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EWG's Tap Water Database — 2019 UPDATE

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Nitrate and nitrite

City of Scottsdale

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

21

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.350 ppm110.350 ppm
2013N/A00N/A
20141.11 ppm1311ND - 4.00 ppm
20154.90 ppm114.90 ppm
2016N/A00N/A
20170.978 ppm98ND - 5.00 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
2012-11-202111591-010.350 ppm
2014-02-05AB45662I0.300 ppm
2014-02-05AB45661I1.10 ppm
2014-02-05AB45660I4.00 ppm
2014-02-05AB45659I0.200 ppm
2014-02-11AB45852I0.500 ppm
2014-02-12AB45865I0.800 ppm
2014-02-13AB45913I0.500 ppm
2014-02-13AB45912I0.600 ppm
2014-03-13AB46644I0.900 ppm
2014-06-124061175-013.71 ppm
2014-06-124061176-01ND
2014-08-064080551-02TND
2014-08-27AB50551I1.80 ppm
2015-01-26AB541804.90 ppm
2017-01-23AB72209T1.10 ppm
2017-01-31AB72398T5.00 ppm
2017-01-31AB72396TND
2017-04-11AB742810.500 ppm
2017-04-18AZ744560.500 ppm
2017-05-03AB749540.600 ppm
2017-05-03AB749520.500 ppm
2017-05-11AB752520.300 ppm
2017-05-25AB755600.300 ppm