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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Waldorf

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.

MORE ABOUT THIS CONTAMINANT

 

66

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
2014N/A00N/A
2015ND80ND
2016ND160ND
2017ND140ND
2018ND140ND
2019ND140ND

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
2015-03-24125942_01ND
2015-03-24125939_01ND
2015-03-31126129_01ND
2015-03-31126132_01ND
2015-03-31126133_01ND
2015-03-31126135_01ND
2015-04-09126468_01ND
2015-11-16132838_01ND
2016-03-09135537_01ND
2016-03-22135891_01ND
2016-03-22135891_03ND
2016-03-22135891_04ND
2016-04-04136303_01ND
2016-04-04136305_01ND
2016-05-24E16004449001ND
2016-05-24E16004449002ND
2016-06-01138436_01ND
2016-06-03138515_01ND
2016-06-03138516_01ND
2016-10-20143554_01ND
2016-10-24E17001822001ND
2016-10-24E17001822003ND
2016-10-24E17001822002ND
2016-11-02143949_01ND
2017-01-05145553_01ND
2017-01-09145782-01ND
2017-02-1530159-000001ND
2017-02-1530158-000001ND
2017-03-0103359_000001ND
2017-03-0130358_000001ND
2017-03-0130356_000001ND
2017-03-0130357_000001ND
2017-04-1031004_000001ND
2017-05-0231348_000002ND
2017-05-0231348_000001ND
2017-06-0131885_000001ND
2017-06-0131886_000001ND
2017-11-0834274_000001ND
2018-01-0334993_000001ND
2018-02-0735474_000001ND
2018-02-1335581_000001ND
2018-03-0735869_000004ND
2018-03-0735869_000003ND
2018-03-0735869_000001ND
2018-04-0336238_000001ND
2018-04-1036347_000001ND
2018-06-0537214_000001ND
2018-06-0537215_000001ND
2018-07-192327817001ND
2018-09-042336839001ND
2018-11-082349377001ND
2018-12-193006982001ND
2019-01-163011872001ND
2019-02-143016728001ND
2019-02-143016730001ND
2019-03-063020509001ND
2019-03-063020508001ND
2019-04-033026082001ND
2019-04-103027563001ND
2019-04-103027564001ND
2019-06-053038238001ND
2019-06-13E19004314003ND
2019-07-1519G1191_01ND
2019-08-0619H0960_01ND
2019-10-1519101509-001ND
2019-11-0619110605-001ND