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EWG's Tap Water Database — 2019 UPDATE

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Nitrate and nitrite

Dalton Utilities

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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND20ND
20140.220 ppm220.220 ppm
20150.127 ppm31ND - 0.380 ppm
20160.137 ppm31ND - 0.410 ppm
20170.227 ppm32ND - 0.410 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
2012-10-16AH81928ND
2012-10-16AH81927ND
2013-10-08AI20293ND
2013-10-08AI20292ND
2014-08-12AI492350.220 ppm
2014-08-12AI492340.220 ppm
2015-09-28AI912680.380 ppm
2015-09-28AI91267ND
2015-09-28AI91266ND
2016-10-05AJ306450.410 ppm
2016-10-05AJ30644ND
2016-10-05AJ30643ND
2017-09-13AJ675970.410 ppm
2017-09-13AJ675960.270 ppm
2017-09-13AJ67595ND