Know Your Environment. Protect Your Health.

Arsenic

Town of St. Michaels

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.

 

58

Samples

5

Samples exceeding legal limit (MCL)

44

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20182.01 ppb98ND - 4.40 ppb
20194.56 ppb108ND - 13.8 ppb
20203.08 ppb64ND - 9.00 ppb
20215.76 ppb993.60 ppb - 9.10 ppb
20229.14 ppb98ND - 17.2 ppb
20232.53 ppb157ND - 9.70 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
2018-01-16LH_18_00634.40 ppb
2018-01-16LH_18_00621.40 ppb
2018-04-17LH_18_0003A2.20 ppb
2018-04-17LH_18_0002A1.10 ppb
2018-08-08E190004230013.00 ppb
2018-08-16KW_18_03791.30 ppb
2018-08-16KW_18_03802.30 ppb
2018-12-06KW_18_0533ND
2018-12-06KW_18_05342.40 ppb
2019-01-22JR_19_0156ND
2019-01-22JR_19_015711.2 ppb
2019-01-29JR_19_018113.8 ppb
2019-05-14JR_19_06051.000 ppb
2019-06-03KW_19_02989.20 ppb
2019-06-13KW_19_02991.000 ppb
2019-08-08KW_19_04172.60 ppb
2019-08-08KW_19_04161.000 ppb
2019-10-10KW_19_0533ND
2019-10-10KW_19_05345.80 ppb
2020-03-10JR-20-03614.70 ppb
2020-03-10JR-20-0362ND
2020-05-12JR-20-0569ND
2020-05-12JR-20-05703.00 ppb
2020-11-12JR_20_11181.80 ppb
2020-11-12JR_20_11199.00 ppb
2021-01-19JR_21_01813.60 ppb
2021-01-19JR_21_01823.90 ppb
2021-04-22JR_21_05897.50 ppb
2021-04-22JR_21_05907.60 ppb
2021-08-12JR-21-07906.00 ppb
2021-08-12JR_21_07914.00 ppb
2021-09-08E220008210024.00 ppb
2021-11-16JR_21_10716.10 ppb
2021-11-16JR_21_10729.10 ppb
2022-01-13JR-22-01317.50 ppb
2022-01-13JR-22-01328.50 ppb
2022-04-19JR-22-06514.90 ppb
2022-04-19JR-22-065216.0 ppb
2022-04-26KW_22_001917.2 ppb
2022-07-14JR-22-095116.8 ppb
2022-07-14JR-22-09526.70 ppb
2022-10-18JR_22_13014.70 ppb
2022-10-18JR_22_1302ND
2023-02-09JR-23-0314ND
2023-02-09JR-23-03139.70 ppb
2023-05-11JR-23-0681ND
2023-05-11JR-23-06824.10 ppb
2023-07-13JR-23-0861ND
2023-07-13JR-23-08624.10 ppb
2023-08-01JR-23-0991ND
2023-08-01JR-23-09924.70 ppb
2023-09-12DM-23-0001ND
2023-09-12DM-23-00024.80 ppb
2023-10-05DM-23-0029ND
2023-10-05DM-23-00306.50 ppb
2023-11-16DM-23-0094ND
2023-11-16DM-23-00954.10 ppb
2023-12-12DM-23-0110ND