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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

Gonzales County Water Supply Corporation

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.

 

52

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.0886 ppm72ND - 0.610 ppm
20150.137 ppm73ND - 0.920 ppm
2016ND70ND
20170.00636 ppm114ND - 0.0200 ppm
20180.446 ppm105ND - 2.04 ppm
20190.392 ppm103ND - 1.46 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
2014-02-20AC43781ND
2014-02-20AC43782ND
2014-02-20AC43756ND
2014-02-20AC437580.01000 ppm
2014-02-20AC43757ND
2014-06-05AC560610.610 ppm
2014-09-05AC65938ND
2015-02-04AC791510.0200 ppm
2015-02-04AC79149ND
2015-02-04AC79150ND
2015-02-04AC79148ND
2015-02-04AC791320.0200 ppm
2015-02-04AC79172ND
2015-07-22AD005390.920 ppm
2016-01-19AD18457ND
2016-01-19AD18458ND
2016-01-19AD18460ND
2016-01-19AD18459ND
2016-01-19AD18478ND
2016-01-19AD18482ND
2016-01-19AD18481ND
2017-03-13AD75339ND
2017-03-13AD753100.0200 ppm
2017-03-13AD75309ND
2017-03-13AD75311ND
2017-03-13AD75338ND
2017-04-26AD810540.0200 ppm
2017-06-09AD869560.0200 ppm
2017-06-09AD86953ND
2017-06-09AD86957ND
2017-07-19AD898450.01000 ppm
2017-10-06AD99666ND
2018-02-08AE128982.04 ppm
2018-02-08AE12914ND
2018-03-12AE177260.0200 ppm
2018-03-12AE17724ND
2018-03-12AE177230.01000 ppm
2018-03-12AE17722ND
2018-05-03AE249231.75 ppm
2018-08-16AE372650.640 ppm
2018-12-12AE48552ND
2018-12-12AE48584ND
2019-01-09AE49125ND
2019-01-09AE49126ND
2019-01-09AE49124ND
2019-01-09AE491271.13 ppm
2019-01-09AE49143ND
2019-01-09AE49142ND
2019-03-05AE57072ND
2019-04-02AE607811.46 ppm
2019-07-12AE742801.33 ppm
2019-10-14AE86406ND