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EWG's Tap Water Database — 2021 UPDATE

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Nitrite

City of Flagstaff

Nitrite, closely related to the fertilizer chemical nitrate, comes from urban runoff and from fertilizer applied to agricultural lands to pollute drinking water. Nitrite is significantly more toxic than nitrate. Excessive nitrite in water can cause oxygen deprivation in infants and increase the risk of cancer.

MORE ABOUT THIS CONTAMINANT

 

32

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND20ND
2015ND70ND
2016ND100ND
2017ND30ND
2018ND100ND
2019N/A00N/A

ppm = parts per million

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 1 ppm

The legal limit for nitrite, established in 1991, was based on the rate of conversion of ingested nitrate into nitrite in adults. This limit may not fully protect against the risk of cancer due to nitrite exposure.

ppm = parts per million

All test results

Date Lab ID Result
2014-05-29201405300314IND
2014-09-042014095050485IND
2015-03-10201503050252IND
2015-04-14201503050251IND
2015-07-09201507100072IND
2015-07-28201507210370IND
2015-07-30201507310184IND
2015-08-27201508280194IND
2015-09-10201509120269IND
2016-02-17201602180314IND
2016-02-17201602180313IND
2016-07-11201607120771IND
2016-07-11201607120775IND
2016-07-11201607120774IND
2016-07-11201607120773IND
2016-07-11201607120772IND
2016-07-25201607260445IND
2016-07-25201607260412IND
2016-08-17201608180220IND
2017-07-05201707061058IND
2017-08-28201708290222IND
2017-08-28201708290221IND
2018-05-15201805160793 IND
2018-05-15201805160792 IND
2018-05-15201805160791 IND
2018-06-11201806120451 IND
2018-06-13201806140903IND
2018-06-13201806140902IND
2018-08-27201808280602IND
2018-08-27201808281003IND
2018-08-27201808281002IND
2018-08-27201808281001IND