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EWG's Tap Water Database — 2021 UPDATE

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Nitrite

Makawao

Nitrite, closely related to the fertilizer chemical nitrate, comes from urban runoff and from fertilizer applied to agricultural lands to pollute drinking water. Nitrite is significantly more toxic than nitrate. Excessive nitrite in water can cause oxygen deprivation in infants and increase the risk of cancer.

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90

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND120ND
2015ND130ND
2016ND170ND
2017ND210ND
2018ND160ND
2019ND110ND

ppm = parts per million

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 1 ppm

The legal limit for nitrite, established in 1991, was based on the rate of conversion of ingested nitrate into nitrite in adults. This limit may not fully protect against the risk of cancer due to nitrite exposure.

ppm = parts per million

All test results

Date Lab ID Result
2014-03-17201403190269ND
2014-03-27201032704ND
2014-03-272014032711ND
2014-03-272014032707ND
2014-03-272014032706ND
2014-03-272014032705ND
2014-03-27201032711ND
2014-03-27201032707ND
2014-03-27201032706ND
2014-03-27201032705ND
2014-03-272014032704ND
2014-12-17201412180338ND
2015-01-212015012103ND
2015-01-272015012707ND
2015-01-272015012708ND
2015-01-282015012802ND
2015-01-282015012801ND
2015-02-262015022602ND
2015-02-262015022603ND
2015-04-222015042201ND
2015-05-072015050708ND
2015-06-232015062301ND
2015-10-212015102101ND
2015-11-182015111806ND
2015-12-102015121006ND
2016-01-14ND
2016-03-16ND
2016-03-31ND
2016-03-31ND
2016-03-31ND
2016-03-31ND
2016-04-21ND
2016-04-21ND
2016-05-24ND
2016-06-16ND
2016-07-14ND
2016-08-11ND
2016-09-26ND
2016-10-26ND
2016-11-21ND
2016-11-30ND
2016-12-20ND
2017-01-19ND
2017-02-09ND
2017-03-20ND
2017-03-20ND
2017-04-25ND
2017-05-18ND
2017-05-18ND
2017-06-27ND
2017-06-27ND
2017-07-20ND
2017-08-10ND
2017-09-07ND
2017-09-07ND
2017-09-21ND
2017-10-19ND
2017-10-25ND
2017-10-25ND
2017-10-25ND
2017-10-25ND
2017-11-08ND
2017-12-01ND
2018-01-18201801220012ND
2018-02-01201802050005ND
2018-02-01201802020326ND
2018-02-01201802020127ND
2018-02-01201802020322ND
2018-02-20201801031001ND
2018-03-01201803050156ND
2018-04-02201804030559ND
2018-05-10201805110553ND
2018-06-07201804160017ND
2018-07-19201807210094ND
2018-08-092018080901ND
2018-09-062018090601ND
2018-10-112018101101ND
2018-11-012018110101ND
2018-12-142018121401ND
2019-01-162019011601ND
2019-02-202019022001ND
2019-05-222019052214ND
2019-05-222019052212ND
2019-05-222019052210ND
2019-05-222019052209ND
2019-05-222019052211ND
2019-05-222019052213ND
2019-09-242019092401ND
2019-11-212019112102ND
2019-12-122019121201ND