Know Your Environment. Protect Your Health.

Nitrate

North Castle Water District #1

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)

12

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.146 ppm110.146 ppm
20190.214 ppm110.214 ppm
20200.0720 ppm42ND - 0.146 ppm
20210.0805 ppm42ND - 0.169 ppm
20220.145 ppm440.116 ppm - 0.172 ppm
20230.165 ppm440.143 ppm - 0.202 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
2018-07-24AU15717-NIT0.146 ppm
2019-08-05AV16472-NIT0.214 ppm
2020-02-26AW03948-NIT0.146 ppm
2020-02-26AW03946-NIT0.142 ppm
2020-07-09AW13032-NITND
2020-07-29AW14502-NITND
2021-03-03AX04228-NITND
2021-03-03AX04222-NITND
2021-07-06AX13093-NIT0.153 ppm
2021-08-04AX15703-NIT0.169 ppm
2022-03-01AY03620-NIT0.116 ppm
2022-03-01AY03614-NIT0.137 ppm
2022-07-06AY11619-NIT0.154 ppm
2022-07-12AY12751-NIT0.172 ppm
2023-03-22AZ05098-NIT0.154 ppm
2023-03-22AZ05100-NIT0.143 ppm
2023-07-10AZ12338-NIT0.161 ppm
2023-07-25AZ13471-NIT0.202 ppm