Arsenic
City of Coeur D Alene
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 | 5.48 ppb | 30 | 28 | ND - 25.0 ppb |
| 2019 | 6.36 ppb | 59 | 56 | ND - 28.8 ppb |
| 2020 | 6.24 ppb | 47 | 47 | 1.50 ppb - 29.0 ppb |
| 2021 | 4.49 ppb | 48 | 45 | ND - 22.5 ppb |
| 2022 | 4.02 ppb | 58 | 54 | ND - 13.3 ppb |
| 2023 | 5.86 ppb | 52 | 52 | 1.30 ppb - 26.3 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 |
|---|---|---|
| 2018-01-04 | I189752 | 4.60 ppb |
| 2018-01-04 | I189753 | 4.50 ppb |
| 2018-01-04 | I189754 | 1.50 ppb |
| 2018-01-04 | I189755 | 1.40 ppb |
| 2018-03-14 | I180314053002 | 1.58 ppb |
| 2018-03-14 | I180314053003 | 1.99 ppb |
| 2018-03-27 | I191766 | 2.40 ppb |
| 2018-03-27 | I191767 | 2.00 ppb |
| 2018-03-27 | I191768 | 3.10 ppb |
| 2018-03-27 | I191769 | 2.90 ppb |
| 2018-06-21 | I194498 | 25.0 ppb |
| 2018-06-21 | I194500 | 6.40 ppb |
| 2018-06-21 | I164501 | 9.00 ppb |
| 2018-06-21 | I194503 | 3.30 ppb |
| 2018-09-06 | I197136 | 10.00 ppb |
| 2018-09-06 | I197137 | 10.00 ppb |
| 2018-09-06 | I197138 | 23.0 ppb |
| 2018-09-06 | I197140 | 22.0 ppb |
| 2018-10-10 | I198500 | 4.60 ppb |
| 2018-10-10 | I198501 | 4.50 ppb |
| 2018-10-10 | I198502 | 2.70 ppb |
| 2018-10-10 | I198503 | 2.50 ppb |
| 2018-11-01 | I199105 | 3.60 ppb |
| 2018-11-01 | I199106 | 2.10 ppb |
| 2018-11-01 | I199107 | ND |
| 2018-11-01 | I199108 | ND |
| 2018-12-06 | I199994 | 3.40 ppb |
| 2018-12-06 | I199995 | 3.00 ppb |
| 2018-12-06 | I199996 | 1.90 ppb |
| 2018-12-06 | I199997 | 1.40 ppb |
| 2019-01-03 | I200514 | 2.00 ppb |
| 2019-01-03 | I200515 | 2.10 ppb |
| 2019-01-03 | I200516 | 3.00 ppb |
| 2019-01-03 | I200517 | 3.80 ppb |
| 2019-02-06 | I201321 | 4.60 ppb |
| 2019-02-06 | I201322 | 3.20 ppb |
| 2019-02-06 | I201323 | 3.00 ppb |
| 2019-02-06 | I201324 | 2.80 ppb |
| 2019-03-12 | I202015 | 2.40 ppb |
| 2019-03-12 | I202016 | 1.70 ppb |
| 2019-03-12 | I202017 | 10.00 ppb |
| 2019-03-12 | I202018 | 1.50 ppb |
| 2019-03-13 | I190313055002 | 2.33 ppb |
| 2019-04-02 | I202587 | 2.70 ppb |
| 2019-04-02 | I202588 | 2.40 ppb |
| 2019-04-02 | I202589 | 3.10 ppb |
| 2019-04-02 | I202590 | 3.80 ppb |
| 2019-05-01 | I203442 | 4.20 ppb |
| 2019-05-01 | I203443 | 3.70 ppb |
| 2019-05-01 | I203444 | 3.70 ppb |
| 2019-05-01 | I203445 | 2.20 ppb |
| 2019-05-23 | I204186 | 4.10 ppb |
| 2019-05-23 | I204189 | 5.10 ppb |
| 2019-05-23 | I204187 | 5.40 ppb |
| 2019-05-29 | I204288 | 1.60 ppb |
| 2019-05-29 | I204287 | 1.80 ppb |
| 2019-05-29 | I204291 | 10.00 ppb |
| 2019-06-03 | I204362 | 3.10 ppb |
| 2019-06-03 | I204360 | ND |
| 2019-06-03 | I204361 | 28.8 ppb |
| 2019-06-03 | I204363 | 3.10 ppb |
| 2019-06-07 | I204355 | 2.20 ppb |
| 2019-06-07 | I204356 | 22.4 ppb |
| 2019-06-07 | I204357 | 28.1 ppb |
| 2019-06-07 | I204358 | 2.60 ppb |
| 2019-07-02 | I205635 | 19.9 ppb |
| 2019-07-02 | I205636 | 18.6 ppb |
| 2019-07-02 | I205637 | 2.80 ppb |
| 2019-07-02 | I205638 | 2.20 ppb |
| 2019-08-08 | I207056 | 23.2 ppb |
| 2019-08-08 | I207058 | 21.5 ppb |
| 2019-08-08 | I207060 | 7.90 ppb |
| 2019-08-08 | I207061 | 7.80 ppb |
| 2019-09-05 | I208219 | 23.5 ppb |
| 2019-09-05 | I208221 | 24.6 ppb |
| 2019-09-05 | I208223 | ND |
| 2019-09-05 | I208224 | 2.50 ppb |
| 2019-10-07 | I209669 | 6.80 ppb |
| 2019-10-07 | I209670 | 1.90 ppb |
| 2019-10-07 | I209671 | 4.10 ppb |
| 2019-10-07 | I209672 | 4.30 ppb |
| 2019-11-05 | I210619 | ND |
| 2019-11-05 | I210620 | 1.70 ppb |
| 2019-11-05 | I210621 | 3.60 ppb |
| 2019-11-05 | I210622 | 2.90 ppb |
| 2019-12-05 | I211624 | 2.80 ppb |
| 2019-12-05 | I211625 | 2.70 ppb |
| 2019-12-05 | I211626 | 1.60 ppb |
| 2019-12-05 | I211627 | 1.70 ppb |
| 2020-01-06 | I212320 | 3.80 ppb |
| 2020-01-06 | I212321 | 3.30 ppb |
| 2020-01-06 | I212322 | 1.50 ppb |
| 2020-02-03 | I212998 | 4.10 ppb |
| 2020-02-03 | I212999 | 4.40 ppb |
| 2020-02-03 | I213000 | 2.00 ppb |
| 2020-02-03 | I213001 | 1.70 ppb |
| 2020-03-02 | I213699 | 1.70 ppb |
| 2020-03-02 | I213700 | 3.20 ppb |
| 2020-03-02 | I213701 | 5.00 ppb |
| 2020-03-02 | I213702 | 1.70 ppb |
| 2020-04-06 | I214578 | 5.20 ppb |
| 2020-04-06 | I214579 | 5.00 ppb |
| 2020-04-06 | I214580 | 3.00 ppb |
| 2020-04-06 | I214581 | 3.00 ppb |
| 2020-05-04 | I215380 | 2.60 ppb |
| 2020-05-04 | I215381 | 2.20 ppb |
| 2020-05-04 | I215382 | 4.60 ppb |
| 2020-05-04 | I215383 | 4.30 ppb |
| 2020-06-03 | I216471 | 2.40 ppb |
| 2020-06-03 | I216472 | 4.40 ppb |
| 2020-06-03 | I216473 | 4.40 ppb |
| 2020-06-03 | I216474 | 2.20 ppb |
| 2020-07-13 | I217840 | 28.2 ppb |
| 2020-07-13 | I217841 | 2.90 ppb |
| 2020-07-13 | I217843 | 2.20 ppb |
| 2020-07-13 | I217839 | 29.0 ppb |
| 2020-08-03 | I218709 | 24.3 ppb |
| 2020-08-03 | I218707 | 25.0 ppb |
| 2020-08-03 | I218711 | 6.20 ppb |
| 2020-08-03 | I218712 | 5.60 ppb |
| 2020-09-01 | I219905 | 6.90 ppb |
| 2020-09-01 | I219906 | 7.20 ppb |
| 2020-09-01 | I219907 | 24.6 ppb |
| 2020-09-01 | I219908 | 25.0 ppb |
| 2020-10-02 | I221359 | 3.40 ppb |
| 2020-10-02 | I221360 | 3.50 ppb |
| 2020-10-02 | I221361 | 1.60 ppb |
| 2020-10-02 | I221362 | 1.90 ppb |
| 2020-11-02 | I222387 | 3.10 ppb |
| 2020-11-02 | I222386 | 2.10 ppb |
| 2020-11-02 | I222389 | 2.90 ppb |
| 2020-11-02 | I222388 | 2.00 ppb |
| 2020-12-01 | I223238 | 2.20 ppb |
| 2020-12-01 | I223239 | 1.80 ppb |
| 2020-12-01 | I223236 | 3.00 ppb |
| 2020-12-01 | I223237 | 3.20 ppb |
| 2021-01-05 | I224219 | 3.00 ppb |
| 2021-01-05 | I224220 | 2.90 ppb |
| 2021-01-05 | I224222 | 2.50 ppb |
| 2021-01-05 | I224221 | 1.80 ppb |
| 2021-02-01 | I224956 | 1.70 ppb |
| 2021-02-01 | I224955 | 2.50 ppb |
| 2021-02-01 | I224954 | 2.10 ppb |
| 2021-02-01 | I224957 | 1.90 ppb |
| 2021-03-01 | I225656 | 3.10 ppb |
| 2021-03-02 | I225784 | ND |
| 2021-03-08 | I225896 | 2.30 ppb |
| 2021-03-08 | I225897 | 3.40 ppb |
| 2021-04-13 | I226982 | 3.60 ppb |
| 2021-04-13 | I226981 | 4.50 ppb |
| 2021-04-13 | I226979 | 1.20 ppb |
| 2021-04-13 | I226980 | 2.50 ppb |
| 2021-05-11 | I228046 | 2.80 ppb |
| 2021-05-11 | I228047 | 3.00 ppb |
| 2021-05-11 | I228048 | 1.50 ppb |
| 2021-05-11 | I228049 | ND |
| 2021-06-17 | I229237 | 4.10 ppb |
| 2021-06-17 | I229238 | 4.00 ppb |
| 2021-06-17 | I229241 | 2.00 ppb |
| 2021-06-17 | I229240 | 6.80 ppb |
| 2021-07-19 | I230298 | 6.50 ppb |
| 2021-07-19 | I230299 | 6.40 ppb |
| 2021-07-20 | I230330 | 20.6 ppb |
| 2021-07-20 | I230331 | 20.2 ppb |
| 2021-08-26 | I231983 | 22.1 ppb |
| 2021-08-26 | I231985 | 6.90 ppb |
| 2021-08-26 | I231986 | 4.00 ppb |
| 2021-08-26 | I231982 | 22.5 ppb |
| 2021-09-29 | I233508 | 2.50 ppb |
| 2021-09-29 | I233507 | 1.80 ppb |
| 2021-09-29 | I233510 | 4.00 ppb |
| 2021-09-29 | I233509 | 5.00 ppb |
| 2021-10-12 | I234107 | ND |
| 2021-10-12 | I234104 | 4.40 ppb |
| 2021-10-12 | I234106 | 2.00 ppb |
| 2021-10-12 | I234105 | 4.60 ppb |
| 2021-11-04 | I235067 | 2.30 ppb |
| 2021-11-04 | I235064 | 2.10 ppb |
| 2021-11-04 | I235066 | 3.20 ppb |
| 2021-11-04 | I235065 | 1.50 ppb |
| 2021-12-02 | I235920 | 2.40 ppb |
| 2021-12-02 | I235919 | 3.20 ppb |
| 2021-12-02 | I235918 | 2.70 ppb |
| 2021-12-02 | I235921 | 1.60 ppb |
| 2022-01-25 | I237375 | 2.80 ppb |
| 2022-01-25 | I237376 | 2.10 ppb |
| 2022-01-25 | I237377 | 2.00 ppb |
| 2022-01-25 | I237378 | 2.40 ppb |
| 2022-02-08 | I237801 | 2.60 ppb |
| 2022-02-08 | I237802 | 3.00 ppb |
| 2022-02-08 | I237803 | 4.10 ppb |
| 2022-02-08 | I237804 | 3.40 ppb |
| 2022-03-23 | I239063 | 5.00 ppb |
| 2022-03-23 | I239064 | 4.20 ppb |
| 2022-03-23 | I239065 | 1.90 ppb |
| 2022-03-23 | I239066 | 1.70 ppb |
| 2022-03-24 | IMCC080402 | 2.35 ppb |
| 2022-03-24 | IMCC080403 | 2.76 ppb |
| 2022-04-04 | I239277 | 3.70 ppb |
| 2022-04-04 | I239278 | 5.40 ppb |
| 2022-04-04 | I239279 | 4.70 ppb |
| 2022-04-04 | I239280 | 2.00 ppb |
| 2022-04-26 | I239993 | ND |
| 2022-04-27 | I240138 | 3.00 ppb |
| 2022-04-27 | I240183 | 1.60 ppb |
| 2022-04-28 | I240187 | ND |
| 2022-05-02 | I240593 | 4.70 ppb |
| 2022-05-02 | I240615 | 2.50 ppb |
| 2022-05-02 | I240620 | 4.20 ppb |
| 2022-05-02 | I240583 | 6.40 ppb |
| 2022-05-09 | I240821 | 2.30 ppb |
| 2022-05-09 | I240822 | 2.20 ppb |
| 2022-05-09 | I240823 | 4.30 ppb |
| 2022-05-09 | I240824 | 4.40 ppb |
| 2022-06-21 | II242413 | 3.90 ppb |
| 2022-06-21 | I242414 | 4.50 ppb |
| 2022-06-21 | I242415 | 2.70 ppb |
| 2022-06-21 | I242416 | 2.20 ppb |
| 2022-07-11 | I243277 | 6.30 ppb |
| 2022-07-11 | I243279 | 8.80 ppb |
| 2022-07-11 | I243280 | 6.30 ppb |
| 2022-08-10 | I244787 | 12.0 ppb |
| 2022-08-10 | I244788 | 9.30 ppb |
| 2022-08-10 | I244789 | 6.60 ppb |
| 2022-08-10 | I244791 | 7.00 ppb |
| 2022-08-10 | I244760 | 4.20 ppb |
| 2022-09-14 | I246512 | 13.3 ppb |
| 2022-09-14 | I246514 | 10.00 ppb |
| 2022-09-14 | I246515 | 6.20 ppb |
| 2022-09-14 | I246516 | 6.20 ppb |
| 2022-10-20 | I248546 | 2.70 ppb |
| 2022-10-20 | I248548 | 2.60 ppb |
| 2022-10-20 | I248549 | 4.20 ppb |
| 2022-10-20 | I248550 | 4.30 ppb |
| 2022-11-15 | I249467 | 1.40 ppb |
| 2022-11-15 | I249468 | 2.70 ppb |
| 2022-11-15 | I249469 | ND |
| 2022-11-15 | I249470 | 2.90 ppb |
| 2022-12-20 | I250571 | ND |
| 2022-12-20 | I250572 | 2.30 ppb |
| 2022-12-20 | I250573 | 4.50 ppb |
| 2022-12-20 | I250574 | 4.50 ppb |
| 2023-01-20 | I251417 | 2.80 ppb |
| 2023-01-20 | I251418 | 2.60 ppb |
| 2023-01-20 | I251419 | 3.40 ppb |
| 2023-01-20 | I251420 | 3.50 ppb |
| 2023-02-13 | I251987 | 2.60 ppb |
| 2023-02-13 | I251990 | 4.00 ppb |
| 2023-02-13 | I251989 | 4.40 ppb |
| 2023-02-13 | I251988 | 3.20 ppb |
| 2023-03-22 | I253034 | 2.20 ppb |
| 2023-03-22 | I253035 | 4.90 ppb |
| 2023-03-22 | I253036 | 4.60 ppb |
| 2023-03-22 | I253037 | 2.40 ppb |
| 2023-03-23 | IMDC083402 | 3.10 ppb |
| 2023-04-24 | I254083 | 2.60 ppb |
| 2023-04-24 | I254084 | 10.00 ppb |
| 2023-04-24 | I254085 | 2.80 ppb |
| 2023-04-24 | I254086 | 3.00 ppb |
| 2023-05-16 | I254944 | 2.00 ppb |
| 2023-05-16 | I254945 | 3.30 ppb |
| 2023-05-16 | I254946 | 4.80 ppb |
| 2023-05-18 | I255057 | 3.70 ppb |
| 2023-06-07 | I255720 | 5.30 ppb |
| 2023-06-07 | I255721 | 9.60 ppb |
| 2023-06-07 | I255722 | 26.3 ppb |
| 2023-06-07 | I255723 | 9.30 ppb |
| 2023-06-07 | I255724 | 10.9 ppb |
| 2023-06-27 | I256491 | 23.8 ppb |
| 2023-06-27 | I256492 | 25.2 ppb |
| 2023-06-27 | I256494 | 3.50 ppb |
| 2023-06-27 | I256495 | 6.50 ppb |
| 2023-07-19 | I257500 | 1.30 ppb |
| 2023-07-19 | 257502 | 7.90 ppb |
| 2023-08-02 | I258046 | 10.3 ppb |
| 2023-08-02 | I258048 | 8.10 ppb |
| 2023-08-02 | I258049 | 18.0 ppb |
| 2023-08-02 | I258051 | 7.50 ppb |
| 2023-09-19 | I259969 | 2.90 ppb |
| 2023-09-19 | I259970 | 2.70 ppb |
| 2023-09-19 | I259971 | 4.10 ppb |
| 2023-09-19 | I259973 | 4.30 ppb |
| 2023-10-04 | I260994 | 2.80 ppb |
| 2023-10-04 | I260996 | 2.90 ppb |
| 2023-10-04 | I260998 | 6.10 ppb |
| 2023-10-04 | I260999 | 5.60 ppb |
| 2023-11-17 | I262469 | 2.90 ppb |
| 2023-11-17 | I262470 | 2.80 ppb |
| 2023-11-17 | I262471 | 3.30 ppb |
| 2023-11-17 | 262472 | 3.00 ppb |
| 2023-12-14 | I263173 | 3.00 ppb |
| 2023-12-14 | I263174 | 2.70 ppb |
| 2023-12-14 | I263175 | 3.20 ppb |
| 2023-12-14 | I263176 | 2.80 ppb |