Chromium (total)
CTWC - Unionville System
NOTE: CTWC - Unionville System purchases water from Metropolitan District Commission which is required to test for chromium (total). Sample information shown below was taken by Metropolitan District Commission.
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 | ND | 1 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 1 | 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
NOTE: CTWC - Unionville System purchases water from Metropolitan District Commission which is required to test for chromium (total). Sample information shown below was taken by Metropolitan District Commission.
| Date | Lab ID | Result |
|---|---|---|
| 2018-07-18 | AE01630GE | ND |
| 2018-07-18 | AE01631GE | ND |
| 2018-07-18 | AE01636GE | ND |
| 2018-07-18 | AE01637GE | ND |
| 2018-07-18 | AE01640GE | ND |
| 2018-07-18 | AE01632GE | ND |
| 2018-07-18 | AE01641GE | ND |
| 2019-12-03 | CE70736 | ND |
| 2019-12-03 | CE70735 | ND |
| 2019-12-03 | CE70734 | ND |
| 2019-12-03 | CE70733 | ND |
| 2019-12-03 | CE70741 | ND |
| 2019-12-03 | CE70739 | ND |
| 2019-12-03 | CE70740 | ND |
| 2020-12-08 | IOC1 200600637 | ND |
| 2020-12-08 | IOC1 200600611 | ND |
| 2020-12-08 | IOCR 200600614 | ND |
| 2020-12-08 | IOCR 200600615 | ND |
| 2020-12-08 | IOCR 200600616 | ND |
| 2020-12-08 | IOCR 200600617 | ND |
| 2020-12-09 | IOC1 200600603 | ND |
| 2021-11-23 | I300107476 300107479 | ND |
| 2021-11-23 | E300107451 300107460 | ND |
| 2021-11-29 | E300109635 300109640 | ND |
| 2021-11-29 | I300109610 300109613 | ND |
| 2021-11-30 | I300109649 300109653 | ND |
| 2021-11-30 | I300109650 300109659 | ND |
| 2022-12-08 | I300283837 300283842 | ND |
| 2022-12-08 | 300283822 300283827B | ND |
| 2022-12-15 | E300287100 300287104 | ND |
| 2022-12-15 | I300287081 300287086 | ND |
| 2022-12-15 | I300287109 300287112 | ND |
| 2022-12-15 | E300287072 300287076 | ND |
| 2022-12-15 | E300287053 300287057 | ND |
| 2023-12-05 | E300456248 300456251 | ND |
| 2023-12-05 | I300456268 300456271 | ND |
| 2023-12-05 | I300456261 300456264 | ND |
| 2023-12-05 | I300456281 300456284 | ND |
| 2023-12-06 | E300456222 300456225 | ND |
| 2023-12-06 | E300456228 300456231 | ND |
| 2023-12-06 | I300456234 300456237 | ND |