Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Chromium (total)

City of Post Falls

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.

 

27

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
20130.147 ppb138ND - 0.256 ppb
20140.204 ppb1210ND - 0.261 ppb
2015N/A00N/A
2016ND20ND
2017N/A00N/A

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
2013-06-20I141194ND
2013-11-14131118001-0090.250 ppb
2013-11-14131118001-0060.249 ppb
2013-11-14131118001-008ND
2013-11-14131118001-0070.236 ppb
2013-11-14131118001-002ND
2013-11-14131118001-0010.245 ppb
2013-11-14131118001-0030.239 ppb
2013-11-14131118001-0120.231 ppb
2013-11-14131118001-0100.206 ppb
2013-11-14131118001-0110.256 ppb
2013-11-14131118001-004ND
2013-11-14131118001-005ND
2014-05-12140513061-0050.225 ppb
2014-05-12140513061-0060.257 ppb
2014-05-12140513061-0030.224 ppb
2014-05-12140513061-0020.257 ppb
2014-05-13140513061-0010.246 ppb
2014-05-13140513061-010ND
2014-05-13140513061-0110.256 ppb
2014-05-13140513061-004ND
2014-05-13140513061-0080.224 ppb
2014-05-13140513061-0070.246 ppb
2014-05-13140513061-0120.261 ppb
2014-05-13140513061-0090.253 ppb
2016-12-13I178297ND
2016-12-14I178362ND