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EWG's Tap Water Database — 2019 UPDATE

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Nitrite

Seacoast Utilities Authority

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.

 

10

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
20130.0430 ppm220.0380 ppm - 0.0480 ppm
20140.0240 ppm42ND - 0.0550 ppm
20150.0125 ppm21ND - 0.0250 ppm
2016ND10ND
20170.0250 ppm110.0250 ppm

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 Result
2013-08-290.0480 ppm
2013-08-290.0380 ppm
2014-01-29ND
2014-01-29ND
2014-04-220.0550 ppm
2014-04-220.0410 ppm
2015-08-060.0250 ppm
2015-08-06ND
2016-09-14ND
2017-09-190.0250 ppm