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EWG's Tap Water Database — 2019 UPDATE

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Nitrate and nitrite

Clayton County Water Authority

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)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
20130.105 ppm21ND - 0.210 ppm
20140.1000 ppm21ND - 0.200 ppm
20150.240 ppm21ND - 0.480 ppm
20160.260 ppm21ND - 0.520 ppm
20170.145 ppm21ND - 0.290 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
2012-04-17AH56870ND
2012-04-17AH56869ND
2012-10-22AH82286ND
2013-03-12AH90798ND
2013-03-12AH907960.210 ppm
2014-05-05AI39605ND
2014-05-05AI396030.200 ppm
2015-03-19AI69477ND
2015-03-19AI694760.480 ppm
2016-03-11AJ08069ND
2016-03-11AJ080680.520 ppm
2017-03-06AJ475320.290 ppm
2017-03-06AJ47530ND