Know Your Environment. Protect Your Health.

Nitrate

Nocona Hills 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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

10

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.243 ppm220.230 ppm - 0.255 ppm
20190.256 ppm220.227 ppm - 0.285 ppm
20200.183 ppm220.161 ppm - 0.204 ppm
20210.172 ppm220.147 ppm - 0.196 ppm
20220.207 ppm220.174 ppm - 0.240 ppm
20230.0378 ppm21ND - 0.0755 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
2018-12-10Q18508170050.230 ppm
2018-12-10Q18508170140.255 ppm
2019-02-20Q19074880050.285 ppm
2019-02-20Q19074880100.227 ppm
2020-09-21Q20374780070.161 ppm
2020-09-21Q20374780080.204 ppm
2021-06-21Q21160160090.196 ppm
2021-06-21Q21160160150.147 ppm
2022-05-10Q22139170090.240 ppm
2022-05-10Q22139170100.174 ppm
2023-07-05Q2326100003ND
2023-07-05Q23261000040.0755 ppm