EWG's Tap Water Database — 2019 UPDATE



Anthony Harbor Subdivision

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
20120.0300 ppm110.0300 ppm
20130.0235 ppm110.0235 ppm
20140.0315 ppm110.0315 ppm
20150.0395 ppm110.0395 ppm
20160.0325 ppm110.0325 ppm
20170.0197 ppm110.0197 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
2012-12-1312126720010.0300 ppm
2013-06-20Q13026200050.0235 ppm
2014-06-26Q14240790020.0315 ppm
2015-06-25Q15240720010.0395 ppm
2016-06-22Q16254200060.0325 ppm
2017-12-13Q17659210040.0197 ppm