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EWG's Tap Water Database — 2019 UPDATE

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Nitrite

City of South Houston

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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.00200 ppm51ND - 0.01000 ppm
2013ND50ND
2014N/A00N/A
20150.0200 ppm550.01000 ppm - 0.0300 ppm
2016N/A00N/A
2017N/A00N/A

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
2012-02-06AB80200ND
2012-02-06AB80197ND
2012-02-06AB80207ND
2012-02-06AB802030.01000 ppm
2012-02-06AB80202ND
2013-01-14AC07536ND
2013-01-14AC07538ND
2013-01-14AC07540ND
2013-01-14AC07531ND
2013-01-14AC07539ND
2015-01-21AC769860.01000 ppm
2015-01-21AC769870.0300 ppm
2015-01-21AC769850.0200 ppm
2015-01-21AC769840.0200 ppm
2015-01-21AC769830.0200 ppm