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EWG's Tap Water Database

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Nitrate and nitrite

Carthage

Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20100.345 ppm220.160 ppm - 0.530 ppm
20110.1000 ppm21ND - 0.200 ppm
20120.390 ppm21ND - 0.780 ppm
20130.415 ppm21ND - 0.830 ppm
20140.360 ppm21ND - 0.720 ppm
20150.180 ppm21ND - 0.360 ppm

ppm = parts per million.

State and national drinking water standards and health guidelines

Health Guideline 5 ppm

The health guideline of 5 ppm for nitrate and nitrite was defined by EWG based on studies by scientists at the National Cancer Institute and other independent researchers. This health guideline protects against cancer and harm to fetal growth and development.

ppm = parts per million.

EPA Maximum Contaminant
Level (MCL) 10 ppm

The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.

ppm = parts per million.

EPA Maximum Contaminant
Level Goal (MCLG)10 ppm

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppm = parts per million.

All test results

Date Lab ID Result
2010-08-16AB310940.530 ppm
2010-08-16AB310950.160 ppm
2011-08-08AB534120.200 ppm
2011-08-08AB53413ND
2012-08-07AB814490.780 ppm
2012-08-07AB81450ND
2013-08-12AC07589ND
2013-08-12AC075880.830 ppm
2014-08-18AC32040ND
2014-08-18AC320410.720 ppm
2015-01-20AC408770.360 ppm
2015-01-20AC40876ND