EWG's Tap Water Database — 2019 UPDATE



City of Alexandria

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.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20120.000952 ppm423ND - 0.0200 ppm
20130.00132 ppm385ND - 0.01000 ppm
20140.00118 ppm344ND - 0.01000 ppm
20150.00250 ppm246ND - 0.01000 ppm
20160.00600 ppm3010ND - 0.0200 ppm
20170.00208 ppm486ND - 0.0200 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