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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Hempstead

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

 

55

Samples

0

Samples exceeding legal limit (MCL)

21

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.303 ppm94ND - 1.37 ppm
20150.447 ppm94ND - 2.56 ppm
20160.404 ppm74ND - 1.55 ppm
20170.0158 ppm41ND - 0.0630 ppm
20180.286 ppm128ND - 1.80 ppm
20190.368 ppm148ND - 1.90 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
2014-02-041402305-001-PRIND
2014-07-011407057-001-PRIND
2014-07-241407H51-001-PRIND
2014-11-051411261-003-PRIND
2014-11-051411261-002-PRI0.600 ppm
2014-11-051411261-001-PRI1.37 ppm
2014-11-181411C31-001-PRI0.290 ppm
2014-12-021412141-001-PRIND
2014-12-101412803-001-PRI0.470 ppm
2015-03-041503256-001-PRIND
2015-03-171503B81-001-PRIND
2015-03-171503B81-005-PRIND
2015-03-171503B81-003-PRI2.56 ppm
2015-03-241503G72-001-PRIND
2015-05-271505J26-002-PRI0.170 ppm
2015-05-271505J26-003-PRI0.890 ppm
2015-05-271505J26-001-PRI0.400 ppm
2015-05-271505J26-004-PRIND
2016-03-151603C44-003-PRI1.55 ppm
2016-03-151603C44-004-PRIND
2016-03-151603C44-001-PRI0.670 ppm
2016-03-151603C44-002-PRI0.220 ppm
2016-03-291603N29-001-PRI0.390 ppm
2016-03-291603N29-002-PRIND
2016-05-031605157-001-PRIND
2017-05-097018134004-PRIND
2017-05-097018134003-PRI0.0630 ppm
2017-05-097018134002-PRIND
2017-05-097018134001-PRIND
2018-03-307046726001-PRI0.140 ppm
2018-04-1770486360010.0520 ppm
2018-05-307053116006-PRIND
2018-05-307053116004-PRIND
2018-05-307053116002-PRIND
2018-05-307053116005-PRI0.0820 ppm
2018-05-307053116003-PRI0.180 ppm
2018-06-057053757003-SEC0.700 ppm
2018-06-057053757001-SEC0.410 ppm
2018-06-057053757002-SEC1.80 ppm
2018-06-057053757005-SECND
2018-11-1670713170010.0620 ppm
2019-01-297077827001-PRI1.70 ppm
2019-01-297077827002-PRI0.600 ppm
2019-02-0570784660010.110 ppm
2019-02-0570784660020.330 ppm
2019-03-127082052001-SECND
2019-03-127082052001-PRIND
2019-03-127082052003-SECND
2019-03-127082052002-SECND
2019-03-197082762001-SECND
2019-03-277083593001-SECND
2019-04-167085976004-SEC0.0740 ppm
2019-07-117097222001-PRI1.90 ppm
2019-12-2470116371001-PRI0.1000 ppm
2019-12-2770116632001-PRI0.340 ppm