EWG's Tap Water Database — 2019 UPDATE



City of Corpus Christi

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
20120.430 ppm110.430 ppm
20130.335 ppm220.320 ppm - 0.350 ppm
20140.240 ppm110.240 ppm
20150.250 ppm110.250 ppm
20160.340 ppm110.340 ppm
20170.414 ppm550.230 ppm - 0.590 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
2012-01-2512016390010.430 ppm
2013-02-13AC103540.350 ppm
2013-06-24AC228600.320 ppm
2014-03-24AC480500.240 ppm
2015-02-17AC807180.250 ppm
2016-02-10AD229190.340 ppm
2017-01-18AD652510.300 ppm
2017-03-21AD759330.590 ppm
2017-05-16AD843180.530 ppm
2017-07-28AD912420.420 ppm
2017-11-14AE046270.230 ppm