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EWG's Tap Water Database — 2019 UPDATE

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Nitrate and nitrite

Port Washington Waterworks

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.

 

6

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.330 ppm110.330 ppm
20130.610 ppm110.610 ppm
20140.300 ppm110.300 ppm
20150.300 ppm110.300 ppm
20160.230 ppm110.230 ppm
20170.360 ppm110.360 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
2012-04-252630415-160.330 ppm
2013-04-222812648-490.610 ppm
2014-04-083004182-830.300 ppm
2015-04-073219659-600.300 ppm
2016-05-053443037-380.230 ppm
2017-04-193677792-930.360 ppm