Know Your Environment. Protect Your Health.

Nitrate

CTWC - Naugatuck Region-Central System

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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

14

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.904 ppm550.330 ppm - 2.13 ppm
20190.394 ppm220.390 ppm - 0.398 ppm
20200.299 ppm220.298 ppm - 0.300 ppm
20210.532 ppm330.468 ppm - 0.635 ppm
20220.340 ppm110.340 ppm
20230.270 ppm110.270 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

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
2018-01-15BZ72858NOX0.330 ppm
2018-04-10CA17352NOX0.440 ppm
2018-05-21CA50443NOX2.13 ppm
2018-06-11CA67843NOX0.800 ppm
2018-06-11CA67844NOX0.820 ppm
2019-01-16NOX 2005189360.390 ppm
2019-01-29NOX 2005198320.398 ppm
2020-01-13NOX 2005626940.300 ppm
2020-01-13NOX 2005626970.298 ppm
2021-04-06NOX 2006119600.492 ppm
2021-04-06NOX 2006119620.468 ppm
2021-04-06NOX 2006119590.635 ppm
2022-02-14CK666720.340 ppm
2023-01-16CN248280.270 ppm