Know Your Environment. Protect Your Health.

Nitrate

Westbound Water Supply Corporation Cisco Source

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

17

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.686 ppm440.145 ppm - 1.36 ppm
20190.678 ppm440.0919 ppm - 1.40 ppm
20200.580 ppm440.0892 ppm - 1.42 ppm
20210.717 ppm440.107 ppm - 1.45 ppm
20220.494 ppm440.137 ppm - 1.42 ppm
20230.566 ppm440.0161 ppm - 1.41 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
2018-11-28Q18483120061.36 ppm
2018-11-28Q18483120070.305 ppm
2018-11-28Q18483120080.932 ppm
2018-11-28Q18483120050.145 ppm
2019-12-17Q19803570011.40 ppm
2019-12-17Q19803570020.172 ppm
2019-12-17Q19803570031.05 ppm
2019-12-17Q19803570090.0919 ppm
2020-06-04Q20223590070.674 ppm
2020-11-09Q20436310121.42 ppm
2020-11-09Q20436310150.0892 ppm
2020-11-09Q20436310160.136 ppm
2021-02-09Q21038630050.107 ppm
2021-02-09Q21038630081.05 ppm
2021-02-09Q21038630070.262 ppm
2021-02-09Q21038630061.45 ppm
2022-02-16Q22057650060.137 ppm
2022-02-16Q22057650071.42 ppm
2022-02-16Q22057650080.280 ppm
2022-02-16Q22057650090.140 ppm
2023-02-07Q23046710010.683 ppm
2023-07-12Q23273470071.41 ppm
2023-07-12Q23273470100.0161 ppm
2023-07-12Q23273470110.153 ppm