EWG's Tap Water Database



City of Loveland

Chlorite is a disinfection byproduct resulting from water treatment with chlorine dioxide. Chlorite decreases hemoglobin levels and causes other hematologic effects. Read More.

Chlorite also forms when chlorine dioxide is used as a bleaching agent for textiles, paper pulp, flour and oils, and from the use of chlorine dioxide in food and packaging. In 2009, California published a public health goal of 50 parts per billion for chlorite in drinking water. California state scientists reported that chlorite causes red blood cell damage, affects sperm and thyroid function, and may alter behavior and neurodevelopment of rat pups exposed in the womb.

Click here to read more about disinfection byproducts.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
2011358.3 ppb66270.0 ppb - 440.0 ppb
2013216.4 ppb99142.0 ppb - 250.0 ppb
2015290.0 ppb99160.0 ppb - 400.0 ppb

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 50 ppb

The health guideline of 50 ppb for chlorite was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against change in blood chemistry.

ppb = parts per billion.

EPA Maximum Contaminant
Level (MCL) 1,000 ppb

The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.

ppb = parts per billion.

EPA Maximum Contaminant
Level Goal (MCLG)800 ppb

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppb = parts per billion.

All test results

Date Result
2011-06-22300.0 ppb
2011-06-22320.0 ppb
2011-06-22270.0 ppb
2011-07-12440.0 ppb
2011-07-12420.0 ppb
2011-07-12400.0 ppb
2013-04-22230.0 ppb
2013-04-22210.0 ppb
2013-04-22190.0 ppb
2013-05-09214.0 ppb
2013-05-09212.0 ppb
2013-05-09142.0 ppb
2013-06-03250.0 ppb
2013-06-03250.0 ppb
2013-06-03250.0 ppb
2015-04-14310.0 ppb
2015-04-14210.0 ppb
2015-04-14260.0 ppb
2015-05-12160.0 ppb
2015-05-12250.0 ppb
2015-05-12300.0 ppb
2015-07-07350.0 ppb
2015-07-07400.0 ppb
2015-07-07370.0 ppb