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EWG's Tap Water Database — 2019 UPDATE

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Nitrate

City of Rockport

NOTE: City of Rockport purchases water from San Patricio Municipal Water District which is required to test for nitrate. Sample information shown below was taken by San Patricio Municipal Water District.

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

10

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.455 ppm220.453 ppm - 0.456 ppm
20130.365 ppm220.340 ppm - 0.390 ppm
20140.125 ppm220.120 ppm - 0.130 ppm
20150.195 ppm220.190 ppm - 0.200 ppm
20160.285 ppm220.270 ppm - 0.300 ppm
20170.420 ppm220.330 ppm - 0.510 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

NOTE: City of Rockport purchases water from San Patricio Municipal Water District which is required to test for nitrate. Sample information shown below was taken by San Patricio Municipal Water District.

Date Lab ID Result
2012-03-0712032820010.634 ppm
2012-03-0712033310010.440 ppm
2013-06-13AC219640.200 ppm
2013-06-13AC219600.230 ppm
2013-06-13AC219760.200 ppm
2014-04-24AC516300.140 ppm
2014-04-24AC516250.170 ppm
2015-02-25AC818090.190 ppm
2015-09-10AD063930.140 ppm
2016-03-16AD289190.330 ppm
2016-03-16AD289460.340 ppm
2017-03-09AD742350.820 ppm