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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

City of Winston-Salem

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

 

136

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND30ND
2015ND30ND
2016ND320ND
2017ND330ND
2018ND290ND
2019ND360ND

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
2014-12-01AA50552ND
2014-12-01AA50553ND
2014-12-01AA50554ND
2015-12-14ND
2015-12-14ND
2015-12-14ND
2016-01-118881-011116-EP1NND
2016-01-118881-011116-EP2NND
2016-01-118881-011116-EP3NND
2016-04-188881-041816-EP1NND
2016-04-188881-041816-EP2NND
2016-04-188881-041816-EP3NND
2016-05-028881-050216-EP1NND
2016-05-028881-050216-EP2NND
2016-05-028881-050216-EP3NND
2016-06-018881-060116-EP1NND
2016-06-018881-060116-EP2NND
2016-06-138881-061316-EP1NND
2016-06-138881-061316-EP2NND
2016-06-138881-061316-EP3NND
2016-07-118881-071116-EP1NND
2016-07-118881-071116-EP2NND
2016-07-118881-071116-EP3NND
2016-08-088881-080816-EP1NND
2016-08-088881-080816-EP2NND
2016-08-088881-080816-EP3NND
2016-09-058881-090516-EP1NND
2016-09-058881-090516-EP2NND
2016-09-058881-090516-EP3NND
2016-10-038881-100316-EP1NND
2016-10-038881-100316-EP2NND
2016-10-038881-100316-EP3NND
2016-11-148881-111416-EP1NND
2016-11-148881-111416-EP2NND
2016-11-148881-111416-EP3NND
2016-12-128881-121216-EP1NND
2016-12-128881-121216-EP2NND
2016-12-128881-121216-EP3NND
2017-01-108881-011017-EP1NND
2017-01-108881-011017-EP2NND
2017-01-108881-011017-EP3NND
2017-02-068881-020617-EP1NND
2017-02-068881-020617-EP2NND
2017-02-068881-020617-EP3NND
2017-03-068881-030617-EP1NND
2017-03-068881-030617-EP2NND
2017-03-068881-030617-EP3NND
2017-04-038881-040317-EP1NND
2017-04-038881-040317-EP2NND
2017-04-038881-040317-EP3NND
2017-05-018881-050117-EP1NND
2017-05-018881-050117-EP2NND
2017-05-018881-050117-EP3NND
2017-06-128881-061217-EP1NND
2017-06-128881-061217-EP2NND
2017-06-128881-061217-EP3NND
2017-07-108881-071017-EP1NND
2017-07-108881-071017-EP2NND
2017-07-108881-071017-EP3NND
2017-08-078881-080717-EP1NND
2017-08-078881-080717-EP2NND
2017-08-078881-080717-EP3NND
2017-09-058881-090517-EP1NND
2017-09-058881-090517-EP2NND
2017-09-058881-090517-EP3NND
2017-10-028881-100217-EP1NND
2017-10-028881-100217-EP2NND
2017-10-028881-100217-EP3NND
2017-12-118881-121117-EP1NND
2017-12-118881-121117-EP2NND
2017-12-118881-121117-EP3NND
2018-03-058881-030518-EP1NND
2018-03-058881-030518-EP2NND
2018-03-058881-030518-EP3NND
2018-04-168881-041618-EP1NND
2018-04-168881-041618-EP2NND
2018-04-168881-041618-EP3NND
2018-05-078881-050718-EP1NND
2018-05-078881-050718-EP2NND
2018-05-078881-050718-EP3NND
2018-06-048881-060418-EP1NND
2018-06-048881-060418-EP2NND
2018-06-048881-060418-EP3NND
2018-07-168881-071618-EP1NND
2018-07-168881-071618-EP2NND
2018-07-168881-071618-EP3NND
2018-08-138881-081318-EP2NND
2018-08-138881-081318-EP3NND
2018-09-248881-092418-EP1NND
2018-09-248881-092418-EP2NND
2018-09-248881-092418-EP3NND
2018-10-228881-102218-EP1NND
2018-10-228881-102218-EP2NND
2018-10-228881-102218-EP3NND
2018-11-198881-111918-EP1NND
2018-11-198881-111918-EP2NND
2018-11-198881-111918-EP3NND
2018-12-118881-121118-EP1NND
2018-12-118881-121118-EP2NND
2018-12-118881-121118-EP3NND
2019-01-228881-012219-EP1NND
2019-01-228881-012219-EP2NND
2019-01-228881-012219-EP3NND
2019-02-048881-020419-EP1NND
2019-02-048881-020419-EP2NND
2019-02-048881-020419-EP3NND
2019-03-048881-030419-EP1NND
2019-03-048881-030419-EP2NND
2019-03-048881-030419-EP3NND
2019-04-018881-040119-EP1NND
2019-04-018881-040119-EP2NND
2019-04-018881-040119-EP3NND
2019-05-068881-050619-EP1NND
2019-05-068881-050619-EP2NND
2019-05-068881-050619-EP3NND
2019-06-038881-060319-EP1NND
2019-06-038881-060319-EP2NND
2019-06-038881-060319-EP3NND
2019-07-018881-070119-EP1NND
2019-07-018881-070119-EP2NND
2019-07-018881-070119-EP3NND
2019-08-268881-082619-EP1NND
2019-08-268881-082619-EP2NND
2019-08-268881-082619-EP3NND
2019-09-238881-092319-EP1NND
2019-09-238881-092319-EP2NND
2019-09-238881-092319-EP3NND
2019-10-078881-100719-EP1NND
2019-10-078881-100719-EP2NND
2019-10-078881-100719-EP3NND
2019-11-048881-110419-EP1NND
2019-11-048881-110419-EP2NND
2019-11-048881-110419-EP3NND
2019-12-028881-120219-EP1NND
2019-12-028881-120219-EP2NND
2019-12-028881-120219-EP3NND