Arsenic
Whispering Pines Inn
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 | 0.877 ppb | 13 | 1 | ND - 11.4 ppb |
| 2019 | 0.658 ppb | 12 | 3 | ND - 4.40 ppb |
| 2020 | 3.55 ppb | 6 | 5 | ND - 10.00 ppb |
| 2021 | 8.12 ppb | 64 | 44 | ND - 47.8 ppb |
| 2022 | 6.87 ppb | 65 | 46 | ND - 45.5 ppb |
| 2023 | 4.44 ppb | 64 | 21 | ND - 48.9 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 |
|---|---|---|
| 2018-01-03 | CA3500810_003_003-201801030940 | ND |
| 2018-02-21 | CA3500810_003_003-201802211110 | ND |
| 2018-03-21 | CA3500810_003_003-201803211045 | ND |
| 2018-04-25 | CA3500810_003_003-201804251417 | ND |
| 2018-05-14 | CA3500810_003_003-201805141200 | 11.4 ppb |
| 2018-06-13 | CA3500810_003_003-201806131035 | ND |
| 2018-07-25 | CA3500810_003_003-201807251140 | ND |
| 2018-08-22 | CA3500810_003_003-201808221110 | ND |
| 2018-09-26 | CA3500810_001_001-201809261245 | ND |
| 2018-09-26 | CA3500810_003_003-201809261425 | ND |
| 2018-10-17 | CA3500810_003_003-201810171325 | ND |
| 2018-11-19 | CA3500810_003_003-201811191035 | ND |
| 2018-12-20 | CA3500810_003_003-201812201210 | ND |
| 2019-01-16 | CA3500810_003_003-201901161117 | ND |
| 2019-02-20 | CA3500810_003_003-201902201117 | ND |
| 2019-03-20 | CA3500810_003_003-201903201534 | 0.600 ppb |
| 2019-04-17 | CA3500810_003_003-201904171106 | ND |
| 2019-05-22 | CA3500810_003_003-201905221055 | ND |
| 2019-06-20 | CA3500810_003_003-201906201510 | ND |
| 2019-07-19 | CA3500810_003_003-201907190945 | ND |
| 2019-08-14 | CA3500810_003_003-201908141305 | 4.40 ppb |
| 2019-09-23 | CA3500810_003_003-201909231605 | ND |
| 2019-10-23 | CA3500810_003_003-201910231420 | ND |
| 2019-11-20 | CA3500810_003_003-201911201055 | 2.90 ppb |
| 2019-12-19 | CA3500810_003_003-201912191040 | ND |
| 2020-01-22 | CA3500810_003_003-202001221117 | ND |
| 2020-02-05 | CA3500810_003_003-202002051138 | 3.20 ppb |
| 2020-03-11 | CA3500810_003_003-202003111125 | 10.00 ppb |
| 2020-04-06 | CA3500810_003_003-202004061125 | 6.80 ppb |
| 2020-05-06 | CA3500810_003_003-202005061135 | 0.700 ppb |
| 2020-06-01 | CA3500810_003_003-202006011230 | 0.600 ppb |
| 2021-01-21 | CA3500810_004_004-202101211227 | 2.80 ppb |
| 2021-01-25 | CA3500810_004_004-202101250930 | 4.00 ppb |
| 2021-02-10 | CA3500810_003_003-202102100911 | 40.5 ppb |
| 2021-03-05 | CA3500810_003_003-202103051500 | 3.10 ppb |
| 2021-03-08 | CA3500810_003_003-202103081255 | 1.60 ppb |
| 2021-03-18 | CA3500810_003_003-202103181055 | 4.20 ppb |
| 2021-03-24 | CA3500810_004_004-202103241105 | 4.70 ppb |
| 2021-03-24 | CA3500810_003_003-202103241105 | 2.50 ppb |
| 2021-03-31 | CA3500810_003_003-202103311116 | 3.40 ppb |
| 2021-03-31 | CA3500810_004_004-202103311116 | 4.00 ppb |
| 2021-04-07 | CA3500810_004_004-202104071053 | 8.70 ppb |
| 2021-04-07 | CA3500810_003_003-202104071053 | 3.30 ppb |
| 2021-04-13 | CA3500810_003_003-202104131100 | 2.50 ppb |
| 2021-04-22 | CA3500810_003_003-202104221145 | ND |
| 2021-04-22 | CA3500810_004_004-202104221147 | 13.6 ppb |
| 2021-04-27 | CA3500810_003_003-202104270955 | ND |
| 2021-04-27 | CA3500810_004_004-202104270954 | 14.7 ppb |
| 2021-05-05 | CA3500810_004_004-202105051114 | 27.0 ppb |
| 2021-05-05 | CA3500810_003_003-202105051113 | ND |
| 2021-05-12 | CA3500810_003_003-202105121050 | 1.80 ppb |
| 2021-05-17 | CA3500810_003_003-202105171036 | 3.40 ppb |
| 2021-05-25 | CA3500810_004_004-202105251145 | 4.20 ppb |
| 2021-05-25 | CA3500810_003_003-202105251145 | 1.10 ppb |
| 2021-06-03 | CA3500810_004_004-202106030933 | ND |
| 2021-06-03 | CA3500810_003_003-202106030935 | ND |
| 2021-06-07 | CA3500810_003_003-202106070946 | ND |
| 2021-06-16 | CA3500810_003_003-202106161109 | ND |
| 2021-06-23 | CA3500810_003_003-202106231050 | ND |
| 2021-06-29 | CA3500810_003_003-202106291045 | 12.1 ppb |
| 2021-07-08 | CA3500810_003_003-202107081125 | ND |
| 2021-07-14 | CA3500810_003_003-202107141100 | ND |
| 2021-07-19 | CA3500810_003_003-202107191059 | ND |
| 2021-07-26 | CA3500810_004_004-202107261033 | ND |
| 2021-07-26 | CA3500810_003_003-202107261035 | ND |
| 2021-08-04 | CA3500810_003_003-202108041152 | ND |
| 2021-08-04 | CA3500810_004_004-202108041150 | 5.30 ppb |
| 2021-08-09 | CA3500810_004_004-202108091126 | 47.8 ppb |
| 2021-08-09 | CA3500810_003_003-202108091124 | 4.20 ppb |
| 2021-08-16 | CA3500810_003_003-202108161455 | 7.70 ppb |
| 2021-08-25 | CA3500810_003_003-202108251217 | 19.7 ppb |
| 2021-09-01 | CA3500810_003_003-202109011123 | 25.3 ppb |
| 2021-09-10 | CA3500810_004_004-202109101127 | 21.4 ppb |
| 2021-09-10 | CA3500810_003_003-202109101128 | 1.60 ppb |
| 2021-09-15 | CA3500810_003_003-202109151053 | 4.60 ppb |
| 2021-09-15 | CA3500810_004_004-202109151051 | 31.4 ppb |
| 2021-09-22 | CA3500810_003_003-202109221122 | 7.10 ppb |
| 2021-09-29 | CA3500810_003_003-202109291125 | 9.00 ppb |
| 2021-10-04 | CA3500810_003_003-202110041238 | ND |
| 2021-10-04 | CA3500810_004_004-202110041236 | 12.0 ppb |
| 2021-10-13 | CA3500810_004_004-202110131014 | 13.9 ppb |
| 2021-10-13 | CA3500810_003_003-202110131015 | 1.10 ppb |
| 2021-10-19 | CA3500810_003_003-202110191115 | ND |
| 2021-10-19 | CA3500810_004_004-202110191116 | 43.2 ppb |
| 2021-10-25 | CA3500810_003_003-202110251144 | ND |
| 2021-11-03 | CA3500810_003_003-202111031030 | ND |
| 2021-11-08 | CA3500810_003_003-202111081038 | ND |
| 2021-11-17 | CA3500810_003_003-202111171020 | 31.7 ppb |
| 2021-11-30 | CA3500810_003_003-202111301040 | 8.30 ppb |
| 2021-12-08 | CA3500810_003_003-202112081010 | 7.60 ppb |
| 2021-12-13 | CA3500810_004_004-202112131033 | 13.6 ppb |
| 2021-12-13 | CA3500810_003_003-202112131034 | ND |
| 2021-12-22 | CA3500810_003_003-202112221010 | 11.7 ppb |
| 2021-12-29 | CA3500810_004_004-202112291134 | 26.1 ppb |
| 2021-12-29 | CA3500810_003_003-202112291135 | 2.30 ppb |
| 2022-01-05 | CA3500810_004_004-202201051112 | 31.6 ppb |
| 2022-01-05 | CA3500810_003_003-202201051115 | ND |
| 2022-01-12 | CA3500810_003_003-202201121000 | ND |
| 2022-01-19 | CA3500810_004_004-202201191205 | ND |
| 2022-01-19 | CA3500810_003_003-202201191207 | ND |
| 2022-01-24 | CA3500810_003_003-202201241012 | ND |
| 2022-01-24 | CA3500810_004_004-202201241010 | 7.70 ppb |
| 2022-02-02 | CA3500810_003_003-202202021123 | ND |
| 2022-02-09 | CA3500810_003_003-202202091013 | 1.20 ppb |
| 2022-02-14 | CA3500810_003_003-202202141145 | 3.30 ppb |
| 2022-02-23 | CA3500810_003_003-202202231056 | 16.6 ppb |
| 2022-03-04 | CA3500810_003_003-202203041256 | 28.1 ppb |
| 2022-03-04 | CA3500810_004_004-202203041255 | 2.50 ppb |
| 2022-03-09 | CA3500810_003_003-202203091036 | 16.3 ppb |
| 2022-03-09 | CA3500810_004_004-202203091034 | 2.30 ppb |
| 2022-03-16 | CA3500810_003_003-202203161040 | 3.40 ppb |
| 2022-03-16 | CA3500810_004_004-202203161041 | 21.6 ppb |
| 2022-03-21 | CA3500810_003_003-202203211047 | 4.80 ppb |
| 2022-03-21 | CA3500810_004_004-202203211046 | 41.1 ppb |
| 2022-03-28 | CA3500810_003_003-202203281031 | 8.80 ppb |
| 2022-04-06 | CA3500810_003_003-202204061717 | 12.9 ppb |
| 2022-04-13 | CA3500810_003_003-202204131340 | ND |
| 2022-04-13 | CA3500810_004_004-202204131340 | 24.4 ppb |
| 2022-04-19 | CA3500810_003_003-202204191130 | 1.40 ppb |
| 2022-04-19 | CA3500810_004_004-202204191130 | 45.5 ppb |
| 2022-04-27 | CA3500810_003_003-202204271140 | 2.50 ppb |
| 2022-05-04 | CA3500810_003_003-202205041055 | 2.30 ppb |
| 2022-05-09 | CA3500810_003_003-202205091130 | 6.70 ppb |
| 2022-05-18 | CA3500810_003_003-202205181054 | 9.50 ppb |
| 2022-05-25 | CA3500810_003_003-202205251145 | 1.10 ppb |
| 2022-05-25 | CA3500810_004_004-202205251144 | 9.30 ppb |
| 2022-06-01 | CA3500810_004_004-202206011327 | 18.6 ppb |
| 2022-06-01 | CA3500810_003_003-202206011329 | 1.90 ppb |
| 2022-06-08 | CA3500810_003_003-202206081050 | 5.10 ppb |
| 2022-06-13 | CA3500810_003_003-202206131054 | 8.60 ppb |
| 2022-06-22 | CA3500810_004_004-202206221212 | 10.7 ppb |
| 2022-06-22 | CA3500810_003_003-202206221212 | ND |
| 2022-06-29 | CA3500810_004_004-202206291116 | 19.0 ppb |
| 2022-06-29 | CA3500810_003_003-202206291117 | ND |
| 2022-07-11 | CA3500810_003_003-202207111125 | ND |
| 2022-07-13 | CA3500810_003_003-202207131133 | ND |
| 2022-07-20 | CA3500810_003_003-202207201150 | ND |
| 2022-07-27 | CA3500810_003_003-202207271315 | 1.30 ppb |
| 2022-08-03 | CA3500810_003_003-202208031100 | 3.80 ppb |
| 2022-08-10 | CA3500810_004_004-202208101046 | 21.8 ppb |
| 2022-08-10 | CA3500810_003_003-202208101047 | ND |
| 2022-08-17 | CA3500810_003_003-202208171136 | ND |
| 2022-08-24 | CA3500810_003_003-202208241051 | ND |
| 2022-09-01 | CA3500810_003_003-202209011114 | ND |
| 2022-09-07 | CA3500810_003_003-202209071248 | 5.30 ppb |
| 2022-09-14 | CA3500810_003_003-202209141337 | 3.20 ppb |
| 2022-09-19 | CA3500810_003_003-202209191246 | 1.20 ppb |
| 2022-09-28 | CA3500810_003_003-202209281105 | 9.80 ppb |
| 2022-10-05 | CA3500810_003_003-202210051324 | 1.70 ppb |
| 2022-10-10 | CA3500810_003_003-202210101118 | 1.70 ppb |
| 2022-10-19 | CA3500810_003_003-202210191131 | 3.90 ppb |
| 2022-11-02 | CA3500810_003_003-202211021243 | 1.20 ppb |
| 2022-11-09 | CA3500810_003_003-202211091023 | 1.10 ppb |
| 2022-11-16 | CA3500810_003_003-202211161250 | ND |
| 2022-11-21 | CA3500810_003_003-202211211128 | 12.1 ppb |
| 2022-12-06 | CA3500810_003_003-202212061301 | 3.40 ppb |
| 2022-12-07 | CA3500810_003_003-202212071147 | 2.40 ppb |
| 2022-12-14 | CA3500810_003_003-202212141018 | 3.90 ppb |
| 2022-12-21 | CA3500810_003_003-202212211059 | ND |
| 2022-12-27 | CA3500810_003_003-202212271143 | ND |
| 2023-01-06 | CA3500810_003_003-202301061147 | ND |
| 2023-01-06 | CA3500810_004_004-202301061146 | 48.9 ppb |
| 2023-01-11 | CA3500810_003_003-202301111037 | ND |
| 2023-01-18 | CA3500810_003_003-202301181044 | ND |
| 2023-01-25 | CA3500810_003_003-202301251117 | ND |
| 2023-02-01 | CA3500810_003_003-202302011213 | 2.80 ppb |
| 2023-02-09 | CA3500810_004_004-202302091132 | 25.3 ppb |
| 2023-02-09 | CA3500810_003_003-202302091133 | ND |
| 2023-02-15 | CA3500810_003_003-202302151132 | ND |
| 2023-02-21 | CA3500810_003_003-202302211459 | ND |
| 2023-03-02 | CA3500810_003_003-202303021014 | ND |
| 2023-03-08 | CA3500810_003_003-202303081138 | ND |
| 2023-03-15 | CA3500810_003_003-202303151128 | ND |
| 2023-03-15 | CA3500810_004_004-202303151129 | 2.60 ppb |
| 2023-03-22 | CA3500810_004_004-202303221026 | 18.0 ppb |
| 2023-03-22 | CA3500810_003_003-202303221025 | ND |
| 2023-03-29 | CA3500810_003_003-202303291120 | ND |
| 2023-04-06 | CA3500810_003_003-202304061205 | ND |
| 2023-04-13 | CA3500810_003_003-202304130905 | ND |
| 2023-04-26 | CA3500810_003_003-202304261036 | ND |
| 2023-04-26 | CA3500810_004_004-202304261040 | 4.70 ppb |
| 2023-05-03 | CA3500810_003_003-202305031108 | ND |
| 2023-05-03 | CA3500810_004_004-202305031110 | 30.0 ppb |
| 2023-05-10 | CA3500810_003_003-202305101256 | ND |
| 2023-05-17 | CA3500810_003_003-202305171324 | ND |
| 2023-05-24 | CA3500810_004_004-202305241141 | ND |
| 2023-05-24 | CA3500810_003_003-202305241137 | ND |
| 2023-06-01 | CA3500810_004_004-202306011212 | 5.20 ppb |
| 2023-06-01 | CA3500810_003_003-202306011210 | ND |
| 2023-06-07 | CA3500810_003_003-202306071020 | ND |
| 2023-06-14 | CA3500810_003_003-202306141226 | 1.000 ppb |
| 2023-06-23 | CA3500810_003_003-202306231234 | ND |
| 2023-06-26 | CA3500810_003_003-202306261140 | ND |
| 2023-07-05 | CA3500810_003_003-202307051144 | ND |
| 2023-07-11 | CA3500810_003_003-202307111114 | ND |
| 2023-07-19 | CA3500810_003_003-202307191043 | 6.40 ppb |
| 2023-07-26 | CA3500810_004_004-202307261548 | 46.6 ppb |
| 2023-07-26 | CA3500810_003_003-202307261546 | ND |
| 2023-08-02 | CA3500810_003_003-202308021156 | ND |
| 2023-08-10 | CA3500810_003_003-202308101442 | ND |
| 2023-08-16 | CA3500810_003_003-202308161129 | 2.00 ppb |
| 2023-08-25 | CA3500810_004_004-202308251115 | 17.1 ppb |
| 2023-08-25 | CA3500810_003_003-202308251113 | ND |
| 2023-08-30 | CA3500810_003_003-202308301015 | ND |
| 2023-09-06 | CA3500810_003_003-202309061208 | ND |
| 2023-09-13 | CA3500810_003_003-202309131305 | ND |
| 2023-09-20 | CA3500810_004_004-202309201437 | ND |
| 2023-09-20 | CA3500810_003_003-202309201435 | ND |
| 2023-09-27 | CA3500810_003_003-202309271350 | ND |
| 2023-10-04 | CA3500810_003_003-202310041358 | ND |
| 2023-10-11 | CA3500810_003_003-202310111221 | ND |
| 2023-10-19 | CA3500810_003_003-202310191242 | ND |
| 2023-10-19 | CA3500810_004_004-202310191240 | ND |
| 2023-11-01 | CA3500810_003_003-202311011155 | ND |
| 2023-11-08 | CA3500810_003_003-202311081130 | 2.60 ppb |
| 2023-11-13 | CA3500810_003_003-202311131120 | 4.90 ppb |
| 2023-11-20 | CA3500810_003_003-202311201140 | 6.00 ppb |
| 2023-11-27 | CA3500810_003_003-202311271307 | 1.80 ppb |
| 2023-12-04 | CA3500810_003_003-202312041145 | 5.00 ppb |
| 2023-12-14 | CA3500810_003_003-202312141055 | 9.00 ppb |
| 2023-12-20 | CA3500810_003_003-202312201125 | ND |
| 2023-12-20 | CA3500810_004_004-202312201127 | 8.10 ppb |
| 2023-12-27 | CA3500810_004_004-202312271117 | 36.0 ppb |
| 2023-12-27 | CA3500810_003_003-202312271115 | ND |