Know Your Environment. Protect Your Health.

Nitrate and nitrite

CTWC - Naugatuck Region-Central 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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

20

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.780 ppm660.158 ppm - 2.13 ppm
20190.398 ppm330.390 ppm - 0.406 ppm
20200.294 ppm330.283 ppm - 0.300 ppm
20210.558 ppm440.468 ppm - 0.635 ppm
20220.320 ppm220.300 ppm - 0.340 ppm
20230.265 ppm220.260 ppm - 0.270 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
2018-01-15BZ72858NOX0.330 ppm
2018-04-10CA17352NOX0.440 ppm
2018-05-21CA50443NOX2.13 ppm
2018-06-11CA67843NOX0.800 ppm
2018-06-11CA67844NOX0.820 ppm
2018-11-14IOCR 2005127360.158 ppm
2019-01-16NOX 2005189360.390 ppm
2019-01-18IOCR 2005191470.406 ppm
2019-01-29NOX 2005198320.398 ppm
2020-01-13NOX 2005626970.298 ppm
2020-01-13IOCR 2005626910.283 ppm
2020-01-13NOX 2005626940.300 ppm
2021-04-06NOX 2006119600.492 ppm
2021-04-06NOX 2006119620.468 ppm
2021-04-06IOCR 2006119590.635 ppm
2021-04-06NOX 2006119590.635 ppm
2022-02-14CK666720.340 ppm
2022-02-14CK666700.300 ppm
2023-01-16CN248280.270 ppm
2023-01-16CN248260.260 ppm