EWG's Tap Water Database — 2019 UPDATE



North Texas Municipal Water District - Bonham Water Treatment Plant

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
20120.120 ppm110.120 ppm
20130.201 ppm220.140 ppm - 0.262 ppm
20140.196 ppm220.194 ppm - 0.198 ppm
20150.348 ppm110.348 ppm
20160.350 ppm110.350 ppm
20170.341 ppm110.341 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 Lab ID Result
2012-03-0512031200010.120 ppm
2013-03-0713032670010.140 ppm
2013-06-11Q13021430030.262 ppm
2014-02-04Q14034150020.194 ppm
2014-02-04Q14034150040.198 ppm
2015-05-19Q15184400030.348 ppm
2016-07-27Q16306620050.350 ppm
2017-08-07Q17329750050.341 ppm