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EWG's Tap Water Database — 2019 UPDATE

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Nitrite

Portland Water Bureau

Nitrite, closely related to the fertilizer chemical nitrate, comes from urban runoff and from fertilizer applied to agricultural lands to pollute drinking water. Nitrite is significantly more toxic than nitrate. Excessive nitrite in water can cause oxygen deprivation in infants and increase the risk of cancer.

 

11

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND10ND
2014ND20ND
2015ND20ND
2016ND20ND
2017ND20ND

ppm = parts per million

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 1 ppm

The legal limit for nitrite, established in 1991, was based on the rate of conversion of ingested nitrate into nitrite in adults. This limit may not fully protect against the risk of cancer due to nitrite exposure.

ppm = parts per million

All test results

Date Lab ID Result
2012-01-22BB13243-IND
2012-04-10BB16085-IND
2013-04-09BB26971-IND
2014-04-08BB38036-IND
2014-07-08BB42035-IND
2015-03-31BB49816-IND
2015-06-17BB52444-IND
2016-04-05BB1496-IND
2016-07-27BB71221-IND
2017-02-22BB84114-IND
2017-04-04BB87017-IND