1010017_066_066-201906190957 | ND |
| 2019-06-19 | CA1010017_043_043-201906191310 | ND |
| 2019-06-19 | CA1010017_056_056-201906190926 | ND |
| 2019-06-19 | CA1010017_057_057-201906190910 | ND |
| 2019-06-26 | CA1010017_066_066-201906261230 | ND |
| 2019-07-02 | CA1010017_071_071-201907020920 | ND |
| 2019-07-02 | CA1010017_070_070-201907021015 | ND |
| 2019-07-23 | CA1010017_044_044-201907231130 | 5.20 ppb |
| 2019-10-14 | CA1010017_044_044-201910141215 | 4.10 ppb |
| 2019-11-05 | CA1010017_044_044-201911051226 | 4.20 ppb |
| 2019-12-18 | CA1010017_038_038-201912180933 | ND |
| 2020-02-04 | CA1010017_071_071-202002041110 | ND |
| 2020-02-04 | CA1010017_070_070-202002041120 | ND |
| 2020-02-26 | CA1010017_044_044-202002261115 | 4.50 ppb |
| 2020-03-10 | CA1010017_070_070-202003101100 | ND |
| 2020-03-10 | CA1010017_071_071-202003100910 | ND |
| 2020-04-02 | CA1010017_071_071-202004021015 | ND |
| 2020-04-02 | CA1010017_070_070-202004021030 | ND |
| 2020-04-21 | CA1010017_002_002-202004210850 | ND |
| 2020-05-06 | CA1010017_048_048-202005060920 | ND |
| 2020-05-06 | CA1010017_047_047-202005061050 | ND |
| 2020-05-06 | CA1010017_049_049-202005061025 | ND |
| 2020-05-12 | CA1010017_070_070-202005121045 | ND |
| 2020-05-12 | CA1010017_071_071-202005121020 | ND |
| 2020-05-27 | CA1010017_070_070-202005271010 | ND |
| 2020-05-27 | CA1010017_071_071-202005270950 | ND |
| 2020-06-02 | CA1010017_070_070-202006021040 | ND |
| 2020-06-02 | CA1010017_071_071-202006021015 | ND |
| 2020-06-10 | CA1010017_071_071-202006101020 | ND |
| 2020-06-10 | CA1010017_070_070-202006101120 | ND |
| 2020-06-22 | CA1010017_044_044-202006221200 | 5.40 ppb |
| 2020-07-01 | CA1010017_070_070-202007011100 | ND |
| 2020-07-01 | CA1010017_071_071-202007011030 | ND |
| 2020-08-04 | CA1010017_071_071-202008040930 | ND |
| 2020-08-04 | CA1010017_070_070-202008041130 | ND |
| 2020-08-12 | CA1010017_044_044-202008121230 | 4.80 ppb |
| 2020-09-01 | CA1010017_070_070-202009010945 | ND |
| 2020-09-01 | CA1010017_071_071-202009011100 | ND |
| 2020-10-13 | CA1010017_070_070-202010131055 | ND |
| 2020-10-13 | CA1010017_071_071-202010130959 | ND |
| 2020-11-02 | CA1010017_071_071-202011021129 | ND |
| 2020-11-02 | CA1010017_070_070-202011021215 | ND |
| 2020-12-08 | CA1010017_044_044-202012081310 | 4.60 ppb |
| 2020-12-08 | CA1010017_071_071-202012081235 | ND |
| 2020-12-08 | CA1010017_070_070-202012081320 | ND |
| 2021-01-04 | CA1010017_070_070-202101041120 | ND |
| 2021-01-04 | CA1010017_071_071-202101041042 | ND |
| 2021-02-08 | CA1010017_071_071-202102081100 | ND |
| 2021-02-08 | CA1010017_070_070-202102081230 | ND |
| 2021-03-08 | CA1010017_009_009-202103081140 | ND |
| 2021-03-08 | CA1010017_001_001-202103081300 | ND |
| 2021-03-10 | CA1010017_070_070-202103101230 | ND |
| 2021-03-10 | CA1010017_071_071-202103101140 | ND |
| 2021-04-05 | CA1010017_006_006-202104050900 | ND |
| 2021-04-05 | CA1010017_004_004-202104051120 | ND |
| 2021-04-05 | CA1010017_008_008-202104051100 | ND |
| 2021-04-06 | CA1010017_042_042-202104061230 | ND |
| 2021-04-06 | CA1010017_070_070-202104060930 | ND |
| 2021-04-06 | CA1010017_071_071-202104060920 | ND |
| 2021-04-06 | CA1010017_011_011-202104061245 | ND |
| 2021-04-06 | CA1010017_012_012-202104061300 | ND |
| 2021-04-12 | CA1010017_014_014-202104121400 | ND |
| 2021-04-12 | CA1010017_015_015-202104121345 | ND |
| 2021-04-13 | CA1010017_034_034-202104131155 | ND |
| 2021-04-13 | CA1010017_062_062-202104131300 | ND |
| 2021-04-14 | CA1010017_005_005-202104141326 | ND |
| 2021-04-14 | CA1010017_033_033-202104141300 | ND |
| 2021-04-19 | CA1010017_036_036-202104191055 | ND |
| 2021-04-19 | CA1010017_035_035-202104191045 | ND |
| 2021-05-05 | CA1010017_070_070-202105051115 | ND |
| 2021-05-05 | CA1010017_071_071-202105050945 | ND |
| 2021-06-01 | CA1010017_070_070-202106011140 | ND |
| 2021-06-01 | CA1010017_071_071-202106011030 | ND |
| 2021-07-06 | CA1010017_071_071-202107061030 | ND |
| 2021-07-06 | CA1010017_070_070-202107060920 | ND |
| 2021-09-14 | CA1010017_070_070-202109141000 | ND |
| 2021-09-14 | CA1010017_071_071-202109141130 | ND |
| 2021-10-07 | CA1010017_071_071-202110071025 | ND |
| 2021-10-07 | CA1010017_070_070-202110071100 | ND |
| 2021-11-09 | CA1010017_071_071-202111091130 | ND |
| 2021-11-09 | CA1010017_070_070-202111091045 | ND |
| 2021-12-01 | CA1010017_070_070-202112011000 | ND |
| 2021-12-01 | CA1010017_071_071-202112011040 | ND |
| 2022-01-10 | CA1010017_071_071-202201101015 | ND |
| 2022-01-10 | CA1010017_070_070-202201100900 | ND |
| 2022-02-07 | CA1010017_071_071-202202071015 | ND |
| 2022-02-07 | CA1010017_070_070-202202071230 | ND |
| 2022-02-11 | CA1010017_041_041-202202111400 | ND |
| 2022-02-11 | CA1010017_066_066-202202111100 | ND |
| 2022-03-02 | CA1010017_059_059-202203021255 | ND |
| 2022-03-02 | CA1010017_065_065-202203021240 | ND |
| 2022-03-08 | CA1010017_070_070-202203081000 | ND |
| 2022-03-08 | CA1010017_071_071-202203081145 | ND |
| 2022-04-04 | CA1010017_071_071-202204041315 | ND |
| 2022-04-04 | CA1010017_070_070-202204041100 | ND |
| 2022-04-06 | CA1010017_037_037-202204061135 | ND |
| 2022-04-06 | CA1010017_040_040-202204061105 | ND |
| 2022-04-06 | CA1010017_043_043-202204061045 | ND |
| 2022-04-06 | CA1010017_044_044-202204061030 | 2.70 ppb |
| 2022-04-12 | CA1010017_057_057-202204121325 | ND |
| 2022-04-12 | CA1010017_056_056-202204121305 | ND |
| 2022-04-12 | CA1010017_058_058-202204121345 | ND |
| 2022-04-19 | CA1010017_038_038-202204191030 | ND |
| 2022-04-19 | CA1010017_046_046-202204191300 | ND |
| 2022-05-03 | CA1010017_070_070-202205031015 | ND |
| 2022-05-03 | CA1010017_071_071-202205030840 | ND |
| 2022-06-07 | CA1010017_070_070-202206071000 | ND |
| 2022-06-07 | CA1010017_071_071-202206071130 | ND |
| 2022-07-06 | CA1010017_071_071-202207061030 | ND |
| 2022-07-06 | CA1010017_070_070-202207060930 | ND |
| 2022-08-08 | CA1010017_070_070-202208081345 | ND |
| 2022-08-08 | CA1010017_071_071-202208081310 | ND |
| 2022-09-06 | CA1010017_070_070-202209061200 | ND |
| 2022-09-06 | CA1010017_071_071-202209060820 | ND |
| 2022-11-01 | CA1010017_070_070-202211011000 | ND |
| 2022-11-01 | CA1010017_071_071-202211011045 | ND |
| 2023-01-03 | CA1010017_070_070-202301031305 | ND |
| 2023-01-03 | CA1010017_071_071-202301031220 | ND |
| 2023-02-13 | CA1010017_070_070-202302130850 | ND |
| 2023-02-13 | CA1010017_071_071-202302130945 | ND |
| 2023-03-23 | CA1010017_071_071-202303231130 | ND |
| 2023-03-23 | CA1010017_070_070-202303231245 | ND |
| 2023-04-12 | CA1010017_070_070-202304121045 | ND |
| 2023-04-12 | CA1010017_071_071-202304121230 | ND |
| 2023-04-18 | CA1010017_070_070-202304181340 | ND |
| 2023-04-18 | CA1010017_071_071-202304181320 | ND |
| 2023-04-24 | CA1010017_002_002-202304241100 | ND |
| 2023-04-24 | CA1010017_049_049-202304241210 | ND |
| 2023-04-24 | CA1010017_047_047-202304241125 | ND |
| 2023-04-24 | CA1010017_048_048-202304241140 | ND |
| 2023-05-01 | CA1010017_070_070-202305011210 | ND |
| 2023-05-01 | CA1010017_071_071-202305010920 | ND |
| 2023-06-01 | CA1010017_070_070-202306011030 | ND |
| 2023-06-01 | CA1010017_071_071-202306011215 | ND |
| 2023-07-11 | CA1010017_070_070-202307111130 | ND |
| 2023-07-11 | CA1010017_071_071-202307111050 | ND |
| 2023-08-01 | CA1010017_070_070-202308011330 | ND |
| 2023-08-01 | CA1010017_071_071-202308011235 | ND |
| 2023-09-08 | CA1010017_071_071-202309080950 | ND |
| 2023-09-08 | CA1010017_070_070-202309080915 | ND |
| 2023-10-04 | CA1010017_070_070-202310040930 | ND |
| 2023-10-04 | CA1010017_071_071-202310041030 | ND |