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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

Onslow Water And Sewer Authority

Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.

MORE ABOUT THIS CONTAMINANT

 

94

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND150ND
2015ND170ND
2016ND160ND
20170.0762 ppm161ND - 1.22 ppm
2018ND150ND
2019ND150ND

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The EWG Health Guideline of 0.14 ppm for nitrate was defined by EWG . This health guideline protects against cancer and harm to fetal growth and development.

EPA Maximum Contaminant
Level (MCL) 10 ppm

The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.

ppm = parts per million

All test results

Date Lab ID Result
2014-11-1937729_14-35237ND
2014-11-1937729_14-35239ND
2014-11-1937729_14-35240ND
2014-11-1937729_14-35241ND
2014-11-1937729_14-35242ND
2014-11-1937729_14-35245ND
2014-11-1937729_14-35247ND
2014-11-1937729_14-35248ND
2014-11-2037729_14-35378ND
2014-11-2037729_14-35377ND
2014-11-2037729_14-35376ND
2014-11-2037729_14-35375ND
2014-11-2037729_14-35374ND
2014-11-2437729_14-35757ND
2014-12-1737729_14-38239ND
2015-03-16ND
2015-07-25ND
2015-07-27ND
2015-07-27ND
2015-07-27ND
2015-07-27ND
2015-07-27ND
2015-07-27ND
2015-07-28ND
2015-07-28ND
2015-07-28ND
2015-07-28ND
2015-07-28ND
2015-07-28ND
2015-07-28ND
2015-08-03ND
2015-12-15ND
2016-05-2437404_160603_190ND
2016-05-2437404_160603_190ND
2016-05-2437404_160603_190ND
2016-05-2437404_160603_190ND
2016-05-2437404_160603_190ND
2016-05-2437404_160603_190ND
2016-05-2437404_160603_190ND
2016-05-2437404_160603_190ND
2016-05-2537404_160603_190ND
2016-05-2537404_160603_190ND
2016-05-2537404_160603_190ND
2016-05-2537404_160603_190ND
2016-05-2537404_160603_190ND
2016-05-2537404_160603_190ND
2016-05-2537404_160603_190ND
2016-05-2537404_160603_190ND
2017-04-2437404-L171701-04ND
2017-04-2437404-L171701-03ND
2017-04-2437404-L171701-02ND
2017-04-2437404-L171701-011.22 ppm
2017-05-0137404-L171703-02ND
2017-05-0137404-L171703-01ND
2017-05-0837404-L171806-01ND
2017-05-0937404-L171806-02ND
2017-05-1537404-L171904-02ND
2017-05-1537404-L171904-01ND
2017-05-2337404-L172001-01ND
2017-05-2337404-L172001-02ND
2017-05-3037404-L172009-01ND
2017-06-0537404-L172010-02ND
2017-06-0537404-L172010-01ND
2017-07-1737404-L172905-01ND
2018-05-0737404-L181905-01ND
2018-05-0837404-L181908-09ND
2018-05-0837404-L181908-07ND
2018-05-0837404-L181908-06ND
2018-05-0837404-L181908-05ND
2018-05-0837404-L181908-04ND
2018-05-0837404-L181908-03ND
2018-05-0837404-L181908-02ND
2018-05-0837404-L181908-01ND
2018-05-0837404-L181908-08ND
2018-05-0937404-L181916-03ND
2018-05-0937404-L181916-02ND
2018-05-0937404-L181916-01ND
2018-05-1437404-L182003-02ND
2018-05-1437404-L182003-01ND
2019-09-10L193706-01 ND
2019-09-10L193706-06 ND
2019-09-10L193706-05 ND
2019-09-10L193706-03 ND
2019-09-10L193706-02 ND
2019-09-18L193804-02 ND
2019-09-18L193804-01 ND
2019-09-18L193804-03 ND
2019-09-24L193907-03 ND
2019-09-24L193907-02 ND
2019-09-24L193907-01 ND
2019-10-01L194004-02 ND
2019-10-01L194004-03 ND
2019-10-01L194004-01 ND
2019-10-29L194405-01 ND