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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

City of San Angelo

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.

MORE ABOUT THIS CONTAMINANT

 

23

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.0606 ppm182ND - 0.630 ppm
20150.470 ppm110.470 ppm
20160.470 ppm110.470 ppm
20170.572 ppm110.572 ppm
20180.436 ppm110.436 ppm
20190.522 ppm110.522 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
2014-02-25AC443870.460 ppm
2014-04-29AC51955ND
2014-04-29AC51960ND
2014-04-29AC51961ND
2014-04-29AC51962ND
2014-04-29AC51968ND
2014-04-29AC51965ND
2014-04-29AC51966ND
2014-04-29AC51967ND
2014-04-29AC51964ND
2014-04-29AC51954ND
2014-04-29AC51953ND
2014-04-29AC51951ND
2014-04-29AC51949ND
2014-04-29AC51952ND
2014-04-29AC51948ND
2014-04-29AC51956ND
2014-07-30AC614730.630 ppm
2015-02-02AC793930.470 ppm
2016-02-17AD241650.470 ppm
2017-05-09Q17190850050.572 ppm
2018-02-28Q18086870100.436 ppm
2019-05-07Q19207850060.522 ppm