EWG's Tap Water Database — 2019 UPDATE



Attleboro Water Department

Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20120.360 ppm220.300 ppm - 0.420 ppm
20130.370 ppm220.130 ppm - 0.610 ppm
20140.228 ppm440.160 ppm - 0.250 ppm
20150.382 ppm550.170 ppm - 0.510 ppm
20160.158 ppm440.130 ppm - 0.230 ppm
20170.250 ppm440.150 ppm - 0.330 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The EWG Health Guideline of 0.14 ppm for nitrate was defined by EWG . This health guideline protects against cancer and harm to fetal growth and development.

EPA Maximum Contaminant
Level (MCL) 10 ppm

The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.

ppm = parts per million

All test results

Date Result
2012-01-040.420 ppm
2012-01-040.300 ppm
2013-01-020.610 ppm
2013-01-110.130 ppm
2014-01-020.160 ppm
2014-01-020.250 ppm
2014-06-160.250 ppm
2014-06-160.250 ppm
2015-01-070.510 ppm
2015-01-070.510 ppm
2015-03-040.360 ppm
2015-03-040.360 ppm
2015-08-210.170 ppm
2016-01-060.140 ppm
2016-01-060.230 ppm
2016-08-030.130 ppm
2016-08-030.130 ppm
2017-01-040.330 ppm
2017-01-040.330 ppm
2017-03-230.150 ppm
2017-06-270.190 ppm