Know Your Environment. Protect Your Health.

Nitrate

Rra Arrowhead Lake Lots

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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.206 ppm110.206 ppm
20190.423 ppm110.423 ppm
20200.344 ppm110.344 ppm
20210.0756 ppm440.0354 ppm - 0.120 ppm
20220.138 ppm440.0166 ppm - 0.244 ppm
20230.215 ppm440.128 ppm - 0.307 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
2018-05-07Q18183160010.206 ppm
2019-01-28Q19039180030.423 ppm
2020-06-09Q20232210050.344 ppm
2021-03-09Q21060520020.0354 ppm
2021-06-08Q21148610030.0675 ppm
2021-09-08Q21246300030.0793 ppm
2021-12-06Q21337930030.120 ppm
2022-03-23Q22094480010.0166 ppm
2022-05-25Q22151530010.244 ppm
2022-08-17Q22243420030.122 ppm
2022-11-09Q22339230010.168 ppm
2023-02-13Q23055010010.128 ppm
2023-05-10Q23179660010.279 ppm
2023-08-21Q23351280020.146 ppm
2023-11-01Q23468610010.307 ppm