Know Your Environment. Protect Your Health.

Nitrate and nitrite

CTWC - Unionville System

Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.

 

22

Samples

0

Samples exceeding legal limit (MCL)

22

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.32 ppm660.460 ppm - 2.40 ppm
20191.77 ppm441.18 ppm - 2.06 ppm
20201.55 ppm330.484 ppm - 2.38 ppm
20211.68 ppm330.778 ppm - 2.30 ppm
20221.42 ppm330.580 ppm - 2.60 ppm
20231.63 ppm330.870 ppm - 2.60 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

ppm = parts per million

All test results

Date Lab ID Result
2018-04-10CA16951NOX1.79 ppm
2018-04-10CA16950NOX1.67 ppm
2018-07-23CA967420.460 ppm
2018-07-23CA967432.40 ppm
2018-11-06NOX 2005119030.702 ppm
2018-11-14IOC1 2005127880.890 ppm
2019-02-05NOX 2005207471.99 ppm
2019-02-05NOX 2005207461.84 ppm
2019-09-17NOX 2005493862.06 ppm
2019-09-17NOX 2005493921.18 ppm
2020-07-07NOX 2005818352.38 ppm
2020-07-07NOX 2005818360.484 ppm
2020-10-19NOX 2005944701.77 ppm
2021-03-02NOX 2006083582.30 ppm
2021-03-02NOX 2006083571.97 ppm
2021-09-22300073532 3000735330.778 ppm
2022-03-14CK867800.580 ppm
2022-03-14CK867791.07 ppm
2022-08-23CM119592.60 ppm
2023-01-24CN291872.60 ppm
2023-01-24CN291861.41 ppm
2023-08-01CO631040.870 ppm