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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Port Washington WD

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

 

178

Samples

0

Samples exceeding legal limit (MCL)

169

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20143.70 ppm880.430 ppm - 5.64 ppm
20154.09 ppm880.510 ppm - 5.92 ppm
20163.92 ppm21210.00222 ppm - 5.84 ppm
20174.03 ppm4847ND - 7.20 ppm
20183.78 ppm4644ND - 6.00 ppm
20193.86 ppm4745ND - 6.40 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
2014-04-071404520-003-PRI4.02 ppm
2014-04-071404520-008-PRI3.85 ppm
2014-04-071404520-001-PRI4.16 ppm
2014-04-071404520-005-PRI0.430 ppm
2014-04-071404520-006-PRI5.64 ppm
2014-04-141404A14-008-PRI4.60 ppm
2014-04-141404A14-004-PRI3.70 ppm
2014-04-141404A14-007-PRI3.17 ppm
2015-04-061504353-006-PRI5.81 ppm
2015-04-061504351-002-PRI3.86 ppm
2015-04-061504351-003-PRI5.92 ppm
2015-04-061504351-001-PRI4.49 ppm
2015-04-131504912-001-PRI0.510 ppm
2015-04-131504912-006-PRI3.58 ppm
2015-04-131504912-005-PRI4.21 ppm
2015-04-221504H15-002-PRI4.31 ppm
2016-04-041604285-002-POCS3.96 ppm
2016-04-041604282-002-PRI5.84 ppm
2016-04-041604281-002-PRI3.30 ppm
2016-04-041604285-002-PRI3.96 ppm
2016-04-111604997-002-PRI3.91 ppm
2016-04-111604990-002-PRI4.87 ppm
2016-05-021605104-001-PRI3.93 ppm
2016-05-021605093-002-PRI0.460 ppm
2016-05-091605753-001-PRI5.44 ppm
2016-05-231605L28-001-PRI0.00222 ppm
2016-10-03701055015-POCS3.70 ppm
2016-10-037010550173.70 ppm
2016-10-037010550184.40 ppm
2016-10-12701870001-POCS5.20 ppm
2016-10-12701866001-POCS3.30 ppm
2016-11-077039120035.00 ppm
2016-11-077039120024.90 ppm
2016-11-14704466002-POCS1.60 ppm
2016-11-14704466003-POCS5.20 ppm
2016-12-057060160024.80 ppm
2016-12-05706016001-POCS4.90 ppm
2017-01-097086140055.50 ppm
2017-01-097086140045.40 ppm
2017-01-17709252008-POCS2.90 ppm
2017-01-307010124001-POCS5.40 ppm
2017-02-067010655006-POCS2.00 ppm
2017-02-067010655007-POCS0.400 ppm
2017-02-1370111870034.30 ppm
2017-02-13701183001-POCS5.20 ppm
2017-02-1370111870025.20 ppm
2017-03-0670127120074.20 ppm
2017-03-0670127120084.60 ppm
2017-04-037014743005-PRI3.50 ppm
2017-04-037014743006-PRI5.60 ppm
2017-04-0370147430084.60 ppm
2017-04-0370147430095.20 ppm
2017-04-037014743004-PRI5.20 ppm
2017-04-107015386002-PRI4.30 ppm
2017-04-137015766001-PRI3.70 ppm
2017-05-017017344002-PRI6.20 ppm
2017-05-017017344001-PRI4.80 ppm
2017-05-087018068001-PRI0.380 ppm
2017-05-087018068002-PRI0.00190 ppm
2017-05-3070198270025.60 ppm
2017-05-3070198270034.40 ppm
2017-06-1270211040094.80 ppm
2017-06-1270211040083.50 ppm
2017-07-0370230760053.20 ppm
2017-07-0370230760043.80 ppm
2017-07-1029122674.70 ppm
2017-07-107023605005-POCS5.00 ppm
2017-07-1070236050084.90 ppm
2017-08-0770264150034.90 ppm
2017-08-0770264150027.20 ppm
2017-08-077026415005ND
2017-08-0770264150060.260 ppm
2017-08-0770264150045.30 ppm
2017-09-0570288370033.80 ppm
2017-10-0270315750013.80 ppm
2017-10-1070324100023.40 ppm
2017-10-107034000035.20 ppm
2017-10-1070324000025.40 ppm
2017-11-0670349460025.40 ppm
2017-11-0670349460034.70 ppm
2017-11-1370355760011.60 ppm
2017-11-1370355740014.90 ppm
2017-11-1370355770010.260 ppm
2017-12-0470370890034.40 ppm
2017-12-0470370890024.30 ppm
2018-01-0870397950015.50 ppm
2018-01-1670405180024.50 ppm
2018-01-1670405180034.70 ppm
2018-02-0570420060010.230 ppm
2018-02-0570420030014.70 ppm
2018-02-0570420050011.40 ppm
2018-02-1270426620024.70 ppm
2018-02-1270426620035.00 ppm
2018-03-1270450620023.70 ppm
2018-03-1270450620034.20 ppm
2018-04-0370469470023.10 ppm
2018-04-037046952001-PRI4.70 ppm
2018-04-0970477170024.80 ppm
2018-04-0970477170035.40 ppm
2018-04-097047715003-PRI5.10 ppm
2018-04-177048617002-PRI5.40 ppm
2018-05-0170500680015.00 ppm
2018-05-017050071001-SEC3.80 ppm
2018-05-0770507210023.70 ppm
2018-05-0770507170010.260 ppm
2018-05-0770507210034.30 ppm
2018-05-0770507190011.70 ppm
2018-06-0570536980035.10 ppm
2018-06-0570536980024.70 ppm
2018-07-0270568830025.40 ppm
2018-07-0270568830035.20 ppm
2018-07-1070575620010.00510 ppm
2018-08-1470614750076.00 ppm
2018-08-1470614750035.20 ppm
2018-08-147061475002-NITND
2018-08-147061475003-NITND
2018-08-1470614750024.90 ppm
2018-09-1070641990035.10 ppm
2018-09-1070641990025.80 ppm
2018-10-0170663930112.70 ppm
2018-10-0970672960125.20 ppm
2018-10-0970672960103.60 ppm
2018-10-1570680080034.20 ppm
2018-10-1570680080024.00 ppm
2018-11-0570700530013.60 ppm
2018-11-1470710640013.70 ppm
2018-11-1470710540010.190 ppm
2018-11-1470710590011.20 ppm
2018-11-1470710640023.50 ppm
2018-12-1770741630074.30 ppm
2018-12-1770741630084.60 ppm
2019-01-0770757600025.80 ppm
2019-01-1470764920045.00 ppm
2019-01-1470764940023.20 ppm
2019-01-1470764940034.10 ppm
2019-02-047078267001ND
2019-02-0470782670035.20 ppm
2019-02-0470782680024.20 ppm
2019-02-0470782670020.260 ppm
2019-02-0470782680036.20 ppm
2019-04-117085526009-SEC5.20 ppm
2019-04-117085526005-SEC3.70 ppm
2019-04-1270857030035.00 ppm
2019-04-1270857030024.40 ppm
2019-04-127085694008-SEC4.10 ppm
2019-04-257087268001-SECND
2019-05-177089996001-PRI5.40 ppm
2019-05-207090159001-PRI4.30 ppm
2019-05-2270905040034.10 ppm
2019-05-227090503001-PRI1.60 ppm
2019-05-2270905040024.20 ppm
2019-05-227090503002-PRI0.310 ppm
2019-06-1270933000033.90 ppm
2019-06-1270933000025.40 ppm
2019-07-1570975140033.70 ppm
2019-07-1570975170034.10 ppm
2019-07-1570975170024.90 ppm
2019-07-2270984510052.80 ppm
2019-07-2970992490026.30 ppm
2019-08-0570999440025.00 ppm
2019-08-0570999440033.70 ppm
2019-08-12701009310025.70 ppm
2019-08-20701020570011.60 ppm
2019-08-20701020570020.310 ppm
2019-09-09701042100024.60 ppm
2019-09-09701042100035.00 ppm
2019-10-16701086370072.80 ppm
2019-10-16701086360026.40 ppm
2019-10-16701086360035.00 ppm
2019-10-21701091790026.20 ppm
2019-10-25701097630035.40 ppm
2019-11-04701105570014.70 ppm
2019-11-04701105670011.50 ppm
2019-11-04701105670020.120 ppm
2019-11-12701115540054.40 ppm
2019-11-12701115540064.50 ppm
2019-12-23701163270032.40 ppm
2019-12-23701163270024.60 ppm