Chromium (total)
City of Seagoville
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | 0.643 ppb | 21 | 19 | ND - 3.76 ppb |
2015 | 0.478 ppb | 8 | 8 | 0.271 ppb - 1.41 ppb |
2016 | 0.653 ppb | 3 | 3 | 0.480 ppb - 0.770 ppb |
2017 | 0.433 ppb | 3 | 1 | ND - 1.30 ppb |
2018 | 0.333 ppb | 3 | 1 | ND - 1.000 ppb |
2019 | ND | 3 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
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 |
---|---|---|
2015-02-11 | Q1505622001 | 0.271 ppb |
2015-02-11 | Q1505622003 | 1.41 ppb |
2015-05-26 | Q1519032003 | 0.451 ppb |
2015-05-26 | Q1519032001 | 0.382 ppb |
2015-08-12 | Q1531747003 | 0.353 ppb |
2015-08-12 | Q1531747001 | 0.287 ppb |
2015-11-23 | Q1546440003 | 0.292 ppb |
2015-11-23 | Q1546440001 | 0.377 ppb |