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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

City of Ripon

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.

 

25

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20123.70 ppb222.40 ppb - 5.00 ppb
20134.94 ppb14140.710 ppb - 10.8 ppb
2014ND10ND
20151.35 ppb21ND - 2.70 ppb
20165.77 ppb32ND - 12.2 ppb
20177.60 ppb336.00 ppb - 9.00 ppb

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
2012-06-132625-003-07255.00 ppb
2012-06-132625-007-09272.40 ppb
2013-06-262625-010-14254.40 ppb
2013-10-292625-020-09359.60 ppb
2013-11-052625-024-081010.8 ppb
2013-12-18A3L0672-13A3.70 ppb
2013-12-18A3L0672-09A6.40 ppb
2013-12-18A3L0672-05A9.50 ppb
2013-12-18A3L0672-21A2.20 ppb
2013-12-18A3L0672-25A6.40 ppb
2013-12-18A3L0672-27A1.70 ppb
2013-12-18A3L0672-29A6.10 ppb
2013-12-18A3L0672-03A3.50 ppb
2013-12-18A3L0672-01A0.710 ppb
2013-12-18A3L0672-07A2.30 ppb
2013-12-18A3L0672-11A1.80 ppb
2014-06-052625-022-1405ND
2015-01-222625-003-0930ND
2015-06-082625-007-09552.70 ppb
2016-06-152625-010-08205.10 ppb
2016-10-202625-020-104512.2 ppb
2016-11-022625-024-1000ND
2017-06-142625-010-09306.00 ppb
2017-10-242625-020-10207.80 ppb
2017-11-152625-024-09249.00 ppb