Know Your Environment. Protect Your Health.

Nitrate

Chalk Hill Special Utility District

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)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0280 ppm440.0268 ppm - 0.0290 ppm
20190.0292 ppm440.0253 ppm - 0.0330 ppm
20200.0321 ppm440.0296 ppm - 0.0346 ppm
20210.0319 ppm440.0309 ppm - 0.0342 ppm
20220.0352 ppm440.0305 ppm - 0.0379 ppm
20230.0326 ppm440.0287 ppm - 0.0355 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
2018-06-20Q18244870130.0284 ppm
2018-06-20Q18244870160.0279 ppm
2018-06-20Q18244870170.0268 ppm
2018-06-20Q18244870030.0290 ppm
2019-01-10Q19014110020.0264 ppm
2019-04-08Q19140000010.0330 ppm
2019-04-08Q19140000100.0322 ppm
2019-04-08Q19140000110.0253 ppm
2020-03-23Q20121830060.0312 ppm
2020-12-17Q20500830140.0346 ppm
2020-12-17Q20500830150.0296 ppm
2020-12-17Q20500830180.0330 ppm
2021-11-09Q21313590070.0342 ppm
2021-11-09Q21313590110.0310 ppm
2021-11-09Q21313590100.0309 ppm
2021-11-09Q21313590090.0313 ppm
2022-12-13Q22372980110.0379 ppm
2022-12-13Q22372980120.0379 ppm
2022-12-13Q22372980130.0305 ppm
2022-12-13Q22372980140.0345 ppm
2023-03-20Q23104650010.0333 ppm
2023-03-20Q23104650060.0329 ppm
2023-05-23Q23194090100.0287 ppm
2023-05-23Q23194090160.0355 ppm