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EWG's Tap Water Database — 2021 UPDATE

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Nitrite

Galveston County WCID 1

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.

MORE ABOUT THIS CONTAMINANT

 

34

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.0878 ppm92ND - 0.590 ppm
20150.0113 ppm82ND - 0.0600 ppm
20160.130 ppm42ND - 0.290 ppm
20170.0925 ppm42ND - 0.360 ppm
20180.0560 ppm52ND - 0.220 ppm
20190.215 ppm43ND - 0.460 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 Lab ID Result
2014-01-30AC40821ND
2014-01-30AC40812ND
2014-01-30AC40808ND
2014-01-30AC40815ND
2014-01-30AC40813ND
2014-01-30AC40809ND
2014-06-03AC557470.590 ppm
2014-07-30AC61476ND
2014-10-22AC702530.200 ppm
2015-01-15AC76366ND
2015-01-15AC76367ND
2015-01-15AC76370ND
2015-01-15AC76373ND
2015-01-15AC76371ND
2015-05-06AC906400.0300 ppm
2015-07-07AC98494ND
2015-10-28AD119330.0600 ppm
2016-01-26AD199550.290 ppm
2016-05-16AD367040.230 ppm
2016-09-29AD51801ND
2016-11-29AD59281ND
2017-01-26AD669810.360 ppm
2017-05-18AD84753ND
2017-07-24AD90239ND
2017-10-16AE007070.01000 ppm
2018-02-26AE15221ND
2018-05-21AE26907ND
2018-06-18AE301120.220 ppm
2018-08-28AE38623ND
2018-10-15AE433590.0600 ppm
2019-01-31AE523580.240 ppm
2019-04-22AE630900.460 ppm
2019-07-15AE742920.160 ppm
2019-10-02AE85431ND