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EWG's Tap Water Database — 2019 UPDATE

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Nitrate and nitrite

New Orleans Algiers Water Works

Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.

 

13

Samples

0

Samples exceeding legal limit (MCL)

11

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.000 ppm221.000 ppm
20131.000 ppm221.000 ppm
2014ND20ND
20151.20 ppm221.20 ppm
20161.90 ppm221.90 ppm
20172.30 ppm332.30 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.

EPA Maximum Contaminant
Level (MCL) 10 ppm

ppm = parts per million

All test results

Date Lab ID Result
2012-03-05AD640751.000 ppm
2012-03-05AD640751.000 ppm
2013-01-22AD748151.000 ppm
2013-01-22AD748151.000 ppm
2014-02-04AD88731ND
2014-02-04AD88731ND
2015-03-16351798070011.20 ppm
2015-03-16351798070011.20 ppm
2016-01-27352269990011.90 ppm
2016-01-27352269990011.90 ppm
2017-02-22352968270012.30 ppm
2017-02-22352968270012.30 ppm
2017-06-012.30 ppm*

* Sample result is taken from the system's CCR report.