Chromium (total)
Town of Hampstead
Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.
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 | 3.45 ppb | 11 | 3 | ND - 31.0 ppb |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | 1.000 ppb | 8 | 5 | ND - 4.00 ppb |
| 2021 | 0.500 ppb | 8 | 4 | ND - 1.000 ppb |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 2 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EPA Maximum Contaminant
Level (MCL): 100 ppb
The legal limit for total chromium, established in 1991, was based on a 1958 toxicity study in laboratory animals, and applies to both the less-toxic trivalent chromium and the more-toxic hexavalent chromium forms of this compound. This limit does not protect against the risk of cancer from ingestion of hexavalent chromium.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-06-04 | E054175_12 | ND |
| 2018-09-05 | E055512_04 | ND |
| 2018-09-05 | E055512_06 | 4.00 ppb |
| 2018-09-05 | E055512_08 | 31.0 ppb |
| 2018-09-05 | E055512_10 | ND |
| 2018-09-05 | E055512_15 | ND |
| 2018-09-05 | E055512_18 | ND |
| 2018-09-05 | E055512_20 | ND |
| 2018-10-02 | E19001148003 | ND |
| 2018-10-02 | E1900148002 | ND |
| 2018-12-03 | E056641_02 | 3.00 ppb |
| 2020-03-03 | E062383-06 | 1.000 ppb |
| 2020-03-03 | E062383-18 | 1.000 ppb |
| 2020-03-03 | E20002994004 | ND |
| 2020-06-03 | E20003718002 | ND |
| 2020-07-29 | E21000292002 | ND |
| 2020-09-01 | E064325-04 | 1.000 ppb |
| 2020-09-01 | E064325-11 | 1.000 ppb |
| 2020-12-14 | E065517_02 | 4.00 ppb |
| 2021-01-21 | E21001852002 | ND |
| 2021-06-02 | E067105_14 | 1.000 ppb |
| 2021-09-01 | E068099_05 | 1.000 ppb |
| 2021-09-01 | E068099_06 | 1.000 ppb |
| 2021-09-01 | E068099_12 | ND |
| 2021-09-01 | E068099_15 | ND |
| 2021-09-01 | E068099_16 | ND |
| 2021-12-02 | E069059_02 | 1.000 ppb |
| 2022-03-01 | E2200123702 | ND |
| 2022-08-03 | E230002502 | ND |
| 2023-03-01 | 030123-316BB1-3 | ND |
| 2023-12-04 | 120423-316AA1-BB3 | ND |