Know Your Environment. Protect Your Health.

Nitrate

Frognot 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.

 

18

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0606 ppm330.0564 ppm - 0.0680 ppm
20190.121 ppm330.0547 ppm - 0.223 ppm
20200.0576 ppm330.0535 ppm - 0.0641 ppm
20210.130 ppm330.0575 ppm - 0.266 ppm
20220.0571 ppm330.0439 ppm - 0.0701 ppm
20230.0727 ppm330.0617 ppm - 0.0803 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
2018-04-19Q18162270090.0680 ppm
2018-04-19Q18162270030.0575 ppm
2018-06-20Q18246900030.0564 ppm
2019-03-18Q19111230010.223 ppm
2019-03-18Q19111230050.0547 ppm
2019-08-12Q19541040050.0853 ppm
2020-03-10Q20092780020.0641 ppm
2020-03-10Q20092780060.0553 ppm
2020-03-10Q20092780070.0535 ppm
2021-07-13Q21182480130.266 ppm
2021-07-13Q21182480210.0575 ppm
2021-07-13Q21182480150.0678 ppm
2022-05-11Q22141870070.0701 ppm
2022-05-11Q22141870080.0573 ppm
2022-05-11Q22141870090.0439 ppm
2023-03-14Q23100030010.0617 ppm
2023-03-14Q23100030130.0803 ppm
2023-03-14Q23100030140.0761 ppm