Know Your Environment. Protect Your Health.

Nitrate

Hays County Water Control and Improvement District 1

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.

 

6

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.1000 ppm110.1000 ppm
20190.320 ppm110.320 ppm
20200.180 ppm110.180 ppm
20210.0800 ppm110.0800 ppm
20220.650 ppm110.650 ppm
20230.160 ppm110.160 ppm

ppm = parts per million

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.14 ppm

The EWG health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.

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
2018-01-31AE114160.1000 ppm
2019-08-28AE812470.320 ppm
2020-02-13AE982650.180 ppm
2021-01-13AF390140.0800 ppm
2022-01-12AF798000.650 ppm
2023-02-14AG286710.160 ppm