Menu

EWG's Tap Water Database

Donate

Nitrate and nitrite

Danville City Water Works

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.

 

9

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20100.968 ppm440.1000 ppm - 1.63 ppm
20111.39 ppm440.570 ppm - 2.84 ppm
2012N/A00N/A
2013N/A00N/A
20141.65 ppm111.65 ppm
2015N/A00N/A

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
2010-02-16906785011.63 ppm
2010-04-19907859011.60 ppm
2010-08-02909774010.540 ppm
2010-11-01911514010.1000 ppm
2011-02-08913468012.84 ppm
2011-05-16915362011.22 ppm
2011-08-15917189010.940 ppm
2011-10-03918275010.570 ppm
2014-02-17934847011.65 ppm