Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Nitrite

St. Louis City

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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
20130.00825 ppm41ND - 0.0330 ppm
2014ND20ND
2015ND20ND
20160.0362 ppm220.0329 ppm - 0.0395 ppm
20170.0200 ppm220.0200 ppm

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
2012-05-09CRCW050912NO3ND
2012-05-09HBCB050912NO3ND
2013-03-12CRCW031213NO3ND
2013-03-12HBCB031213NO3ND
2013-05-07CRCW050713NO3ND
2013-05-07HBCB050713NO30.0330 ppm
2014-05-20HBCB052014NO3ND
2014-05-20CRCW052014NO3ND
2015-06-11HBCB061115NO3ND
2015-06-11CRCW061115NO3ND
2016-05-10HBCB051016NO30.0395 ppm
2016-05-10CRCW051016NO30.0329 ppm
2017-05-22CRCW052217NO30.0200 ppm
2017-05-22HBCB052217NO30.0200 ppm